WO2018150450A1

WO2018150450A1 - Aminocoumarin compound, and aminocoumarin compound-containing resin particles

Info

Publication number: WO2018150450A1
Application number: PCT/JP2017/005284
Authority: WO
Inventors: 健作高梨; 中山　慎
Original assignee: コニカミノルタ株式会社
Priority date: 2017-02-14
Filing date: 2017-02-14
Publication date: 2018-08-23

Abstract

The present invention provides: an aminocoumarin compound having a structure represented by formula (1); and aminocoumarin compound-containing resin particles which include the aminocoumarin compound, and resin particles containing the aminocoumarin compound. In formula (1): each R independently represents hydrogen or a methyl group; Q represents sulfur, oxygen, or N-R1; and R1 represents hydrogen or a methyl group. This aminocoumarin compound is a fluorescent dye which has a longer excitation wavelength than sulfonated coumarin compounds well known in the prior art, and is effectively excited at wavelengths equal to or longer than 475 nm, particularly wavelengths in the vicinity of 500 nm. This aminocoumarin compound is a fluorescent dye which has wavelength characteristics that can used to perform excitation at wavelengths in the range of 475-510 nm, and enable observation in the green light emission region of 510-540 nm. It is anticipated that the aminocoumarin compound will be suitably utilized in immunostaining or the like.

Description

Aminocoumarin compounds and aminocoumarin compound-containing resin particles

The present invention relates to an aminocoumarin compound which is a novel pigment and aminocoumarin compound-encapsulating resin particles obtained by encapsulating the aminocoumarin compound in a resin.

In the current medical environment, a variety of clinical tests are available to provide data for determining whether a subject is affected by the disease or to provide an indication of whether the subject should be dosed. Drugs and laboratory test drugs have been developed and have greatly helped the treatment. By collecting specimens such as blood and tissue sections from subjects, in many cases using immune responses to detect, identify, and quantify specific targets (small molecules, proteins, genes, cells, etc.) Various tests have been developed. For example, the antigen is fluorescently labeled by specifically binding a fluorescently labeled antibody to an in vivo molecule (antigen) whose expression level increases or decreases depending on the presence or absence of the disease. The quantity is quantified. In addition, as an example of a recent clinical test developed to provide an indication of whether to administer to adult T-cell leukemia (ATL), the target of CCR4 Inspection to perform detection was required. The detection of CCR4 has been developed by FACS method for immune reaction to collected blood samples and IHC method for immune reaction to collected tissue samples.The former quantifies (scores) CCR4 by fluorescence detection, The latter quantifies (scores) CCR4 by color detection. By the way, among immunohistochemical techniques for performing an immune reaction on a collected tissue specimen, a technique for binding a fluorescently labeled antibody to an antigen is also known. A technique of binding directly or indirectly and binding it to an antigen is considered useful for achieving high sensitivity.

The need to obtain a lot of information at one time is not limited to immunohistochemical methods, and there is a strong need for medical personnel, and many methods for detecting different targets simultaneously with a plurality of fluorescent dyes are being developed. For example, preparing dyes that exhibit fluorescence in each of the green region, red region, orange region, and far-infrared region, and detecting four types of targets is possible in addition to the FACS method using the above immune reaction. In principle, the ELISA method and the FISH method can be used and commercialized.

A sulfonated coumarin dye is known as a dye emitting in the green region. Examples of the sulfonated coumarin dye include sulfonated coumarin dyes described in Patent Document 1. Since sulfonated coumarin dyes have excellent solubility in water, they are adaptable to fluorescence detection tools based on various immune reactions. However, on the other hand, the fluorescence noise derived from the specimen as described below has been a major factor for inaccurate fluorescence detection and quantification.

For example, in the case of a dye exhibiting green fluorescence, most of the sulfonated coumarin dyes have the maximum wavelength of the excitation spectrum in the wavelength region of 470 nm or less, and the absorption of the excitation light is significantly reduced at a wavelength of 475 nm or more. For this reason, conventional sulfonated coumarin dyes are greatly limited in that they are affected by the wavelength region of another fluorescent dye when performing multiple staining.

Also, in the wavelength region shorter than 475 nm, fluorescence caused by substances (contaminants) other than the fluorescent dye, so-called autofluorescence tends to increase. For this reason, in the conventional immunofluorescence detection using a sulfonated coumarin dye, the background fluorescence intensity is relatively higher than the fluorescence intensity based on the fluorescent dye, and the signal / background ratio (S / B) There was a problem that became low.

JP-A-6-271599

The present invention is intended to solve the problems associated with the prior art as described above, and a sulfonated coumarin dye having a maximum wavelength of an excitation spectrum in a wavelength region of 475 nm or more, for example, a wavelength region of 475 to 510 nm. The purpose is to provide.

As a result of intensive studies to solve the above problems, the present inventors have found that an aminocoumarin compound having a specific structure can solve the above problems, and have completed the present invention.

That is, the aminocoumarin compound of the present invention has a structure represented by the following formula (1).

(In formula (1), each R independently represents a hydrogen atom or a methyl group, Q represents a sulfur atom, an oxygen atom or N—R ¹ , and R ¹ represents a hydrogen atom or a methyl group.)
The aminocoumarin compound is an aminocoumarin compound in which Q in the formula (1) is a sulfur atom, an aminocoumarin compound that is an oxygen atom, or an aminocoumarin compound that is N—R ¹ .

