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US20060246523A1 - Antibody conjugates - Google Patents

Antibody conjugates Download PDF

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Publication number
US20060246523A1
US20060246523A1 US11/413,418 US41341806A US2006246523A1 US 20060246523 A1 US20060246523 A1 US 20060246523A1 US 41341806 A US41341806 A US 41341806A US 2006246523 A1 US2006246523 A1 US 2006246523A1
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Prior art keywords
antibody
conjugate
signal
generating moiety
linker
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US11/413,418
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English (en)
Inventor
Christopher Bieniarz
Jennifer Wong
Mark Lefever
Jerome Kosmeder
Julia Ashworth-Sharpe
Casey Kernag
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Ventana Medical Systems Inc
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Ventana Medical Systems Inc
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Priority to US11/413,418 priority Critical patent/US20060246523A1/en
Assigned to VENTANA MEDICAL SYSTEMS, INC. reassignment VENTANA MEDICAL SYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WONG, JENNIFER, BIENIARZ, CHRISTOPHER, LEFEVER, MARK, ASHWORTH-SHARPE, JULIA, KERNAG, CASEY A., KOSMEDER, JEROME W.
Publication of US20060246523A1 publication Critical patent/US20060246523A1/en
Priority to US12/381,638 priority patent/US8658389B2/en
Priority to US14/146,389 priority patent/US9315789B2/en
Priority to US15/064,792 priority patent/US11359185B2/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
    • A61K47/65—Peptidic linkers, binders or spacers, e.g. peptidic enzyme-labile linkers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
    • A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
    • A61K47/6811—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being a protein or peptide, e.g. transferrin or bleomycin
    • A61K47/6815—Enzymes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/42—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/44—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material not provided for elsewhere, e.g. haptens, metals, DNA, RNA, amino acids
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/0004—Oxidoreductases (1.)
    • C12N9/0065—Oxidoreductases (1.) acting on hydrogen peroxide as acceptor (1.11)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/96—Stabilising an enzyme by forming an adduct or a composition; Forming enzyme conjugates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/531—Production of immunochemical test materials
    • G01N33/532—Production of labelled immunochemicals
    • G01N33/535—Production of labelled immunochemicals with enzyme label or co-enzymes, co-factors, enzyme inhibitors or enzyme substrates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding

Definitions

  • the present invention relates to reagents and methods for detecting a molecule of interest in a biological sample. More particularly, the present invention relates to antibody conjugates and methods for using such conjugates to detect a molecule of interest in a biological sample such as a tissue section.
  • Covalent conjugates of antibodies and signal-generating moieties can be used in immunoassays for detecting specific target molecules in biological samples.
  • the antibody portion of such conjugates specifically binds to a target in the sample and the signal-generating moiety is utilized to provide a detectable signal that indicates the presence/and or location of the target.
  • One type of conjugate that has become widely used, especially for immunohistochemical analysis, is a conjugate of an antibody and an enzyme (antibody-enzyme conjugate).
  • a detectable signal is generated by adding a substrate to the sample and the enzyme portion of the conjugate converts the substrate to, for example, a colored, fluorescent or luminescent product at the site where the antibody portion is bound to its target.
  • Antibody-enzyme conjugates are typically prepared using polyfunctional (typically bifunctional) coupling reagents that are characterized by having at least two reactive groups, one of which is reacted with a functional group on the antibody and the other of which is reacted with a functional group on the enzyme.
  • polyfunctional (typically bifunctional) coupling reagents that are characterized by having at least two reactive groups, one of which is reacted with a functional group on the antibody and the other of which is reacted with a functional group on the enzyme.
  • coupling can lead to inactivation of either or both of the antibody and the enzyme due to steric effects or because the coupling reagents react with functional groups located on portions of the enzyme or antibody that are critical for their function or specificity.
  • An approach to minimizing loss of antibody specificity and enzyme activity is to use a coupling scheme that is specific to particular amino acid residues on either or both of the antibody and the enzyme that are not associated with their functions.
  • This approach is exemplified by the method for Fc-specific conjugation as described in U.S. Pat. No. 5,191,066, which is incorporated by reference herein.
  • sulfhydryl groups thiol groups
  • thiol groups are introduced specifically to a glycosylated region of the Fc portion of an antibody and used along with a linker molecule to covalently attach an enzyme to the antibody. Since the Fc portion is not involved with the specific binding properties of the antibody, such conjugates retain greater specificity, which increases the detectable signal for a particular target molecule of interest and lowers background due to non-specific binding.
  • site specific conjugation can be used to help minimize loss of antibody specificity and enzyme activity due to loss of critical functional groups, such methods do not address loss of antibody specificity and enzyme activity that arise from steric effects such as those steric effects due to aggregation of multiple conjugates and from interactions between the antibody and the enzyme(s) in a conjugate. Detrimental steric effects also can arise due to unintended cross-linking between multiple enzymes, antibodies and/or conjugates, which occurs during preparation of a conjugate composition.
  • heterobifunctional polyethylene glycol linkers are known, but there are no known attempts to use them as coupling reagents for forming antibody-enzyme conjugates. Rather, as disclosed in Chen et al. (Chen et al., “The use of bifunctional polyethylene glycol derivatives for coupling of proteins to and cross-linking of collagen matrices,” J. Mater. Sci. Mater. Med., 13: 1029-1035, 2002), such agents have been utilized to prepare degradable matrices to which active proteins are linked for the purposes of tissue engineering.
  • antibody/signal-generating conjugate composition that overcomes at least the described limitations of prior approaches.
  • antibody conjugates of enzyme (and methods of making the same) that are smaller and yet retain the high signal generating capacity of larger scaffolded conjugates are desirable.
  • Antibody conjugates with signal generating moieties are disclosed, as are methods for making and using the conjugates.
  • the disclosed antibody conjugates exhibit superior performance for detection of molecules of interest in biological samples, especially for detection of such molecules in tissue sections and cytology samples.
