EP3740307A1 - Verfahren zur behandlung von mindestens einer zelle mit einem chemischen syntheseprodukt in einem microarray - Google Patents
Verfahren zur behandlung von mindestens einer zelle mit einem chemischen syntheseprodukt in einem microarrayInfo
- Publication number
- EP3740307A1 EP3740307A1 EP19712967.9A EP19712967A EP3740307A1 EP 3740307 A1 EP3740307 A1 EP 3740307A1 EP 19712967 A EP19712967 A EP 19712967A EP 3740307 A1 EP3740307 A1 EP 3740307A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microarray
- cell
- chemical synthesis
- reactants
- hydrophilic
- 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.)
- Pending
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/508—Rigid containers without fluid transport within
- B01L3/5085—Rigid containers without fluid transport within for multiple samples, e.g. microtitration plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0809—Geometry, shape and general structure rectangular shaped
- B01L2300/0829—Multi-well plates; Microtitration plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/16—Surface properties and coatings
- B01L2300/161—Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
Definitions
- the present invention relates to a method for treating at least one cell with a chemical synthesis product in a microarray, a stacked microarray, a kit comprising at least one microarray and the use of a microarray for the chemical synthesis of a chemical synthesis product and for the treatment of at least one Cell with the chemical synthesis product in a microarray.
- the development of biologically active substances requires mastering multidisciplinary challenges in the field of chemical biology.
- the first step here is to find a chemical structure that interacts in the biological framework. If such a lead structure can be identified, it usually has to be optimized for further drug development, since in many cases it does not yet have a selective effect on the biological target.
- DOS diversity-oriented synthesis
- the combinatorial synthesis of molecules allows both a high degree of flexibility in the chemical framework and the possibility of parallel synthesis of very large libraries.
- bulk synthesis usually involves a great deal of reagent, material and labor time requirements.
- miniaturized form - such as in microarray format - a synthesis in the liquid phase.
- chemical synthesis is always separate from the biological application, which makes the screening of large libraries even more time-consuming and thus more costly.
- solid-phase bound systems have been used to synthesize molecules in microarrays.
- solid-state microarrays chemistry is limited to simple surface synthesis, while in classical liquid-phase chemistry the full range of complex reaction mechanisms is available.
- immobilization on the surface requires additional reaction steps which would not be necessary in the liquid phase, and additional functional groups are required on the target compounds in order to be able to bind them to the solid phase in the first place.
- MTP microtiter plates
- wells wells
- large amounts of expensive reagents and cells are still needed (per well in 96-well MTP ⁇ 100pL solution / suspension), and the process is also very time consuming.
- automation is possible, expensive robots and consumables are needed (for example, starting with synthesis to transfecting cells into 96-well MTP, approximately 800 pipette tips are needed).
- miniaturization in MTP format (standardized) is also limited due to physical limitations.
- the present invention provides a method of treating at least one cell with a chemical synthesis product in a microarray comprising the steps of:
- a first microarray having a surface with at least one hydrophilic region enclosed by a hydrophobic region, and carrying on at least one hydrophilic region a stopper of a first solution comprising a first reactant;
- hydrophilic region comprises a reaction product of the first and second reactants as a chemical synthesis product.
- a microarray in the sense of the present invention is understood as meaning a solid substrate having a patterned surface layer which comprises hydrophilic areas, so-called spots, which are each enclosed by hydrophobic areas (hydrophobic boundaries) on at least one surface of the microarray.
- the surface layer may in this case be in the form of a film, a film or a coating, for example.
- the substrate is not particularly limited and may be any substrate which is preferably solid in a temperature range of -30 ° C to 130 ° C, more preferably in a temperature range of 0 ° C to 40 ° C, and most preferably at room temperature.
- the solid substrate may for example be selected from glass, metal, for example stainless steel or aluminum foil, plastic, concrete or wood.
- the solid substrate is transparent, with a glass substrate being preferred.
- the solid substrate has preferably a flat surface.
- the hydrophilic areas of a microarray are not particularly limited in shape and may be circular, star-shaped or polygonal (triangular, rectangular, pentagonal, hexagonal, ). Hydrophilic areas with a triangular or rectangular shape allow close placement of the hydrophilic areas on the substrate. Nevertheless, for the purposes of the present invention, a microarray is not limited to a particular arrangement of the hydrophilic regions, and represents a comprehensive approach for creating defined arrays of individual drops of equal volume on the surface of a substrate.
- the hydrophilic regions may be, for example, triangular or rectangular with a side length of 5 mm or less, 3 mm or less, 1 mm or less or 500 ⁇ m or less. In a preferred embodiment of the present invention, the hydrophilic regions are round with a diameter of 5 mm or less, more preferably 3 mm or less, even more preferably 1 mm or less.
