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EP1999457A1 - Procede pour analyser des molecules ou des parties de molecules dans des echantillons biologiques - Google Patents

Procede pour analyser des molecules ou des parties de molecules dans des echantillons biologiques

Info

Publication number
EP1999457A1
EP1999457A1 EP07723151A EP07723151A EP1999457A1 EP 1999457 A1 EP1999457 A1 EP 1999457A1 EP 07723151 A EP07723151 A EP 07723151A EP 07723151 A EP07723151 A EP 07723151A EP 1999457 A1 EP1999457 A1 EP 1999457A1
Authority
EP
European Patent Office
Prior art keywords
sample
light
bleaching
fluorescence
marker
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Withdrawn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
EP07723151A
Other languages
German (de)
English (en)
Inventor
Lars Philipsen
Ansgar J. Pommer
Raik BÖCKELMANN
Bernd Bonnekoh
Harald Gollnick
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.)
MPB Meltec Patent und Beteiligungs GmbH
Original Assignee
MPB Meltec Patent und Beteiligungs 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 MPB Meltec Patent und Beteiligungs GmbH filed Critical MPB Meltec Patent und Beteiligungs GmbH
Publication of EP1999457A1 publication Critical patent/EP1999457A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0071—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by measuring fluorescence emission
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/41—Detecting, measuring or recording for evaluating the immune or lymphatic systems
    • A61B5/414—Evaluating particular organs or parts of the immune or lymphatic systems
    • A61B5/415—Evaluating particular organs or parts of the immune or lymphatic systems the glands, e.g. tonsils, adenoids or thymus
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/44—Detecting, measuring or recording for evaluating the integumentary system, e.g. skin, hair or nails
    • A61B5/441—Skin evaluation, e.g. for skin disorder diagnosis
    • A61B5/443—Evaluating skin constituents, e.g. elastin, melanin, water