  • disclosed antibody-enzyme conjugates retain high amounts of antibody specificity and enzymatic activity, and thereby provide more intense staining with less background than conjugates currently used for detection of antigens in biological samples.
  • a conjugate in one aspect, includes an antibody covalently linked to a signal-generating moiety through a heterobifunctional polyalkyleneglycol linker such as a heterobifunctional polyethyleneglycol (PEG) linker.
  • a disclosed conjugate includes an antibody and a signal-generating moiety covalently linked by a heterobifunctional PEG linker that includes a combination of two different reactive groups selected from a carbonyl-reactive group, an amine-reactive group, a thiol-reactive group and a photo-reactive group.
  • the PEG linker includes a combination of a thiol reactive group and an amine-reactive group or a combination of a carbonyl-reactive group and an thiol-reactive group.
  • the thiol reactive group includes a maleimide group
  • the amine reactive group includes an active ester
  • the carbonyl-reactive group includes a hydrazine derivative.
  • Ab is an antibody
  • SM is a signal-generating moiety
  • the hydrazide group of the PEG linker is bonded to the carbon of an aldehyde group formed in the glycosylated portion of the antibody by oxidation.
  • a method of making an antibody conjugate includes forming a thiolated antibody from an antibody; reacting a signal-generating moiety having an amine group with a PEG maleimide/active ester bifunctional linker to form an activated signal-generating moiety; and reacting the thiolated antibody with the activated signal-generating moiety to form the conjugate of the antibody and the signal-generating moiety.
  • the thiolated antibody can be formed by reduction of intrinsic cystine bridges of the antibody with a reductant or can be formed by reacting the antibody with a reagent that introduces a thiol to the antibody.
  • a method for making a disclosed antibody conjugate includes reacting an antibody with an oxidant to form an aldehyde-bearing antibody; reacting the aldehyde-bearing antibody with a PEG maleimide/hydrazide bifunctional linker to form a thiol-reactive antibody; and reacting the thiol-reactive antibody with a thiolated signal-generating moiety to form the antibody-signal-generating moiety conjugate.
  • reacting the antibody with an oxidant to form the aldehyde-bearing antibody includes oxidizing (such as with periodate, bromine or iodine) a glycosylated region of the antibody to form the aldehyde-bearing antibody.
  • PEG maleimide/hydrazide bifunctional linkers are disclosed that can be used in the disclosed methods to provide disclosed conjugates.
  • methods are disclosed for detecting molecules in biological samples using disclosed conjugates.
  • FIG. 1 is series of images of tissue sections immunohistochemically stained for Ki67 with a disclosed conjugate, in comparison to a scaffolded conjugate, both before and after storage at 45° C. for 7 days.
  • FIG. 2 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of bcl-2.
  • FIG. 3 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of CD15.
  • FIG. 4 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of CD20.
  • FIG. 5 is a series of images comparing the staining intensity of a disclosed conjugate and two scaffolded conjugates for immunohistochemical staining of CD23.
  • FIG. 6 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of CD57.
  • FIG. 7 is a series of images comparing the staining intensity of a disclosed conjugate and two scaffolded conjugates for immunohistochemical staining of cerbB2.
  • FIG. 8 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of cyclin D1.
  • FIG. 9 is a series of images comparing the staining intensity of a disclosed conjugate and two scaffolded conjugates for immunohistochemical staining of EGFR.
  • FIG. 10 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of ER.
  • FIG. 11 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of p53.
  • FIG. 12 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of PR.
  • FIG. 13 is a pair of images comparing the staining intensity of a disclosed conjugate and a scaffolded conjugate for immunohistochemical staining of PSA.
  • FIG. 14 is diagram outlining a scheme for enzyme metallographic detection of binding of a hapten-labeled nucleic acid probe to a target nucleic acid sequence that utilizes a disclosed antibody-enzyme conjugate.
  • FIG. 15 is a series of images of tissue sections treated for enzyme metallographic ISH detection of a nucleic acid sequence using a disclosed conjugate and a scaffolded conjugate, before and after storage both at 37° C. for 7 days and at 45° C. for 7 days.
  • FIG. 16 is a pair of graphs comparing the stability of a disclosed conjugate and a scaffolded conjugate in an enzyme metallographic detection scheme.
  • FIG. 17 is size-exclusion chromatogram comparing the effect of variations of antibody reduction time on the MW profile of a disclosed conjugate.
  • FIG. 18 is a size-exclusion chromatogram comparing the effect of variations of linker size and type on the MW profile of disclosed conjugates.
  • FIG. 19 is a series of images comparing the staining intensity of several disclosed conjugates compared to a conjugate prepared with an extended-length non-PEG linker.
  • FIG. 20 is a size-exclusion chromatogram comparing the effect of variations of linker excess on the MW profile of a disclosed conjugate.
  • FIG. 21 is a size-exclusion chromatogram comparing the effect of variations of horseradish peroxidase concentrations on the MW profile of a disclosed conjugate.
  • FIG. 22 is a size-exclusion chromatogram comparing the effect of variations of the ratio of antibody to horseradish peroxidase on the MW profile of a disclosed conjugate.
  • antibody collectively refers to immunoglobulins or immunoglobulin-like molecules (including IgA, IgD, IgE, IgG and IgM, combinations thereof, and similar molecules produced during an immune response in any vertebrate, for example, in mammals such as humans, goats, rats, rabbits and mice) and antibody fragments that specifically bind to a molecule of interest (or a group of highly similar molecules of interest) to the substantial exclusion of binding to other molecules (for example, antibodies and antibody fragments that have a binding constant for the molecule of interest that is at least 10 3 M ⁇ 1 greater, 10 4 M ⁇ 1 greater or 10 5 M ⁇ 1 greater than a binding constant for other molecules in a biological sample).
  • Antibody fragments include proteolytic antibody fragments [such as F(ab′) 2 fragments, Fab′ fragments, Fab′-SH fragments and Fab fragments as are known in the art], recombinant antibody fragments (such as sFv fragments, dsFv fragments, bispecific sFv fragments, bispecific dsFv fragments, diabodies, and triabodies as are known in the art), and camelid antibodies (see, for example, U.S. Pat. Nos. 6,015,695; 6,005,079; 5,874,541; 5,840,526; 5,800,988; and 5,759,808).