The aminocoumarin compound-encapsulating resin particles of the present invention have the aminocoumarin compound and resin particles that encapsulate the aminocoumarin compound.

In the aminocoumarin compound-encapsulating resin particles, the resin particles are preferably amino resin particles.

The aminocoumarin compound-containing resin particles preferably have an excitation spectrum maximum wavelength of 475 to 510 nm and a fluorescence spectrum maximum wavelength of 510 to 540 nm.

The aminocoumarin compound of the present invention has an excitation wavelength longer than that of the conventionally known sulfonated coumarin compound described in Patent Document 1, and has a wavelength of 475 or more, particularly about 500 nm. It is a fluorescent dye that is effectively excited. The aminocoumarin compound of the present invention is a fluorescent dye that can be excited in the wavelength range of 475 to 510 nm and observed in the green light emission region of 510 to 540 nm by utilizing this wavelength characteristic. It can be expected to be used appropriately.

The aminocoumarin compound of the present invention has a structure represented by the following formula (1).

In formula (1), 12 R's each independently represent a hydrogen atom or a methyl group.

In the formula (1), Q represents a sulfur atom, an oxygen atom or N—R ¹ . R ¹ represents a hydrogen atom or a methyl group. The aminocoumarin compound of the present invention has a benzothiazole structure when Q in formula (1) is a sulfur atom, has a benzoxazole structure when Q is an oxygen atom, and has benzoxazole structure when it is N—R ^1. It will have an imidazole structure.

The sulfonic acid group SO ₃ H contained in the formula (1) is bonded to any of the four carbon atoms that can be bonded to the benzene ring contained in the benzothiazole structure, benzoxazole structure or benzimidazole structure. May be.

In the aminocoumarin compound of the present invention, the nitrogen atom bonded to the coumarin structure forms two 6-membered rings together with the four carbon atoms of the benzene ring contained in the coumarin structure, that is, the amino group of aminocoumarin is The structure is different from known sulfonated coumarin compounds described in Patent Document 1 and the like in that it has a julolidine structure.

The aminocoumarin compound of the present invention having such a structure has an excitation wavelength longer than that of a known sulfonated coumarin compound, and has an excitation spectrum maximum wavelength of 475 nm or more, for example, 475 to 510 nm. The aminocoumarin compound of the present invention has a longer emission wavelength than known sulfonated coumarin compounds, and has a maximum fluorescence spectrum wavelength of 510 nm or more, for example, 510 to 540 nm. Here, the “excitation spectrum maximum wavelength” means a wavelength exhibiting a maximum in the excitation spectrum. “Fluorescence spectrum maximum wavelength” means a wavelength exhibiting a maximum in a fluorescence spectrum.

The aminocoumarin compound of the present invention represented by the formula (1) has a feature that the emission intensity is higher than that of an aminocoumarin compound formed by substituting the sulfone group of the aminocoumarin compound with a hydrogen atom.

The aminocoumarin compound of the present invention can be produced, for example, by a method of sulfonating a coumarin compound having a structure represented by the following formula (2). Specifically, the aminocoumarin compound of the present invention is produced by adding 1 ml of fuming sulfuric acid to 0.1 g of the coumarin compound represented by the formula (2) and reacting at 0 to 140 ° C. for 1 to 8 hours. be able to.

(R and Q in formula (2) have the same meanings as R and Q in formula (1), respectively).
The aminocoumarin compound-encapsulating resin particles of the present invention have the aminocoumarin compound and resin particles that encapsulate the aminocoumarin compound. The aminocoumarin compound-encapsulating resin particles of the present invention can be suitably used for immunostaining and the like.

The aminocoumarin compound encapsulated in the resin particles is as described above.

The resin particles encapsulating the aminocoumarin compound are not particularly limited as long as the aminocoumarin compound can be encapsulated, but is preferably a thermosetting resin. Since the thermosetting resin has a three-dimensional network structure, the dye encapsulated in the thermosetting resin is not easily detached from the resin particles, and is suitable for immunostaining and the like. Examples of the thermosetting resin include melamine resin, urea resin, aniline resin, guanamine resin, phenol resin, xylene resin, and furan resin. Among these, amino resins such as melamine resin and urea resin are particularly preferable because they can more effectively suppress the release of the pigment from the resin particles.

The amount of the aminocoumarin compound encapsulated in the resin particles is not particularly limited, and when the aminocoumarin compound-encapsulated resin particles are used for immunostaining, it may be an amount that can ensure a detectable luminance.

The average particle diameter of the aminocoumarin compound-encapsulating resin particles is not particularly limited, but when used for immunostaining, it is usually 40 to 500 nm, preferably 50 to 200 nm. If the average particle size of the aminocoumarin compound-encapsulating resin particles exceeds 500 nm, there may be a problem with dyeability, and if it is less than 40 nm, there may be a problem with visibility.

The average particle diameter is calculated as an average value obtained by measuring the particle diameter of 1000 aminocoumarin compound-encapsulated particles by SEM observation.

The aminocoumarin compound-encapsulating resin particles of the present invention can be produced according to known methods for producing dye-encapsulating resin particles.