Definitions

  • the invention relates to a method for the determination of molecules, groups of molecules and / or parts of molecules in biological samples, d.
  • H Samples of human, animal, plant or microbial origin.
  • fiororophore-labeled antibodies for the histo- and cytochemical examination of cells.
  • the fluorophore-labeled antibodies react specifically with antigens that are expressed on the surface of certain cells. Cells carrying such antigens are thus labeled with the fluorophore via the antibody.
  • the fluorophores When the fluorophores are exposed to adequate excitation light, the fluorophores are excited to emit photons, which can be measured by a photodetector.
  • fluorescent labels coupled not only to antibodies but also to other detector molecules such as lectins, nucleic acids, inorganic or organic molecules, probes and other ligands are used to analyze biological samples. Accordingly, the following statements apply mutatis mutandis not only for antibodies, but also for analogous applications with other detector molecules such as lectins, nucleic acids, inorganic or organic molecules or probes and other ligands.
  • Image analysis methods are known from the prior art with which the disturbing autofluorescence can be largely or completely removed from multispectral images. With strong autofluorescence of the samples or unfavorable superimposition of the autofluorescence with the fluorescence of the added markers, however, this can lead to significant signal information being lost.
  • the object of the invention is to eliminate the disadvantages of the prior art.
  • a method for the determination of molecules, groups of molecules and / or parts of molecules in biological samples is to be specified, which is particularly suitable for the investigation of skin tissue of human or animal origin and blood preparations.
  • a method for the determination of molecules, groups of molecules and / or parts of molecules is provided in biological samples, comprising at least one time displacement of the sample with at least one light emitting marker and measuring the light emission of the marker, wherein prior to measuring the light emission of the marker, the light emission inherent in the sample is reduced or eliminated by bleaching becomes.
  • the bleaching of the sample should be done before applying the light-emitting label.
  • the invention is based on the finding that by means of a bleaching step, the light emission inherent in the sample can be reduced or eliminated.
  • the bleaching step is carried out before the first application of a light-emitting marker. Due to the reduction or elimination of the inherent light emission, the light spectrum emitted by the marker after application thereof is not affected by light emissions originating from sources other than the markers. It has surprisingly been found in the experiments carried out according to the invention that the minimization or elimination of autofluorescence and nonspecific fluorescence in cell and tissue samples including tissue sections can advantageously be achieved by repeated soft bleaching, and in particular useful in the analysis of skin tissue samples; see also the following examples.
  • the biological sample is subjected to repeated soft bleaching, i.
  • the bleaching is preferably carried out with light whose wavelength range corresponds to the excitation wavelength of the marker (s) used, such as the wavelength of 488 nm in the case of FITC; see also the following examples.
  • the method of the present invention autofluorescence and specific fluorescence in cell and tissue samples can be achieved within a relatively short time by means of three bleaching steps with light of two wavelengths, i.
  • inherent light emission is understood to mean the emission of light by constituents of the sample without the addition of light-emitting substances to the sample have been.
  • the sample's inherent light emission includes autofluorescence as well as nonspecific fluorescence of the sample, but also any other perturbing light emissions such as fluorescence originating from the coating material of a slide or from substances used for sample fixation.
  • inherent fluorescence used hereinafter is understood to mean the emission of light by constituents of the sample without fluorescence-emitting substances having been added to the sample.
  • the fluorescence inherent in the sample includes autofluorescence as well as nonspecific fluorescence of the sample, but also any other interfering light emissions such as fluorescence originating from the coating material of a slide or from substances used for sample fixation.
  • bleaching is meant the destruction of the fluorophores contained in the sample.
  • destroying the fluorophores involves destroying the fluorophore groups of molecules of the sample which cause the inherent light emission or inherent fluorescence.
  • a biological sample is understood to mean samples of human, animal, plant or microbial origin.
  • microbial derived from the term
  • Merobes includes the entire spectrum of microorganisms including bacteria, viruses, fungi, mono- and multicellulars, algae, blue-green algae as well as
  • Prions see Pschyrembel, KHn. Wörterbuch, 259th edition, de Gruyter Berlin - New York
  • the sample can be, for example, tissue or liquids, such as
  • Blood, lymph or secretions act as well as preparations made from them.
  • blood preparations such as cell preparations of mononuclear cells
  • Lymphocytes, monocytes, granulocytes, platelets and erythrocytes from the blood to be examined by the method according to the invention thus enables the examination of samples which have a strong autofluorescence.
  • the method is therefore particularly suitable for the fluorescence analysis of autofluorescent tissue samples or autofluorescent cell cultures of human or animal origin. Fluorescence analysis of autofluorescent cell cultures involves fluorescence analysis of adherent cells as well as suspension cells.
  • the method according to the invention is particularly suitable for fluorescence analysis of human or animal skin tissue.
  • the inherent fluorescence of a sample is eliminated or reduced according to the invention by bleaching the sample.
  • the bleaching is carried out so that the binding sites for the fluorophore-labeled markers which are applied to the biological sample after bleaching according to the invention are not destroyed.
  • the bleaching of the sample should be done before applying the fluorophore-labeled label.
  • the bleaching of the samples is performed by irradiating the sample with light.
  • the wavelength of the light is chosen so as to destroy the functional groups of molecules of the sample which cause their inherent fluorescence.
  • a light-emitting marker is to be understood as meaning a fluorophore-labeled marker.
  • Fluorophore-labeled markers include, for example, fluorophore-labeled antibodies, lectins, nucleic acids, probes and other binding molecules.
  • the fluorophore-labeled label can be any type of fluorophore, but preferably the fluorophore is selected from the group consisting of fluorescent nanoparticles (quantum dots) and fluorochromes.
  • the bleaching is carried out until the signal intensity of the inherent fluorescence has been reduced to a predetermined level.
