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EP1629275A2 - Procede de selection d'epitopes pour l'immunotherapie - Google Patents

Procede de selection d'epitopes pour l'immunotherapie

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Publication number
EP1629275A2
EP1629275A2 EP04735707A EP04735707A EP1629275A2 EP 1629275 A2 EP1629275 A2 EP 1629275A2 EP 04735707 A EP04735707 A EP 04735707A EP 04735707 A EP04735707 A EP 04735707A EP 1629275 A2 EP1629275 A2 EP 1629275A2
Authority
EP
European Patent Office
Prior art keywords
ala
val
lys
ile
leu
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04735707A
Other languages
German (de)
English (en)
Inventor
Hans Loibner
Gottfried Himmler
Alois Jungbauer
Erich Wasserbauer
Manfred Schuster
Rainer Hahn
Astrid DÜRAUER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALTROPUS GMBH
Original Assignee
Igeneon Krebs-Immuntherapie Forschungs- und Entwicklungs-GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Igeneon Krebs-Immuntherapie Forschungs- und Entwicklungs-GmbH filed Critical Igeneon Krebs-Immuntherapie Forschungs- und Entwicklungs-GmbH
Publication of EP1629275A2 publication Critical patent/EP1629275A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
    • C07K16/3076—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells against structure-related tumour-associated moieties
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
    • C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
    • C07K14/4701—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
    • C07K14/4748—Tumour specific antigens; Tumour rejection antigen precursors [TRAP], e.g. MAGE
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies

