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JP5034302B2 - Fluorescent label - Google Patents

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JP5034302B2
JP5034302B2 JP2006115899A JP2006115899A JP5034302B2 JP 5034302 B2 JP5034302 B2 JP 5034302B2 JP 2006115899 A JP2006115899 A JP 2006115899A JP 2006115899 A JP2006115899 A JP 2006115899A JP 5034302 B2 JP5034302 B2 JP 5034302B2
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fluorescent label
derivative
hydrophilic polymer
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fluorescent
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JP2006329976A (en
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正巳 杉山
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Fujirebio Inc
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Description

本発明は、多数の蛍光体がポリエーテル誘導体を介して親水性重合体に結合された構造からなる、高感度の蛍光標識体および該標識体で標識化された蛍光標識認識物に関するものである。   The present invention relates to a highly sensitive fluorescent label comprising a structure in which a large number of phosphors are bonded to a hydrophilic polymer via a polyether derivative, and a fluorescent label recognition product labeled with the label. .

従来、抗原・抗体の濃度の測定法としては、ラジオアイソトープ、酵素、蛍光体等で抗原・抗体を標識化し、これらの標識が発するシグナルの強度を測定する方法が用いられてきた。しかし、ラジオアイソトープを用いる方法は、特殊な施設や機器が必要であるため、近年ほとんど用いられなくなってきている。また、酵素で標識化する方法は、発光基質を用いた方法が普及しているが、感度が高い反面、基質が高価であり、さらに、酵素と基質を反応させる時間が必要であるため、短時間での測定ができない。   Conventionally, as a method for measuring the concentration of an antigen / antibody, a method of labeling the antigen / antibody with a radioisotope, an enzyme, a fluorescent substance, or the like and measuring the intensity of a signal generated by these labels has been used. However, the method using a radioisotope has hardly been used in recent years because it requires special facilities and equipment. In addition, as a method of labeling with an enzyme, a method using a luminescent substrate is widely used. However, although the sensitivity is high, the substrate is expensive, and further, a time for reacting the enzyme with the substrate is required. Measurement in time is not possible.

一方、蛍光体で標識化する法は、特殊な施設や機器あるいは高価な基質などを必要としないが、感度が低い。そこで、感度を上げるためには多数の蛍光体を抗体等に導入する必要がある。しかし、多数の蛍光体を抗体等に直接結合させると、消光現象が起こって蛍光強度が下がるうえ、蛍光体を導入された抗体等は、疎水性が増して変性してしまう。これに対して、抗体等に親水性重合体のリンカーを導入し、このリンカーに多数の蛍光体を導入することにより、1つの抗体等に多数の蛍光体を導入する方法が提案されている(例えば、特許文献1参照。)。
特開昭58−79162号公報
On the other hand, the method of labeling with a phosphor does not require special facilities or equipment or expensive substrates, but has low sensitivity. Therefore, in order to increase sensitivity, it is necessary to introduce a large number of phosphors into an antibody or the like. However, when a large number of phosphors are directly bonded to an antibody or the like, a quenching phenomenon occurs and the fluorescence intensity decreases, and the antibody or the like into which the phosphor is introduced is denatured due to increased hydrophobicity. On the other hand, a method has been proposed in which a hydrophilic polymer linker is introduced into an antibody or the like, and a large number of phosphors are introduced into the linker to introduce a large number of phosphors into one antibody or the like ( For example, see Patent Document 1.)
JP 58-79162 A

前記方法では、抗体等の変性および蛍光強度の低下を回避できるが、実用性を高めるためには、より蛍光強度の高い蛍光標識体が望まれる。
本発明は、上記課題を解決するためになされたものであり、多数の蛍光体を導入しても、認識物が変性することなく、蛍光体も消光せずに蛍光強度が増幅される蛍光標識体および該標識体で標識化された蛍光標識認識物を提供することを課題とする。
In the above method, denaturation of the antibody or the like and reduction in fluorescence intensity can be avoided, but a fluorescent label with higher fluorescence intensity is desired in order to improve practicality.
The present invention has been made in order to solve the above-mentioned problems, and even when a large number of phosphors are introduced, the recognized substance is not denatured and the fluorescence intensity is amplified without quenching the phosphors. And a fluorescent label recognition product labeled with the label.

本発明者は、前記課題を解決すべく鋭意検討した結果、多数の蛍光体がポリエーテル誘導体を介してアニオン性基を有する親水性重合体に結合された構造の蛍光標識体は、認識物を変性させることなく、蛍光強度を増幅させることを見出すに至った。   As a result of intensive studies to solve the above problems, the present inventor has found that a fluorescent label having a structure in which a large number of phosphors are bonded to a hydrophilic polymer having an anionic group via a polyether derivative is a recognized substance. It has been found that the fluorescence intensity can be amplified without denaturation.

すなわち、かかる課題を解決するため、
請求項1に記載の発明は、アニオン性基を有する親水性重合体に、ポリエーテル誘導体を介して蛍光体が結合された蛍光標識体であって、前記アニオン性基を有する親水性重合体が、アニオン性基としてスルホン酸基またはその塩を有し、3−スルホプロピルメタクリレートおよび2−アクリルアミド−2−メチルプロパンスルホン酸からなる群より任意に選ばれる一種類以上と、2−アミノエチルメタクリレート、N−アクリロキシサクシニミド、N−ビニルジメチルアミンおよびN−ビニルジエチルアミンからなる群より任意に選ばれる一種類以上と、が重合されたものであり、前記ポリエーテル誘導体が、ポリエチレングリコール誘導体またはポリプロピレングリコール誘導体であり、前記蛍光体が、インダセン誘導体、フルオレセイン誘導体、ローダミン誘導体、インドカルボシアニン誘導体、フラザン誘導体、キサンテン色素体、シアニン色素体、クマリン色素体、ポルフィリン色素体または複合色素体であることを特徴とする蛍光標識体である。
In other words, to solve this problem,
The invention according to claim 1 is a fluorescent label in which a phosphor is bound to a hydrophilic polymer having an anionic group via a polyether derivative, wherein the hydrophilic polymer having the anionic group is , Having a sulfonic acid group or a salt thereof as an anionic group, one or more kinds arbitrarily selected from the group consisting of 3-sulfopropyl methacrylate and 2-acrylamido-2-methylpropanesulfonic acid, and 2-aminoethyl methacrylate, N-acryloxysuccinimide, N-vinyldimethylamine, and one or more kinds arbitrarily selected from the group consisting of N-vinyldiethylamine are polymerized, and the polyether derivative is a polyethylene glycol derivative or polypropylene Glycol derivative, the phosphor is an indacene derivative, fluorescein It is a fluorescent label characterized in that it is a zinc derivative, rhodamine derivative, indocarbocyanine derivative, furazane derivative, xanthene dye, cyanine dye, coumarin dye, porphyrin dye or complex dye.