- the hydrophobic regions enclosing the hydrophilic regions are preferably 1 mm or less in width, more preferably 0.5 mm or less, and most preferably 0.1 mm or less.
- the thickness of the patterned surface layer is not limited. From the viewpoint of saving properties and reduction in manufacturing cost, the patterned surface is preferably thin. In particular, a thickness of 45 ⁇ m or less is preferred, more preferably 30 ⁇ m or less, and most preferably 15 ⁇ m or less.
- surfaces can be classified as hydrophilic or hydrophobic depending on their contact angle with water.
- a surface with a static contact angle of at least 90 is referred to as hydrophobic, while a surface with a static contact angle of less than 90 ° is referred to as hydrophilic.
- Static contact angles (0 s tat) are determined by placing a drop on a surface and measuring the contact angle of the resting rapping with the surface with a goniometer or a camera using special software (sessile drop measurement).
- Dynamic contact angles represent contact angles outside an equilibrium state and are measured during the progression (0adv) or retraction (Orec) of a drop. The difference between 0a v and 0 re c is called the contact angle hysteresis.
- hydrophobic regions have a static water contact angle of at least 90 °, preferably more than 95 °, more preferably more than 100 °, and most preferably more than 110 °.
- the hydrophobic regions of a chip are superhydrophobic and / or the hydrophilic regions are superhydrophilic.
- superhydrophobic regions have a static water contact angle of greater than 130 °, preferably greater than 140 °, and more preferably greater than 150 °.
- superhydrophilic regions preferably have a water contact angle of less than 30 °, more preferably less than 20 °, and most preferably less than 10 °.
- a microarray of the present invention is capable of supporting at least one drop of a solution on this patterned surface.
- a microarray is capable of carrying at least 1 drop per cm 2 of the patterned surface, more preferably at least 4 drops per cm 2 of the patterned surface, even more preferably at least 8 dots per cm 2 of the patterned surface, and most preferably at least 16 drops per cm 2 of the patterned surface.
- the upper limit of the number of drops per cm 2 of the patterned surface is not particularly limited and can be determined as required.
- a microarray carry at most 100 drops per cm 2 of the patterned surface, more preferably at most 50 Drop per cm 2 of the patterned surface, more preferably at most 20 drops per cm 2 of the patterned surface.
- the droplets disposed on the patterned surface of a microarray have a volume of from 100 pL to 1 mL, more preferably from 1 nL to 100 pL, even more preferably from 100 nL to 50 pL, and most preferably from 500 nL to 25 pL.
- the drops on the patterned surface of the microarray can be applied by known methods.
- the orders can be made, for example, manually or automatically. Preferably, the orders are made manually.
- the orders can be made, for example, by means of discontinuous wetting. Particular emphasis should be placed here methods by rolling droplet, standing droplet, or immersion and removal of the microarray from a solution.
- the method of applying the present invention is not particularly limited, and a person skilled in the art may select, as appropriate, the method best suited thereto.
- a stopper of the solution to be applied is rolled over the patterned surface of the microarray, spontaneously forming microdroplets of defined geometry and volume in the hydrophilic regions.
- individual areas of the microarray can be specifically provided with droplets and it is possible to apply drops of different solutions to different hydrophilic areas of the microarray.
- the patterned surface of the microarray is covered with the solution to be applied and the excess solution tilted laterally, with micro-droplets spontaneously forming in the hydrophilic regions with defined geometry and volume.
- the comparatively simple implementation of the standing droplet method requires a larger solution volume compared to the rolling droplet method, since the entire patterned surface of the microarray must be overcoated, and all the droplets produced contain the same solution.
- High surface tension liquids (HSTL) microarrays are generally used for aqueous solvents with a high surface tension (more than 72.2 mN nr 1 ), whereas for organic solvents with a lower surface tension (less than 72.2 mN irr 1 ) low surface tension liquids (LSTL) Microarrays are used.
- an HSTL microarray can be made by a process comprising the following steps:
- HEMA 2-hydroxyethyl methacrylate
- EDMA ethylene dimethacrylate
- PFDT perfluorodecanethiol
- the additional polymerization on the substrate surface can be dispensed with.
- the production of an LSTL microarray involves the following steps:
- a glass surface is modified with chlorodimethylvinylsilane and patterned with a photochemical thiol-ene reaction.
- PFDT photochemical thiol-ene reaction.
- cysteamine hydrochloride is used.
- a first microarray which has a surface with at least one hydrophilic region enclosed by a hydrophobic region and which carries at least one hydrophilic region with a rupture of a first solution, which comprises a first reactant.
- Microarrays can be prepared by the methods described above.