Definitions

  • the invention relates to a method for the selection of epitopes for immunotherapy, peptides obtainable by this method and the use of the peptides as vaccines and as diagnostic agents and an immune serum obtainable by this method.
  • Immunotherapy must not only be safe, that is, the vaccines must not have any toxicity, but protective immunity must also be brought about and the longest-lasting immunological memory possible. Especially with cancer, one of the three most common causes of death in industrialized countries, immunotherapy is an important prophylactic and therapeutic approach.
  • Tumor-associated antigens are often the basis for the development of immunotherapeutic agents for the prophylaxis and / or treatment of cancer.
  • TAA are structures that are preferentially expressed on the cell membrane of tumor cells, thereby enabling differentiation from non-malignant tissue and are therefore seen as target points for diagnostic and therapeutic applications of specific antibodies.
  • Examples of tumor-associated carbohydrate structures are the Lewis antigens, which are increasingly expressed in many epithelial cancers. These include Lewis x, Lewis b and Lewis y structures, as well as sialylated Lewis x structures.
  • carbohydrate antigens are GloboH structures, KH1, Tn antigen,, TF antigens, the alpha-1,3-galactosyl epitope (Elektrophoresis (1999), 20: 362; Curr. Pharmaceutical Design (2000 ), 6: 485, Neoplasma (1996), 43: 285).
  • TAA are proteins that are particularly strongly expressed on cancer cells, e.g. CEA, TAG-72, MUC1, Folate Binding Protein A-33, CA125, EpCAM and PSA.
  • Direct therapeutic applications of antibodies against TAA are based on passive immunotherapies, which means that a specific antibody is administered systemically in a suitable amount to cancer patients and has a therapeutic effect only as long as the concentration in the organism is sufficiently high for this.
  • the biological half-life of such agents depends on their structure and ranges from a few hours to several days. It is therefore necessary to carry out repeated applications.
  • xenogenic antibodies eg murine monoclonal antibodies, MAK
  • Another approach to cancer immunotherapy is to selectively activate the cancer patient's immune system to fight malignant cells. This is being attempted using various forms of cancer vaccines. This includes vaccinations with autologous or allogeneic tumor cells, chemically or molecular biologically modified autologous or allogeneic tumor cells, isolated or produced with the help of chemical or molecular biological methods, TAA derived therefrom, recently also vaccinations with DNA coding for TAA or structures derived therefrom, etc.
  • An alternative method is based on the use of anti-idiotypic antibodies for vaccination against cancer. Suitable anti-idiotypic antibodies can immunologically mimic a TAA. As foreign proteins (e.g.
  • anti-idiotypic antibodies can be used as an immunogenic replacement of a tumor antigen for vaccination.
  • a suitable vaccine In contrast to passive immunotherapy with anti-tumor antibodies, very small amounts of a suitable vaccine are in principle sufficient for active specific cancer immunotherapy to induce immunity for months to years, which can be refreshed again after weakening by booster vaccinations.
  • both humoral and cellular immunity can be induced with active immunization, the interaction of which can result in an effective protective effect.
  • TAAs have important functions for cancer cells. They enable the degenerated cells to have characteristic properties for the malignant phenotype, e.g. exercise increased adhesiveness, which are of great importance for the establishment of metastases.
  • antigens can also be expressed on normal cells, where they are responsible for normal functions of these cells. Without claiming to be complete, here are some examples of such antigens:
  • N-CAM Neuronal Cell Adhesion Molecule
  • the Lewis Y carbohydrate antigen which appears on the majority of tumors of epithelial origin, but also plays an important role during the fetal development of epithelial tissues. It has been shown that the expression of this antigen in lung cancer is strongly associated with an unfavorable prognosis, since Lewis Y positive cancer cells obviously have a higher metastatic potential (N. Engl. J. Med. 327 (1992), 14).
  • CEA Carcino Embryonic Antigen
  • Ep-CAM Epidermal Cell Adhesion Molecule
  • epitopes that are particularly well suited for antibody detection, for example because they are located on the surface of a protein, or epitopes that lead to particularly good antibody formation in immune sera. isolate.
  • a simple and quick selection process for such epitopes or isolated peptide sequences of these epitopes would be advantageous for the success of immunotherapies.
  • Mintz et al. Describe a combinatorial approach to this, whereby peptides were isolated from “phage display random peptide libraries" using immunoglobulins isolated from patients with prostate cancer. This "fingerprint” method was used to identify specific prognostic serological markers and isolate their corresponding native antigens. Prior immunotherapy in these patients is not described. The humoral immune system was used to isolate a consensus sequence that can serve as a serological marker for the chances of survival (Nature Biotechn., 2003, 21, 57-63; Nature Biotechnol., 2003, 21, 37ff).
  • Mosolits et al. describe the binding of sera from patients with colorectal cancer to immunogenic regions of the GA733-2 tumor-associated antigen (TAA).
  • TAA tumor-associated antigen
  • WO 97/15597 describes peptides whose amino acid sequence is derived from EpCAM and which bind to the MHC I molecule.
  • EP 0 326 423 describes vectors and methods for expressing the recombinant human adenocarcinoma antigen.
  • the patients did not receive any immunotherapy, the immune serum did not come from patients who had been treated with an effective vaccine.
  • the present invention is therefore based on the object of providing a method for the selection of epitopes.
  • a method for the selection of epitopes for immunotherapy in which an immune serum is brought into contact with peptide sequences of an antigen of at least 6 amino acids in length and the binding of the immune serum to the peptide sequences is compared with the binding of a presenum.
  • the immune serum can be isolated from subjects who have been immunized with a vaccine.
  • the immunization develops antibodies against the antigen or the antigenic structures with which the immunization was carried out.
  • Preferred antigens are selected from the group of tumor-associated antigens (TAA).
  • TAA tumor-associated antigens
  • TAA are structures that are preferentially expressed on the cell membrane of tumor cells, thereby enabling differentiation from non-malignant tissue and are therefore seen as target points for the diagnostic and therapeutic applications of specific antibodies.