請求項に記載の発明は、前記親水性重合体が、分子量5〜500kDaのものであることを特徴とする請求項に記載の蛍光標識体である。 The invention according to claim 2, wherein the hydrophilic polymer is a fluorescent label according to claim 1, characterized in that the molecular weight 5~500KDa.

請求項に記載の発明は、前記ポリエーテル誘導体が、ポリ(エチレングリコール)ビスアミノプロピルまたはポリ(プロピレングリコール)ビスアミノプロピルであり、分子量0.1〜50kDのものであることを特徴とする請求項1または2に記載の蛍光標識体である。 The invention according to claim 3 is characterized in that the polyether derivative is poly (ethylene glycol) bisaminopropyl or poly (propylene glycol) bisaminopropyl, and has a molecular weight of 0.1 to 50 kD. The fluorescent label according to claim 1 or 2 .

請求項に記載の発明は、前記蛍光体の数が1〜90個であることを特徴とする請求項1〜のいずれか一項に記載の蛍光標識体である。 The invention according to claim 4 is the fluorescent label according to any one of claims 1 to 3 , wherein the number of the phosphors is 1 to 90.

請求項に記載の発明は、請求項1〜のいずれか一項に記載の蛍光標識体と、蛋白質、ペプチド、抗体、抗原、ハプテン、受容体、核酸、ヌクレオチド、ヌクレオチド誘導体、天然もしくは合成薬剤、合成オリゴマー、合成ポリマー、ホルモン、リンフォカイン、サイトカイン、トキシン、リガンド、炭水化物、糖、オリゴ糖または多糖とを結合させて得られた、標識化された蛍光標識認識物である。 The invention according to claim 5 is the fluorescent labeled product according to any one of claims 1 to 4 and a protein, peptide, antibody, antigen, hapten, receptor, nucleic acid, nucleotide, nucleotide derivative, natural or synthetic. A labeled fluorescent label recognition product obtained by binding a drug, a synthetic oligomer, a synthetic polymer, a hormone, a lymphokine, a cytokine, a toxin, a ligand, a carbohydrate, a sugar, an oligosaccharide or a polysaccharide .

請求項に記載の発明は、請求項に記載の蛍光標識認識物を含む免疫測定試薬である。 The invention according to claim 6 is an immunoassay reagent containing the fluorescent label recognition product according to claim 5 .

請求項に記載の発明は、請求項に記載の蛍光標識認識物を用いる免疫測定方法である。 A seventh aspect of the invention is an immunoassay method using the fluorescent label recognition product of the fifth aspect .

請求項1の発明によれば、蛍光体の数から想定される通常の総蛍光量和よりも強い蛍光を検出でき、蛍光標識体を高感度化できる。具体的には、本発明の蛍光標識体の蛍光強度は、蛍光体の数から想定される通常の総蛍光量和よりも、少なくとも10倍以上に増幅される。
また、該蛍光標識体の水溶性が著しく向上し、蛍光標識認識物を変性させることがない。
According to the first aspect of the present invention, it is possible to detect fluorescence that is stronger than the normal total fluorescence amount estimated from the number of phosphors, and to increase the sensitivity of the fluorescent label. Specifically, the fluorescence intensity of the fluorescent label of the present invention is amplified at least 10 times or more than the normal total fluorescence amount assumed from the number of phosphors.
Further, the water-solubility of the fluorescent label is remarkably improved, and the fluorescent label recognition product is not denatured.

請求項2〜9の発明によれば、より水溶性および/または検出感度に優れた蛍光標識体および蛍光標識認識物を得られる。   According to the second to ninth aspects of the present invention, a fluorescent label and a fluorescent label recognition product having better water solubility and / or detection sensitivity can be obtained.

請求項10〜12の発明によれば、蛍光免疫測定等を高感度かつ短時間で実施できる。具体的には、本発明の蛍光標識法では、従来の酵素標識法に対しほぼ同等の感度(2S/N)を有し、最短で1/5程度の時間で測定できる。   According to the inventions of claims 10 to 12, fluorescence immunoassay and the like can be carried out with high sensitivity and in a short time. Specifically, the fluorescence labeling method of the present invention has almost the same sensitivity (2S / N) as that of the conventional enzyme labeling method, and can be measured in a time as short as 1/5.

以下、本発明を詳しく説明する。
図1は、本発明の蛍光標識体の構造を模式的に示すものである。符号1は親水性重合体であり、その構造中には、アニオン性基5が導入されている。また、符号2は、親水性重合体1に導入されたアニオン性基以外の親水性置換基である。また、符号3はポリエーテル誘導体であり、一つの親水性重合体1に複数が共有結合を介して分鎖状に結合しており、その一部のポリエーテル誘導体3の末端には、蛍光体4が共有結合を介して結合されている。認識物は、親水性重合体中の官能基に、共有結合を介して、直接結合されている。(図示略)
The present invention will be described in detail below.
FIG. 1 schematically shows the structure of the fluorescent label of the present invention. Reference numeral 1 denotes a hydrophilic polymer, and an anionic group 5 is introduced into the structure. Reference numeral 2 denotes a hydrophilic substituent other than the anionic group introduced into the hydrophilic polymer 1. Reference numeral 3 denotes a polyether derivative, a plurality of which are bonded to one hydrophilic polymer 1 through a covalent bond in a branched form, and a phosphor is attached to the end of a part of the polyether derivative 3 4 are linked via a covalent bond. The recognition product is directly bonded to the functional group in the hydrophilic polymer through a covalent bond. (Not shown)

(親水性重合体)
本発明の蛍光標識体を構成する親水性重合体は、その構造中にアニオン性基などの親水性置換基を有するものであり、好ましくはアクリル酸誘導体またはビニル誘導体等のモノマーを重合したものが用いられる。アクリル酸誘導体としては、例えば、アクリル酸、メタクリル酸、2−アミノエチルメタクリレート、3−スルホプロピルメタクリレート、2−アクリルアミド−2−メチルプロパンスルホン酸、2−エチルメタクリル酸グルコシド、N−アクリロキシサクシニミド等が挙げられ、ビニル誘導体としては、例えば、ビニルスルホン酸ナトリウム、N−ビニルジメチルアミン、N−ビニルジエチルアミン、ビニルホスホン酸ジメチル、ビニルホスホン酸ジエチル等が挙げられるが、用いることのできるモノマーは、これらの化合物に限定されない。中でも、アミノ基を有するアクリル酸誘導体またはビニル誘導体と、スルホン酸基またはリン酸基を有するアクリル酸誘導体またはビニル誘導体とからなる親水性重合体が好ましい。またモノマーは、単独で用いても良いし、二種以上を併用しても良い。
(Hydrophilic polymer)
The hydrophilic polymer constituting the fluorescent label of the present invention has a hydrophilic substituent such as an anionic group in its structure, and preferably a polymer obtained by polymerizing a monomer such as an acrylic acid derivative or a vinyl derivative. Used. Examples of acrylic acid derivatives include acrylic acid, methacrylic acid, 2-aminoethyl methacrylate, 3-sulfopropyl methacrylate, 2-acrylamido-2-methylpropane sulfonic acid, 2-ethyl methacrylic acid glucoside, and N-acryloxy succini. Examples of vinyl derivatives include sodium vinyl sulfonate, N-vinyldimethylamine, N-vinyldiethylamine, dimethyl vinylphosphonate, diethyl vinylphosphonate, and the like. However, it is not limited to these compounds. Among these, a hydrophilic polymer comprising an acrylic acid derivative or vinyl derivative having an amino group and an acrylic acid derivative or vinyl derivative having a sulfonic acid group or a phosphoric acid group is preferable. Moreover, a monomer may be used independently and may use 2 or more types together.