For example, the aminocoumarin compound-encapsulating resin particles of the present invention can be produced by polymerizing a monomer raw material for resin synthesis in the presence of an aminocoumarin compound. Specifically, a monomer raw material for resin synthesis is added to an aqueous solution containing an aminocoumarin compound and a surfactant, and usually at 55 to 75 ° C., preferably 68 to 72 ° C., for about 10 minutes, preferably 10 to 15 Stir vigorously for minutes. Thereafter, a polymerization initiator is added, and emulsion polymerization is carried out by stirring vigorously at 55 to 75 ° C., preferably 68 to 72 ° C. for 4 to 24 hours, preferably 4 to 5 hours. Further, the liquid temperature is raised to 80 to 90 ° C., preferably 80 to 82 ° C., and the mixture is vigorously stirred for 30 to 60 minutes, preferably 30 to 40 minutes. The reaction solution is usually divided into agglomerates and a particle dispersion as a supernatant. The particle dispersion is recovered from the reaction solution. This particle dispersion is centrifuged to remove the dispersion medium that is a supernatant, and then ultrapure water is added to the precipitate for ultrasonic dispersion. The steps of centrifugation, addition of ultrapure water to the precipitate, and ultrasonic dispersion are repeated several more times. As a result, an aqueous dispersion of aminocoumarin compound-encapsulating resin particles is obtained.

The monomer raw material for resin synthesis is a raw material capable of forming the resin particles by polymerization.

The amount of aminocoumarin compound added is usually 1 to 50 mg with respect to 1 g of monomer raw material for resin synthesis.

The surfactant is not particularly limited, and a surfactant that is used in a usual emulsion polymerization reaction can be used. As the surfactant, all anionic, nonionic and cationic surfactants can be used. Examples of the anionic surfactant include sodium dodecylbenzenesulfonate. Examples of nonionic surfactants include polyethylene glycol and polyoxyethylene alkyl ether. Examples of the cationic surfactant include dodecyltrimethylammonium bromide. Surfactant may be used individually by 1 type, or may use 2 or more types together.

As commercially available surfactants, for example, “Emulgen” (registered trademark, manufactured by Kao Corporation) and “Neoperex” (registered trademark, manufactured by Kao Corporation) can be suitably used. The active ingredient of emulgen is polyoxyethylene alkyl ether, and the active ingredient of neoperex is sodium dodecylbenzenesulfonate.

The addition amount of the surfactant is usually 1 to 3 mg per 1 g of the monomer raw material for resin synthesis.

Examples of the polymerization initiator include thermal polymerization initiators such as azo compounds and peroxides that generate radicals by heat. V-50 (2,2′-Azobis (2-methylpropionamide) dihydrochloride is preferred as the azo compound. The peroxide is preferably ammonium persulfate. The polymerization initiator may be a redox polymerization initiator.

The addition amount of the polymerization initiator is usually 0.1 to 1.5 mg, preferably 0.3 to 0.45 mg per 1 g of the monomer raw material for resin synthesis.

The aminocoumarin compound-encapsulating resin particle of the present invention produced by encapsulating the aminocoumarin compound represented by the formula (1) in the resin is formed by substituting the sulfo group of the aminocoumarin compound with a hydrogen atom. Compared with the aminocoumarin compound-encapsulating resin particles produced by encapsulating in a resin, the emission intensity tends to be strong. This is because the aminocoumarin compound represented by the formula (1) is more easily included in the resin than the aminocoumarin compound formed by replacing the sulfone group of the aminocoumarin compound with a hydrogen atom. It is presumed that it is taken in.

[Example 1]
In a 20 mL vial tube, 600 mg of the compound (3) represented by the following formula (3) was added, 6 mL of fuming sulfuric acid was added, and the mixture was stirred at 25 ° C. for 4 hours to carry out the reaction. Progress of the reaction was confirmed by TLC. Specifically, a part of the reaction solution was neutralized with an aqueous NaOH solution, ethanol was added to the reaction solution, and TLC was performed using a solution in which CHCl ₃ was mixed at a ratio of 2 and MeOH at a ratio of 3. The Rf value of the target product was 0.73 against the Rf value of 0.88 of the raw material, and the convergence of the reaction and the generation of the target product were confirmed from the TLC data.

Ice was put in a 50 mL vial tube until the 8th minute (30 mL), and the reaction solution was added little by little. A suspension in which the produced dye was suspended was obtained. The suspension was centrifuged, the supernatant was removed, and the dye was recovered as a precipitate. The precipitate is dispersed in 10 mL of pure water, the dispersion is centrifuged, the supernatant liquid is removed, the precipitate is recovered, dispersed again in 10 mL of pure water, and the dispersion is centrifuged to remove the supernatant. Removed and recovered the precipitate. The recovered precipitate was dispersed with ethanol, the dispersion was centrifuged, and the supernatant was removed to obtain an aminocoumarin compound I represented by the following formula (I) as a precipitate. The yield of aminocoumarin compound I was 80%.

After the obtained precipitate was dried, the obtained powder was added to pure water, then neutralized with an aqueous NaOH solution to dissolve the precipitate, and the pH of the solution was adjusted to 7-8. This solution was dried with a freeze dryer to obtain Na salt of aminocoumarin compound I. It was confirmed that the aminocoumarin compound I dissolves quickly in water by using Na salt, whereas the sulfonic acid form has poor solubility in water.