  • proteolytic antibody fragments such as F(ab′) 2 fragments, Fab′ fragments, Fab′-SH fragments and Fab fragments as are known in the art
  • recombinant antibody fragments such as sFv fragments, dsFv fragments, bispecific sFv fragments, bispecific dsFv fragments
  • molecule of interest refers to a molecule for which the presence, location and/or concentration is to be determined.
  • molecules of interest include proteins and nucleic acid sequences labeled with haptens.
  • an antibody/signal-generating moiety conjugate includes an antibody covalently linked to a signal-generating moiety through a heterobifunctional polyalkyleneglycol linker having the general structure shown below: wherein A and B include different reactive groups, x is an integer from 2 to 10 (such as 2, 3 or 4), and y is an integer from 1 to 50, for example, from 2 to 30 such as from 3 to 20 or from 4 to 12.
  • One or more hydrogen atoms can be substituted for additional functional groups such as hydroxyl groups, alkoxy groups (such as methoxy and ethoxy), halogen atoms (F, Cl, Br, I), sulfato groups and amino groups (including mono- and di-substituted amino groups such as dialkyl amino groups).
  • additional functional groups such as hydroxyl groups, alkoxy groups (such as methoxy and ethoxy), halogen atoms (F, Cl, Br, I), sulfato groups and amino groups (including mono- and di-substituted amino groups such as dialkyl amino groups).
  • a and B of the linker can independently include a carbonyl-reactive group, an amine-reactive group, a thiol-reactive group or a photo-reactive group, but are not the same.
  • carbonyl-reactive groups include aldehyde- and ketone-reactive groups like hydrazine derivatives and amines.
  • amine-reactive groups include active esters such as NHS or sulfo-NHS, isothiocyanates, isocyanates, acyl azides, sulfonyl chlorides, aldehydes, glyoxals, epoxides, oxiranes, carbonates, aryl halides, imidoesters, anhydrides and the like.
  • thiol-reactive groups include non-polymerizable Michael acceptors, haloacetyl groups (such as iodoacetyl), alkyl halides, maleimides, aziridines, acryloyl groups, vinyl sulfones, benzoquinones, aromatic groups that can undergo nucleophilic substitution such as fluorobenzene groups (such as tetra and pentafluorobenzene groups), and disulfide groups such as pyridyl disulfide groups and thiols activated with Ellman's reagent.
  • photo-reactive groups include aryl azide and halogenated aryl azides.
  • thiol-reactive group is other than vinyl sulfone.
  • a thiol-reactive group of the heterobifunctional linker is covalently linked to the antibody and an amine-reactive group of the heterobifunctional linker is covalently linked to the signal-generating moiety, or vice versa.
  • a thiol-reactive group of the heterobifunctional linker can be covalently linked to a cysteine residue (such as formed by reduction of a cystine bridge) of the antibody or a thiol-reactive group of the heterobifunctional linker can be covalently linked to a thiol group that is introduced to the antibody, and the amine-reactive group is covalently linked to the signal-generating moiety.
  • an aldehyde-reactive group of the heterobifunctional linker can be covalently linked to the antibody and an amine-reactive group of the heterobifunctional linker can be covalently linked to the signal-generating moiety, or vice versa.
  • an aldehyde-reactive group of the heterobifunctional linker can be covalently linked to an aldehyde formed on a glycosylated portion of an antibody, and the amine-reactive group is covalently linked to the signal-generating moiety.
  • an aldehyde-reactive group of the heterobifunctional linker is covalently linked to the antibody and a thiol-reactive group of the heterobifunctional linker is covalently linked to the signal-generating moiety, or vice versa.
  • signal-generating moieties include enzymes (such as horseradish peroxidase, alkaline phosphatase, acid phosphatase, glucose oxidase, ⁇ -galactosidase, ⁇ -glucuronidase or ⁇ -lactamase), fluorescent molecules (such as fluoresceins, coumarins, BODIPY dyes, resorufins, and rhodamines; additional examples can be found in The Handbook—A Guide to Fluorescent Probes and Labeling Technologies , Invitrogen Corporation, Eugene, Oreg.), detectable constructs (such as fluorescent constructs like quantum dots, which can be obtained, for example, from Invitrogen Corporation, Eugene, Oreg.; see, for example, U.S.
  • enzymes such as horseradish peroxidase, alkaline phosphatase, acid phosphatase, glucose oxidase, ⁇ -galactosidase, ⁇ -glucuronidase or
  • metal chelates such as DOTA and DPTA chelates of radioactive or paramagnetic metal ions like Gd 3+
  • liposomes such as liposomes sequestering fluorescent molecules
  • the signal-generating moiety includes an enzyme
  • a chromagenic compound, fluorogenic compound, or luminogenic compound is used in combination with the enzyme to generate a detectable signal (A wide variety of such compounds are available, for example, from Molecular Probes, Inc., Eugene Oreg.).
  • chromogenic compounds include di-aminobenzidine (DAB), 4-nitrophenylphospate (pNPP), fast red, bromochloroindolyl phosphate (BCIP), nitro blue tetrazolium (NBT), BCIP/NBT, fast red, AP Orange, AP blue, tetramethylbenzidine (TMB), 2,2′-azino-di-[3-ethylbenzothiazoline sulphonate] (ABTS), o-dianisidine, 4-chloronaphthol (4-CN), nitrophenyl- ⁇ -D-galactopyranoside (ONPG), o-phenylenediamine (OPD), 5-bromo-4-chloro-3-indolyl- ⁇ -galactopyranoside (X-Gal), methylumbelliferyl- ⁇ -D-galactopyranoside (MU-Gal), p-nitorphenyl- ⁇ -D-galacto
  • the heterobifunctional linker of the conjugate has the formula: wherein A and B include different reactive groups as before, x and y are as before, and X and Y are spacer groups, for example, spacer groups having between 1 and 10 carbons such as between 1 and 6 carbons or between 1 and 4 carbons, and optionally containing one or more amide linkages, ether linkages, ester linkages and the like.
