EP4526428A1 - Micro-impression d'anticorps et de biomolecules pour le phenotypage et l'activation cellulaires - Google Patents
Micro-impression d'anticorps et de biomolecules pour le phenotypage et l'activation cellulairesInfo
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- EP4526428A1 EP4526428A1 EP23723218.6A EP23723218A EP4526428A1 EP 4526428 A1 EP4526428 A1 EP 4526428A1 EP 23723218 A EP23723218 A EP 23723218A EP 4526428 A1 EP4526428 A1 EP 4526428A1
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/06—Animal cells or tissues; Human cells or tissues
- C12N5/0602—Vertebrate cells
- C12N5/0634—Cells from the blood or the immune system
- C12N5/0636—T lymphocytes
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- 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
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54386—Analytical elements
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- 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
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6854—Immunoglobulins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- C12N2500/00—Specific components of cell culture medium
- C12N2500/50—Soluble polymers, e.g. polyethyleneglycol [PEG]
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- C12N2501/00—Active agents used in cell culture processes, e.g. differentation
- C12N2501/50—Cell markers; Cell surface determinants
- C12N2501/51—B7 molecules, e.g. CD80, CD86, CD28 (ligand), CD152 (ligand)
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- C12N2501/00—Active agents used in cell culture processes, e.g. differentation
- C12N2501/50—Cell markers; Cell surface determinants
- C12N2501/515—CD3, T-cell receptor complex
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- C12N2501/00—Active agents used in cell culture processes, e.g. differentation
- C12N2501/50—Cell markers; Cell surface determinants
- C12N2501/599—Cell markers; Cell surface determinants with CD designations not provided for elsewhere
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N2533/00—Supports or coatings for cell culture, characterised by material
- C12N2533/30—Synthetic polymers
- C12N2533/40—Polyhydroxyacids, e.g. polymers of glycolic or lactic acid (PGA, PLA, PLGA); Bioresorbable polymers
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- C12N2537/00—Supports and/or coatings for cell culture characterised by physical or chemical treatment
- C12N2537/10—Cross-linking
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
- G01N2333/70503—Immunoglobulin superfamily, e.g. VCAMs, PECAM, LFA-3
- G01N2333/7051—T-cell receptor (TcR)-CD3 complex
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
- G01N2333/70503—Immunoglobulin superfamily, e.g. VCAMs, PECAM, LFA-3
- G01N2333/70514—CD4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
- G01N2333/70503—Immunoglobulin superfamily, e.g. VCAMs, PECAM, LFA-3
- G01N2333/70517—CD8
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
- G01N2333/7056—Selectin superfamily, e.g. LAM-1, GlyCAM, ELAM-1, PADGEM
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
- G01N2333/70596—Molecules with a "CD"-designation not provided for elsewhere in G01N2333/705
Definitions
- the invention generally relates to the field of quantification of the expression of membrane molecules and cellular functions.
- the invention relates more particularly to a functional test for clinical immunology.
- lymphocyte functions in particular flow cytometry, lymphocyte proliferation and the production of cytokines.
- a “CD45 antibody” will designate the antibody targeting the marker designated by “CD45” in the nomenclature of classes or “clusters” of differentiation.
- a “CDx antibody” where x is a natural number, such that CDx belongs to the nomenclature of “clusters” of differentiation will designate an antibody targeting the family of membrane glycoproteins or marker or antigen or membrane antigen designated by “CDx”.
- membrane protein for a cell will mean any glycoprotein present on the external surface of the cell and capable of forming a bond, with a specific antibody, in particular:
- CD3 is a membrane protein as described in the document “A novel Leukocyte Adhesion Deficiency III variant: Kindlin 3 defect results in integrin and non-integrin related defects in different steps of leukocyte adhesion” (Philippe Robert, J Immunol May 1, 2011, 186 (9) 5273-5283; DOI: https://doi.org/10.4049/jimmunol.1003141)
- CD4 is a membrane protein as described in the document “A microfuidic device for practical label -free CD4+ T cell counting of HIV-infected subjects. » (Xuanhong Cheng-Lab on a chip 2007, Volume 7 Issue 2 170-178 doi: 10.1039/b612966h).
- the membrane protein will be a membrane protein for adhesion to the substrate, the adhesion in question then being measured by the energy of the antigen-antibody bond and such as to maintain the cell at a distance from a substrate equal to the length of the antigen-antibody bond and have a detectable optical effect.