親水性置換基としては、アニオン性基の他、水酸基、チオール基、アミノ基、四級アンモニウム基等を挙げることができる。
また、前記親水性重合体は、分子量が好ましくは5〜500kDa、より好ましくは5〜100kDaのものが用いられる。
Examples of the hydrophilic substituent include an anionic group, a hydroxyl group, a thiol group, an amino group, and a quaternary ammonium group.
The hydrophilic polymer has a molecular weight of preferably 5 to 500 kDa, more preferably 5 to 100 kDa.

アニオン性基を有する親水性重合体の調製方法としては、アニオン性基を有するモノマーを重合する方法と、アニオン性基を持たないモノマーを重合して得られる重合体に、アニオン性基を導入する方法のいずれも適用できる。
ここで、アニオン性基としては、好ましくは、スルホン酸基、リン酸基、またはそれらの塩を用いるが、これら以外にも、例えば、ホスフィン酸基(−phosphinic acid)、スルフィン酸基(−sulfinic acid)、スルフェン酸基(−sulfenic acid)、カルボン酸基、またはそれらの塩等を用いることができる。
As a method for preparing a hydrophilic polymer having an anionic group, a method for polymerizing a monomer having an anionic group and a method for introducing an anionic group into a polymer obtained by polymerizing a monomer having no anionic group. Any of the methods can be applied.
Here, as the anionic group, a sulfonic acid group, a phosphoric acid group, or a salt thereof is preferably used, but other than these, for example, a phosphinic acid group (-phosphinic acid group), a sulfinic acid group (-sulfinic acid group). acid), a sulfenic acid group (-sulfuric acid group), a carboxylic acid group, or a salt thereof can be used.

(ポリエーテル誘導体)
本発明の蛍光標識体を構成するポリエーテル誘導体としては、例えば、ポリエチレングリコール誘導体、ポリプロピレングリコール誘導体等を挙げることができる。
これらのポリエーテル誘導体は、例えば、ポリ(エチレングリコール)ビスアミノプロピル、ポリ(プロピレングリコール)ビスアミノプロピルのように、両端にアミノ基等の官能基を有する誘導体を、一端の官能基は親水性重合体と、他方の官能基は蛍光体と反応させることにより、導入されている。
ポリエーテル誘導体は、分子量が好ましくは0.1〜50kDa、より好ましくは10〜30kDaのものが用いられる。
(Polyether derivative)
Examples of the polyether derivative constituting the fluorescent label of the present invention include a polyethylene glycol derivative and a polypropylene glycol derivative.
These polyether derivatives are derivatives having functional groups such as amino groups at both ends, such as poly (ethylene glycol) bisaminopropyl and poly (propylene glycol) bisaminopropyl, and the functional group at one end is hydrophilic. The polymer and the other functional group are introduced by reacting with the phosphor.
As the polyether derivative, one having a molecular weight of preferably 0.1 to 50 kDa, more preferably 10 to 30 kDa is used.

(蛍光体)
本発明の蛍光標識体を構成する蛍光体としては、例えば、インダセン誘導体、フルオレセイン誘導体、ローダミン誘導体、インドカルボシアニン誘導体およびフラザン誘導体等を挙げることができる。
また、キサンテン色素体、シアニン色素体、クマリン色素体、ポルフィリン色素体、または複合色素体等の蛍光色素を用いることも出来るが、本発明で蛍光体として用いることのできるものは、これらに限定されるものではない。天然に存在する物質(天然由来物質)は、約200nm〜500nmの比較的短い波長で励起され発光する。従って、蛍光測定時に天然由来物質からの蛍光と誤認しないために、約500nmを越える波長、好ましくは約500nm〜900nmのスペクトル範囲の光によって励起される前記蛍光体が用いられる。
(Phosphor)
Examples of the phosphor constituting the fluorescent label of the present invention include indacene derivatives, fluorescein derivatives, rhodamine derivatives, indocarbocyanine derivatives and furazane derivatives.
In addition, fluorescent dyes such as xanthene chromophore, cyanine chromophore, coumarin chromophore, porphyrin chromophore, or complex chromophore can be used, but those that can be used as the phosphor in the present invention are limited to these. It is not something. A naturally occurring substance (naturally-derived substance) is excited and emits light at a relatively short wavelength of about 200 nm to 500 nm. Therefore, in order not to misidentify as fluorescence from a naturally-derived substance at the time of fluorescence measurement, the phosphor that is excited by light having a wavelength exceeding about 500 nm, preferably about 500 nm to 900 nm is used.

(蛍光標識体)
本発明の蛍光標識体は、一つの親水性重合体に、複数のポリエーテル誘導体が共有結合により分鎖状に結合しており、その一部のポリエーテル誘導体の末端には、蛍光体が共有結合を介して結合した構造からなる。蛍光体が直接親水性重合体に結合していないため、各蛍光体同士は凝集しにくく、かつ、蛍光標識体は十分な親水性を維持できるため、認識物と結合しても変性しない。
(Fluorescent label)
In the fluorescent label of the present invention, a plurality of polyether derivatives are covalently bonded to one hydrophilic polymer, and the phosphor is shared at the end of some of the polyether derivatives. It consists of a structure connected through a bond. Since the phosphor is not directly bonded to the hydrophilic polymer, the phosphors are not easily aggregated, and the fluorescent label can maintain sufficient hydrophilicity, so that it does not denature even if it binds to a recognized substance.