  • Spacers X and Y can be the same or different, and can be straight-chained, branched or cyclic (for example, aliphatic or aromatic cyclic structures), and can be unsubstituted or substituted.
  • Functional groups that can be substituents on a spacer include carbonyl groups, hydroxyl groups, halogen (F, Cl, Br and I) atoms, alkoxy groups (such as methoxy and ethoxy), nitro groups, and sulfato groups.
  • a carbonyl of a succinimide group of this linker is covalently linked to an amine group on the signal-generating moiety and a maleimide group of the linker is covalently linked to a thiol group of the antibody, or vice versa.
  • an average of between about 1 and about 10 signal moieties are covalently linked to an antibody.
  • a hydrazide group of the linker is covalently linked to a aldehyde group of the antibody and a maleimide group of the linker is covalently linked to a thiol group of the signal-generating moiety, or vice versa.
  • the aldehyde group of the antibody is an aldehyde group formed in an Fc portion of the antibody by oxidation of a glycosylated region of the Fc portion of the antibody.
  • an average of between about 1 and about 10 signal-generating moieties are covalently linked to the antibody, such signal-generating moieties including enzymes, quantum dots and liposomes.
  • the antibody used in the disclosed conjugates can specifically bind any particular molecule or particular group of highly similar molecules
  • the antibody comprises an anti-hapten antibody (which can be used to detect a hapten-labeled probe sequence directed to a nucleic acid sequence of interest) or an antibody the specifically binds to a particular protein or form of a particular protein (such as a phosphorylated form of a protein) that may be present in a sample.
  • Haptens are small organic molecules that are specifically bound by antibodies, although by themselves they will not elicit an immune response in an animal and must first be linked to a larger carrier molecule such as a protein or a poly-nucleic acid to generate an immune response.
  • the antibody comprises an anti-antibody antibody that can be used as a secondary antibody in an immunoassay.
  • the antibody can comprise an anti-IgG antibody such as an anti-mouse IgG antibody, an anti-rabbit IgG antibody or an anti-goat IgG antibody.
  • the disclosed antibody conjugates can be utilized for detecting molecules of interest in any type of binding immunoassay, including immunohistochemical binding assays.
  • the disclosed conjugates are used as a labeled primary antibody in an immunoassay, for example, a primary antibody directed to a particular molecule or a hapten-labeled molecule.
  • a mixture of conjugates directed to the multiple epitopes can be used.
  • the disclosed conjugates are used as secondary antibodies in an immunoassay (for example, directed to a primary antibody that binds the molecule of interest; the molecule of interest can be bound by two primary antibodies in a sandwich-type assay when multi-epitopic).
  • mixtures of disclosed conjugates are used to provide further amplification of a signal due to a molecule of interest bound by a primary antibody (the molecule of interest can be bound by two primary antibodies in a sandwich-type assay).
  • a first conjugate in a mixture is directed to a primary antibody that binds a molecule of interest and a second conjugate is directed to the antibody portion of the first conjugate, thereby localizing more signal-generating moieties at the site of the molecule of interest.
  • Other types of assays in which the disclosed conjugates can be used are readily apparent to those skilled in the art.
  • a method for preparing an antibody-signal-generating moiety conjugate, the method including forming a thiolated antibody from an antibody; reacting a signal-generating moiety having an amine group with a PEG maleimide/active ester bifunctional linker to form an activated signal-generating moiety; and reacting the thiolated antibody with the activated signal-generating moiety to form the antibody-signal-generating moiety conjugate.
  • a thiolated antibody can be formed by reacting the antibody with a reducing agent to form the thiolated antibody, for example, by reacting the antibody with a reducing agent to form a thiolated antibody having an average number of thiols per antibody of between about 1 and about 10.
  • the average number of thiols per antibody can be determined by titration.
  • reducing agents include reducing agents selected from the group consisting of 2-mercaptoethanol, 2-mercaptoethylamine, DTT, DTE and TCEP, and combinations thereof.
  • the reducing agent is selected from the group consisting of DTT and DTE, and combinations thereof, and used at a concentration of between about 1 mM and about 40 mM.
  • forming the thiolated antibody includes introducing a thiol group to the antibody.
  • the thiol group can be introduced to the antibody by reaction with a reagent selected from the group consisting of 2-Iminothiolane, SATA, SATP, SPDP, N-Acetylhomocysteinethiolactone, SAMSA, and cystamine, and combinations thereof (see, for example, Hermanson, “Bioconjugate Techniques,” Academic Press, San Diego, 1996, which is incorporated by reference herein).
  • introducing the thiol group to the antibody includes reacting the antibody with an oxidant (such as periodate, I 2 , Br 2 , or a combination thereof) to convert a sugar moiety of the antibody into an aldehyde group and then reacting the aldehyde group with cystamine.
  • an oxidant such as periodate, I 2 , Br 2 , or a combination thereof
  • the signal-generating moiety can, for example, be an enzyme (such as horseradish peroxidase or alkaline phosphatase).
  • a method for preparing an antibody-signal-generating moiety conjugate that includes reacting an antibody with an oxidant to form an aldehyde-bearing antibody; reacting the aldehyde-bearing antibody with a PEG maleimide/hydrazide bifunctional linker to form a thiol-reactive antibody; and reacting the thiol-reactive antibody with a thiolated signal-generating moiety to form the antibody-signal-generating moiety conjugate.
  • reacting the antibody with an oxidant to form the aldehyde-bearing antibody includes oxidizing (such as with periodate) a glycosylated region of the antibody to form the aldehyde-bearing antibody.
  • reacting an antibody with an oxidant to form an aldehyde-bearing antibody includes introducing an average of between about 1 and about 10 aldehyde groups per antibody.