- Antigen-antibody binding energy is generally measured by the terms “affinity” or binding stability by “avidity” for multivalent antigens and antibodies.
- antibody designates both a specific antibody and one having cross-reactivity, both monovalent and multivalent; that is to say any known antibody capable of being deposited on a biocompatible substrate and of binding to a membrane protein.
- the name antibody within the meaning of the present application may be understood to mean molecules which are not designated by "antibodies” in the prior art but which are capable of assemble to another molecule by a protein domain coming from an antibody, for example in the case of CAR T cells which adhere to their ligand via a chimeric antibody domain.
- the antigen-antibody bonds considered in the present application are those which maintain the antigen fixed in the antibody site and which are, according to the prior art, of non-covalent nature. This includes hydrogen bonds, electrostatic bonds, Van der Waals forces and hydrophobic bonds. Multiple bonds between the antigen and the antibody ensure a stable interaction between these two molecules and those considered in the present request, are those which make it possible to physically maintain the cell at a fixed distance from a substrate and therefore to use physical means to detect the presence of the cell in the vicinity of the substrate, in particular optically.
- interferential optical reflection or “interferential reflection contrast microscopy” designate in the present application the technique known in English by the acronym IRM (Interferential Reflection Microscopy).
- the present application relates to a device which comprises a substrate comprising a first zone on which a protein capable of binding to a first membrane molecule is adsorbed and comprising a second zone on which an antibody targeting a second membrane molecule is adsorbed, in which the first zone and the second zone extend together in length over a dimension comparable to the length of a cell.
- the present application relates to a device characterized in that it comprises a substrate, the substrate comprising a first zone on which is adsorbed a protein capable of binding specifically to a cell by interacting with a first membrane molecule and comprising a second zone on which is adsorbed an antibody targeting a second membrane molecule expressed on the surface of said cell, said first zone representing a first surface defining a first area A1, said second zone representing a second surface, defining a second area A2, where l The total area represented by the sum of areas Al and A2 is less than or equal to the area of the projected surface of said cell in suspension ( Figure 1).
- the device comprises two zones which are organized so that a cell can interact with the first zone, or the second zone, or both zones simultaneously.
- the objective is to detect the covering of the first zone or the second zone or both zones and thus to phenotype the cell determined using the protein and the antibody each adsorbed respectively on the first and the second zone.
- the first and the second zone have a particular configuration so that the total area corresponding to the sum of the area of the first and the second zone is less than or equal to the area of the projected surface of said cell.
- said cell is capable of recognizing the protein adsorbed on the first zone, said cell will adhere to it, which will form a contrast in an optical microscope by contrast interference in reflection in the first zone which will appear dark, the second zone remaining clear in appearance ( Figure 2B).
- said cell having interacted with the first zone is capable of interacting with the antibody adsorbed on the second zone, the cell adhering to the first zone will spread over the second zone to adhere there, which will form a contrast in an optical microscope by contrast in reflection (which is a possible mode of revealing the signal generated by the device) in the second zone which will also appear dark (Figure 2C).
- Figure 2A Figure 3
- projected surface of a suspended cell we mean in the invention the plane defined by the largest dimensions of a cell when the latter is observed from above.
- the projected surface will be the disk of radius r, r being the radius of the perfect sphere.
- the projected surface will then have an area 7ir 2 and total area (A1+A2) will be less than 7ir 2 .
- Length being the largest dimension of a two-dimensional or three-dimensional geometric shape (as opposed to width and height).
- a two-dimensional shape has an area less than or equal to its length squared; a three-dimensional shape has a projected area less than or equal to its length squared.
- the device can be made with different geometric shapes, it is defined in the invention according to the length of the cells with which the device is likely to interact. In other words, we will define the device and the zones it contains according to the cell considered.
- the cells in suspension correspond either to cells which spontaneously are non-adherent (blood or hematopoietic cells), or adherent cells which have been detached from their support (for example by treatment with trypsin).
- the first membrane molecule is a membrane molecule common to a first type of cells and in which the second membrane molecule is a membrane molecule common to a subtype of the first type of cells.
- the first membrane molecule is a membrane molecule common to a first type of cells and in which the second membrane molecule is a membrane molecule common to a second type of cells capable of interacting with the first type of cells.
