EP4330261A1 - Utilisation de dérivés de dicarbonate de fluoresceine comme marqueur cellulaire - Google Patents
Utilisation de dérivés de dicarbonate de fluoresceine comme marqueur cellulaireInfo
- Publication number
- EP4330261A1 EP4330261A1 EP22726115.3A EP22726115A EP4330261A1 EP 4330261 A1 EP4330261 A1 EP 4330261A1 EP 22726115 A EP22726115 A EP 22726115A EP 4330261 A1 EP4330261 A1 EP 4330261A1
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- Prior art keywords
- compound
- cells
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- cell
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D493/00—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system
- C07D493/02—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system in which the condensed system contains two hetero rings
- C07D493/10—Spiro-condensed systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/001—Preparation for luminescence or biological staining
- A61K49/0013—Luminescence
- A61K49/0017—Fluorescence in vivo
- A61K49/0019—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules
- A61K49/0021—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules the fluorescent group being a small organic molecule
- A61K49/0041—Xanthene dyes, used in vivo, e.g. administered to a mice, e.g. rhodamines, rose Bengal
- A61K49/0043—Fluorescein, used in vivo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/001—Preparation for luminescence or biological staining
- A61K49/0063—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres
- A61K49/0069—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the agent being in a particular physical galenical form
- A61K49/0073—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the agent being in a particular physical galenical form semi-solid, gel, hydrogel, ointment
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/34—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase
- C12Q1/44—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase involving esterase
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- 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"
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2334/00—O-linked chromogens for determinations of hydrolase enzymes, e.g. glycosidases, phosphatases, esterases
- C12Q2334/40—Triphenylmethane dye chromogens, e.g. fluorescein derivatives
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- 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"
- G01N2021/6439—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" with indicators, stains, dyes, tags, labels, marks
Definitions
- the present invention relates to compounds derived from fluorescein, and their use as fluorescent markers. They can in particular be used in biology and medicine, particularly in the field of ophthalmology. Non-fluorescent fluorescein derivatives are activated in the living cell, allowing the detection of living cells as well as the quantification of cell viability thanks to fluorescence, and in the absence of cell toxicity.
- Corneal transplantation is the most common transplant in the world among all cell and organ transplants with more than 100,000 transplants performed each year.
- the cornea the only transparent tissue in the body, plays an essential role in the refraction of light which is directed towards the retina. An alteration of this leads to a decrease in visual acuity, or even to a loss of vision.
- Corneal transplantation is thus necessary in many pathologies such as Fuchs dystrophy and bullous dystrophies, infectious keratitis and keratoconus, but is also used in cases of perforating trauma such as accidents or burns.
- the corneas to be transplanted are taken from the donors and stored in eye banks, also called cornea banks. Before carrying out the transplant, it is essential to check the quality of the graft, as several factors may be responsible for any alteration such as the state of health of the donor, the harvesting conditions and/or the storage conditions. For this purpose, it is essential that the viability of the endothelial cells of the corneal grafts be measured.
- dyes such as Trypan blue (CAS [75-57-1]) and tetrazolium salts (CAS [298-93-1]), or fluorophores such as for example acridine orange (CAS [260-94-6]) and DAPI or Di Amido Phenyl Indol (CAS [28718-90-3]).
- fluorophores such as for example acridine orange (CAS [260-94-6]) and DAPI or Di Amido Phenyl Indol (CAS [28718-90-3]).
- Still other compounds allow both staining and visualization of cells by fluorescence. Such is the case of the compound resazurin (CAS [550-82-3]).
- these dyes or fluorophores do not allow cell viability to be measured without altering the cells and consequently the samples analyzed. Indeed, the dyes diffuse into all the cells. Living cells exclude them while non-viable cells absorb them and become visible. A first limit to their use is therefore the overestimation of the proportion of living cells since only cells at an advanced stage of cell death are detected. A second limit is the intensity of the staining which is often low making the cells barely visible, or even not at all (Graefe's Archives for Clinical and Experimental Ophthalmology, 1986, 224, 428-434).
- Fluorophores make it possible to distinguish living cells, but their accumulation within cells ultimately leads to cell death.