- the number and arrangement of the hydrophilic spots is not particularly limited. In a preferred embodiment, the number of hydrophilic spots is at least 1 per cm 2 of the patterned surface of the microarray, more preferably at least 4 per cm 2 of the patterned surface of the microarray, even more preferably at least 8 per cm 2 of the patterned surface of the microarray and most preferably at least 16 per cm 2 of the patterned surface of the microarray.
- the hydrophilic spots are preferably arranged in a regular pattern, for example in rows and columns.
- the application of a solution to at least one stop of a solution on at least one hydrophilic area can be carried out as described above.
- the solution is applied to more than one hydrophilic area of the patterned surface, preferably to more than 5, 10, 20, 50, 100 or 500 hydrophilic areas, more preferably all hydrophilic areas.
- the solution is applied to at least 5, 10, 15, 20, 30, 50 or 75% of the hydrophilic areas, more preferably to 100% of the hydrophilic areas.
- the solutions are applied manually to the patterned surfaces to produce drops of the solutions.
- a solution can be applied, which already contains the corresponding reactant.
- the appropriate reactant may be in dry form, which solubilizes the microarray by applying a suitable solvent to form the droplets of a solution containing a reactant.
- a microarray it is possible to carry out chemical synthesis in a microarray according to steps (1) and (2) of the method of the present invention and drying the resulting microarray comprising reaction products of the first and second reactants on the hydrophilic regions to form dry residues of the resulting reaction products on the hydrophilic regions of the microarray.
- Drops of a suitable solvent can be applied to such a dried microarray as described above in order to obtain again a microarray carrying on at least one hydrophilic area a drop of a solution comprising a reactant.
- the method for treating at least one cell with a chemical synthesis product in a microarray of the present invention further comprises a step (2) of adding a second reactant to at least one hydrophilic region of the first microarray containing a first reactant under conditions including Allow reacting the first and second reactants.
- the manner of adding the second reactants is not further limited here.
- the drops of the solution of the first reactant may be dried to form a dried residue of the first reactant, and a solution containing a second reactant may be applied to the spots with the dried residues as described above.
- the addition of a second reactant to at least one hydrophilic region of the first microarray, which contains a first reactant takes place by means of sandwiching the first microarray with a second microarray.
- the step (2) of the method of the present invention comprises the following steps:
- the first and second microarrays have the same number of hydrophilic areas on the surface. More preferably, in each case the same number of T ropfen arranged on the surface of the first and the second microarray. More preferably, the one or more droplets are disposed on the surfaces of the first and second microarrays in a complementary arrangement.
- a complementary arrangement in the sense of the present invention means that when the first and the second microarray are arranged one above the other, so that the droplets are arranged on the surfaces of the first and second microarrays between the substrates of the first and second microarrays, one drop at a time on the surface of the first microarray faces a drop on the surface of the second microarray.
- step (2ii) of contacting the droplets of the first microarray with a respective stopper of the second microarray the corresponding two droplets can join and the solutions of the droplets of the first and second reactants can mix.
- the first and second reactants are no longer separated, but together in a mixed solution.
- the contacting of the drops on the surface of the first and second microarrays is not particularly limited.
- the droplets of the first and second microarrays are brought into contact by a microarray is arranged pass match with respect to the other microarray, so that each drop on the surface of the first microarray each face a T ropfen on the surface of the second microarray and the microarray each other to be moved until the respective drops touch and connect with each other (sandwiched).
- the connected drops are hereby arranged between the patterned surfaces of the first and the second microarray.
- Such an arrangement is also called a stacked microarray or as Called microarray sandwich.
- a second reactant to at least one hydrophilic region of the first microarray containing a first reactant occurs under conditions that allow reacting the first and second reactants.
- These conditions are not particularly limited and may be adjusted by a person skilled in the art according to the reaction to be carried out. For example, the temperature or illumination may be adjusted to allow for the reaction of the first and second reactants.
- a microarray By adding a second reactant to at least one hydrophilic region of the first microarray containing a first reactant under conditions permitting reaction of the first and second reactants, a microarray is obtained having on at least one hydrophilic region a reaction product of the first and second reactants comprising second reactants. In this case, preferably only one type of reaction product is present on each hydrophilic area.
- the first and second reactants of the process of the present invention are not particularly limited and can be appropriately selected by one skilled in the art based on the chemical synthesis product to be obtained, as long as the first and second reactants either spontaneously or by activation, for example by a temperature change or illumination, for example ultraviolet light or in the presence of a catalyst.
- the first reactant and / or the second reactant may comprise a mixture of two or more mutually inert reactants.
- Reactants which are inert to one another in the context of the present invention are reactants which are under normal conditions and do not react with each other under conditions that allow reacting the first and second reactants.
- the first solution contains a mixture of two reactants that do not react with each other, so are inert to each other.