  • a thiolated signal-generating moiety can be formed from a signal-generating moiety by reacting the signal-generating moiety (such as an enzyme) with a reducing agent (such as a reducing agent selected from the group consisting of 2-mercaptoethanol, 2-mercaptoethylamine, DTT, DTE and TCEP, and combinations thereof) to form the thiolated signal-generating moiety, or by introducing a thiol group (for example, by reacting a signal generating moiety with a reagent selected from the group consisting of 2-Iminothiolane, SATA, SATP, SPDP, N-Acetylhomocysteinethiolactone, SAMSA, and cystamine, and combinations thereof).
  • a reducing agent such as a reducing agent selected from the group consisting of 2-mercaptoethanol, 2-mercaptoethylamine, DTT, DTE and TCEP, and combinations thereof
  • a thiol group for example, by reacting a signal generating
  • a method for detecting a molecule of interest in a biological sample that includes contacting the biological sample with a heterobifunctional PEG-linked antibody-signal-generating moiety conjugate and detecting a signal generated by the antibody-signal-generating moiety conjugate.
  • the biological sample can be any sample containing biomolecules (such as proteins, nucleic acids, lipids, hormones etc.), but in particular embodiments, the biological sample includes a tissue section (such as obtained by biopsy) or a cytology sample (such as a Pap smear or blood smear).
  • the heterobifunctional PEG-linked antibody-signal-generating moiety conjugate includes an antibody covalently linked to an enzyme such as horseradish peroxidase or alkaline phophatase.
  • the heterobifunctional PEG-linked antibody-signal-generating moiety conjugate includes an antibody covalently linked to a detectable construct or a liposome.
  • the signal-generating moiety comprises an enzyme such as alkaline phosphatase and the method further comprises contacting the biological sample with a water-soluble metal ion and a redox-inactive substrate of the enzyme that is converted to a redox-active agent by the enzyme, which redox-active agent reduces the metal ion causing it to precipitate.
  • an enzyme such as alkaline phosphatase
  • the method further comprises contacting the biological sample with a water-soluble metal ion and a redox-inactive substrate of the enzyme that is converted to a redox-active agent by the enzyme, which redox-active agent reduces the metal ion causing it to precipitate.
  • the signal-generating moiety comprises an oxido-reductase enzyme (such as horseradish peroxidase) and the method further comprise contacting the biological sample with a water soluble metal ion, an oxidizing agent and a reducing agent (see, for example, U.S. Pat. No. 6,670,113, which is incorporated by reference herein).
  • an oxido-reductase enzyme such as horseradish peroxidase
  • a disclosed antibody signal-generating moiety conjugate is prepared according to the processes described in schemes 1 to 3 below, wherein the heterobifunctional polyalkylene glycol linker is a polyethylene glycol linker having an amine-reactive group (active ester) and a thiol-reactive group (maleimide).
  • a signal-generating moiety such as an enzyme or a quantum dot
  • an excess of the linker is reacted with an excess of the linker to form an activated signal-generating moiety.
  • Thiol groups are introduced to the antibody by treating the antibody with a reducing agent such as DTT as shown in Scheme 2.
  • a reducing agent such as DTE or DTT
  • a concentration of between about 1 mM and about 40 mM is utilized to introduce a limited number of thiols (such as between about 2 and about 6) to the antibody while keeping the antibody intact (which can be determined by size-exclusion chromatography).
  • Schemes 1-3 illustrate an optimal process for maleimide PEG active esters, wherein the signal-generating moiety is first activated by reacting an amine group with the active ester of the linker to form an activated signal-generating moiety
  • the signal-generating moiety is first activated by reacting either an amine or a thiol on the antibody with the linker and then react the activated antibody with the signal generating moiety [having either a thiol or an amine to react with the remaining reactive group on the linker as appropriate].
  • 3 signal-generating moieties are shown in Scheme 3, it is possible to link multiple antibodies to a single signal-generating moiety or any number of signal-generating moieties to a single antibody.
  • an antibody is activated for conjugation and then conjugated to a signal-generating moiety as shown in Schemes 4 and 5 below.
  • the antibody is activated instead of the signal generating moiety as was shown in Scheme 1.
  • a sugar moiety such as located in a glycosylated region of the Fc portion of the antibody
  • an aldehyde-reactive group of the linker such as a hydrazide group of the illustrated maleimide/hydrazide PEG linker.
  • a thiol-reactive group of the linker portion of the activated antibody (such as a maleimide group as illustrated) is then reacted with a thiol group on the signal generating moiety.
  • the process can be reversed, wherein the linker is first reacted with an aldehyde group on the signal-generating moiety (formed, for example, by oxidation of a sugar moiety) to form an activated signal generating moiety, and then the activated signal generating moiety can be reacted with a thiol group on the antibody.
  • Schemes 4 and 5 show only a single linker joining a single antibody and a single signal-generating moiety, it is to be understood that it is also possible to link multiple signal generating moieties to a single antibody or to link several antibodies to a one signal-generating moiety.
  • HRP can, for example, be activated for conjugation by treatment with a 100-fold molar excess of a bifunctional PEG linker having a maleimide group and an active ester group (for example, the MAL-PEG 4 -NHS, MAL-PEG 8 -NHS or MAL-PEG 12 -NHS linkers available from Quanta Biodesign, Powell, Ohio) at ambient temperature (23-25° C.) for 60 minutes.
  • excess linker-free HRP typically with five to seven maleimides, is obtained with a 100-fold molar excess.
  • An exemplary procedure is outlined below for production of an HRP antibody conjugate using a MAL-PEG 4 -NHS linker.
  • the number of maleimide groups on an activated HRP can determined by the method described in detail in Example D.
  • an antibody for example, an anti-mouse IgG or anti-rabbit IgG antibody, for conjugation an antibody can be incubated with 25 mmol DTT at ambient temperature (23-25° C.) for 25 minutes. After purification across a PD-10 SE column, DTT-free antibody, typically with two to six free thiols, is obtained (Scheme2).
  • DTT-free antibody typically with two to six free thiols.
  • the exemplary procedure outlined for preparing goat anti-mouse IgG thiol is generally applicable to other antibodies. The number of thiols per antibody can be determined by the thiol assay described in Example D.