蛍光強度の増幅効果は、親水性重合体1個に対して導入された蛍光体の数が1個である蛍光標識体でも観察される。各測定系において高感度測定を行うためには、親水性重合体1個に対して、蛍光体を好ましくは1〜90個、より好ましくは3〜60個導入する。90個以上の蛍光体を導入することも可能だが、蛍光強度の増幅効果は徐々に低下する。   The amplification effect of the fluorescence intensity is also observed with a fluorescent label having one fluorescent substance introduced per hydrophilic polymer. In order to perform high-sensitivity measurement in each measurement system, preferably 1 to 90 phosphors, more preferably 3 to 60 phosphors are introduced to one hydrophilic polymer. Although it is possible to introduce more than 90 phosphors, the amplification effect of the fluorescence intensity gradually decreases.

(蛍光標識認識物)
前記蛍光標識体は、各種認識物を蛍光標識できる。ここで、認識物としては、蛋白質、ペプチド、抗体、抗原、ハプテン、受容体、核酸、ヌクレオチド、ヌクレオチド誘導体、天然または合成薬剤、合成オリゴマー、合成ポリマー、ホルモン、リンフォカイン、サイトカイン、トキシン、リガンド、炭水化物、糖、オリゴ糖、多糖等を挙げることができる。
(Fluorescent label recognition product)
The fluorescent label can fluorescently label various recognition objects. Here, the recognized substances include proteins, peptides, antibodies, antigens, haptens, receptors, nucleic acids, nucleotides, nucleotide derivatives, natural or synthetic drugs, synthetic oligomers, synthetic polymers, hormones, lymphokines, cytokines, toxins, ligands, carbohydrates , Sugars, oligosaccharides, polysaccharides and the like.

蛍光標識体と前記認識物との結合は、親水性重合体に存在するカルボキシル基、アミノ基等の官能基と、認識物に存在する官能基とを反応させて形成する。例えば、一方の官能基がカルボン酸の場合には、カップリング試薬を用いて反応させる方法のほか、カルボン酸ハロゲン化物、カルボン酸無水物、カルボン酸ヒドラジド、カルボン酸アジド、活性化エステル等に活性化した後、他方のアミノ基と反応させることができる。また、一方の官能基がアミノ基の場合には、イミノチオランによってチオール化した後、GMBS(N−(4−Maleimidobutyryloxy)succinimide)を用いて他方のアミノ基と結合させる方法がある。
蛍光標識認識物の調製にあたっては、前記蛍光標識体1個あたり、1〜4個の認識物を導入することが好ましい。
The bond between the fluorescent label and the recognized product is formed by reacting a functional group such as a carboxyl group or amino group present in the hydrophilic polymer with a functional group present in the recognized product. For example, when one functional group is a carboxylic acid, in addition to a method of reacting with a coupling reagent, it is active on carboxylic acid halides, carboxylic acid anhydrides, carboxylic acid hydrazides, carboxylic acid azides, activated esters, etc. Can be reacted with the other amino group. Moreover, when one functional group is an amino group, after thiolation with iminothiolane, there is a method of binding to the other amino group using GMBS (N- (4-Maleimidebutyroxy) succinimide).
In preparing a fluorescent label recognition product, it is preferable to introduce 1 to 4 recognition products for each fluorescent label.

(蛍光標識認識物を含む免疫測定試薬及び該試薬を用いた免疫測定方法)
本発明の蛍光標識認識物は、従来の免疫測定法に用いられる、抗体等を結合させた各種免疫測定用の固相試薬とともに、免疫測定に用いることができる。これらの試薬は、周知の1ステップ法、ディレイ1ステップ法、2ステップ法等のサンドイッチ法、競合法等に用いられ、免疫反応により、固相上の抗体等との間に免疫複合体を形成した蛍光標識認識物の蛍光強度を測定することで、免疫測定を実施できる。測定できる物質は、前記蛍光標識認識物と反応あるいは相互作用する物質であり、例えば、生体由来の各種抗原、抗体等を挙げることができる。これら抗原、抗体等を含む検体としては、例えば全血、血清、血漿、尿、リンパ液等の体液、便抽出液等を挙げることができる。
(Immunoassay reagent containing fluorescent label recognition product and immunoassay method using the reagent)
The fluorescent label-recognized product of the present invention can be used for immunoassay together with various solid phase reagents for immunoassay combined with antibodies and the like used in conventional immunoassay methods. These reagents are used in the well-known one-step method, the delay one-step method, the two-step method, etc., the sandwich method, the competition method, etc., and form an immune complex with the antibody on the solid phase by the immune reaction. An immunoassay can be carried out by measuring the fluorescence intensity of the recognized fluorescent label. The substance that can be measured is a substance that reacts or interacts with the fluorescent label recognition product, and examples thereof include various antigens and antibodies derived from living organisms. Examples of specimens containing these antigens, antibodies and the like include body fluids such as whole blood, serum, plasma, urine and lymph, stool extract and the like.

以下、本発明を実施例等に基づき、さらに詳しく説明する。もっとも、本発明は下記実施例に限定されるものではない。   Hereinafter, the present invention will be described in more detail based on examples and the like. However, the present invention is not limited to the following examples.

[製造例1]
(3−スルホプロピルメタクリレートと2−アミノエチルメタクリレート塩酸とからなる親水性重合体の調製)
3−スルホプロピルメタクリレート1.97g、2−アミノエチルメタクリレート塩酸0.33gを100mlのナスフラスコに入れ、これに無水ジメチルホルムアミド25mlを加えて溶解した。次に、反応開始剤としてAIBN163mgを加えて脱気し、アルゴンガスに置換した。65℃に加温したオイルバスにナスフラスコを浸し、3時間反応させた。反応終了後、ナスフラスコに乾燥アセトン150mlを加え、生じた沈殿物をガラスフィルターで濾取した。得られた沈殿物を30〜40℃に加温しながら真空乾燥させ、3−スルホプロピルメタクリレートと2−アミノエチルメタクリレート塩酸とからなる親水性重合体を2.1g得た。
[Production Example 1]
(Preparation of hydrophilic polymer comprising 3-sulfopropyl methacrylate and 2-aminoethyl methacrylate hydrochloric acid)
1.97 g of 3-sulfopropyl methacrylate and 0.33 g of 2-aminoethyl methacrylate hydrochloric acid were placed in a 100 ml eggplant flask, and 25 ml of anhydrous dimethylformamide was added and dissolved therein. Next, 163 mg of AIBN was added as a reaction initiator for deaeration and replaced with argon gas. The eggplant flask was immersed in an oil bath heated to 65 ° C. and allowed to react for 3 hours. After completion of the reaction, 150 ml of dry acetone was added to the eggplant flask, and the resulting precipitate was collected by filtration with a glass filter. The obtained precipitate was vacuum-dried while being heated to 30 to 40 ° C. to obtain 2.1 g of a hydrophilic polymer composed of 3-sulfopropyl methacrylate and 2-aminoethyl methacrylate hydrochloric acid.