- Another approach to measuring cell viability is the use of fluorescent probes comprising one or more fluorochrome groups which are released following a cleavage reaction. The cells then become visible by fluorescence and can be easily studied under fluorescence microscopy ⁇ Anal. Chem., 2019, 91, 2255-2259; Biochemistry: Rottman and Papermaster, 1966, 55, 134-141). Such compounds are also used in other technical fields (JP 2009-006635, JP 2005-091802).
- the use of these fluorescent probes has many advantages. It is a selective method, quick and easy to implement.
- fluorescent probes make it possible to work on living cells in vitro or in vivo. The signal emitted is generally of good quality: it is specific, durable and strong.
- One of the examples of a widely used fluorescent probe for measuring cell viability is Calcein-AM.
- fluorescent probe allows an objective, precise and non-toxic measurement of cell viability.
- the invention relates to a compound of general formula (I), characterized in that:
- - X 1 is chosen from H, Cl, F, Br and NO2;
- - X 2 is chosen from H, Cl, Br and N(CH 2 CC>2H)2;
- R 2 is chosen from H, NCS and CO2R 3 ;
- R 3 is chosen from H or a C 1 -C 3 alkyl; and its pharmaceutically acceptable salts.
- the invention also covers the use of the compound of general formula (I) as a cell marker, and preferably as a marker of cell viability.
- the invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising the compound of general formula (I) and a pharmaceutically acceptable excipient and/or vehicle.
- the invention finds its application in the field of human, animal and plant biology. It is preferentially used in the field of ophthalmology.
- the invention relates to a compound of general formula (I), characterized in that:
- - X 1 is chosen from H, Cl, F, Br and NO2;
- - X 2 is chosen from H, Cl, Br and N(CH 2 CC>2H)2;
- R 2 is chosen from H, NCS and CO2R 3 ;
- R 3 is chosen from H or a C 1 -C 3 alkyl; and its pharmaceutically acceptable salts.
- the compounds of general formula (I) or pharmaceutically acceptable salts may comprise one or more stereocenters, each of which may exist independently of the others in an R or S configuration.
- the compounds described are therefore in racemic or optically active forms.
- salts denotes derivatives of the compounds of general formula (I) for which the acidic and/or basic groups exist in their salt form.
- Pharmaceutically acceptable salts within the scope of the present invention include conventional non-toxic salts.
- the pharmaceutically acceptable salts according to the invention will appear obvious to those skilled in the art. Examples of salts which can be used are calcium chloride, potassium chloride, magnesium chloride, hydrogen phosphate, phosphate, edetate, citrate, lactate, hyaluronate, sodium borate and stearate. .
- alkyl designates a linear and/or branched carbon chain.
- C a - C b where a and b are integers, corresponds to the number of carbon atoms.
- C3-C20 alkyl denotes a linear or branched chain comprising from 3 to 20 carbon atoms.
- C3-C20 alkyl groups are propyl, iso-propyl, butyl, iso-butyl, sec-butyl, tert-butyl, pentyl, iso-pentyl, hexyl, iso-hexyl, heotyl , octyl, nonyl, decyl, undecyl and dodecyl.
- polyethylene glycol designates in the context of the present invention, polyethylene glycols or poly(ethylene oxide) with an average molar mass ranging from 200 to 8000 g/mol.
- polypropylene glycol this denomination groups together, within the framework of the present invention, the polymer compounds of the propylene glycol type having an average molar mass ranging from 200 to 600 mol/g.
- sucrose refers to the compounds glucose, fructose, galactose, mannose, sucrose, lactose, maltose and sorbitol.
- natural polysaccharides polysaccharides of plant origin, such as cellulose, starch, agarose, alginate and inulin, and polysaccharides of animal origin. such as hyaluronic acid or hyaluronate, chitin and chitosan.
- Fluorescein can exist in two tautomeric forms: a closed form and an open form (formulas VI and VII).
- corresponding derivative of fluorescein is meant in the context of the present invention the fluorochrome group of fluorescein substituted by the groups X 1 , X 2 and R 2 as defined previously and represented by the structure below (formula VIII). As previously described for fluorescein, it is understood that the corresponding derivatives of fluorescein can exist in their tautomeric form.