  • Goat anti-Mouse IgG-thiol (2) To a 8 mL amber vial was added 4.11 mL of Goat-anti-Mouse IgG (Bethyl, Montgomery, Tex.) as a 3.01 mg/mL solution in 0.1 M sodium phosphate, 1.0 mM EDTA, pH 6.5. To this solution was then added 216 ⁇ L of a freshly prepared 500 mM solution of the reducing agent DTT (1,4-Dithiothreitol, Sigma-Aldrich, St. Louis, Mo.). The vial was placed in the dark on an autorotator and the disulfide reduction was allowed to proceed for 25 minutes.
  • DTT 1,4-Dithiothreitol
  • the reaction solution was split into four equal volumes (due to the limited capacity of a desalting column used), and excess DTT was removed by passing each of the fractions across a PD-10 desalting column eluted with 0.1 M sodium phosphate, 1.0 mM EDTA, pH 6.5.
  • the antibody containing fractions were combined to give 8.0 mL of a 1.22 mg/mL solution of DTT free Goat-anti-Mouse IgG-SH (78% recovery) as measured by UV/VIS spectrophotometry using an extinction coefficient at 280 nm of a 1% solution at pH 6.5 of 14.
  • a thiolated antibody such as anti-mouse IgG-thiol or anti-rabbit IgG-thiol
  • HRP-PEG 4 -maleimide is added to a thiolated antibody.
  • the reaction is then incubated at ambient temperature (23-25° C.) for 16 hours.
  • a conjugate typically with an average of 2 or 3 HRPs per antibody, is obtained.
  • the number of HRPs per antibody is determined by measuring the ratio of absorbances at 280 nm/403 nm of the conjugate, and performing the calculations outlined in section Example D.
  • An exemplary procedure is outlined below.
  • HRP-PEG 4 -Goat-anti-Mouse IgG (3) To an 8 mL amber vial was added 4.0 mL of the Goat-anti-Mouse IgG-thiol solution (2) (1 eq., 4.88 mg, 0.0326 ⁇ mol) and 864 ⁇ L of the HRP-PEG 4 -maleimide solution (1) (3 eq., 3.91 mg, 0.0976 ⁇ mol). The vial was then placed on an autorotator in the dark at ambient temperature (23-25° C.), and the Michael addition was allowed to proceed for 16 hours.
  • HRP-PEG 4 -Goat-anti-Mouse IgG conjugate devoid of free antibody and free HRP was then obtained by fractionating the sample on an Akta Purifier fitted with a Superdex 10/300 column (Amersham, Piscatawy, N.H.) eluted with 0.1 M sodium phosphate, pH 7.5, at 0.9 ml/minute. After pooling fractions, 9.73 mL of a 1.04 mg/mL solution of conjugate was obtained as determined by Pierces' Coomasie Plus protein assay described in Example C. The conjugate was then stored in a cold room at 4° C. until use.
  • the MW profiles of a total of twelve examples of the disclosed conjugates were determined by size-exclusion chromatography on an Akta Purifier fitted with a Superdex 200 10/300 GL column (Amersham, Piscatawy, N.J.) eluted with 0.1 M sodium phosphate buffer pH 7.5, 0.5-1.0 mL/min.
  • Molecular weight calibration standards included: Aldolase (158 kDa), Catalase (232 kDa), Ferritin (440 kDa), Thyroglobin (669 kDa), Ribonuclease A (13.7 kDa), Chymotrypsinogen (25 kDa), Ovalbumin (43 kDa), and Albumin (67 kDa).
  • the conjugates examined had an average MW between about 230 and about 330 kDa with an overall range of MWs for a given conjugate of approximately 190-550 kDa Reinjection of purified conjugates demonstrated that conjugates were free of non-conjugated HRP and antibody.
  • the following representative methods may be used to determine maleimide and thiol content as well as the number of HRP molecules per conjugate.
  • Reaction Buffer 0.1 M sodium phosphate; 1 mM EDTA, pH 8.0.
  • Standard 900 100 ⁇ l of working stock 2 mM stock Standard 1 500 ⁇ l 500 ⁇ l of Standard stock 1 mM Standard 2 500 ⁇ l 500 ⁇ l of Standard 1 0.5 mM Standard 3 500 ⁇ l 500 ⁇ l of Standard 2 0.25 mM Standard 4 500 ⁇ l 500 ⁇ l of Standard 3 0.125 mM Standard 5 500 ⁇ l 500 ⁇ l of Standard 4 0.0625 mM Standard 6 500 ⁇ l 500 ⁇ l of Standard 5 0.03125 mM Standard 7 500 ⁇ l 500 ⁇ l of Standard 6 0.015625 mM Standard 8 1000 ⁇ l 0 mM (blank)
  • the protein concentration in mM is determined by dividing the protein concentration in mg/ml (obtained from total protein assay) by the FW of the sample and multiplying by 1000. Then, the number of thiols per antibody molecule is obtained by dividing the mM thiol experimental concentration obtained from above by the protein concentration in mM obtained from the previous step. The number of maleimides per horseradish peroxidase molecule is determined by first subtracting the experimental mM thiol concentration obtained above from 0.5 mM, and then multiplying this difference by 2 and dividing by the protein concentration in mM.
  • a typical range for thiolation of an antibody is between about 1 and about 10 thiols per antibody molecules, for example, between about 2 and about 6 such as between about 2 and about 4.
  • a typical range for the number of maleimide groups incorporated per HRP molecule is between about 1 and about 10, for example, between about 3 and about 8 such as between about 5 and about 7.
  • the determination of the extinction coefficient at 280 nm of a one percent (1 mg/mL) solution of HRP-antibody conjugate is determined by ascertaining the conjugate protein concentrations, and then measuring the absorbance at 280 nm. Protein concentrations can be measured according to the Pierce Coomasie assay described above.