- the protein is an antibody targeting CD4 and the antibody is an antibody targeting CD8.
- the protein is an antibody targeting CD3.
- the antibody is an antibody targeting CD69.
- the antibody is an antibody targeting CD25.
- the antibody is an antibody targeting CD107.
- the antibody is an anti-collagen antibody.
- the antibody is an antibody targeting CD86.
- the device makes it possible, via the protein adsorbed on the first zone, to identify a cell, and the antibody adsorbed on the second zone also makes it possible to identify the cell, for example to confirm its phenotype.
- An example of this device comprises absorbed on the first zone a protein which is an antibody targeting the CD3 antigen and the antibody adsorbed on the second zone is an antibody targeting any one of the CD4 or CD8 antigens, or a mixture of those -this.
- the device makes it possible, via the protein adsorbed on the first zone, to identify a cell, and the antibody adsorbed on the second zone makes it possible to activate the cell, for example to induce a new cellular function, or even induce cellular differentiation.
- a device examples include:
- the protein adsorbed on the first zone is an antibody targeting the CD45RO antigen and the antibody adsorbed on the second zone is an antibody targeting the CD3 antigen, or a mixture of antibodies targeting the CD3 antigen and the CD28 antigen , Or
- the protein adsorbed on the first zone is an antibody targeting the CD56 or CX3CR1 antigen and the antibody adsorbed on the second zone is an antibody targeting the CD20 antigen (rituximab), or ii - the protein adsorbed on the first zone is an antibody targeting the CD 14 antigen and the antibody adsorbed on the second zone is an antibody targeting any of the CD 16, CD32 or CD64 markers, or targeting membrane lipopolysaccharides (LPS).
- LPS membrane lipopolysaccharides
- the device allows, via the protein adsorbed on the first zone, to activate a cell, and the antibody adsorbed on the second zone makes it possible to detect a cellular response in the form of expressed membrane molecules, such as of activation or senescence, i.e. read this answer.
- a cellular response in the form of expressed membrane molecules such as of activation or senescence
- the protein adsorbed on the first zone is CD 19 or a chimeric protein comprising CD 19 and the antibody adsorbed on the second zone is an antibody targeting any of the antigens CD69, CD107, CD25, CD57, TIM-3 and LAG -3, or - the protein adsorbed on the first zone is an antibody targeting the CD20 antigen (rituximab) and the antibody adsorbed on the second zone is an antibody targeting the CD107 antigen.
- the device makes it possible, via the protein adsorbed on the first zone, to identify a cell, and the antibody adsorbed on the second zone makes it possible to detect a cellular response in the form of expressed membrane molecules, such as of activation or senescence, i.e. read this answer.
- a cellular response in the form of expressed membrane molecules such as of activation or senescence
- An example of such a device is such that the protein adsorbed on the first zone is CD 19 and the antibody adsorbed on the second zone is an antibody targeting any one of the antigens CD69, CD 107, CD25, CD57, TIM- 3 and LAG-3.
- a device as defined above is also described, in which the first membrane molecule is a membrane molecule expressed on the surface of a first cell type and in which the second membrane molecule is a membrane molecule expressed on the surface of a subtype of said first cell type, said subtype of said first cell type expressing on its surface said first and said second membrane molecules.
- the present application also relates to a process which comprises the following steps:
- the present application also relates to a variant of the method for quantifying and monitoring the kinetics of cell activation, which comprises the following steps:
- the present application also relates to a variant of the method for selecting a cell type and for triggering its activation, which comprises the following steps: - adsorb on a substrate a protein capable of binding to a first membrane molecule common to a first type of cells, in a first zone of subcellular dimensions,
- the present application also relates to a variant of the method for detecting cell membrane molecules, which comprises the following steps:
- the present application also relates to a variant of the method for detecting an interaction of two cells, which comprises the following steps:
- a substrate to characterize the state of activation or differentiation of a specific cell in a population of cells
- said substrate comprising a first zone on which a protein is adsorbed capable of binding specifically to said determined cell by interacting with a first membrane molecule specific to said determined cell and comprising a second zone on which is adsorbed an antibody targeting a second membrane molecule expressed on the surface of said determined cell, said first zone representing a first surface defining a first area Al, said second zone representing a second surface, defining a second area A2, where the total area represented by the sum of the areas Al and A2 is less than or equal to the area of the projected surface of said cell in suspension, said second membrane molecule being expressed on the surface of said determined cell when said cell is activated or differentiated.