- a reaction product can be obtained which in turn can react with the other reactant of the first solution.
- the first and / or the second reactants are precursors of biologically active substances. This means that after successful implementation of the first and second reactants, biologically active compounds are obtained. More preferably, the first and second reactants are precursor compounds of cell-permeable substances.
- the first or the second reactants are covalently bound to the hydrophilic regions of the microarrays.
- the first reactants include thiolactones and pyridyl disulfides and the second reactants include amines.
- Other suitable reactants are, for example, amino acids and nucleotides.
- the first microarray carries a drop on more than one hydrophilic area. If the first microarray comprises more than one drop, it is preferred that at least two droplets each have a different first reactant.
- the drops are arranged on the hydrophilic areas of the surface of the first and second microarrays in a regular pattern, for example in rows and columns. When the droplets are arranged in rows and columns, it is preferred that within a row or within a column, the droplets contain the same solution with the same reactants. Furthermore, it is preferred that if the droplets on the surface of the first microarray contain the same solution within a row, the droplets within a column on the surface of the second microarray contain the same solution.
- a matrix of reactant mixtures can be obtained in which only the first or the second reactant changes within a row and within a column.
- a library of structurally related compounds can thus be obtained.
- the solutions of the first and / or second reactants comprise organic solvents.
- Suitable organic solvents are, for example, ethylene glycol, N, N-dimethylformamide, cyclohexanol, N-hexadecane, dichloromethane, acetone, 1-butanol, ethyl acetate, ethanol, n-hexane, toluene, methanol, tetrahydrofuran and dimethyl sulfoxide.
- the method according to the invention for treating at least one cell with a chemical synthesis product in a microarray further comprises a step (2iii) of separating the two microarrays until the droplets on the surface of the first and the second microarray no longer contact each other Step (2ii) and before the step (3) is executed.
- the separation of the two microarrays takes place in a direction which is opposite to the direction of the contacting. More preferably, the separation of the two microarrays takes place in a direction which is perpendicular to the surface of at least one of the two microarrays.
- the reaction of the first and second reactants allow, were in contact, in the corresponding separate drops on the hydrophilic areas of the surface of the first and the second microarray, a reaction product of the first and second reactants before.
- the method for treating at least one cell with a chemical synthesis product in a microarray further comprises the step (3) of contacting at least one cell with a hydrophilic region of the microarray, the hydrophilic region being a reaction product of the first and second reactants as chemical Synthesis product includes.
- the contact of at least one cell with a hydrophilic region of the microarray comprising a reaction product of the first and second reactants is not particularly limited.
- contacting at least one cell with a hydrophilic region of the microarray comprises a reaction product of the first and second reactants as chemical
- Synthesis product includes the following steps:
- Synthesis product includes.
- the microarray in step (3i) has the same number and the same arrangement of droplets of a cell suspension, such as drops on the surfaces of the first and / or the second microarray.
- each plug may comprise a suspension of the same type of cells, or different tubes may comprise different cell suspensions.
- the provision of a microarray of a cell suspension is analogous to the method described above for the provision of microarrays, for example by applying a cell suspension by rolling droplet or standing droplet on a HSTL microarray.
- the hydrophilic region comprising a reaction product of the first and second reactants as chemical synthesis product, as described above for the first and second microarray.
- contacting at least one cell with a hydrophilic region of the microarray comprising a reaction product of the first and second reactants as a chemical synthesis product comprises the steps of:
- the microarray carrying on at least one hydrophilic area a rupture of a solution comprising a reaction product of the first and second reactants as a chemical synthesis product, can be dried to obtain a microarray on whose hydrophilic spots dried residues of the reaction products of the first and second reactants are arranged.
- each spot comprises only one type of reaction product.
- This dried microarray is then overlaid with a cell suspension and excess suspension removed, for example by tilting the suspension. As a result, drops of the cell suspension form on the spots of the dried microarray.
- the dried residues of the reaction products can dissolve in the suspension drops and thus are in contact with the cells of the cell suspension.
- the reaction products are fixed on the spots of the dried microarray before the cell suspension is applied.
- This fixing can be done, for example, by applying a coating, for example a polymer or viscous compound, to the individual spots.
- the coating is preferably soluble in the cell suspension. More preferably, the coating is not biologically active. In a further preferred embodiment, the coating is gelatin.
- the method according to the invention is not restricted to specific cell types. Suitable cell types include prokaryotic cells such as bacteria and archaea, as well as eukaryotic cells such as yeast cells (such as Saccharomyces, eg, Saccharomyces cerevisiae), insect cells (eg, Drosophila melanogaster), plant cells, and mammalian cells (eg, HEK 293, HeLa, CHO, hematopoietic stem and progenitor cells ), wherein the mammalian cells also include human primary cells and cell lines.