  • the TAA are selected from the group of self-adhesion molecules or cell adhesion molecules, which can have the effect that, for example, tumor cells have strong cell-cell adhesion.
  • An example of a self-adhesion molecule is EpCAM.
  • Cancer cells practically always have, besides other physiological characteristics that distinguish them from normal cells, a different type of glycosylation (Glycoconj. J. (1997), 14: 569; Adv.Cancer Res. (1989), 52: 257; Cancer Res (1996), 56: 5309). Although the changes from tissue to tissue vary, it can be seen that aberrant glycosylation is typical of cancer cells.
  • carbohydrate structures are e.g. all Lewis antigens that are increasingly expressed in many epithelial cancers.
  • Lewis y structures these also include Lewis x and Lewis b structures, as well as sialylated Lewis x structures.
  • Other carbohydrate antigens are Globo-H structures, KH1, Tn antigen and sialyl Tn antigen, TF antigen and the alpha-1,3 galactosyl epitope (Elektrophoresis (1999), 20: 362; Curr. Pharmaceutical Design ( 2000), 6: 485, Neoplasma (1996), 43: 285)
  • TAA are proteins that are particularly strongly expressed by cancer cells, e.g. CEA, TAG-72, MUC1, Folate Binding Protein A-33, CA125, EpCAM, HER-2 / neu, PSA, MART, etc. (Sem. Cancer Biol. (1995), 6: 321).
  • Relevant TAA are often surface antigens of epithelial cells, which increasingly occur in growing cells, such as fetal tissue, and also tumor tissue.
  • a special group of TAA are involved in the adhesion processes of the epithelial cells.
  • Cellular adhesion proteins that are overexpressed on tumor cells include EpCAM, NCAM and CEA.
  • the peptide sequences can be bound to a support using known methods and brought into contact with the immune serum or the preserum.
  • the method according to the invention is preferably carried out via epitope mapping by means of solid phase peptide synthesis and spot synthesis.
  • the peptides are bound to the carrier material directly or by means of spacer sequences.
  • the immune serum and preserum can be purified by methods which are known from the prior art.
  • the purification can be carried out using Protein G Sepharose and the immunoglobulins obtained in this way can be biotinylated or coupled with radioactive substances in order to simplify the detection method.
  • preserum is serum from test subjects who do not receive immunotherapy with an antigen have peptides with which the serum is later brought into contact.
  • immune serum is serum from test subjects who have received immunotherapy with an antigen with the peptide sequences of which the serum is subsequently brought into contact.
  • This can be, for example, an immunization with epitopes against TAA, as mentioned above.
  • Immunotherapy with immunogenic antibodies was particularly preferred, as described for example in EP 1 140 168, EP 1 230 932, EP 0 644 947 and EP 0 528 767.
  • a preferred antibody which is used for active immunotherapy is an anti-EpCAM antibody, as described in WO 00/41722 or A599 / 2003.
  • an effective vaccine is to be understood as a vaccine which is effective in prophylaxis and / or in therapy.
  • the effectiveness of active immunotherapy is preferably demonstrated by the patient developing an immune response against the immunogenic substance.
  • the immune response can be measured by detecting seroconversion in the patient's serum.
  • the seroconversion is determined, for example, by detecting a differential measurement of the binding of the immunoglobulins from the patient's serum (preserum and immune serum) to the antigen used for the immunization.
  • the treatment of patients with the effective vaccine leads to an increase in the survival time or increase in the survival rate in cancer diseases, for example in colorectal or rectal cancer, by at least 10%, preferably at least 20%, preferably at least 30%, particularly preferably at least 50% compared to patients without treatment with the effective vaccine.
  • the different binding patterns of pre- and immune sera to the peptides on the carrier material can be compared.
  • the method is carried out such that the binding of the immune serum to the peptide sequences is stronger than the bond of the presum.
  • the different binding affinity can be shown, for example, by an optically stronger signal which shows the immune serum in comparison to the preserum in the binding to the peptide sequence.
  • the stronger binding pattern can also be due to the fact that the amount of the antibody which binds to this peptide sequence is increased and leads to a stronger binding signal.
  • peptides to which the immune serum has a different binding than the preserum can also be isolated using the claimed method. They are preferably peptides from tumor-associated self-adhesion molecules, for example peptides of the EpCAM protein, preferably peptides from the extracellular domain of the EpCAM protein.
  • peptides with a length of at least 6 amino acids which lie within one of the following amino acid sequences or are selected from one of the following amino acid sequences: Asn Cys Phe ' Val Asn Asn (NCFVNN)
  • they are also peptides with a length of at least 6 amino acids, selected from one of the following amino acid sequences of the EpCAM molecule, which can also be responsible for self-adhesion
  • the length of the peptides depends on their use.
  • the length thereof is preferably at least 6 amino acids and at most 30 amino acids, preferably at most 20 'amino acids, preferably at most 15 amino acids, preferably at most 10 amino acids.
  • the peptides can be bound to carrier molecules.
  • Preferred carrier molecules are antibodies or antibody derivatives or fragments, IgG2a antibodies or fragments, KLH (keyhole limpet hemocyanin), serum albumin etc. Particularly preferred carrier molecules are used which have an immunogenic / effect.
  • immunogenic defines any structure that leads to an immune response in a specific host system.
  • a murine antibody or its fragments can be highly immunogenic in the human organism, especially if it is administered with adjuvants.
  • a vaccine for active immunotherapy can be produced which contains the peptide together with a suitable adjuvant.
  • Vaccine adjuvants such as aluminum hydroxide are suitable for this (Aluminum gel) or phosphate, growth factors, lymphokines, cytokines, for example IL-2, IL-12, GM-CSF, gamma interferon, or complement factors, such as C3d, further liposome preparations or lipopolysaccharide from E. coli (LPS) but also formulations with additional antigens against which the immune system has already given a strong immune response, such as tetanus toxoid, bacterial toxins such as Pseudomonas exotoxins and derivatives of lipid A.
  • additional antigens against which the immune system has already given a strong immune response such as tetanus toxoid, bacterial toxins such as Pseudomonas exotoxins and derivatives of lipid A.
  • Known methods for conjugating or denaturing vaccine components can also be used for vaccine formulation in order to further increase the immunogenicity of the active ingredient.