  • the sample can be exposed to the light of a specific wavelength for a given period of time.
  • the bleaching according to the invention can be repeated several times. This is particularly advantageous if it is not known what time of exposure of the light is required to reduce the signal intensity of the inherent fluorescence to a predetermined level. In this case, it is preferred that several bleaching cycles be performed, each bleaching cycle comprising bleaching the sample for a predetermined period of time and measuring the signal strength of the residual inherent fluorescence.
  • the light used to bleach the sample is preferably generated by the excitation light source of an inverted or upright fluorescence microscope.
  • the light source may in particular be a mercury-vapor lamp, halogen lamp, xenon lamp, a laser, a light-emitting diode, in each case in single or multiple or combinations thereof.
  • the wavelength of the light used for bleaching in one embodiment of the invention, is chosen to be similar to the excitation wavelength of a fluorophore to be used as a marker. Alternatively, light having a wavelength range including the excitation wavelength of the fluorophore may also be selected.
  • By bleaching the biological sample with light corresponding to or including the wavelength of the fluorophore it is achieved that the inherent fluorescence of the sample excited by that wavelength is destroyed. If, after bleaching according to the invention, the fluorophore-labeled marker is applied to the sample which is excited at this wavelength, the measurement of the fluorescence is thus no longer disturbed by the inherent fluorescence of the sample.
  • the bleaching according to the invention preferably comprises bleaching with light whose wavelength range comprises all excitation wavelengths of the markers used.
  • the bleaching can also take place in n substeps by the action of light with the excitation wavelength of a first marker, then by the action of light with the excitation wavelength of an ith marker and finally by the action of light with the excitation wave of the nth marker.
  • the duration of bleaching depends on the time required to lower the inherent fluorescence of the biological sample below a predetermined level. Conveniently, several bleaching cycles are provided, wherein the duration of the individual bleaching step is preferably between 1 and 60 minutes, more preferably between 5 and 45 minutes, particularly preferably between 10 and 30 minutes.
  • the number of bleaching cycles should be chosen such that the fluorescence inherent in the biological sample which emits at a given excitation wavelength is preferably at most 10%, more preferably at most 3%, most preferably at most 0.3%, based in each case on fluorescence intensity. This also applies if only one bleaching step is carried out.
  • fluorescence measurements should first be carried out in order to determine an indication of the number of bleaching cycles required and the duration of a bleaching step.
  • the method is suitable for the preparation of samples to be analyzed by luminometry, microscopy, fluorescence microscopy, confocal microscopy, multi-epitope-ligand mapping (MELK), flow cytometry or fluorescence activated cell sorting (FACS).
  • MELK multi-epitope ligand cartography
  • fluorophore-labeled marker used here is a synonym for the term "fluorescence-labeled marker”.
  • the method according to the invention can be used in the practical or theoretical disciplines of medicine for diagnostic purposes or for the identification of new pathogenetic or therapeutic target structures or for therapy / medication monitoring.
  • Fig. Ia is a fluorescence micrograph of skin tissue (63-fold
  • FIG. 1b is a graph of the variation of autofluorescence.
  • Fig. 2 fluorescence microscopic images of lymphocytes.
  • the fluorescence micrograph of a skin tissue sample shown in Fig. Ia was obtained prior to carrying out the method according to the invention. It is a strong autofluorescence to detect.
  • the fluorescence intensity in FIG. 1 b is shown as a function of the number of bleaching cycles.
  • the dashed curve corresponds to the region of a hair follicle (hair follicle) of the epidermis bounded by dashed lines in FIG. 1 a
  • Ia bounds the epidermis of the skin tissue sample.
  • the ordinate shows the fluorescence intensity
  • the abscissa represents the number of bleaching cycles
  • the letters b and f used therein for image pick-up after bleaching are before bleaching.
  • the sample was prepared as follows: Biopsies of the skin tissue of patients suffering from psoriasis as well as healthy skin tissue were taken under local anesthesia. The biopsies had a diameter of 6 mm. After removal, the biopsies were snap frozen. Of the frozen biopsies, 5- ⁇ m thick sections were made by means of a cryotome. The sections were then air-dried at room temperature for 10 minutes, then immersed in acetone at room temperature for 10 seconds, dried again and finally stored at -20 ° C. Immediately prior to performing the method of the invention, the sections were dipped for 10 minutes for rehydration in PBS, pH 7.4.
  • the section to be examined ie, skin
  • a sample was applied to a slide and applied to the stage of an inverse wide field fluorescence microscope (Leica DM IRE2 with a xenon fluorescent excitation lamp) equipped with fluorescence filters for fluorescein isothiocyanate (FITC) and phycoerythrin (PE).
  • FITC fluorescein isothiocyanate
  • PE phycoerythrin
  • the sample should be examined using fluorophore-labeled antibodies. As fluorophores FITC and PE were chosen. The sample was examined as follows:
  • the sample obtained according to section A. was admixed in a known manner with a solution containing FITC-labeled antibodies, incubated and the solution containing FITC-labeled antibodies not bound to the sample was removed. Subsequently, the FITC-labeled antibodies bound to binding sites (antigens) on the sample were excited at 488 nm by the action of light and the emitted fluorescence radiation was measured (see FIG. 2C for FITC-labeled antiCD ⁇ antibodies). The obtained photograph shows for the first time the light emitted by added FITC without being influenced by the autofluorescence of the sample). After measurement, the antibody-bound FITC molecules were bleached. After bleaching, the sample may be spiked with other FITC-labeled antibodies in several cycles as described above to determine additional antigens on the sample.
  • the sample was spiked with a solution containing PE-labeled antibodies, incubated, and the solution, the PE-labeled antibodies not bound to the sample contained, removed. Subsequently, the PE-labeled antibodies bound to binding sites (antigens) on the sample were excited at 546 nm by the action of light and the emitted fluorescence radiation was measured. Again, several cycles with different PE-labeled antibodies can be performed.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Biomedical Technology (AREA)
  • Immunology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biophysics (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Optics & Photonics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Endocrinology (AREA)
  • Vascular Medicine (AREA)
  • Dermatology (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