- yeast cells such as Saccharomyces, eg, Saccharomyces cerevisiae
- insect cells eg, Drosophila melanogaster
- plant cells eg, HEK 293, HeLa, CHO, hematopoietic stem and progenitor cells
- mammalian cells eg, HEK 293, HeLa, CHO, hematopoietic stem and progenitor cells
- the reaction product of the first and second reactants is biologically active.
- biologically active one describes generally materials, which are able to influence a biological system.
- biologically active substances are, for example, pharmaceutically active Compounds, hormones or antibiotics.
- DNA or RNA strands may be said to be biologically active if they are capable of affecting a biological system.
- plasmids, siRNAs or microRNAs are biologically active DNA and RNA strands.
- the reaction product of the first and second reactants is cell permeable.
- Cell permeable means that the reaction products of the first and second reactants can diffuse through a cell membrane or can be actively transported by a cell through the membrane.
- the first reactant and / or the second reactant comprise a nucleotide strand or the reaction product of the first and second reactants is bound to a nucleotide strand or complexed with a nucleotide strand.
- This embodiment comprises, on the one hand, the possibility that the first and / or the second reactant is a nucleotide strand which can react with the other reactant to form a modified nucleotide strand.
- the original nucleotide strand may in this case be a naturally occurring nucleotide strand, for example a DNA strand, an RNA strand or a plasmid, or it may be an artificial nucleotide strand.
- An artificial nucleotide strand in the context of the present invention describes both a nucleotide strand which has been synthesized and naturally occurring nucleotide strands which have been chemically or biologically modified.
- the reaction product of the first and second reactants is chemically bound in a further step to a nucleotide strand or complexed with a nucleotide strand.
- Complexing here includes both noncovalent binding, for example, by electrostatic interactions, as well as the physical entrapment of a nucleotide strand within a structure formed by the reaction product of the first and second reactants.
- the at least one cell is transformed or transfected with the reaction product of the first and second reactants.
- T ransformation or transfection generally means the introduction of free DNA or RNA into prokaryotic or eukaryotic cells.
- cells can be influenced in their metabolic activity or cells can be modified so that they can produce certain compounds, such as dyes themselves.
- the method for treating at least one cell with a chemical synthesis product in a microarray of the present invention comprises the following step (4):
- the step of examining the biological activity of the reaction products of the first and second reactants is preferably carried out using the microarray.
- cells contacted with the reaction products in step (3) may be stained for health and analyzed photometrically or, if the cells have been transformed or transfected, the cells may be based on the engrafted DNA or RNA are examined.
- cells transformed with a plasmid that mediates the expression of a particular dye or antibiotic resistance gene may be screened for their antibiotic resistance or their dye expressivity.
- the present invention further relates to a stacked microarray in which two microarrays are arranged so as to face the surfaces which have hydrophilic regions enclosed by hydrophobic regions and at least one droplet on a hydrophilic region of the first microarray with one droplet be in contact on a hydrophilic area of the second microarray.
- the present invention relates to a kit comprising at least one microarray comprising dried residues of a reactant or nucleotide strand.
- standardized reactant or nucleotide libraries can be prepared and preserved, which are dissolved prior to their use by applying a suitable solvent to the hydrophilic regions of the microarray to form a microarray.
- the kit of the present invention serves to easily provide a standardized test scenario.
- the present invention also relates to the use of a microarray for the chemical synthesis of a chemical synthesis product and for the treatment of at least one cell with the chemical synthesis product in a microarray.
- FIG. 1 Exemplary Production of an HSTL Microarray
- A The photoinitiated copolymerization of 2-hydroxyethyl methacrylate (HEMA, (1)) and ethylene dimethacrylate (EDMA, (2)) results in the formation of a highly hydrophilic porous polymer layer.
- B After the esterification of the polymer with 4-pentynoic acid, the site-selective, photochemical functionalization with perfluorodecanethiol (PFDT, hydrophobic component) and mercaptoethanol (hydrophilic component) can form superhydrophilic spots (hatched) are delimited by superhydrophobic barriers (dotted).
- PFDT perfluorodecanethiol
- mercaptoethanol hydrophilic component
- FIG. 2 Exemplary production of an LSTL microarray. By silanizing a glass substrate, this is modified with vinyl groups. In a photochemical thiol-ene reaction, the surface can be patterned with perfluorodecanethiol (PFDT, hydrophobic component) and cysteamine hydrochloride (hydrophilic component). This results in superhydrophilic spots (hatched) separated by superhydrophobic boundaries (dotted).
- PFDT perfluorodecanethiol
- cysteamine hydrochloride hydrochloride
- Figure 3 Reactants used for lipidide synthesis
- A Precursor compounds used to synthesize the lipidoid library on a microarray.