- the present invention relates to a compound of general formula (I), characterized in that:
- - X 1 is chosen from H, Cl, F, Br and NO 2 ;
- - X 2 is chosen from H, Cl, Br and N(CH 2 CC> 2 H) 2 ;
- R 2 is chosen from H, NCS and CO 2 R 3 ;
- R 3 is chosen from H or a C 1 -C 3 alkyl; and its pharmaceutically acceptable salts.
- the R 1 group is a C5-C10 alkyl.
- R 1 is chosen from n-pentyl and n-decyl groups.
- the alkyl groups can be linear or branched, thus in a particular embodiment, the group R 1 is a linear C3-C20 alkyl.
- R 1 is a derivative of malic acid or a corresponding ester, i.e. R 1 is defined by the formula , wherein R 4 and R 4 ' are selected from hydrogen or C1-C6 alkyl.
- the R 4 and R 4 'groups can be different or identical. In one embodiment, the R 4 and R 4 'groups are identical.
- the R 2 group is hydrogen
- the X 1 group is hydrogen
- the X 2 group is a hydrogen
- the R 2 , X 1 and X 2 groups are hydrogens.
- the compounds of general formula (I) or the pharmaceutically acceptable salts are used for cell marking, as fluorescent markers, and more particularly for marking cell viability.
- the compounds of the present invention comprise within their structure a fluorochrome: fluorescein or a corresponding derivative.
- the hydrolysis of the carbonate groups R 1 -0-C( 0)-0 by the esterases after penetration into the cell, releases the fluorochrome as well as by-products in particular carbon dioxide and the alcohol of type R 1 - OH.
- R 1 groups as defined for the compounds of formula (I) or the pharmaceutically acceptable salts are preferably groups devoid of cellular toxicity.
- the fluorescence emitted by the fluorochrome thus released is visible by techniques well known to those skilled in the art.
- the visualization of the fluorescence can be done with the naked eye or using devices such as glasses or microscopes, and generally requires the application on the fluorophore of a light at a wavelength generally included between 480 and 520 nm.
- the hydrolysis of the compounds of the present invention takes place at the level of the cytoplasm. In the absence of esterase reactivity, no cleavage reaction occurs and therefore no fluorescence or staining of the cells is observed.
- the compounds of general formula (I) or the pharmaceutically acceptable salts are thus used for the quantification of cell viability. Indeed, the activity of the ubiquitous esterases being proportional to the viability of the cells, the intensity of the signal emitted by the released fluorochrome is also proportional to the cellular activity and only the living cells are detected.
- the absence of cellular toxicity allows use of the compounds of the present invention both in vitro and in vivo without altering the cells, and while allowing their viability to be preserved.
- the invention also relates to a method for cell labeling of a set of cells which comprises the steps of bringing the cells into contact with a compound of general formula (I) according to the invention, then of verifying the presence of coloration or fluorescence in the set of cells.
- the invention also relates to a method for verifying the cell viability of a set of cells which comprises the steps of bringing the cells into contact with a compound of general formula (I) according to the invention, then of verifying the presence of coloration or fluorescence in the cell aggregate.
- the fluorescence or coloration which is the result of cell lysis of the compound of general formula (I) releasing the chromophore or fluorophore derived from fluorescein makes it possible to conclude as to the presence of living cells.
- the implementation of the method according to the invention comprises the identification and the counting of the number of living cells in the set of cells .
- a light source excites the fluorophore at a wavelength comprised between 480 and 520 nm, preferentially between 490 and 510 nm, more preferentially between 490 and 500 nm.
- the light source excites the fluorophore at a wavelength of 495 nm.
- the fluorophore After excitation, the fluorophore releases energy in the form of fluorescent light, the wavelength of which is between 500 and 540 nm, preferentially between 510 and 530 nm, even more preferentially at 520 nm.
- the marked cells become visible and can be counted.
- the set of cells can be a sample taken from a living organism, in particular a biological tissue, or even an organ or part of an organ in the same living organism. Mention will be made, by way of examples, of grafts, and in particular corneal grafts, bone marrow grafts and kidney grafts.
- the living organisms are advantageously animals, in particular mammals, and more particularly humans.
- the use or the method according to the invention can be implemented with the compound of general formula (I) as sole marker of cell viability.