L'invention concerne un procédé pour analyser des molécules, des groupes de molécules et/ou des parties de molécules dans des échantillons biologiques, ce procédé consistant à ajouter au moins une fois à l'échantillon au moins un marqueur émettant de la lumière et à mesurer l'émission de lumière de ce marqueur. Selon l'invention, l'émission de lumière inhérente à l'échantillon est réduite ou supprimée par blanchiment avant la mesure de l'émission de lumière du marqueur.
EP07723151A 2006-03-09 2007-03-09 Procede pour analyser des molecules ou des parties de molecules dans des echantillons biologiques Withdrawn EP1999457A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006010907A DE102006010907A1 (de) 2006-03-09 2006-03-09 Verfahren zur Bestimmung von Molekülen oder Molekülteilen in biologischen Proben
PCT/EP2007/002087 WO2007101706A1 (fr) 2006-03-09 2007-03-09 Procédé pour analyser des molécules ou des parties de molécules dans des échantillons biologiques

Publications (1)

Publication Number Publication Date
EP1999457A1 true EP1999457A1 (fr) 2008-12-10

Family

ID=38080900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07723151A Withdrawn EP1999457A1 (fr) 2006-03-09 2007-03-09 Procede pour analyser des molecules ou des parties de molecules dans des echantillons biologiques

Country Status (4)

Country Link
US (1) US20100120060A1 (fr)
EP (1) EP1999457A1 (fr)
DE (1) DE102006010907A1 (fr)
WO (1) WO2007101706A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008053270A1 (de) 2008-10-27 2010-05-12 Medizinische Hochschule Hannover Vorrichtung und Verfahren zur Analyse von Zellen
DE102008062372B3 (de) * 2008-12-17 2010-06-17 Medizinische Hochschule Hannover Nachweiskonjugat und Verfahren zur Analyse
US20110058728A1 (en) * 2009-08-28 2011-03-10 Petra Perner Device and Method for Automatic Detection of Dynamic Processes of Cells in Cell Samples
JP6716198B2 (ja) 2015-03-27 2020-07-01 シスメックス株式会社 検体分析方法および検体分析装置
DE102015005656A1 (de) * 2015-05-02 2016-11-03 Testo Ag Zytometrierverfahren und Zytometereinheit
WO2017001534A1 (fr) * 2015-06-30 2017-01-05 Imec Vzw Blanchiment de colorants au cours d'une détection luminescente

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4444317A (en) * 1981-08-26 1984-04-24 Georg Wick Observation of immunofluorescene for distinguishing between specific and nonspecific binding of conjugates
DE19709348C2 (de) * 1996-05-29 1999-07-01 Schubert Walter Dr Md Automatisches Multi-Epitop-Ligand-Kartierungsverfahren
JP3686898B2 (ja) * 2003-01-09 2005-08-24 独立行政法人理化学研究所 蛍光エネルギー移動解析装置
WO2005064319A1 (fr) * 2003-12-29 2005-07-14 Medical Research Council Identification de molecules uniques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007101706A1 *

Also Published As

Publication number Publication date
DE102006010907A1 (de) 2007-09-20
WO2007101706A1 (fr) 2007-09-13
US20100120060A1 (en) 2010-05-13

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