- the invention is based on a method which makes it possible to analyze phenotypically and at the single cell level, in particular the activation properties of immune cells as illustrated in Figures 1 to 5
- the method can use optical microscopy to generate multiple micropatterns of different proteins and subcellular sizes ( Figure 3), and these microengineered substrates are capable of performing multiple functional assays on suspensions of immune cells or whole blood, such as (i) selecting/identifying a cell type of interest, (ii) triggering an activation signal, and (iii) reading the kinetics of activation immune.
- the invention is not limited to such optical microscopy, and any instrument projecting ultraviolet rays (for example a confocal microscope) or any (micro-)imprinting technique can also be used. A person skilled in the art will be able to determine the most appropriate instrumentation.
- micropattern proteins which are generally antibodies with specific affinities and effective actions.
- the cell membrane of the suspension expresses the antibody target on the substrate, the cell spreads over the corresponding pattern ( Figure 2) and the imprint of cell adhesion can be detected by interferometric microscopy ( Figure 2).
- Detection is not limited to reflection interference contrast imaging, and detection by transmission imaging and image collection to detect cell outline can also be used.
- those skilled in the art will be able to determine which technique is most appropriate.
- micropattern The different functions performed by the micropattern can be evaluated by taking a single image and analyzing the spread of cells in each pattern. Importantly, reading does not require any of the tedious manipulations usually involved in immunostaining-based techniques (cell preparation, incubations, rinsing). In a typical interference microscopy image, dark areas indicate adhesion and light areas non-adhesion ( Figure 2 and 3). In practice, the operator's tasks are limited to placing the smart substrate on a dedicated optical microscope and depositing the cell sample on the substrate.
- Figure 1 in A, example of a printed pattern shown in plan at the top, and in section at the bottom.
- the pattern has two concentric zones (1 and 2) each carrying an antibody of a particular specificity, in the example CD3 in the center (1) and CD69 in the periphery (2).
- B example of a circulating cell (a T lymphocyte) represented at the same scale, of which a membrane marker is represented on its surface (CD3 here), which would be likely to interact with the central zone of the pattern.
- the largest dimension of the pattern (10pm) is less than that of the cell (12pm).
- Figure 2 examples of interactions of different cells with a pattern identical to that of Figure 1, with a side view at the top, and at the bottom a plan view of the signal obtained in interference contrast in reflection (which is a possible mode revealing the signal generated by the device).
- A example of interaction between a cell not carrying a membrane marker corresponding to the specificities of the antibodies present.
- a B lymphocyte (whose marker CD20 is shown) does not express a membrane ligand to interact with the pattern antibodies and does not adhere to the surface; the resulting appearance in interference contrast in reflection is an absence of signal.
- B example of interaction between a cell carrying a single type of membrane marker corresponding to one of the specificities of the antibodies present on the pattern.
- An unactivated T cell expresses CD3 but not CD69.
- CD3 molecules are captured by antibodies in the central area of the pattern, and its membrane therefore adheres to this zone. This causes the appearance of the interfering contrast! el for the central area of the pattern.
- C example of interaction between a cell carrying the two types of membrane markers corresponding to the specificities of the two types of antibodies present on the pattern.
- CD3 molecules are captured by the antibodies in the central area of the pattern, and its CD69 molecules are captured by the antibodies present in the peripheral area of the pattern; its membrane therefore adheres to both areas. This causes the appearance of interference contrast for the central zone and the peripheral zone of the pattern.
- Figure 3 Examples of real images obtained during an experiment carried out with the type of pattern described in Figures 1 and 2, repeated to form an array of patterns on a glass slide.
- A transmission light microscope image, showing T cells each adhered to a pattern location in the matrix. Some locations did not capture a cell.
- B appearance resulting in interference contrast in reflection at the same magnification showing that each cell having adhered to a pattern in A produces a contrast on the central area of the pattern in B, identifying each cell as expressing CD3 on its surface and therefore being a cell T.
- a portion of the cells produces a more or less complete contrast on the peripheral zone of the pattern to which it adheres, identifying these cells as expressing CD69 on their surface and therefore as activated T cells.