[実施例1]
(親水性重合体の調製)
2−アクリルアミド−2−メチルプロパンスルホン酸0.58g、N−アクリロキシサクシニミド1.13gを200mlのナスフラスコに入れ、これに無水ジメチルホルムアミド50mlを加えて溶解した。次に、反応開始剤としてAIBN163mgを加えて脱気し、アルゴンガスに置換した。65℃に加温したオイルバスにナスフラスコを浸し、3時間反応させた。反応終了後、ナスフラスコに乾燥酢酸エチル150mlを加え、生じた沈殿物をガラスフィルターで濾取した。得られた沈殿物を30〜40℃に加温しながら真空乾燥させ、2−アクリルアミド−2−メチルプロパンスルホン酸とN−アクリロキシサクシニミドとからなる親水性重合体を1.3g得た。
[Example 1]
(Preparation of hydrophilic polymer)
0.58 g of 2-acrylamido-2-methylpropanesulfonic acid and 1.13 g of N-acryloxysuccinimide were placed in a 200 ml eggplant flask, and 50 ml of anhydrous dimethylformamide was added and dissolved therein. Next, 163 mg of AIBN was added as a reaction initiator for deaeration and replaced with argon gas. The eggplant flask was immersed in an oil bath heated to 65 ° C. and allowed to react for 3 hours. After completion of the reaction, 150 ml of dry ethyl acetate was added to the eggplant flask, and the resulting precipitate was collected by filtration with a glass filter. The obtained precipitate was vacuum-dried while being heated to 30 to 40 ° C. to obtain 1.3 g of a hydrophilic polymer composed of 2-acrylamido-2-methylpropanesulfonic acid and N-acryloxysuccinimide. .

(親水性重合体へのポリエチレングリコール誘導体の導入)
ポリエチレングリコール−ビス−3−アミノプロパン(アルドリッチ社製)約4.8g(親水性重合体の約200倍量)の50ml水溶液を調製し、塩酸を用いてpH7〜8に合わせた。この溶液に、上記の2−アクリルアミド−2−メチルプロパンスルホン酸とN−アクリロキシサクシニミドとからなる親水性重合体500mg(平均分子量30,000)のジメチルスルホキシド溶液を、撹拌しながら少量ずつ加えた。室温で3時間反応後、スーパーデックス−200(ファルマシア社製;35×600mm、50mM CHES−NaOH pH10緩衝液で平衡化)でゲル濾過し、未反応のポリエチレングリコール−ビス−3−アミノプロパンを取り除いた。目的物を含むフラクションを集め、透析膜を用いて一昼夜透析後、凍結乾燥し、ポリエチレングリコール−ビス−3−アミノプロパンが導入された2−アクリルアミド−2−メチルプロパンスルホン酸とN−アクリロキシサクシニミドとからなる親水性重合体を約720mg得た。
(Introduction of polyethylene glycol derivatives into hydrophilic polymers)
A 50 ml aqueous solution of about 4.8 g of polyethylene glycol-bis-3-aminopropane (manufactured by Aldrich) (about 200 times the amount of hydrophilic polymer) was prepared, and adjusted to pH 7-8 using hydrochloric acid. To this solution, a dimethyl sulfoxide solution of 500 mg (average molecular weight 30,000) of a hydrophilic polymer composed of 2-acrylamido-2-methylpropanesulfonic acid and N-acryloxysuccinimide as described above is added little by little with stirring. added. After reaction at room temperature for 3 hours, gel filtration was performed with Superdex-200 (Pharmacia, 35 × 600 mm, equilibrated with 50 mM CHES-NaOH pH 10 buffer) to remove unreacted polyethylene glycol-bis-3-aminopropane. It was. Fractions containing the desired product were collected, dialyzed overnight using a dialysis membrane, freeze-dried, and 2-acrylamido-2-methylpropanesulfonic acid and N-acryloxysac introduced with polyethylene glycol-bis-3-aminopropane. About 720 mg of a hydrophilic polymer composed of sinimide was obtained.

(蛍光標識体の調製)
次いで、上記のポリエチレングリコール−ビス−3−アミノプロパンが導入された親水性重合体5mgを秤量し、50mMリン酸緩衝液1mlに溶解した。次に、この溶液を攪拌しながら、蛍光体4,4−ジフルオロ−5−(2−チエニル)−4−ボラ−3a,4a−ジアザ−s−インダセン−3−プロピオン酸スクシミニジルエステル(モレキュラープローブス社製、以下、BODIPY−560と略記)2.7mg/200μl乾燥ジメチルスルホキシド溶液を30分かけて少量ずつ添加し、添加終了後約2時間攪拌した。攪拌終了後、純水で平衡化したPD−10カラム(ファルマシア社製)を用いて、未反応のBODIPY−560とジメチルスルホキシドを取り除いた。目的物を含むフラクションを集め、分画分子量1万の限外ろ過器(ミリポア社製;セントリプレップ−10)で1ml程度まで濃縮した。濃縮物を凍結乾燥し、目的物であるBODIPY−560で標識化された蛍光標識体を3.7mg得た。
(Preparation of fluorescent label)
Subsequently, 5 mg of the hydrophilic polymer introduced with the above polyethylene glycol-bis-3-aminopropane was weighed and dissolved in 1 ml of 50 mM phosphate buffer. Next, while stirring this solution, phosphor 4,4-difluoro-5- (2-thienyl) -4-bora-3a, 4a-diaza-s-indacene-3-propionic acid succiminidyl ester ( A 2.7 mg / 200 μl dry dimethyl sulfoxide solution was added in small portions over 30 minutes, and the mixture was stirred for about 2 hours after completion of the addition (manufactured by Molecular Probes, hereinafter abbreviated as BODIPY-560). After stirring, unreacted BODIPY-560 and dimethyl sulfoxide were removed using a PD-10 column (Pharmacia) equilibrated with pure water. Fractions containing the desired product were collected and concentrated to about 1 ml with an ultrafilter having a molecular weight cut-off of 10,000 (Millipore Corp .; Centriprep-10). The concentrate was freeze-dried to obtain 3.7 mg of a fluorescent label labeled with the target product BODIPY-560.