- it can be used with other known or future markers, in particular markers which make it possible to identify dead cells, so as to increase the contrast and facilitate the identification and counting of viable cells.
- markers which make it possible to identify dead cells, so as to increase the contrast and facilitate the identification and counting of viable cells.
- these other known markers mention may be made, for example, of Trypan blue.
- the compounds of the present invention used as a cell marker and preferably as a cell viability marker find applications in many fields such as scientific research, cell and tissue therapy units, or even in the medical field with use for clinical diagnostics.
- the absence of cellular toxicity of the compounds of the present invention thus allows a quantification of the cellular viability without altering the tissues and/or the cells analyzed. They can therefore be used for in vitro, ex vivo or even in vivo studies.
- the compounds can in particular be used to measure the viability of a cell and/or tissue graft before its implantation, or else in order to follow the evolution of a pathological process, for example in the field of oncology.
- the cells targeted by the labeling are in particular endothelial cells, and more particularly corneal endothelial cells.
- the cells of interest are hematopoietic cells.
- the compounds of the present invention find particular application in measuring the endothelial cell viability of corneal grafts intended for corneal transplantation, by staining corneal endothelial cells and counting living cells.
- compositions and pharmaceutical compositions are provided.
- the active ingredient can also be used in the form of a composition, in particular a pharmaceutical composition.
- compositions according to the invention comprise a compound of general formula (I) according to the invention and a suitable vehicle for the use which will be made of the compound.
- a suitable vehicle for the use which will be made of the compound.
- the appropriate vehicle must not affect the viability of the cells.
- the compositions according to the invention do not include toxic substances, or at least at toxic doses, which would affect cell viability.
- Those skilled in the art are familiar with the various vehicles and excipients that can be used to allow the compound of general formula (I) to be applied to cells, and will be able to select them to promote the implementation of methods for verifying cell viability.
- a preferred vehicle is water.
- the term “pharmaceutical composition” designates a mixture of at least one active compound with at least one pharmaceutically acceptable excipient and/or vehicle. These pharmaceutical compositions are suitable for in vitro, ex vivo and in vivo use of the compounds of general formula (I) according to the invention.
- compositions of the invention comprise a compound of general formula (I) or a pharmaceutically acceptable salt as active substance and a pharmaceutically acceptable excipient and/or vehicle.
- excipient and the vehicle are "pharmaceutically acceptable” in the sense that they are compatible with the other ingredients of the composition and are non-toxic. Their use makes it possible in particular to facilitate the preparation, storage and administration of the active compound.
- excipients and vehicles are well known to those skilled in the art, described in particular in the French or European pharmacopoeia.
- compositions and vehicles include all solvents, dispersing media, coatings, antibacterial and antifungal agents, isotonic agents, absorbents, and others that are physiologically compatible.
- Examples of pharmaceutically acceptable excipients and vehicles are water, saline solutions, alcohols (glycerol, glycols), polyethers (polyethylene glycols, propylene glycols, poly(oxy)ethylene glycols and their derivatives ), polyethoxylated derivatives of castor oil (Kolliphor® EL, Cremophor® EL, and derivatives), hyaluronic acid, sodium hyaluronate, chondroitin sulphate, and in particular sodium chondroitin sulphate, carbomers, and in particular carbomer 974P, poloxamers, poloxamines, dextrans, vegetable oils (soybean oil, rapeseed oil, sunflower oil, olive oil, sweet almond oil, cottonseed oil, castor oil) and mineral oils (vaseline, paraffin), silicones, gelatins, agaroses (agar-agar), alginates, pectins, tragacanth, karaya gum, xanthan
- the excipient and/or the pharmaceutically acceptable vehicle is chosen from water, polyethoxylated derivatives of castor oil, hyaluronic acid, sodium hyaluronate, sodium chondroitin sulfate, and carbomers.
- compositions can be prepared by any method known to those skilled in the art.
- An appropriate quantity of the compound of general formula (I) is mixed with an excipient and/or a pharmaceutically acceptable vehicle to obtain the desired formulation which must be compatible with the mode of administration.
- composition according to the invention is advantageously a solution comprising the compound of general formula (I), in particular a solution, a suspension, an emulsion, a gel or an ointment or even a film.
- the composition according to the invention is an aqueous composition.