The aminocoumarin compound I was dissolved in a solvent obtained by mixing double distilled water (DDW) 10 and ethanol at a ratio of 1 to prepare a 10 nM solution. The fluorescence intensity at the excitation spectrum maximum wavelength, the fluorescence spectrum maximum wavelength, and the excitation wavelength 490 nm was measured for this solution using a spectrofluorophotometer F-7000 (manufactured by Hitachi, Ltd.). The results are shown in Table 1. The excitation spectrum was measured by fixing the fluorescence wavelength to be detected and scanning the wavelength of the excitation light. In the fluorescence spectrum, the fluorescence intensity was measured with the wavelength of excitation light fixed.

Further, 1H-NMR measurement of the raw material before sulfonation and the present compound was carried out to confirm that the desired sulfonated product was obtained.
1H-NMR before sulfonation (400 MHz, CDCl3) (compound (3)): δ = 1.31 (s, 6H), 1.59 (s, 6H), 1.77 (t, 2H), 1.83 (t, 2H), 3.29 (t, 2H), 3.38 (t, 2H), 7.30 (s, 1H), 7.36 (t, 1H), 7.47 (t, 1H), 7.94 (d, 1H), 8.00 (d, 1H), 8.83 ( s, 1H)
1H-NMR after sulfonation (400 MHz, CD3OD) (aminocoumarin compound I): δ = 1.37 (s, 6H), 1.59 (s, 6H), 1.83 (s broad, 2H), 1.89 (s broad, 2H) , 3.52 (s broad, 2H), 3.61 (s broad, 2H), 7.46 (s, 1H), 7.95 (d, 1H), 8.11 (d, 1H), 8.53 (s, 1H), 8.69 (s, 1H )

[Example 2]
An aminocoumarin compound II represented by the following formula (II) was prepared in the same manner as in Example 1 except that the compound (4) represented by the following formula (4) was used instead of the compound represented by the formula (3). Got. The yield of aminocoumarin compound II was 82%.

Using the aminocoumarin compound II, the excitation spectrum maximum wavelength, the fluorescence spectrum maximum wavelength, and the fluorescence intensity were measured in the same manner as in Example 1. The results are shown in Table 1.
1H-NMR before sulfonation (400 MHz, CDCl3) (compound (4)): δ = 1.99 (m, 4H), 2.79 (t, 2H), 2.94 (t, 2H), 3.33 (s broad, 4H), 7.05 (s, 1H), 7.34 (t, 1H), 7.46 (t, 1H), 7.92 (d, 1H), 8.00 (d, 1H), 8.80 (s, 1H)
1H-NMR after sulfonation (400 MHz, CD3OD) (aminocoumarin compound II): δ = 1.95 (m, 4H), 2.78 (t, 2H), 2.84 (t, 2H), 3.36 (m, 4H), 7.20 (s, 1H), 7.89 (d, 1H), 7.94 (d, 1H), 8.38 (s, 1H), 8.80 (s, 1H)

[Example 3]
The aminocoumarin compound III represented by the following formula (III) was prepared in the same manner as in Example 1 except that the compound (5) represented by the following formula (5) was used instead of the compound represented by the formula (3). Got. The yield of aminocoumarin compound III was 80%.

Excitation spectrum maximum wavelength and fluorescence spectrum maximum wavelength were measured in the same manner as in Example 1 using aminocoumarin compound III. The results are shown in Table 1.

[Example 4]
The aminocoumarin compound IV represented by the following formula (IV) was prepared in the same manner as in Example 1 except that the compound (6) represented by the following formula (6) was used instead of the compound represented by the formula (3). Got. The yield of aminocoumarin compound IV was 75%.

Excitation spectrum maximum wavelength and fluorescence spectrum maximum wavelength were measured in the same manner as Example 1 using aminocoumarin compound IV. The results are shown in Table 1.
1H-NMR before sulfonation (400 MHz, CDCl3) (compound (6)): δ = 1.98 (m, 4H), 2.78 (t, 2H), 2.93 (t, 2H), 3.33 (m, 4H), 6.98 (s, 1H), 7.30 (d, 1H), 7.31 (d, 1H), 7.57 (t, 1H), 7.78 (t, 1H), 8.50 (s, 1H)
1H-NMR after sulfonation (400 MHz, CD3OD) (aminocoumarin compound IV): δ = 1.97 (s broad, 4H), 2.80 (m, 2H), 2.87 (m, 2H), 3.39 (m, 4H), 7.19 (s, 1H), 7.72 (d, 1H), 7.87 (d, 1H), 8.05 (s, 1H), 8.65 (s, 1H)

[Example 5]
The aminocoumarin compound V represented by the following formula (V) was prepared in the same manner as in Example 1 except that the compound (7) represented by the following formula (7) was used instead of the compound represented by the formula (3). Got. The yield of aminocoumarin compound V was 70%.