[実施例2]
(親水性重合体の調製)
3−スルホプロピルメタクリレート1.23g、N−アクリロキシサクシニミド0.98gを200mlのナスフラスコに入れ、これに無水ジメチルホルムアミド25mlを加えて溶解した。次に、反応開始剤としてAIBN163mgを加えて脱気し、アルゴンガスに置換した。65℃に加温したオイルバスにナスフラスコを浸し、1時間反応させた。反応終了後、ナスフラスコに乾燥酢酸エチル150mlを加え、生じた沈殿物をガラスフィルターで濾取した。得られた沈殿物を30〜40℃に加温しながら真空乾燥させ、3−スルホプロピルメタクリレートとN−アクリロキシサクシニミドとからなる親水性重合体を1.6g得た。
[Example 2]
(Preparation of hydrophilic polymer)
1.23 g of 3-sulfopropyl methacrylate and 0.98 g of N-acryloxysuccinimide were placed in a 200 ml eggplant flask, to which 25 ml of anhydrous dimethylformamide was added and dissolved. Next, 163 mg of AIBN was added as a reaction initiator for deaeration and replaced with argon gas. The eggplant flask was immersed in an oil bath heated to 65 ° C. and allowed to react for 1 hour. After completion of the reaction, 150 ml of dry ethyl acetate was added to the eggplant flask, and the resulting precipitate was collected by filtration with a glass filter. The obtained precipitate was vacuum-dried while being heated to 30 to 40 ° C. to obtain 1.6 g of a hydrophilic polymer composed of 3-sulfopropyl methacrylate and N-acryloxysuccinimide.

(親水性重合体へのポリエチレングリコール誘導体の導入)
ポリエチレングリコール−ビス−3−アミノプロパン(アルドリッチ社製)約1.4g(親水性重合体の約200倍量)の50ml水溶液を調製し、塩酸を用いてpH7〜8に合わせた。この溶液に、上記の3−スルホプロピルメタクリレートとN−アクリロキシサクシニミドとからなる親水性重合体100mg(平均分子量45,000)のジメチルスルホキシド溶液を、撹拌しながら少量ずつ加えた。室温で3時間反応後、スーパーデックス−200(ファルマシア社製;35×600mm、50mM CHES−NaOH pH10緩衝液で平衡化)でゲル濾過し、未反応のポリエチレングリコール−ビス−3−アミノプロパンを取り除いた。目的物を含むフラクションを集め、透析膜を用いて一昼夜透析後、凍結乾燥し、ポリエチレングリコール−ビス−3−アミノプロパンが導入された3−スルホプロピルメタクリレートとN−アクリロキシサクシニミドとからなる親水性重合体を約150mg得た。
(Introduction of polyethylene glycol derivatives into hydrophilic polymers)
A 50 ml aqueous solution of about 1.4 g of polyethylene glycol-bis-3-aminopropane (manufactured by Aldrich) (about 200 times the amount of hydrophilic polymer) was prepared, and adjusted to pH 7-8 using hydrochloric acid. To this solution, a dimethyl sulfoxide solution of 100 mg (average molecular weight 45,000) of a hydrophilic polymer composed of the above-mentioned 3-sulfopropyl methacrylate and N-acryloxysuccinimide was added little by little with stirring. After reaction at room temperature for 3 hours, gel filtration was performed with Superdex-200 (Pharmacia, 35 × 600 mm, equilibrated with 50 mM CHES-NaOH pH 10 buffer) to remove unreacted polyethylene glycol-bis-3-aminopropane. It was. Fractions containing the desired product are collected, dialyzed overnight using a dialysis membrane, freeze-dried, and composed of 3-sulfopropyl methacrylate introduced with polyethylene glycol-bis-3-aminopropane and N-acryloxysuccinimide About 150 mg of hydrophilic polymer was obtained.

(蛍光標識体の調製)
次いで、上記のポリエチレングリコール−ビス−3−アミノプロパンが導入された親水性重合体5mgを秤量し、1mlの50mMリン酸緩衝液(pH7.0)で溶解した。次に、この溶液を攪拌しながら、蛍光体N−エチル−N−{5−(N″−サクシニミジロキシカルボニル)ペンチル}インドカルボシアニン塩酸塩(同仁化学社製、以下、IC3と略記)0.32mg/200μl乾燥ジメチルスルホキシド溶液を30分かけて少量ずつ添加し、添加終了後約2時間攪拌した。攪拌終了後、純水で平衡化したPD−10カラム(ファルマシア社製)を用いて、未反応のIC3とジメチルスルホキシドを取り除いた。目的物を含むフラクションを集め、分画分子量1万の限外ろ過器(ミリポア社製;セントリプレップ−10)で1ml程度まで濃縮した。濃縮物を凍結乾燥し、目的物であるIC3で標識化された蛍光標識体を3.8mg得た。
(Preparation of fluorescent label)
Subsequently, 5 mg of the hydrophilic polymer introduced with the above polyethylene glycol-bis-3-aminopropane was weighed and dissolved in 1 ml of 50 mM phosphate buffer (pH 7.0). Next, while stirring this solution, phosphor N-ethyl-N- {5- (N ″ -succinimidyloxycarbonyl) pentyl} indocarbocyanine hydrochloride (manufactured by Dojin Chemical Co., Ltd., hereinafter abbreviated as IC3) A 0.32 mg / 200 μl dry dimethyl sulfoxide solution was added in small portions over 30 minutes, and the mixture was stirred for about 2 hours after the addition was completed, using a PD-10 column (Pharmacia) equilibrated with pure water. Unreacted IC3 and dimethyl sulfoxide were removed, and fractions containing the target product were collected and concentrated to about 1 ml with an ultrafilter having a molecular weight cut off of 10,000 (Millipore Corp .; Centriprep-10). By freeze-drying, 3.8 mg of a fluorescent label labeled with the target product, IC3, was obtained.

[実施例3]
(蛍光標識体の調製)
実施例2で用いた、上記のポリエチレングリコール−ビス−3−アミノプロパンが導入された3−スルホプロピルメタクリレートとN−アクリロキシサクシニミドとからなる親水性重合体5mgを秤量し、50mMリン酸緩衝液1mlに溶解した。次に、この溶液を攪拌しながら、BODIPY−560(モレキュラープローブス社)2.7mg/200μl乾燥ジメチルスルホキシド溶液を、30分かけて少量ずつ添加し、添加終了後約2時間攪拌した。攪拌終了後、純水で平衡化したPD−10カラム(ファルマシア社製)を用いて、未反応のBODIPY−560とジメチルスルホキシドを取り除いた。目的物を含むフラクションを集め、分画分子量1万の限外ろ過器(ミリポア社製;セントリプレップ−10)で1ml程度まで濃縮した。濃縮物を凍結乾燥し、目的物であるBODIPY−560で標識化された蛍光標識体を4.5mg得た。
[Example 3]
(Preparation of fluorescent label)
Weighed 5 mg of the hydrophilic polymer composed of 3-sulfopropyl methacrylate introduced with polyethylene glycol-bis-3-aminopropane and N-acryloxysuccinimide used in Example 2, and 50 mM phosphoric acid. Dissolved in 1 ml of buffer. Next, while stirring this solution, a BODIPY-560 (Molecular Probes) 2.7 mg / 200 μl dry dimethyl sulfoxide solution was added in small portions over 30 minutes, and the mixture was stirred for about 2 hours after completion of the addition. After stirring, unreacted BODIPY-560 and dimethyl sulfoxide were removed using a PD-10 column (Pharmacia) equilibrated with pure water. Fractions containing the desired product were collected and concentrated to about 1 ml with an ultrafilter having a molecular weight cut-off of 10,000 (Millipore Corp .; Centriprep-10). The concentrate was lyophilized to obtain 4.5 mg of a fluorescent label labeled with BODIPY-560 which is the target product.