- B Synthesis conditions in the microarray: the reaction is carried out at room temperature in DMSO as solvent and is complete after 2 hours.
- FIG. 4 Arrangement of the first and second reactants in a stacked microarray.
- the largest possible product structural framework can be generated (here 80 different lipidides (L )).
- FIG. 5 Formation of lipoplexes as transfection reagent. After completion of lipidoid synthesis, liposomes spontaneously form in aqueous solutions due to hydrophobic interaction. Electrostatic interactions cause the positively (+) charged head groups of the lipidides to complex negative (-) charged DNA. The resulting lipoplexes can be used as potential transfection reagents.
- FIG. 6 Results of the reverse transfection. From the individual spots at 10x magnification each one shot was created from the ImageJ using the average gray value was determined. At the same time, this value represents the relative transfection efficiency of the respective lipidide the same parameters, they can be compared with each other. After standardization of the values, a heat map could be generated in which both values (lipoplex and gelatin microarray) were taken into account.
- Example 1 Preparation of HSTL and LSTL microarrays
- HSTL microarray slides (Schröder special glass, Ellerau, Germany) of size 76x26 mm were used as substrates.
- the substrates were first activated for 1 hour in 1 M NaOH and then for 30 minutes in 1 M HCl, washed with distilled water and dried with compressed air.
- a solution of 3- (trimethoxysilyl) propyl methacrylate in ethanol (20 vol%) was applied to a substrate and the substrate was covered with another substrate. After 30 minutes, the substrates were separated, another 30 pL of 3- (trimethoxysilyl) propyl methacrylate applied, and the substrates paired for a further 30 minutes.
- the modified substrate was washed with ethanol and dried with compressed air.
- a fluorinated substrate On a fluorinated substrate, 30 pL of the polymerization solution was applied and the substrate was paired with a modified substrate. The superimposed substrates (fluorinated substrate below) were irradiated for 15 minutes with UV light of wavelength 260 nm (intensity: 5.0 mW cm -2 ). Subsequently, the substrates were separated, the polymerized substrate washed with ethanol and dried with compressed air. For surface enlargement, the polymer surface was roughened. For this purpose, adhesive tape (Tesa, Norderstedt, Germany) was glued over the entire polymer and this jerky removed again. The substrate was ethanol washed, dried with compressed air and stored for several hours in ethanol.
- adhesive tape Tesa, Norderstedt, Germany
- the substrate was irradiated for 2 minutes with UV light of wavelength 260 nm (intensity: 5.0 mW cm -2 ).
- the substrate was washed with ethanol, dried with compressed air and stored in ethanol until use as HSTL microarray.
- LSTL microarrays slides (Schröder special glass, Ellerau, Germany) of size 76x26 mm were used as substrates.
- two glass substrates were immersed in a solution of 50 mL dichloromethane (DOM), 0.8 mL triethylamine (1.6% by volume) and 50 mg 4- (dimethylamino) pyridine (DMAP; 1 mg mL 1 ). Then, 0. 2 mL of chloro (dimethyl) vinylsilane (0.4 vol%) was added and the solution was stirred for 2 minutes at room temperature. The substrates were washed with ethanol and dried with compressed air.
- DOM dichloromethane
- DMAP 4- (dimethylamino) pyridine
- a solution of ethanol / HbO (1: 1) and cysteamine hydrochloride (10% by weight) were applied and the substrate was covered with a quartz glass (Electron Microscopy Sciences, Hatfield, USA). Subsequently, the substrate was irradiated for 2 minutes with UV light of wavelength 260 nm (intensity: 5.0 mW cm 2 ). The substrate was washed with ethanol, dried with compressed air and stored in ethanol until use as LSTL microarray.
- a primary or secondary amine 5 induces the reaction by the nucleophilic ring opening of a thiolactone derivative 4, which in turn can undergo a disulfide exchange with a pyridyl disulfide derivative 3.
- the main product is the lipidoid 6 obtained as a by-product, the yellow 2-thiopyridone (7).
- the reaction success can be followed by the liberated thiopyridone 7.
- various lipidides can be obtained. For example, the reactants shown in FIG. 3 were used for lipidoid synthesis in microarrays.
- pyridyl disulfide derivatives 3 and the thiolactone derivatives 4 can be present unreactively side by side in solution (mutually inert reactants)
- mixtures of one pyridyl disulfide derivative 3 and one thiolactone derivative 4 are applied to a first microarray and solutions of amines are applied to a second microarray 5th
- the solutions were applied by means of the "rolling droplet” method.
- a drop of a solution containing the desired reactant (s) over certain areas of the patterned surface of the microarrays was moved by means of a pipette.