- the pharmaceutical composition is in the form of a solution, gel or film.
- the pharmaceutical composition is formulated for topical administration, and preferably for ophthalmic administration.
- the pharmaceutical composition can thus be formulated in the form of eye drops, eye drops or eye drops, creams, ointments, gels and hydrogels.
- compositions can also be prepared extemporaneously by mixing the compound of formula (I) according to the invention, alone or in the form of a composition, with the appropriate liquid vehicle for its use.
- the composition which comprises the compound of general formula (I) can be in solid form (powder or tablets in particular) or else in the form of a concentrated liquid.
- the pharmaceutical composition of the present invention is preferably in the form of an aqueous composition. It is particularly suitable for use in ophthalmology.
- the pharmaceutical or non-pharmaceutical composition thus has a physiologically compatible pH, that is to say a pH of between 5 and 8. It therefore generally comprises a buffer suitable for ophthalmic use, known to those skilled in the art.
- compositions of the invention may comprise other usual adjuvants used for the preparation of such pharmaceutical compositions such as co-solvents, softeners, antioxidants, opacifiers, stabilizers, ionic or nonionic thickeners, surfactants, viscosity agents, osmoprotectants, penetrating agents, gelling agents, silicones, anti-foaming agents, moisturizing agents, vitamins, perfumes, preservatives, fillers, sequestrants, colorants, bases or acids necessary for pH regulation, or any other ingredient usually used for the preparation of ophthalmic compositions.
- preservatives generally employed in topical compositions are well known to those skilled in the art, such as quaternary ammoniums, in particular benzalkonium chloride, alkyl-dimethyl-benzylammonium, cetrimide, cetylpyridinium chloride, benzododecinium bromide, benzothonium chloride, cetalkonium chloride, mercurial preservatives, such as phenylmercuric nitrate/acetate/borate, thiomersal, alcoholic preservatives, such as chlorobutanol, benzyl alcohol, phenylethanol, phenylethyl alcohol, carboxylic acids, such as sorbic acid, phenols, in particular methyl/propyl paraben, amidines, for example chlorhexidine digluconate and/or chelating agents such as EDTA alone or in combination with at least
- compositions without preservatives according to the invention differs from a simple composition comprising the same ingredients and obtained without showing any particular precautions or describing the stages of the process making it possible to obtain this characteristic sterility of the pharmaceutical compositions according to the invention, in particular ophthalmic compositions.
- the compounds of the present invention can be used in combination with one or more therapeutic agents.
- the administration of different active substances can be simultaneous, sequential or spaced out over time. Preparation process
- the first step is the reaction of diphenol (II) with diphosgene (trichloromethyl chloroformate, CAS [503-38-8]), or a derivative such as phosgene (carbonyl dichloride, CAS [75-44-5]) or triphosgene (bis(trichloromethyl carbonate), CAS [32315-10-9]).
- diphenol reacts with diphosgene.
- the reaction temperature is between 40 and 80°C.
- the reaction temperature is preferably between 50 and 70° C., more preferably between 55 and 65°C. In one embodiment, the reaction temperature is between 57 and 63°C, and more preferably the reaction temperature is about 60°C.
- the reaction is carried out in an anhydrous organic solvent, and preferably in a chlorinated solvent, such as chloromethane, dichloromethane, chloroform, tetrachloromethane, trichloroethylene, 1,1,1-trichloroethane, 1,2-dichloroethane, etc
- a chlorinated solvent such as chloromethane, dichloromethane, chloroform, tetrachloromethane, trichloroethylene, 1,1,1-trichloroethane, 1,2-dichloroethane, etc
- the reaction solvent is 1,2-dichloroethane.
- Other solvents in anhydrous form such as diethyl ether, dibutyl ether, tetrahydrofuran (THF) and dioxane can also be used.
- a base can optionally be used for this reaction.
- Bases of the tertiary and or hindered secondary amine type such as triethylamine, isopropylamine, diisopropylamine, N,N-diisopropylethylamine, pyrrolidine, pyridine, etc., will be chosen. In one embodiment, the use of triethylamine or diisopropylethylamine will be preferred.
- the intermediate compound (III), is thus obtained after evaporation of the reaction medium.