[実施例4]
(蛍光標識認識物の調製)
αフェトプロテイン抗体2ml(2mg/ml、pH7 リン酸緩衝液溶液)をPD−10カラム(ファルマシア社製)で100mM炭酸緩衝液pH8.5に置換した。緩衝液を置換後、イミノチオラン117μl(1mg/ml)加え、37℃で1時間撹拌しながら反応させた。反応終了後、限外ろ過器(ザルトリウス社製;分子量30,000カット)で2ml以下まで濃縮した。濃縮後、PD−10カラム(pH6.3、50mMリン酸緩衝液で平衡化)で緩衝液を置換し、イミノチオラン化αフェトプロテイン抗体を得た。
次に、実施例1で調製した蛍光標識体0.9mg(0.06μmol)秤量し、pH7のリン酸緩衝液に溶解した。この中に、GMBS(同仁化学社製)6.2mg/mlジメチルホルムアミド溶液185μlを加えた。暗所で1時間反応後、PD−10カラム(pH6.3、50mMリン酸緩衝液で平衡化)で未反応のGMBSとジメチルホルムアミドを取り除き、GMB化蛍光標識体分画を得た。
上記イミノチオラン化αフェトプロテイン抗体とGMB化蛍光標識体を混和し、暗所で一昼夜反応させた。反応終了後、スーパーデックス200(ファルマシア社製)を用いて、BODIPY−560で蛍光標識化された抗体、すなわち蛍光標識認識物を得た。
[Example 4]
(Preparation of fluorescent label recognition product)
2 ml of α-fetoprotein antibody (2 mg / ml, pH 7 phosphate buffer solution) was replaced with 100 mM carbonate buffer pH 8.5 with a PD-10 column (Pharmacia). After replacing the buffer solution, 117 μl (1 mg / ml) of iminothiolane was added, and the mixture was allowed to react with stirring at 37 ° C. for 1 hour. After completion of the reaction, the reaction mixture was concentrated to 2 ml or less with an ultrafilter (manufactured by Sartorius; molecular weight 30,000 cut). After concentration, the buffer solution was replaced with a PD-10 column (pH 6.3, equilibrated with 50 mM phosphate buffer) to obtain an iminothiolanated α-fetoprotein antibody.
Next, 0.9 mg (0.06 μmol) of the fluorescent label prepared in Example 1 was weighed and dissolved in a pH 7 phosphate buffer solution. Into this, 185 μl of GMBS (manufactured by Dojin Chemical) 6.2 mg / ml dimethylformamide solution was added. After reacting in the dark for 1 hour, unreacted GMBS and dimethylformamide were removed with a PD-10 column (pH 6.3, equilibrated with 50 mM phosphate buffer) to obtain a GMB-labeled fluorescent labeled fraction.
The iminothiolanated α-fetoprotein antibody and a GMB-labeled fluorescent label were mixed and reacted overnight in the dark. After completion of the reaction, an antibody fluorescently labeled with BODIPY-560, that is, a fluorescent label recognition product, was obtained using Superdex 200 (manufactured by Pharmacia).

(蛍光標識体の蛍光強度の測定)
[試験例1]
(BODIPY−560で標識化された蛍光標識体の蛍光強度の測定)
実施例1で調製した蛍光標識体1mgを秤量し、50mMリン酸緩衝液(pH7.0)1mlに溶解し、1mg/ml溶液とした。この溶液をさらに1/100希釈し、10μg/mlとした。この溶液を上記緩衝液で3希釈し、1/2187の濃度のものまでサンプルを調製した。これら希釈サンプルの蛍光強度を、蛍光光度計で励起波長563nm、蛍光波長573nmで測定した。結果を図2に示す。図2のグラフの縦軸は蛍光強度(563/573nmと略記)を示し、横軸はBODIPY−560の濃度を示す。
(Measurement of fluorescence intensity of fluorescent label)
[Test Example 1]
(Measurement of fluorescence intensity of fluorescent label labeled with BODIPY-560)
1 mg of the fluorescent label prepared in Example 1 was weighed and dissolved in 1 ml of 50 mM phosphate buffer (pH 7.0) to obtain a 1 mg / ml solution. This solution was further diluted 1/100 to 10 μg / ml. This solution was diluted 3 n with the above buffer to prepare a sample having a concentration of 1/2187. The fluorescence intensity of these diluted samples was measured with a fluorometer at an excitation wavelength of 563 nm and a fluorescence wavelength of 573 nm. The results are shown in FIG. The vertical axis of the graph in FIG. 2 indicates fluorescence intensity (abbreviated as 563/573 nm), and the horizontal axis indicates the concentration of BODIPY-560.

[試験例2]
(IC3で標識化された蛍光標識体の蛍光強度の測定)
実施例2で調製した蛍光標識体1mgを秤量し、50mMリン酸緩衝液(pH7.0)1mlに溶解し、1mg/ml溶液とした。この溶液をさらに1/100希釈し、10μg/mlとした。この溶液を上記緩衝液で3希釈し、1/2187の濃度のものまでサンプルを調製した。これら希釈サンプルの蛍光強度を、蛍光光度計で励起波長552nm、蛍光波長566nmで測定した。結果を図3に示す。図3のグラフの縦軸は蛍光強度(552/566nmと略記)を示し、横軸はIC3の濃度を示す。
[Test Example 2]
(Measurement of fluorescence intensity of fluorescent label labeled with IC3)
1 mg of the fluorescent label prepared in Example 2 was weighed and dissolved in 1 ml of 50 mM phosphate buffer (pH 7.0) to obtain a 1 mg / ml solution. This solution was further diluted 1/100 to 10 μg / ml. This solution was diluted 3 n with the above buffer to prepare a sample having a concentration of 1/2187. The fluorescence intensity of these diluted samples was measured with a fluorometer at an excitation wavelength of 552 nm and a fluorescence wavelength of 566 nm. The results are shown in FIG. The vertical axis of the graph of FIG. 3 indicates the fluorescence intensity (abbreviated as 552/566 nm), and the horizontal axis indicates the concentration of IC3.