Using the aminocoumarin compound V, the excitation spectrum maximum wavelength and the fluorescence spectrum maximum wavelength were measured in the same manner as in Example 1. The results are shown in Table 1.
1H-NMR before sulfonation (400 MHz, CDCl 3) (compound (7)): δ = 1.98 (m, 4H), 2.78 (t, 2H), 2.93 (t, 2H), 3.33 (m, 4H), 6.98 (s, 1H), 7.30 (d, 1H), 7.31 (d, 1H), 7.57 (t, 1H), 7.78 (t, 1H), 8.50 (s, 1H)
1H-NMR after sulfonation (400 MHz, CD3SOCD3) (aminocoumarin compound V): δ = 1.97 (s broad, 4H), 2.80 (m, 2H), 2.87 (m, 2H), 3.39 (m, 4H), 7.19 (s, 1H), 7.72 (d, 1H), 7.87 (d, 1H), 8.05 (s, 1H), 8.65 (s, 1H)

[Example 6]
The aminocoumarin compound VI represented by the following formula (VI) was prepared in the same manner as in Example 1 except that the compound (8) represented by the following formula (8) was used instead of the compound represented by the formula (3). Got. The yield of aminocoumarin compound VI was 75%.

Excitation spectrum maximum wavelength and fluorescence spectrum maximum wavelength were measured in the same manner as in Example 1 using aminocoumarin compound VI. The results are shown in Table 1.

[Comparative Example 1]
The fluorescence intensity was measured in the same manner as in Example 1 except that aminocoumarin compound i represented by the following formula (i) was used instead of aminocoumarin compound I. The results are shown in Table 1.

[Comparative Example 2]
The aminocoumarin represented by the following formula (ii) was prepared in the same manner as in Example 1 except that the aminocoumarin compound (i) represented by the above formula (i) was used instead of the compound represented by the formula (3). Compound ii was obtained.

Using the aminocoumarin compound ii, the excitation spectrum maximum wavelength, the fluorescence spectrum maximum wavelength, and the fluorescence intensity were measured in the same manner as in Example 1. The results are shown in Table 1.
1H-NMR before sulfonation (400 MHz, CDCl3) (aminocoumarin compound (i)): δ = 1.25 (t, 6H), 3.46 (q, 4H), 6.56 (s, 1H), 6.67 (d, 1H) , 7.36 (t, 1H), 7.48 (m, 2H), 7.99 (d, 1H), 8.01 (d, 1H), 8.90 (s, 1H)
1H-NMR after sulfonation (400 MHz, CD3SOCD3) (aminocoumarin compound ii): δ = 1.67 (t, 6H), 3.51 (m, 4H), 6.68 (s, 1H), 6.86 (d, 1H), 7.41 (d, 1H), 7.78 (d, 1H), 7.91 (d, 1H), 8.30 (s, 1H), 9.03 (s, 1H)

[Comparative Example 3]
Aminocoumarin compound iii represented by the following formula (iii) in the same manner as in Example 1 except that the compound (9) represented by the following formula (9) was used instead of the compound represented by the formula (3). Got.

Using the aminocoumarin compound iii, the excitation spectrum maximum wavelength and the fluorescence spectrum maximum wavelength were measured in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 4]
The aminocoumarin compound iv represented by the following formula (iv) was prepared in the same manner as in Example 1 except that the compound (10) represented by the following formula (10) was used instead of the compound represented by the formula (3). Got.

Using the aminocoumarin compound iv, the excitation spectrum maximum wavelength and the fluorescence spectrum maximum wavelength were measured in the same manner as in Example 1. The results are shown in Table 1.

[Example 7]
14.4 mg of aminocoumarin compound I was added to 22 mL of water and dissolved. To this solution, 2 mL of a 5% aqueous solution of an emulsion (registered trademark) 430 (polyoxyethylene oleyl ether, manufactured by Kao Corporation) of an emulsifier for emulsion polymerization was added.

The solution was heated to 70 ° C. while stirring on a hot stirrer, and then 0.65 g of melamine resin raw material Nicalak MX-035 (manufactured by Nippon Carbide Industries Co., Ltd.) was added to the solution. To this solution was added 1000 μL of a 10% aqueous solution of dodecylbenzenesulfonic acid (manufactured by Kanto Chemical Co., Ltd.) as a reaction initiator, and the mixture was heated and stirred at 70 ° C. for 50 minutes, then heated to 90 ° C. and stirred for 20 minutes. By the above operation, aminocoumarin compound-encapsulating resin particles I were obtained.

The resulting dispersion of aminocoumarin compound-encapsulating resin particles I was washed with pure water to remove excess resin raw materials and impurities such as aminocoumarin compounds. Specifically, the mixture was centrifuged at 20000 G for 15 minutes in a centrifuge (Kubota Micro Cooling Centrifuge 3740), and after removing the supernatant, ultrapure water was added and ultrasonically irradiated to redisperse. Centrifugation, supernatant removal, and washing by redispersion in ultrapure water were repeated 5 times.

The average particle size of the aminocoumarin compound-encapsulating resin particles I was calculated from the particle diameter of the SEM image. The results are shown in Table 2.

Aminocoumarin compound-encapsulating resin particle I is diluted to 0.0189 mg / mL, 100 uL is taken, put into a fluorescence microcell, and using a spectrofluorometer F-7000 (manufactured by Hitachi, Ltd.) at an excitation wavelength of 490 nm. The fluorescence intensity was measured. The results are shown in Table 2.

The aminocoumarin compound-encapsulating resin particles I were subjected to the following FACS (Fluorescence Activated Cell Sorting) and FISH (Fluorescence in situ hybridization).
(FACS evaluation)
Maleimide was introduced into the end of the aminocoumarin compound-encapsulating resin particle I using NHS-PEG (polyethylene glycol) -maleimide reagent, and a thiolated anti-HER2 antibody was bound thereto.