- Figure 4 examples of possible patterns with two zones, each carrying a type of antibody with a particular specificity (identical to the patterns described in Figures 1 and 2).
- the total dimensions of the pattern remain less than 10 pm, which is less than the suspended dimension of the targeted cell type (here, leukocytes).
- Figure 5 examples of a pattern with three zones, each carrying a type of antibody with a particular specificity. The total dimensions of the pattern remain less than 10 pm, which is less than the suspended dimension of the targeted cell type (here, leukocytes).
- the invention can be carried out for the substrate by means of LIMAP technology which makes it possible to align and adsorb proteins on substrates covered with a PEG (Polyethylene Glycol) brush exposed in an ultraviolet light pattern, which makes it possible to obtain specific adhesion of a protein in the exposed areas.
- LIMAP LIMAP technology
- PEG Polyethylene Glycol
- a first zone (1) is printed locally by the combined action of a photo-initiator (PLPP, Alvéole), placed in solution on a PEG-SVA brush and subjected to a projection of an ultraviolet pattern at 375 nm (step 1).
- a first antibody is then incubated for 12 hours at 4°C (step 2).
- a second zone (2) is printed by LIMAP (step 3).
- a second antibody is deposited there then incubated for 12 hours, at 4°C (step 4).
- the second antibody adsorbs non-specifically to the second zone (i.e. not limited to the most recently illuminated pattern), because it is also adsorbed in the first zone.
- the anti-fouling substrate (PEG brush) is in fact made adhesive in the first zone by the first illumination and in the second zone by the second illumination, which implies for the second antibody to adsorb not only in the second zone but also in the first zone. Verification of these properties can be done for example by epifluorescence, using distinct fluorescence markers for the antibodies and observing them using interference filters isolating the wavelength of each fluorescence marker.
- the best passivation solution found is PEG-SVA at 0.23 mg/ml of lOmM baking soda in Milli-Q water for 15 minutes at room temperature.
- LIMAP technology can be used to produce a periodic pattern comprising two potential adhesion zones for cells: one specific for T lymphocytes as a whole and one for activated T cells. It will also be possible to create as many adhesion zones as necessary by illuminating each zone, exposing it to an antibody chosen for the zone, then passivating then illuminating the next zone and so on.
- the zone taken as a pattern of a spatially periodic structure will be duplicated in a spatially periodic manner, by shifting the pattern on the substrate to allow deposition of the same antibody and passivation in a single operation, of all the illuminated patterns.
- the duplication will be carried out conveniently, in a known manner, by LIMAP technology, in which a matrix of micro-mirrors is used to produce the periodic pattern and is imaged on the substrate in ultraviolet light, in one go.
- each antibody is only adsorbed in its zone, i.e. in a manner specific to this zone, the antibodies are adsorbed in contiguous zones forming a pattern of length, that is to say of larger geometric dimension, comparable, i.e. that is to say less than or equal to the length (i.e. again the largest of the geometric dimensions) of the cell to be adhered and with patterns spaced so that a single cell can adhere to each pattern.
- a pattern of length that is to say of larger geometric dimension, comparable, i.e. that is to say less than or equal to the length (i.e. again the largest of the geometric dimensions) of the cell to be adhered and with patterns spaced so that a single cell can adhere to each pattern.
- Those skilled in the art will be able to adapt, through simple execution operations, the shape, the length of each zone and the distance between the patterns to ensure, for a particular type of cell, that only one cell adheres per pattern and in a given order of adhesion or a given spatial configuration of adhesion.
- aCD45RO type (“antibody targeting CD45RO”) delimited inside a circle
- a second adhesion zone of the aCD69 type (“antibody targeting CD69”) delimited on a circular ring concentric with the first zone.
- a first adhesion zone of the aCD45RO type (“antibody targeting CD45RO”) mixed with aCD3 and aCD28 to make all the memory T lymphocytes adhere (all expressing CD45RO) then trigger the activation of the cells having adhered (by CD3+CD28), the first zone still being delimited inside a circle and the same second zone of aCD69 type adhesion (“antibody targeting CD69”) delimited on a circular ring concentric with the first zone to adhere only activated memory T lymphocyte cells which specifically express CD69.
- the device of the invention can therefore be used in a versatile manner either statically for phenotyping activated memory T lymphocytes, or dynamically for monitoring activation of naive memory T lymphocytes by adding to a common adhesion antibody to all memory T cells, a memory T cell antibody.