- the condensation reaction takes place at a temperature between 50 and 90°C, preferably between 60 and 80°C.
- the reaction temperature is between 65 and 75°C, preferably between 68 and 72°C.
- a temperature of about 70°C will be chosen.
- the reaction solvent is an anhydrous organic solvent, preferably a chlorinated solvent, such as chloromethane, dichloromethane, chloroform, tetrachloromethane, trichloroethylene, 1,1,1-trichloroethane, 1,2-dichloroethane, etc. .
- the reaction solvent is 1,2-dichloroethane.
- Other solvents in anhydrous form such as diethyl ether, dibutyl ether, THF and dioxane can also be used.
- a base of the tertiary amine type will preferably be used, such as triethylamine, isopropylamine, diisopropylamine, N,N-diisopropylethylamine, pyrrolidine, pyridine, etc.
- triethylamine or diisopropylethylamine will be the bases selected for the reaction.
- Figure 3 Images of HEL-299 cells obtained using the MVX10 macroscope under the FITC filter following staining: A: Calcein-AM (4 mM); B: F4267 (4mM); C: F4267 (40 mM) (x2.5 and x6.3 objectives respectively for the first and second line).
- Figure 4 Endothelial cell loss of human corneas preserved in organoculture and brought into contact with the product F4267 (40 mM) either repeatedly every day for 7 days or once on D0, before each being exposed daily to the light under FITC filter
- Figure 5 Viability measured in % by fluorescence analysis on human corneas, one of which is incubated daily with the product F4267 (images A and A') and the other uniquely (images B and B') on D0 , but both exposed daily to light under the FITC filter. Images A and B represent the fluorescence after incubation with the product F4267 on D0 and images A' and B' represent the fluorescence after incubation with Calcein-AM at the end of the experiment on D7 to measure cell viability.
- Figure 6 Images of B4G12 cells obtained using an epifluorescence microscope under the FITC channel and after labeling with calcein-AM (4 mM) and the product F4267 (40 mM) with and without rinsing with PBS according to example 5.
- Figure 7 Images of B4G12 cells obtained using an epifluorescence microscope under the FITC channel after labeling for 5 days with calcein-AM (4 mM) and the product F4267 (40 mM), with and without rinsing in PBS, according to Example 5.
- Figure 8 Images of B4G12 cells obtained using an epifluorescence microscope under the DAPI channel (405 nm) after labeling for 5 days with calcein-AM (4 mM) and the product F4267 (40 mM), with and without rinsing with PBS, according to Example 5.
- fluorescein dicarbonate The general synthesis of “fluorescein dicarbonate” compounds is carried out from fluorescein or corresponding derivatives.
- the synthesis takes place in 2 steps: a) the fluorescein or the corresponding derivative reacts with a phosgene-generating reagent (phosgene, diphosgene or triphosgene) in the presence of a base and the solvent is evaporated, b) the synthesis intermediate obtained reacts with an alcohol in the presence of a base to obtain the final compound of general formula (I). a) Synthesis protocol in the presence of primary alcohols
- the reaction medium is poured into water and extracted with DCM.
- the organic extracts are combined, washed with water, then with saturated aqueous NaCl solution, dried over MgSC, and the solvent is evaporated by rotary evaporation.
- the crude product is finally purified by column chromatography on silica gel (AcOEt/EP) to obtain the desired product.
- b) Synthesis protocol in the presence of secondary alcohols Diphosgene (6 eq) then diisopropylethylamine (7 eq) are successively added dropwise to a suspension of fluorescein (1 eq.) in DCE.
- the reaction mixture is heated at 60° C. for 2 hours.
- the solvent is evaporated with a Schlenk line and the product is dried for several hours in the dark.
- Fluorescein pentyl dicarbonate is purified on silica gel (AcOEt/EP 15:80) and isolated in the form of a transparent oil (36%).
- Lactate Dehydrogenases are a family of ubiquitous cytosolic enzymes present in almost all cell types. Membrane damage causes a release of LDH into the external environment. There is a direct correlation between cellular cytotoxicity which causes membrane damage and the amount of LDH present in the extracellular environment. In the cytotoxicity test, LDH is measured by the enzymatic reaction shown in Figure 1. LDH transforms pyruvate into lactate at the same time as there is reduction of NAD+ into NADH. The NADH thus produced reacts with fluorescent or luminescent molecules.