The frozen cells of COLO201 obtained from ATCC (American Type Culture Collection) are thawed in a 37 ° C constant temperature bath, and about 1 × 10 ⁵ cells / mL are suspended in the medium, and the first culture is performed in a 25 cm ² flask. Carried out. Trypsinize the culture medium with about 1 × 10 ⁶ cells / mL and dilute a part of the cells detached from the flask with Cell bunker solution (10% DMSO). did. The remaining cells were subcultured and cultured to a target amount of about 5 × 10 ⁷ cells. After floating and recovering with a scraper, a part was used for FACS measurement.

HER2 protein present on the surface of cultured cells was measured with FACSCalibur (trade name; manufactured by Becton Dickinson). A mixture of the PBS solution of aminocoumarin compound-encapsulating resin particles I and COLO201 cultured as described above was incubated at 4 ° C. for 30 minutes, 100 μl of the mixture was taken into a measuring tube, and Assay Diluent (trade name, Becton It was diluted to 2 ml with Deckson Corporation and injected into FACSCalibur.

The results are shown in Table 2. The diagram shown as a result of FACS in Table 2 is a histogram with the horizontal axis representing the fluorescence intensity of 530 nm by 490 nm excitation light and the vertical axis representing the count number. In this figure, the fluorescence intensity is stronger, that is, brighter as the histogram is shifted to the right side. In this figure, the result of Example 7 is shown in comparison with the result of Comparative Example 5 using the following aminocoumarin compound-encapsulating resin particles i. The same applies to other examples and comparative examples 6 to 8. A histogram having a peak near the fluorescence intensity 90 is the histogram of Comparative Example 5, and a histogram having a peak near the fluorescence intensity 500 is the histogram of Example 7. It can be seen that the histogram of Example 7 is considerably shifted to the right from the histogram of Comparative Example 5. From this result, it can be seen that the aminocoumarin compound-encapsulating resin particles I of Example 7 have a stronger fluorescence intensity and brighter than the aminocoumarin compound-encapsulating resin particles i of Comparative Example 5.
(FISH evaluation)
[Preparation of BAC probe]
CellBiochemBiophys. In accordance with the method described in 2006; 45 (1) 59, a nucleic acid molecule was prepared as follows. For 1 μg (5 μL) of the HER2-DNA clone (about 150 kbp) purchased from GSP, according to the protocol of the kit for nick translation (product name “GSP-Nick Translation Kit” K-015, manufactured by GSP) As described below, dTTP of the HER2 DNA clone (nucleic acid molecule) was replaced with DNP-labeled dUTP by the nick translation method.

[Standard biotin labeling method by nick translation]
First, the following reagents were mixed in a centrifuge tube.
・ 10 × NickBuffer (Tris-HCl [pH 7.2], MgSO ₄ , DTT): 2.5 μL
・ BSA (Nuclease-free BSA) ・・・ 1.5μL
DNTP mix (dATP, dCTP, dCTP): 5 μL
・ DTTP ... 0.5μL,
・ DNP-11-dUTP (Product No. NEL551001EA, PerkinElmer, 250 nmol / 25 μL) ... 0.15 μL
・ Pure water (Nuclease free water) ・・・ 3μL
・ Aqueous solution of about 150 kbp 1 μg of the HER2-DNA clone 5 μL
DNA Polymerase I (Tris-HCl [pH 7.5], EDTA, DTT, glyceryl) ... 1 μL
・ DNaseI ... 5μL
Next, the reaction was performed at 15 ° C. for 4 hours, and the reaction was stopped by heating at 70 ° C. for 10 minutes. 25 μL of distilled water was added to the centrifuge tube after the reaction. The biotin-labeled BAC probe reaction solution was purified by a microspin column for nucleic acid purification (“MicroSpin S-200HR Column” manufactured by GE Healthcare, product number “# 27-5120-01”).

To this solution, about 5.56 μL of 3M sodium acetate solution (pH 5.2) and 150 μL of 100% ethanol were added, and left at −20 ° C. for 1 hour or longer. A precipitate was formed by centrifugation at 16000 rpm for 10 minutes at 4 ° C. Furthermore, 500 μL of 70% ethanol was added and centrifuged at 16000 rpm for 1 minute at 4 ° C. to remove the supernatant. The precipitate was completely dissolved by adding 5 to 10 μL of distilled water to obtain a DNP-labeled BAC probe solution having a final concentration of 1 μg / 250 μL.

[Preparation of DNA probe in which aminocoumarin compound-encapsulating resin particles and BAC probe are bound]
NHS-PEG (polyethylene glycol) -maleimide reagent was reacted with the surface amino group of the aminocoumarin compound-encapsulating resin particle I to introduce maleimide, and an anti-DNP antibody was bound thereto.

A solution containing 25 μL (concentration 1 μg / 250 μL) of a DNP-labeled BAC probe by nick translation and 1.0 μL (50 nmol / 50 μL) of aminocoumarin compound-encapsulating resin particles surface-modified with an anti-DNP antibody was mixed to room temperature. Then, a binding reaction was performed for 30 minutes to obtain a DNA probe reagent for HER-2 detection.

[Storage of DNA probes]
Hybridization buffer (25% deionized formamide, 2 × SSC, 200 ng / μL salmon sperm DNA, 5 × Denhardt's solution, 50 mM sodium phosphate, pH 7.0, 1 mM EDTA) Diluted to a final concentration of 1-5 ng / μL. If necessary, free ligand was removed with an S300 size spin column (Amersham Biosciences, Piscataway, NJ). If not used immediately, the DNA probe was stored frozen at -20 ° C.