  • FIG. 1 A-D The stability at 45° C. of a cocktail of goat anti-mouse and goat anti-rabbit HRP conjugates in IHC was determined in an Avidin diluent with B5 blocker (Ventana Medical Systems, Inc, Arlington, Ariz.) and the results are shown in FIG. 1 A-D.
  • Fixed, paraffin-embedded human tonsil tissue sections were probed using CD20/L26 (mouse) primary antibodies, followed by DAB detection with the cocktail of HRP conjugates according to a standard automated protocol on a BenchMark® XT autostainer (Ventana Medical Systems, Inc, Arlington, Ariz.). All slides were done in were done in triplicate.
  • FIG. 1A shows typical results on Day 0 of the test; FIG.
  • FIG. 1B shows typical results on Day 1 of the test
  • FIG. 1C shows typical results on Day 3 of the test
  • FIG. 1D shows typical results on Day 7 of the test. Even at the high temperature of 45° C., the disclosed conjugates were not completely degraded (30-40% loss of staining intensity) by day 7, demonstrating that the disclosed conjugates are highly stable.
  • Goat anti-mouse IgG conjugate made with MAL-PEG 4 -NHS linker, goat anti-rabbit IgG conjugate also made with the same linker, or a mixture of rabbit anti-mouse IgG and the two conjugates (“amplification”) was used as a secondary antibody reagent for detection of binding to tissue antigens of the primary antibodies that are listed below (available from Ventana Medical Systems, Inc, Arlington, Ariz.). Appropriate archival tissue sections were treated with these conjugates and developed using standard protocols for HRP signal generation (by addition of DAB) on an automated stainer (BenchMark® XT, Ventana Medical Systems, Inc, Arlington, Ariz.).
  • a typical automated protocol includes deparaffinization, several rinse steps, addition of a reaction buffer, addition of the primary antibody, addition of the secondary antibody, addition of DAB and hydrogen peroxide, and addition of a counterstain.
  • scaffolded conjugates were either a second generation scaffolded conjugate (smaller, more homogeneous as determined by size-exclusion chromatography) or a first generation (larger, more inhomogeneous as determined by size-exclusion chromatography). See, U.S. Pat. Nos. 6,613,564 and 6,252,053 for a more complete description of the scaffolded conjugates.
  • FIG. 2 shows the staining results for bcl-2 detection for the disclosed conjugate ( FIG. 2A ) and the second generation scaffolded conjugate ( FIG. 2B ). The results demonstrate that higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 3 shows the staining results for CD-15 detection using the disclosed conjugate ( FIG. 3A ) and the second generation scaffolded conjugate ( FIG. 3B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 4 shows the staining results for CD-20 detection using the disclosed conjugate (amplification utilized, FIG. 4A ) and the second generation scaffolded conjugate ( FIG. 4B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 5 shows the staining results for CD-23 detection using the disclosed conjugate ( FIG. 5A ), the second generation scaffolded conjugate ( FIG. 5B ), and the first generation scaffolded conjugate ( FIG. 5C ).
  • the results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections than is seen for both scaffolded conjugates.
  • FIG. 6 shows the staining results for CD57 detection using the disclosed conjugate ( FIG. 6A ) and the second generation scaffolded conjugate ( FIG. 6B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 7 shows the staining results for cerb-B2/CB11 detection using the disclosed conjugate ( FIG. 7A ), the second generation scaffolded conjugate ( FIG. 7B ), and the first generation scaffolded conjugate ( FIG. 7C ).
  • the results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections than is seen for both scaffolded conjugates.
  • FIG. 8 shows the staining results for cyclin D1 detection using the disclosed conjugate ( FIG. 8A ) and the second generation scaffolded conjugate ( FIG. 8B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 9 shows the staining results for EGFR detection using the disclosed conjugate ( FIG. 9A ), the second generation scaffolded conjugate ( FIG. 9B ), and the first generation scaffolded conjugate ( FIG. 9C ).
  • the results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections than is seen for both scaffolded conjugates.
  • FIG. 10 shows the staining results for ER detection using the disclosed conjugate ( FIG. 10A ) and the second generation scaffolded conjugate ( FIG. 10B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 11 shows the staining results for p53 detection using the disclosed conjugate ( FIG. 11A ) and the second generation scaffolded conjugate ( FIG. 11B ). The results demonstrate comparable staining is achieved between the disclosed conjugate and the scaffolded conjugate in comparable tissue sections.
  • FIG. 12 shows the staining results for PR detection using the disclosed conjugate ( FIG. 12A ) and the second generation scaffolded conjugate ( FIG. 12B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 13 shows the staining results for PSA detection using the disclosed conjugate ( FIG. 13A ) and the second generation scaffolded conjugate ( FIG. 13B ). The results demonstrate higher intensity staining is achieved with the disclosed conjugate in comparable tissue sections.
  • FIG. 15A shows a tissue stained with the disclosed conjugate at day 0, which may be compared to the tissue stained with the scaffolded conjugate at day 0 in FIG. 15B .
  • FIG. 15C shows a tissue stained with the disclosed conjugate at day 7 after storage at 37° C. for 7 days, which may be compared to the tissue stained with the scaffolded conjugate at day 7 after storage at 37° C. for 7 days in FIG. 15D .
  • FIG. 15E shows a tissue stained with the disclosed conjugate at day 7 after storage at 45° C. for 7 days, which may be compared to the tissue stained with the scaffolded conjugate at day 7 after storage at 45° C. for 7 days in FIG. 15F .
  • the tissue staining intensity shown in the figures demonstrates the superior stability of the disclosed conjugate at both temperatures over a period of 7 days, with the scaffolded conjugate showing complete loss of staining ability after 7 days at the higher temperature.
  • the relative stability over time of the disclosed conjugate and the scaffolded conjugate for detecting single copy and for detecting multiple copies of a target DNA sequence is shown in graphic form in FIG. 16A (37° C.) and FIG. 16B (45° C.).