  • the vaccine containing a peptide according to the invention with a carrier molecule for the active immunization is preferably administered in an amount between 0.01 ⁇ g and 10 mg.
  • the immunogenicity of the vaccine can be increased by xenogenic substances or derivatization of the antibody, which can serve as a carrier molecule for the peptide.
  • the immunogenic dose of the vaccine is preferably between 0.01 ⁇ g and 750 ⁇ g, preferably between 100 ⁇ g and 1 mg, most preferably 100 ⁇ g and 500 ⁇ g.
  • a vaccine that is administered as a depot medication naturally contains significantly higher amounts of immunogenic substance, for example at least 1 mg to 10 mg. The vaccine is released in the body over a longer period of time.
  • the peptide can also be used as a target antigen for passive immunotherapy.
  • an antibody can be produced which contains this peptide as an epitope and binds to EpCAM.
  • this antibody is administered several times at 1 to 2 week intervals.
  • the preferred amount of antibody administered is between 1 mg and 1 g, preferably between 100 mg and 500 mg, and is preferably administered intravenously.
  • an immune serum containing antibodies against epitopes which were obtained by the method according to the invention for the selection of epitopes, is also included.
  • a vaccine against tumor cells expressing EpCAM which are used to form the immune serum leads.
  • This vaccine can contain, for example, peptides, antibodies, antibody derivatives or mimotopes, anti-idiotypic antibodies or plasmids which express the EpCAM protein, together with suitable carrier substances.
  • the peptides obtained by the process according to the invention can also be used as an “antisense , peptide.
  • a peptide that binds to a region necessary for cell adhesion can prevent it.
  • proteins such as EpCAM or CEA, this can mean that the cells can no longer merge to form cells and the formation of metastases is delayed or prevented.
  • a diagnostic for the detection of specific immunoglobulins containing a peptide obtained by the method according to the invention and a detection means for determining the binding of an immune serum can also be provided.
  • test strips to which peptides are coupled can be incubated with immune sera, and the immunoglobulin specificity can be detected on the basis of the staining pattern. After incubation with biotinylated patient serum, the interaction with specific immunoglobulins is demonstrated by a color reaction.
  • the aim is to show a built-up reactivity against specific protein regions of an immunization antigen and to describe the specificity of a built-up immune response. For example, a therapeutic effect can be correlated from the proven reactivity.
  • the peptides can be coupled with biotin groups or radioactive markers and a measurable signal can be read by the radiation striking an X-ray film or radiation-sensitive film and leading to a signal.
  • FIG. 1 shows an example of a result of the EpCAM epitope mapping by means of solid phase synthesis.
  • Figure 2 shows the amino acid sequence of the EpCAM molecule.
  • the transmembrane region and the cytoplasmic region are short S1V.
  • Example 1 Epitope apping using a solid phase peptide synthesis:
  • Protein G Sepharose Fast Flow (Amersham Biosciences). was packed into an HR 5 column (inner diameter 5 mm; Amersham Biosciences). The column was equilibrated at a flow rate of 0.33 ml / min with 5 column volumes of PBS buffer. Then serum was loaded at the same flow rate and washed with a further 5 column volumes. Elution was carried out with 0.2 M acetic acid + 20% ethylene glycol, pH 2.7. The eluate was collected in 1 M sodium bicarbonate buffer and brought to pH 8.6.
  • the spot synthesis was carried out according to a modified method according to Frank (Tetrahedron 48 (1992) 9217-9232). Whatman 540 cellulose was dried in a desiccator overnight. The membrane was then functionalized with 0.2 M Fmoc- ⁇ -alanine, 0.24 M diisopropyl carbodiimide and 0.4 M 1-methyl-imidazole for 3 hours. After washing with 3 ⁇ dimethylfor amide (DMF), the Fmoc group was split off by treatment with 20% piperidine in DMF. The peptides were synthesized using an AutoSpot Robot ASP222 (INTAVIS, Germany). Another ß-alanine spacer was always introduced as the first amino acid.
  • the membrane was treated with 90% trifluoroacetic acid, 3% triisobutylsilane, 1% phenol, 2% water and 4% dichloromethane for 30 minutes.
  • the membrane was then washed 5 times with DCM, 3 times with DMF and methanol and dried.
  • DA ' ⁇ after there was a further cleavage by treatment with 50% trifluoroacetic acid, 3% Triisobutylsilane, 1% phenol, 2% water and 44% dichloromethane for two hours.
  • the mixture was then washed again with DCM, DMF and methanol and the membrane was stored at ⁇ 20 ° C.
  • IgG Since the predominant immune response is in the form of IgG, IgG was purified from the sera via Protein G Sepharose. After acidic elution with 0.2 M acetic acid in the presence of 20% ethylene glycol, the individual fractions were collected in 1M sodium carbonate in order to increase the pH as quickly as possible. These conditions also allow the purified IgG to be biotinylated immediately afterwards without previous buffering.
  • biotinylation reagent Biotinamidocaproate N-hydroxysuccinimideester, NHS-LC-Biotin, ECL protein biotinylation module, RPN 2202, from Amersham Biosciences
  • concentration of the biotinylated IgG was determined by photometric absorption measurement at 280 nm and the material was stored at 4 ° C. after adding 0.2% sodium azide.
  • the membrane development is very similar to that of a Western blot and is built up from the same steps: the cellulose membranes were conditioned in 20% methanol and blocked with 3% BSA / PBS-T. The incubation with the biotinylated sera then took place. After a washing step, incubation was carried out with streptavidin-HRP conjugate (ECL protein biotinylation module, RPN 2202, from Amersham Biosciences), in order then to induce the detectable light development via oxidation of the peroxidase in the presence of an amplifier solution. The membranes were measured immediately after development and with a constant measurement duration. The blank membranes carried were only incubated with dilution buffer instead of biotinylated IgG and then with streptavidin-HRP.
  • a displacement test was carried out in addition to the analysis of the biotinylated preimmune and immune sera.
  • part of the purified preimmune sera was not biotinylated, but only buffered in PBS.
  • the immune serum came from a patient who underwent active immunotherapy with mAbl7-1A, an EpCAM antibody.
  • the immune serum was withdrawn 71 days after the immunization.
  • the preserum was removed on day 1, ie shortly before the start of treatment. It was shown that immune serum binds more strongly to the lomer peptides. de 1-2, 34-36, 42, 45 53, 61, 68-71 while the preserum does not show this bond or shows it only to a small extent.