- different mixtures of the pyridyl disulfide derivatives 3 and thiolactone derivatives 4 or amines 5 can be applied in rows or columns.
- Solution 1 1, 67 mg rnL -1 thiolactone derivative 4 and 1, 75 mg mL _1 pyridyl disulfide derivative 3 in DMSO
- FIG. 4 shows a stacked microarray in which the amines 5 used vary in columns and different mixtures of pyridyl disulfide derivatives 3 and the thiolactone derivatives 4 were applied line by line. For each combination of the first and second reactants, a get different lipidoid. Subsequently, the two microarrays were separated and confirmed the formation of lipidides by matrix-assisted laser desorption / ionization with time-of-flight analysis (MALDI-TOF).
- MALDI-TOF time-of-flight analysis
- the lipidides obtained were transferred to a MALDI plate by stamping one of the separated microarrays and dried under reduced pressure.
- the matrix used was a-cyano-4-hydroxycinnamic acid (a-CHCA).
- a-CHCA (10 mg mL 1 ) was dissolved in an acetonitrile-water mixture (1: 1, v / v) and mixed with 0.1% trifluoroacetic acid.
- acetonitrile-water mixture (1: 1, v / v
- trifluoroacetic acid 0.1% trifluoroacetic acid
- the analysis was carried out by means of a MALDI TOF / TOF 4800 mass spectrometer (Applied Biosystems, Foster City, CA, USA) in the positive ion reflector mode in a mass range of 600-1000 Da.
- the laser intensity was initially set to 3000 and then readjusted to obtain optimal signals.
- the data was evaluated by the software Data Explorer Software 4.0 (Applied Biosystems). Samples were spotted on a Sciex Opti-TOF 384 well MALDI plate (123x81 mm).
- the formed lipidides could be detected in this way on both separate microarrays.
- Example 2 For the formation of liposomes from the lipidides of Example 2, a microarray of Example 2 containing the reaction products of the first and second reactants was dried under reduced pressure to obtain a dried lipidoid library, each hydrophilic spot of the microarray being one contains dried lipidoid.
- This dried lipid library was overlaid and contacted with a microarray carrying on its surface drops of sodium acetate buffer solution (200 mM, pH 5).
- This microarray was prepared by overlaying an HSTL microarray with the sodium acetate buffer solution and dumping excess solution sideways from the microarray ("standing droplet" method).
- the stacked microarray was incubated for 2 hours at 50 ° C on a heating block. In this way liposomes of the respective lipidides could be formed in the individual drops.
- the HSTL microarray which has drops of the solutions of the formed liposomes in sodium acetate buffer on its surface, was used for the further steps.
- the successful formation of the liposomes was demonstrated by nanotracking analysis (NanoSight LM10-HS system, Malvern Instruments), dynamic light scattering (Malvern Zetasizer Nano ZS, Malvern Instruments) and zeta potential analysis (Malvern Zetasizer Nano ZS, Malvern Instruments).
- lipoplexes For the formation of lipoplexes, another HSTL microarray was prepared, on the surface of which was plunged a solution of the plasmid pCS2-GFP (7.50 ng pL 1 ) in sodium phosphate buffer (33 mM, pH 5).
- the plasmid pCS2-GFP encodes the green fluorescent protein GFP.
- the droplets on the surface of the microarray containing the liposomes formed were contacted with the droplets on the surface of the microarray containing the plasmid solution. Due to the positive charges on the surface of the liposomes, the negatively charged plasmid DNA attaches to the liposomes to form lipoplexes.
- the formation of lipoplexes starting from the lipidides of Example 2 is shown in FIG.
- Example 4 Study of the transfection efficiency of different
- a cell microarray comprising HEK293T cells was provided.
- HEK293T cells were seeded on a gelatin-coated HSTL microarray and incubated for 3 hours at 38 ° C and 5% CO 2 content until the onset of adhesion.
- the sowing of the cells was carried out by means of standing droplet method.
- a large cell suspension T ropfen was formed on the microarray, which extends over all spots of the microarray. This drop was allowed to stand for 30 seconds to allow some cells to settle out of the cell suspension on the surface of the microarray.
- the microarray was then tilted sideways to roll the large drop off the microarray, forming small microdroplets on the microarray.
- the cells can be transfected by superimposing the cell microarray with the lipoplex microarray obtained in Example 3 for 15 minutes at 38 ° C. and 5% CO 2 concentration.
- the expression of GFP could be evaluated by fluorescence microscopy.
- micrographs were taken at a wavelength of 505 nm with a Keyence BZ-9000E fluorescence microscope (Keyence, Osaka, Japan) (objectives: PlanApo 2x 0.10 / 8.5 mm and PlanApo 10x 0.45 / 4.00 mm, resolution: 8 bit; Format: 1360x1024 pixels).