- Such a device can be adapted without difficulty to any type of cell that can be activated.
- This size is of the order of a few micrometers, for example from 4pm to 12.5pm to cause the adhesion of a single immune cell.
- the CD45 antibody or a CD45/CD3/CD28 mixture of antibodies as long as it causes non-specific adhesion of any activated T lymphocyte. or not activated, in particular memory T lymphocytes.
- each second zone the CD69 antibody or a mixture of antibodies containing it such as CD69+CD25 or a third contiguous zone containing CD25, as long as it causes the specific adhesion of all activated T lymphocytes, in particular memory T lymphocytes. It will also be possible to deposit only CD25, to observe secondary T lymphocyte activation rather than primary activation (i.e. temporally preceding the secondary) with CD69 or rather than both with CD69+CD25. We can follow the activation kinetics in a known manner using MRI microscopy, the light zones revealing non-adhesion, which implies that the non-activated T lymphocytes will have a first dark zone and a second zone which is even lighter. that adhesion will be weak or their distance from the substrate will be strong or that their activation will be weak.
- the shape of the area printed or deposited or covered with an antibody may be contained in a circle or in a ring.
- a pattern suitable for the first zone is a disc and a pattern suitable for the second zone is a ring concentric with the disc, both of maximum dimension equal to around ten microns.
- adhesion on the ring of a pattern is synonymous with activation of the T lymphocyte captured on the pattern and the absence of adhesion on the ring is characteristic of a non-activated T lymphocyte.
- the appearance of the ring of a pattern is synonymous with activation of the T lymphocyte captured on the pattern and the absence of appearance of the ring is characteristic of a non-activated T lymphocyte.
- a first antibody allowing the adhesion of any T lymphocyte, activated or non-activated (i.e. an antibody not specific for lymphocytes activated T lymphocytes) then to deposit in a second micrometric zone a second antibody allowing the adhesion of any activated T lymphocyte (i.e. an antibody specific for activated T lymphocytes)
- the invention therefore makes it possible to monitor in real time, from the start of an infection or a transplant, the activation of the immune functions of T lymphocytes.
- the CD20 antibody could be used in place of the CD45RO antibody.
- non-limiting and in particular, non-concentric zones may be in the teaching of the present application for certain types of cells.
- the present application thus describes a widely distributed and easily adaptable tool for the study of various cells and their states, in a quantitative and qualitative manner with a test that can be carried out with only a microscope equipped for MRI for the observation of the results and conventional means of preparing cells either without a particular state or with.
- This tool can be used in particular as new clusters of differentiation and their associated antibodies are discovered.
- the invention is capable of industrial application in the field of tests for clinical immunology and oncology, in the field of cellular tests for pharmaceutical research, and in the field of cellular tests for fundamental research.
- the invention is intended to carry out cellular phenotyping tests.
- an antibody targeting CD3 can be deposited in a mixture with an antibody targeting CD28 in a first zone, an antibody targeting CD4 in a second zone, an antibody targeting CD8 in a third zone, an antibody targeting CD69 in a fourth zone.
- the antibody targeting CD69 could be replaced by an antibody targeting CD25 or a fifth zone could be added with the antibody targeting CD25.
- an anti-CD 16 antibody can be deposited in a first zone, an antibody targeting CD56 in a second zone, and an antibody targeting CD 107 in a third zone.
- an anti-CD 16 antibody can be deposited in a first zone, an antibody targeting CD 14 in a second zone, and an antibody targeting CD86 in a third zone.
- the antibody targeting CD16 could be replaced by an antibody targeting CD32.
- the invention aims to carry out cellular activation tests during intercellular interactions.
- an anti-CD 14 antibody can be deposited in a first zone and an antibody targeting CD69 in a second zone.
- the antibody targeting CD69 could be replaced by an antibody targeting CD25.
- CD 16 known to bind K562 target cells, can be deposited in a first zone and an antibody targeting CD 107 in a second zone.
- the invention can be completed by adding one or more zones each containing a protein targeting a membrane molecule or an antibody targeting a membrane molecule of a cell type selected by the zones of the modes described above. .
- Application example 1 Substrates selecting lymphocytes, without substrate activation and with substrate activation readout.