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Abstract

L'invention concerne un procédé de sélection d'épitopes pour l'immunothérapie, des peptides pouvant être obtenus par ce procédé et l'utilisation de ces peptides comme vaccin et comme diagnostic ainsi qu'un sérum immun pouvant être obtenu par ledit procédé.
EP04735707A 2003-06-02 2004-06-02 Procede de selection d'epitopes pour l'immunotherapie Withdrawn EP1629275A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT8522003 2003-06-02
PCT/AT2004/000193 WO2004106917A2 (fr) 2003-06-02 2004-06-02 Procede de selection d'epitopes pour l'immunotherapie

Publications (1)

Publication Number Publication Date
EP1629275A2 true EP1629275A2 (fr) 2006-03-01

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US (1) US20070243201A1 (fr)
EP (1) EP1629275A2 (fr)
WO (1) WO2004106917A2 (fr)

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Publication number Priority date Publication date Assignee Title
EP2819695B1 (fr) * 2012-03-02 2018-06-27 Academia Sinica Anticorps anti-molécules d'adhérence cellulaire épithéliale (epcam) et leurs procédés d'utilisation
CN114230655B (zh) * 2021-03-24 2025-02-25 深圳市新靶向生物科技有限公司 一种与食道癌驱动基因突变相关的抗原肽组合及其应用

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CA2120507A1 (fr) * 1991-10-18 1993-04-29 Alban J. Linnenbach Variants solubles de proteines membranaires de type 1 et methodes d'utilisation
BRPI9809391B8 (pt) * 1997-04-14 2021-05-25 Amgen Res Munich Gmbh processo para a produção de um receptor de antígeno anti-humano, anticorpo humano e composição farmacêutica

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Title
See references of WO2004106917A2 *

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WO2004106917A3 (fr) 2005-04-28
WO2004106917A2 (fr) 2004-12-09

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