- the images were analyzed using the accompanying software BZ II Analyzer and ImageJ (National Institute of Health, USA, 1.51 n). The individual images were examined for their mean fluorescence intensity.
- Example 1 As an alternative transfection method, reverse transfection of HEK293T cells was investigated by means of microarrays. In contrast to that in Example 3 and 4 described T rans Stammionsmethode can be dispensed with in the reverse T ransfetation on the intermediate step of the formation of liposomes. Rather, the lipidides synthesized in Example 1 are converted directly into lipoplexes.
- a solution of 0.1 M sucrose, 0.04% (w / v) gelatin, 0.002% (w / v) fibronectin and 7.5 ng / pL pCS2-GFP in sodium acetate buffer (on an HSTL microarray) was used ( 50 mM, pH 5).
- Sandwiching with the LSTL-lipidoid microarray from Example 1 on the one hand transferred the lipidides to an HSTL microarray and, on the other hand, also reacted directly to lipoplexes.
- the formation of liposomes and subsequent complexing with plasmid DNA to lipoplexes takes place in a single step.
- the combined microarrays were heated on a heating block for 1.5 hours at 50.degree.
- the obtained lipoplexes were dried for three days under reduced pressure on the microarray.
- the cells were seeded directly onto the microarray of the dried lipoplexes by the standing droplet method as described above.
- the suspension droplet of the cell suspension 60 c 10 4 cells / ml was left on the microarray for 5 seconds before it was tilted.
- FIG. 6 shows a heat map which correlates the fluorescence intensity of the individual spots with the transfection efficiency.
- Microarrays can be used as a platform for combinatorial solid phase synthesis.
- a microarray was used whose hydrophilic areas (round, 3 mm diameter) are functionalized with cysteamine. The hydrophilic areas were treated with hydroxyethyl photolinker Functionalized (HEPL).
- HEPL hydroxyethyl photolinker Functionalized
- 1350 pL of a 0.06 M HERL solution in DMF were mixed with 135 pL of diisopropylcarbodiimide (DIC), 120 mg of 1-hydroxybenzotriazole (HOBt) and 1215 pL of DMF.
- DIC diisopropylcarbodiimide
- HOBt 1-hydroxybenzotriazole
- the microarray was washed with acetone and dried in a stream of nitrogen.
- the amino groups of the cysteamide which did not react with the HERL were protected with a 10% solution of pyridine in acetic anhydride. For this purpose, 10 pL of the solution were applied to each spot, washed off with acetone after 30 minutes and dried in a stream of nitrogen.
- doxorubicin was bound to the HERL.
- 4-formylbenzoic acid was first bound to the HERL as a spacer by applying a solution of 20 mg of 4-formylbenzoic acid and 10 mg of 4- (dimethylamino) pyridine (DMAP) in 1 mL DMF and 100 ⁇ L DIC to the individual spots ( 10 pL per spot) and incubated for 48 hours.
- DMAP dimethylamino) pyridine
- 10 pL each of a solution of 10 mg doxorubicin in 1 L DMSO and 1 pL triethylamine were applied to the individual spots, incubated in the dark for 72 hours, washed with acetone and dried in a stream of nitrogen.
- the individual spots were covered with gelatin and then cells were seeded.
- a solution of 0.066 g of bovine hide gelatin in 3 mL of sterile DMEM medium (10% FCS and 1% Pen / Strep) was applied to the microarray by rolling droplet method, incubated for 1 hour at 37 ° C and then dried in air. Thereafter, a suspension of HeLa cells (0.25 c 10 6 cells per mL) was applied to the individual spots by rolling droplet method.
- the gelatin solution and the cell suspension were also applied to control spots that were not modified with doxorubicin.
- microarray Individual spots of the microarray were irradiated with UV light (365 nm, 4 mW / cm 2 , 15 min). irradiated to cleave the HEPL and release the doxorubicin, the microarray was then incubated for 48 hours at 37 ° C and stained with CalceinAM / propidium iodide.
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Abstract
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018002880.2A DE102018002880A1 (de) | 2018-04-10 | 2018-04-10 | Verfahren zur Behandlung von mindestens einer Zelle mit einem chemischen Syntheseprodukt in einem Microarrav |
| PCT/EP2019/056921 WO2019197122A1 (de) | 2018-04-10 | 2019-03-20 | Verfahren zur behandlung von mindestens einer zelle mit einem chemischen syntheseprodukt in einem microarray |
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| EP3235899B1 (de) * | 2016-04-18 | 2023-04-26 | Karlsruher Institut für Technologie | Verfahren zur herstellung von 3d-zellstrukturen in hängenden tropfen und hängende tropfvorrichtung mit den 3d-zellstrukturen |
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