- the cytotoxicity test was carried out with the tetrazolium salt (INT) which is converted into formazan. The coloration was then studied using a spectrophotometer. Since the concentration of formazan is proportional to the quantity of LDH present in the medium, the latter was quantified by an absorbance reading at 555 nm, against a blank measurement at 650 nm to eliminate the parasitic absorbance from the medium. The percentage of dead cells is then calculated from the formula below, with the maximum LDH activity being that of a well in which all the cells have been lysed, and the basal LDH activity, that of a well not treaty.
- INT tetrazolium salt
- cytoplasmic labeling by compound 1 on cells was evaluated on the adherent line of normal human fetal lung fibroblasts HEL299 [ATCC CCL-137], because they form a cell monolayer (a single thickness facilitating the evaluation of cell morphology and enumeration).
- a macroscope macro-zoom microscope, MVX10, Olympus, Tokyo, Japan
- the cytotoxicities were 26.4 ⁇ 14.1% for calcein-AM, 7.3 ⁇ 3.4% for F4267 at 40 mM and 21.6 ⁇ 2.7% for F4267 at 1000 mM.
- the cytotoxicities were 18.8 ⁇ 11.1% for calcein-AM, 6.1 ⁇ 0.9% for F4267 at 40 mM and 22.3 ⁇ 3.8% for F4267 at 1000 mM ( Figure 2).
- the labeling of the FIEL299 cells made it possible to visualize the cellular cytoplasms in a similar way with the solution of Calcein-AM [4 mM] and with the solution F4267 respectively at [4 mM] and [40 mM] (FIG. 3).
- Example 3 Ex vivo study on endothelium of whole corneas, of the “cornea bank test” type
- the cytotoxicity of compound 1 was evaluated on the endothelium of whole corneas, using pairs of human corneas, preserved in organoculture and refused for transplantation by a cornea bank.
- the 2 corneas from the same donor have the same biological characteristics and constitute the best comparator of each other.
- Endothelial Cell Density ECD was first assessed before experimentation using cell counting by image analysis [Cell Tissue Bank, 2017, 18 (2), 185-191, Jumelle et al.], then the endothelium of the two corneas was brought into contact with a solution of F4267 [40 mM] for 45 minutes at ambient temperature, under sterile conditions [Invest Ophthalmol Vis Sci. 2011, 52 (8), 6018-6025, Pipparelli et al.].
- the corneas were then observed under the MVX10 macroscope with the x0.8 objective under the FITC filter, then returned to organ culture.
- the cornea of the right eye (OD) was brought into contact daily with a solution of F4267 [40 mM in OptiMEM, 45 minutes, room temperature] for 7 days while the cornea from the left eye (LE) was only incubated with optiMEM (solvent alone).
- the corneas were exposed daily to blue light from the FITC filter (same XCite lamp intensity at 12/100) under the x0.8 objective of the MVX10 macroscope.
- the quality of the cytoplasmic labeling by compound 1 (solution F4267) on corneal endothelium was compared with that of Calcein-AM by staining paired corneas.
- the DCE in viable cells on D7 after bringing the cornea of the OD into daily contact with the product F4267 followed by observation at low magnification for 7 days, was 1832 cells/mm 2 .
- This DCE was 1612 cells/mm 2 for a single contact of the LA cornea but also with daily exposure to light The cell loss is therefore comparable indicating that repeated incubation is well tolerated ( Figure 4) .
- the images in Figure 5 illustrate the viability measured in % after labeling with Calcein-AM on day 7 by fluorescence image analysis: cornea A (OD) brought into contact every day repeatedly for 7 days with the product F4267, cornea B (OG) brought into contact in a single way on D0 but both exposed daily to light under the FITC filter.
- the product F4267 [40 mM] allows labeling distinguishing the dead cells from the living cells (FIGS. 5A and 5B, at D0). In addition, it has been shown that the product F4267 [40 mM] allows marking to distinguish dead cells from living cells in a manner similar to Calcein-AM [4 mM] on the whole cornea.
- Corneal endothelial cells (B4G12), fibroblasts (Hel-299) and corneal epithelial cells (FICE-2) were cultured on an 8-well culture slide (LabTek, 177445) for 5 days in culture media corresponding and described below.