[Measure HER2 gene copy number]
The copy number of the HER2 gene was measured by FISH. As shown below, FISH includes deparaffinization, specimen slide pretreatment, enzyme treatment, specimen fixing treatment, probe preparation, specimen slide DNA denaturation treatment, hybridization treatment, slide glass washing treatment, and DAPI. The staining process was performed in this order.

[Deparaffinization]
Deparaffinization was performed by treating a specimen slide of a HER2-positive stained control specimen (“HER2-FISH Control Slide Code PS-09006” manufactured by Pathology Laboratories) in the order of (1) to (4) below. . (1) Immerse in Hemo-De for 10 minutes at room temperature. (2) Immerse the specimen slide in new Hemo-De for 10 minutes at room temperature. Repeat the same operation three times. (3) The specimen slide is immersed in 100% ethanol at room temperature for 5 minutes, washed twice, and dehydrated. (4) The specimen slide is air-dried or dried on a slide warmer at 45 to 50 ° C.

[Pretreatment of specimen slide]
In order to improve the reachability of the DNA probe, the specimen slide was pretreated in the following order (1) to (6) to remove proteins from the cell membrane and the nuclear membrane. (1) Treat the specimen slide with 0.2 mol / L HCl at room temperature for 20 minutes. (2) Immerse the specimen slide in purified water for 3 minutes. (3) The specimen slide is immersed in a washing buffer solution (2 × SSC: standard saline citrate) for 3 minutes. (4) The specimen slide is immersed in a pretreatment solution (1N NaSCN) at 80 ° C. for 30 minutes. (5) Immerse the specimen slide in purified water for 1 minute. (6) The specimen slide is immersed in a washing buffer solution (2 × SSC) for 5 minutes, and this immersion operation is repeated twice.

[Enzyme treatment]
The sample treatment that had been pretreated was subjected to enzyme treatment by performing the following treatments (1) to (4) in this order. (1) Take out the pretreated specimen slide, attach the lower end of the slide glass to a paper towel, and remove excess washing buffer. (2) The specimen slide is immersed in a protease solution heated to 37 ° C. for 10 to 60 minutes. This immersion treatment is performed with 25 mg protease (2500-3000 Units / mg) [pepsin] / 1M NaCl [pH 2.0] in 50 mL at 37 ° C. for 60 minutes) in order to decompose cell membrane and nuclear membrane proteins, particularly collagen. It is desirable to process. (3) Immerse the specimen slide in the washing buffer for 5 minutes. This operation is repeated twice. (4) The specimen slide is air-dried or dried on a slide warmer at 45 to 50 ° C. for 2 to 5 minutes.

[Specimen fixation]
As the specimen fixing process, the following processes (1) to (3) were performed on the specimen slide that had been pretreated. (1) The specimen slide is immersed in 10% neutral buffered formalin (“4% paraformaldehyde / phosphate buffer” manufactured by Wako Pure Chemical Industries, Ltd., product number 163-1004) at room temperature for 10 minutes. (2) Immerse the specimen slide in the washing buffer for 5 minutes. Repeat the same operation twice. (3) The specimen slide is air-dried or dried on a slide warmer at 45 to 50 ° C. for 2 to 5 minutes.

[Preparation of probe]
The solution of the DNA probe reagent that had been stored in a frozen state was returned to room temperature, the viscosity of the solution was sufficiently reduced to such an extent that a pipetting operation capable of collecting an accurate volume was possible, and the solution was mixed with a vortex mixer or the like.

[Denaturation of sample slide DNA]
As the DNA denaturation treatment on the specimen slide, the following treatments (1) to (8) were performed on the specimen slide on which the specimen was fixed. (1) Preliminarily place a wet box (airtight container, taped on the side with a paper towel) placed in a 37 ° C incubator with a paper towel moistened with water before the specimen slide was created. Heat. (2) Make sure that the pH of the denaturing solution (70% formamide / SSC [150 mM NaCl, 15 mM sodium citrate]) is pH 7.0 to 8.0 at room temperature. The denaturing solution is placed in a coplinger and warmed in a hot tub until the solution is 72 ° C. ± 1 ° C. (placed in a 72 ± 1 ° C. hot tub for at least 30 minutes). (3) Mark with a diamond pen or the like so as to surround the area behind the specimen slide so that the part of the hybridization area can be identified. (4) The specimen slide is immersed in a copliner containing a denaturing solution at 72 ± 1 ° C. to denature the DNA on the specimen slide. (5) Using tweezers, remove the specimen slide from the denaturing solution and immediately place it in normal temperature 70% ethanol. Shake the slide to remove formamide. Immerse the specimen slide for 1 minute. (6) Remove the specimen slide from 70% ethanol, place it in 85% ethanol and shake the slide to remove formamide. Immerse the specimen for 1 minute. Repeat the same procedure twice with 100% ethanol. (7) Attach the lower end of the specimen slide glass to a paper towel to remove ethanol, and wipe the back side of the slide glass with a paper towel. (8) The specimen slide is air-dried with a dryer or dried with a slide warmer at 45-50 ° C. for 2-5 minutes.