- APTS (200pL/slide): in milliQ water + 1% (3-aminopropyl) triethoxysilane (APTS) (ref A3648 Sigma-Aldrich) + 0.03% acetic acid 196pL milliQ water + 2p acetic acid 3 % + 2pL APTS
- PEG-SVA solution (10pL/well): milliQ water, lOmM of carbonate buffer at pH 8.5 and 23% PEG-SVA (mPEG-SUCCINIMIDY VALERATE MW 5000Da, ref: 109681 INTERCE1IM).
- PEG-SVA mPEG-SUCCINIMIDY VALERATE MW 5000Da, ref: 109681 INTERCE1IM.
- final solution 36pL milliQ water, 4pL of 100mM carbonate buffer and 0.0092g of PEG S VA
- Anti-CD3-CD28 Antibody Deposition at respectively 100pg/ml-100pg/ml-50pg/ml (final volume 20pl/well) For one well: 2pl of CD3 and CD28, Ipl CD45, 15pl of PB S
- Anti-CD69 Antibody Deposition at 1OOpg/ml (final volume 20 ⁇ l/well)
- Anti hCD45 Ab ref NBP2-34804, clone SPM570, NovusBio
- Anti hCD3 Ac Ultra leaf purified, ref 300438, clone UCHT1, Biolegend
- Anti hCD28 Ac Ultra leaf purified, ref 302933, clone CD28.2, Biolegend
- Anti hCD69 ac ref MAB2359, clone 298633, R&D system.
- Application example 2 Substrates selecting and identifying memory T lymphocytes, with activation by the substrate and readout of activation by the substrate.
- Figure 3 gives an example of measurement in a device with micropatterns designed to accommodate single T cells and to detect their activation by the TCR complex. These patterns were composed of two distinct zones, each with a specific function: the central zone contained anti-CD3 antibody and anti-CD28 antibody to select and activate T cells, and the side zone contained anti-CD69 antibody to read CD69 expression of activated cells. The interferometric reading is shown in Figure 3B, right. We can see that some anti-CD69 areas are dark, which means that these cells Captured T cells are activated in this experiment (confirmed by immunofluorescence).
- This example illustrates the concept of "smart" substrates featuring multiple antibodies, which is very flexible and adaptable to different applications and cell types by choosing the printed antibodies accordingly.
- the technology described in the present invention allows functional assays allowing personalized use of new immunotherapies by monitoring the activation of immune cells. Evaluating the effectiveness of immunotherapies and stratifying patients as potential responders can optimize the use of these expensive treatments. This is an important medical issue. Functional explorations are most often too slow and too complex to be translated into clinical contexts where the costs of human manipulation and expertise are very restrictive, and remain the domain of academic research.
- the technology developed by the inventors of "smart" substrates with multiple functional micropatterns makes it possible to measure leukocyte activation in a few hours and can effectively address an unmet need for the development of rapid, clinically accepted functional assays.
- Table 1 Antibodies and proteins relevant to micropatterns capable of carrying out specific functions (identification, selection, activation, stimulation, response reading) with different cell types.
- glass slides (SCHOTT Nexterion) are treated with plasma for 15 minutes and mounted with a PDMS mold (P olydimethyl siloxane, Sylgard 184) so as to obtain channels.
- PDMS mold P olydimethyl siloxane, Sylgard 184
- a solution of APTES ((3-Aminopropyl)triethoxysilane, Sigma) diluted to 1% in milliQ water with 0.03% acetic acid is incubated on the glass for 2 hours at 4°C. The surface is then rinsed with water and placed for 15 minutes at 95°C.
- a solution of PEG-SVA (MW: 5000 Da, INTERCHIM) in a carbonate buffer (NaHCO3) at 10 mM is then incubated on the glass for 12 hours at 4°C.
- the canal is then rinsed with water and a solution of PLPP (15.5 mg.mL-1, Alveole) is introduced into the canals and agitated using a syringe pump (NEMESYS, Cetoni) with a flow of 4pL.s -1 during the entire insolation.
- the surface is exposed with a UV dose of 3000 mJ.mnr 2 to create the attachment pattern via the PRIMO platform (Alveole), then incubated with
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| PCT/EP2023/063407 WO2023222842A1 (fr) | 2022-05-18 | 2023-05-17 | Micro-impression d'anticorps et de biomolecules pour le phenotypage et l'activation cellulaires |
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