- Culture medium B4G12 ⁇ Gentamycin, OptiMEM, SVFD, CaICh, Ascorbic acid, EGF, Chondroitin sulfate, SB203580, Y27632.
- HCE-2 culture medium DMEM GlutaMax, F12-FIAM, SVFD, Antibiotic/mycotic, EGF.
- Hel-299 culture medium DMEM GlutaMax, SVFD, AT B/M
- cell labeling is carried out for 45 minutes with solutions comprising calcein-AM or the product F4267 at different concentrations (solutions A, B, C and D), before rinsing with PBS. Then the culture wells are removed, and the slide is mounted with a coverslip and Vectashield.
- Solution A calcein-AM (4 mM), Hoescht (1/200), ethydium (1/500)
- Solution C F4267 (4 mM), Hoescht (1/200), ethydium (1/500)
- Solution D F4267 (400 mM), Hoescht (1/200), ethydium (1/500)
- the slides are then observed under a macroscope with x0.8 and x6.3 magnification and under an epifluorescence microscope with x10 and x60 magnification.
- the different wells are observed under the same conditions at each magnification to allow a comparison of the intensities and the quality of the labeling with identical image processing.
- the experiment is carried out with FICEC-B4G12 corneal endothelial cells (CVCL 2065).
- the cells are thawed and cultured in their culture medium.
- the cells are trypsinized once a week before being seeded in wells of a 24-well plate at a concentration of 1.10 5 cells/mL.
- the cells are then incubated for 5 days at 37° C., 5% CO2 until 90% confluence.
- the various wells are stained daily with calcein-AM (4 mM) or the product F4267 (40 mM), according to the following conditions: labeling for 45 minutes, then rinsing with PBS or labeling for 45 minutes without rinsing.
- the marking and possibly rinsing step is repeated every day for 4 successive days, then after 2 days without marking, the marking is again repeated for 2 consecutive days.
- the labeling steps are carried out in duplicate. After each labeling, one well for each of the conditions is observed in epifluorescence microscopy (Olympus 1X81 microscope, FITC channel, x4 objective, L:25, Texp: 142.7ms), while the second well (control) is kept in the darkness in order to evaluate the impact of the fluorescence observation at the end of the study. On the last day of the study, labeling is carried out with calecin-AM (4 mM) in the presence of Floescht (1/500) or the product F4267 (40 mM) in the presence of Floescht (1/500), and the wells are imaged in MIA x4 (reconstruction of several fields to obtain a complete image of the well).
- the labeling steps are carried out in a clean room under PSM to ensure sterility, and the culture dishes are parafilmed during observation to limit possible contamination.
- FIGS. 6 and 7 represent the cell layers observed on D0, therefore the first day of labeling and on D5, ie the last day of labeling. It appears that the cell layers of cells marked with calcein-AM are less dense whether for the experiments in the presence or in the absence of rinsing, unlike the cell layers whose cells have been marked with F4267.
- Figure 8 corresponding to the images of the cells under the DAPI channel confirms the absence of a cell layer for the cells labeled with calcein-AM.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2104430A FR3122426B1 (fr) | 2021-04-28 | 2021-04-28 | Dicarbonate de fluoresceine, marqueur de viabilite cellulaire |
| PCT/EP2022/061415 WO2022229353A1 (fr) | 2021-04-28 | 2022-04-28 | Utilisation de dérivés de dicarbonate de fluoresceine comme marqueur cellulaire |
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| EP4330261A1 true EP4330261A1 (fr) | 2024-03-06 |
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| EP22726115.3A Pending EP4330261A1 (fr) | 2021-04-28 | 2022-04-28 | Utilisation de dérivés de dicarbonate de fluoresceine comme marqueur cellulaire |
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| EP (1) | EP4330261A1 (fr) |
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| JP2005091802A (ja) * | 2003-09-18 | 2005-04-07 | Fuji Photo Film Co Ltd | 平版印刷版原版 |
| JP2009006635A (ja) * | 2007-06-29 | 2009-01-15 | Oji Paper Co Ltd | 潜像形成および顕色像形成方法、並びに、記録シートまたは記録シートセット |
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