  • the graphs illustrate how much less effective the scaffolded conjugate is for enzyme metallography of both single and multiple copy targets, how the scaffolded conjugate is completely ineffective for single copy detection while the disclosed conjugate was effective for single copy detection even after many days of storage at elevated temperature, and how the disclosed conjugate maintains its ability for multiple copy detection over time at both temperatures while the scaffolded conjugate quickly loses its ability to amplify the gene signal at both temperatures.
  • Example B Following the procedure of Example B, a series of reactions were set up altering the linker type and size. The following linkers were used: LC-SMCC (16 atom hydrophobic linker, Pierce, Rockford Ill.), MAL-dPEG 8 -NHS ester (34 atom hydrophilic linker, Quanta Biodesign, Inc., Powell Ohio), MAL-dPEG 12 -NHS ester (46 atom hydrophilic linker, Quanta Biodesign, Inc., Powell Ohio), as well as the recommended MAL-dPEG 4 -NHS ester (22 atom hydrophilic linker, Quanta Biodesign, Inc., Powell Ohio).
  • LC-SMCC (16 atom hydrophobic linker, Pierce, Rockford Ill.
  • MAL-dPEG 8 -NHS ester 34 atom hydrophilic linker, Quanta Biodesign, Inc., Powell Ohio
  • MAL-dPEG 12 -NHS ester 46 atom hydrophilic linker, Quanta Biodesign, Inc., Powell Ohio
  • the LC-SMCC was dissolved in dimethylformamide (DMF) and added to the HRP, but not exceeding 10% total volume of DMF in buffer. After coupling to the DTT-treated antibody, size exclusion chromatograms ( FIG. 18 ) were obtained upon purification.
  • DMF dimethylformamide
  • the HRP/IgG conjugates were synthesized using the protocol outlined in Example B, but the ratio of the DTT-reduced antibody to the maleimide derivatized HRP was varied. The following ratios (Antibody/HRP) were tested: 3:1, 1:3, 1:2, 1:4, 1:5, 1:10, 1:20, as well as the recommended 1:3.
  • the profiles in the size exclusion chromatographs show that as the relative amount of HRP increases, so does the overall size of the conjugate, with the 1:20 (Ab:HRP) giving the largest conjugate and the 3:1 (Ab:HRP) generating the smallest.
  • Rabbit anti-Biotin thiol To a 4 mL amber vial was added 2.0 mL of Rabbit anti-Biotin (Bethyl, Montgomery Tex.) as a 1.0 mg/mL solution. To this solution was then added 105.2 ⁇ L of a freshly prepared 500 mM solution of the reducing agent DTT (1,4-Dithiothreitol). The vial was placed in the dark on an autorotator and the disulfide reduction was allowed to proceed for 25 minutes.
  • Rabbit anti-Biotin thiol To a 4 mL amber vial was added 2.0 mL of Rabbit anti-Biotin (Bethyl, Montgomery Tex.) as a 1.0 mg/mL solution. To this solution was then added 105.2 ⁇ L of a freshly prepared 500 mM solution of the reducing agent DTT (1,4-Dithiothreitol). The vial was placed in the dark on an autorotator and the disulfide reduction was allowed to proceed
  • the reaction solution was split into two equal volumes (due to the limited capacity of the desalting columns), and the excess DTT was removed by passing each of the for fractions across a PD-10 desalting column eluted with 0.1 M sodium phosphate, 1.0 mM EDTA, pH 6.5.
  • the antibody containing fractions (F4-5) were combined to give 4.0 mL of a 0.436 mg/mL solution of DTT free Rabbit anti-Biotin-SH (87.5% recovery) as measured on a Agilent 8453 UV/VIS spectrophotometer using an extinction coefficient at 280 nm of a 1% solution at pH 6.5 of 14.
  • HRP-Antibody Conjugation (6) To the rabbit anti-biotin-IgG-thiol (5), was added a three fold molar excess of HRP-PEG 12 -maleimide (4). The reaction was then incubated at ambient temperature (23-25° C.) overnight. After purification across a Superdex 200 10/300 GL SE column, 875 mg of conjugate with an average M.W. of 359 kD was obtained.
  • Example G The enzyme metallographic procedure outlined in Example G was repeated using the PEG 12 anti-biotin conjugate as the primary antibody (i.e. no amplification), and resulted in surprisingly intense staining even though no amplification was employed.
  • Scheme 6 shows a general method for preparing maleimide/hydrazide heterobifunctional PEG linkers. Briefly, a maleimide/active ester PEG linker (such as obtained from Quanta Biodesign) is reacted with a protected hydrazine derivative, and then reacted with acid to yield the maleimide/hydrazide PEG linker.
  • a maleimide/active ester PEG linker such as obtained from Quanta Biodesign
  • the column was eluted with 30-60% ACN/water over 30 min at a flow rate of 12 mL/min.
  • the desired Boc protected-PEG 4 -maleimide 9 eluted at 38 minutes giving 50 mg of a thick yellow oil after drying under high vaccum.
  • the final deprotected hydrazide 10 was then obtained by stirring the residue with 6 ml of anhydrous 2 N HCL/dioxane under dry nitrogen for 45 minutes. Concentration via rotory evaporation then gave 55 mg of the hydrazide-PEG 4 -maleimide HCL salt.

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AU2006239315B2 (en) 2012-03-01
CA2609702C (fr) 2013-05-28
US20140147906A1 (en) 2014-05-29
US20160187324A1 (en) 2016-06-30
AU2006239315A1 (en) 2006-11-02
WO2006116628A2 (fr) 2006-11-02
ES2609919T3 (es) 2017-04-25
US20090176253A1 (en) 2009-07-09
EP1877101A2 (fr) 2008-01-16
CA2609702A1 (fr) 2006-11-02
JP5628476B2 (ja) 2014-11-19
JP2008539270A (ja) 2008-11-13
US9315789B2 (en) 2016-04-19
EP1877101B1 (fr) 2016-11-16
EP3144675A1 (fr) 2017-03-22
WO2006116628A3 (fr) 2007-12-13
US11359185B2 (en) 2022-06-14
US8658389B2 (en) 2014-02-25
DK1877101T3 (en) 2017-01-09

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