[Hybridization]
By performing the following steps (1) to (3) in this order on the sample slide subjected to the above denaturation treatment, 10 μL (10 to 50 ng) of the DNA probe prepared as described above is applied to the sample slide. Hybridization treatment was carried out using this. (1) Add 10 μL of the prepared DNA probe to the hybridization area of the specimen slide, and immediately cover the probe with a 22 mm × 22 mm cover glass to spread the probe uniformly. Prevent bubbles from entering the hybridization area. (2) Seal the cover glass with a paper bond. (3) Place the specimen slide in a pre-warmed moist box, cover it, and perform hybridization in a 37 ° C. incubator for 14 to 18 hours.

[Washing of slide glass]
By performing the following steps (1) to (6) in this order on the sample slide subjected to the above hybridization treatment, the sample slide was washed. (1) Add the post-hybridization wash buffer (2 × SSC / 0.3% NP-40) to the copliner. Preheat in a hot tub until the post-hybridization wash buffer is 72 ° C. ± 1 ° C. (place in a 72 ° C. ± 1 ° C. hot tub for at least 30 minutes). (2) Prepare another coplinger containing the post-hybridization washing buffer and keep it at room temperature. (3) Remove the paper bond seal with tweezers. (4) Place the specimen slide in the post-hybridization wash buffer. Wait for the coverglass to spontaneously peel off in solution. (5) Remove the specimen slide from the solution, remove the excess solution, and immerse in a post-hybridization wash buffer heated to 72 ± 1 ° C. for 2 minutes. Here, it is desirable not to exceed 2 minutes as the temperature exceeding 73 ° C. or the processing time. (6) Remove the specimen slide from the copliner and air dry under light shielding (closed drawer, closed cabinet shelf, etc.).

[DAPI staining]
DAPI staining was performed as follows. First, 10 μL of DAPI counterstain was added to the hybridization area of the specimen slide. Next, after hybridization treatment, DAPI staining (2 μg / mL PBS) is performed at 25 ° C. for 10 minutes in order to count the number of cells. The cell nucleus is stained, covered with a cover glass, and the specimen slide is covered until signal measurement. Stored protected from light. DAPI (4 ′, 6-Diamidino-2-phenylindole, Dihydrochloride) used Molecular Probes (D1306).

[Observation]
<Fluorescence microscope observation>
In the fluorescence microscope observation, the tissue section having been stained with the HER2 gene was subjected to fluorescence microscope Zeiss imager (Camera: MRm monochrome / with cooling function, eye lens x10, objective lens x60 oil immersion, Zeiss filter set HE46 (excitation filter 500 nm ± 12.5 nm, beam splitter 515 nm, fluorescence filter 535 nm ± 15 nm)), and fluorescence emission of aminocoumarin compound-containing resin particles of the hybridized DNA probe was obtained as a fluorescence image (fluorescence still image).

Table 2 shows the result of measuring the number of bright spots from the obtained fluorescence image. The difference in the number of measured starting points was observed in the comparative example, while it was relatively difficult to find the green bright spot (signal) from the green background (noise). This is because in the case of the example, since the luminance is high, detection can be performed without being affected by noise.
[Examples 8 to 12]
In Examples 8 to 12, aminocoumarin compound-encapsulating resin particles II to VI were prepared in the same manner as in Example 7 except that aminocoumarin compounds II to VI were used in place of aminocoumarin compound I, respectively.

Using the aminocoumarin compound-encapsulating resin particles II to VI, the average particle size measurement, fluorescence intensity measurement, FACS, and FISH were performed in the same manner as in Example 7. However, FACS was not performed in Examples 10 and 11. The results are shown in Table 2.
[Comparative Examples 5 to 8]
In Comparative Examples 5 to 8, aminocoumarin compound-encapsulating resin particles i to iv were prepared in the same manner as in Example 7 except that aminocoumarin compounds i to iv were used instead of aminocoumarin compound I, respectively.

Using the aminocoumarin compound-encapsulating resin particles i to iv, the average particle diameter measurement, fluorescence intensity measurement, FACS and FISH were performed in the same manner as in Example 7. The results are shown in Table 3. From the FACS results shown in Table 3, it can be seen that in Comparative Examples 6 to 8, the histogram is not so shifted from the histogram of Comparative Example 5 even though the fluorescent dye is sulfonated.

Claims

An aminocoumarin compound having a structure represented by the following formula (1).

(In formula (1), each R independently represents a hydrogen atom or a methyl group, Q represents a sulfur atom, an oxygen atom or N—R 1 , and R 1 represents a hydrogen atom or a methyl group.)
The aminocoumarin compound according to claim 1, wherein Q in the formula (1) is a sulfur atom.
The aminocoumarin compound according to claim 1, wherein Q in the formula (1) is an oxygen atom.
The aminocoumarin compound according to claim 1 , wherein Q in the formula (1) is NR 1 .
An aminocoumarin compound-encapsulating resin particle comprising the aminocoumarin compound according to claim 1 and resin particles encapsulating the aminocoumarin compound.
The aminocoumarin compound-encapsulating resin particles according to claim 5, wherein the resin particles are amino resin particles.
The aminocoumarin compound-encapsulating resin particles according to claim 5 or 6, wherein the excitation spectrum maximum wavelength is 475 to 510 nm and the fluorescence spectrum maximum wavelength is 510 to 540 nm.