[参考例1]
(BODIPY−560単独での蛍光強度の測定)
BODIPY−560を少量のジメチルスルホキシドで溶解し、50mMリン酸緩衝液(pH7.0)で希釈した。さらに、この緩衝液で4希釈を行い、終濃度として225nM〜0.3nMの濃度のサンプルを調製した。調製したBODIPY−560溶液を、励起波長563nm、蛍光波長573nmで蛍光強度を測定した。結果を図4に示す。図4のグラフの縦軸は蛍光強度(563/573nmと略記)を示し、横軸はBODIPY−560の濃度を示す。
[Reference Example 1]
(Measurement of fluorescence intensity with BODIPY-560 alone)
BODIPY-560 was dissolved in a small amount of dimethyl sulfoxide and diluted with 50 mM phosphate buffer (pH 7.0). Furthermore, 4 n dilution was performed with this buffer solution, and a sample having a concentration of 225 nM to 0.3 nM was prepared as a final concentration. The fluorescence intensity of the prepared BODIPY-560 solution was measured at an excitation wavelength of 563 nm and a fluorescence wavelength of 573 nm. The results are shown in FIG. The vertical axis of the graph in FIG. 4 indicates fluorescence intensity (abbreviated as 563/573 nm), and the horizontal axis indicates the concentration of BODIPY-560.

[参考例2]
(IC3単独での蛍光強度の測定)
IC3のジメチルホルムアミド溶液を調製し、更に50mMリン酸緩衝液(pH7.0)で3希釈を行い、終濃度として277nM〜0.126nMの濃度のサンプルを調製した。調製したIC3溶液を、励起波長552nm、蛍光波長566nmで蛍光強度を測定した。結果を図5に示す。図5のグラフの縦軸は蛍光強度(552/566nmと略記)を示し、横軸はIC3の濃度を示す。
[Reference Example 2]
(Measurement of fluorescence intensity with IC3 alone)
A dimethylformamide solution of IC3 was prepared, and further diluted 3 n with 50 mM phosphate buffer (pH 7.0) to prepare a sample having a final concentration of 277 nM to 0.126 nM. The fluorescence intensity of the prepared IC3 solution was measured at an excitation wavelength of 552 nm and a fluorescence wavelength of 566 nm. The results are shown in FIG. The vertical axis of the graph in FIG. 5 indicates the fluorescence intensity (abbreviated as 552/566 nm), and the horizontal axis indicates the concentration of IC3.

図2および4のグラフを比較すると、例えば、BODIPY−560単独で6nMの濃度で得られる蛍光強度は、蛍光標識体中のBODIPY−560では、0.1nMの濃度で得られることから、本発明の蛍光標識体中のBODIPY−560は、蛍光強度が60倍程度増幅されていることが確認された。   Comparing the graphs of FIGS. 2 and 4, for example, the fluorescence intensity obtained at a concentration of 6 nM with BODIPY-560 alone is obtained at a concentration of 0.1 nM with BODIPY-560 in the fluorescent label. It was confirmed that the fluorescence intensity of BODIPY-560 in this fluorescent label was amplified about 60 times.

図3および5のグラフを比較すると、例えば、IC3単独で10nMの濃度で得られる蛍光強度は、蛍光標識体中のIC3では、0.8nMの濃度で得られることから、本発明の蛍光標識体中のIC3は、蛍光強度が13倍程度増幅されていることが確認された。   Comparing the graphs of FIGS. 3 and 5, for example, the fluorescence intensity obtained at a concentration of 10 nM with IC3 alone is obtained at a concentration of 0.8 nM with IC3 in the fluorescent label, so that the fluorescent label of the present invention The IC3 in it was confirmed that the fluorescence intensity was amplified about 13 times.

[実施例5]
(蛍光標識認識物を用いた免疫測定)
実施例4で調製した、蛍光標識認識物を用いて、ELISAによる免疫測定を行った。
前記蛍光標識認識物と認識部位を異にするαフェトプロテイン抗体を固定化した96穴ELISAプレート3枚に、αフェトプロテイン抗原(0〜50ng/ml)を1濃度につき2穴それぞれに50μl加えた。次に、実施例4で調製した蛍光標識認識物をリン酸緩衝液(pH7.0、50mM)で1/10倍希釈し、50μlづつ添加した。添加後、37℃の恒温槽で振盪させながら15分、10分および5分ずつ反応させた。反応終了後、0.01%トライトンX−100を含むトリス−塩酸緩衝液(pH7)で4回洗浄した。洗浄後、エタノール100μlを加え、蛍光プレートリーダー(ARVO−sx、ワラック社製)で蛍光強度を測定した。結果を図6に示す。図6のグラフの縦軸は蛍光強度(ARVO Intensity)を示し、横軸はαフェトプロテイン抗原(AFPと略記)の濃度を示す。
[Example 5]
(Immunoassay using fluorescent label recognition product)
Using the fluorescent label recognition product prepared in Example 4, immunoassay was performed by ELISA.
50 μl of α-fetoprotein antigen (0 to 50 ng / ml) was added to each of two wells per one concentration on three 96-well ELISA plates on which α-fetoprotein antibodies having different recognition sites from the fluorescent label recognition product were immobilized. Next, the fluorescent label recognition product prepared in Example 4 was diluted 1/10 times with a phosphate buffer (pH 7.0, 50 mM), and 50 μl was added. After the addition, the mixture was reacted for 15 minutes, 10 minutes and 5 minutes while shaking in a 37 ° C. constant temperature bath. After completion of the reaction, washing was performed 4 times with Tris-HCl buffer (pH 7) containing 0.01% Triton X-100. After washing, 100 μl of ethanol was added, and the fluorescence intensity was measured with a fluorescence plate reader (ARVO-sx, manufactured by Wallac). The results are shown in FIG. The vertical axis of the graph in FIG. 6 represents fluorescence intensity (ARVO Intensity), and the horizontal axis represents the concentration of α-fetoprotein antigen (abbreviated as AFP).

[比較例1]
(アルカリ性フォスファターゼ標識抗体の調製とELISAによるαフェトプロテインの測定)
市販のアルカリ性フォスファターゼ(ベーリンガーマンハイム社製)278μl(18mg/ml)を0.1Mリン酸緩衝液で平衡化したPD−10カラム(ファルマシア社製)を用いて緩衝液を置換した。得られたアルカリ性フォスファターゼをビバスピン(ザルトリウス社製、分子量30,000カット)で1mlまで濃縮し、この中にジメチルホルムアミドに溶解したGMBS(同仁化学社)5mg/mlを20μl加えた。室温で1時間反応後、前記と同じPD−10カラムを用いて未反応のGMBSとジメチルホルムアミドを取り除き、GMB化アルカリ性フォスファターゼを得た。
次に、αフェトプロテイン抗体2ml(2mg/ml、pH7リン酸緩衝液溶液)をPD−10カラム(ファルマシア社)で100mM炭酸緩衝液(pH8.5)に置換した。緩衝液を置換後、イミノチオラン117μl(1mg/ml)加え、37℃で1時間撹拌しながら反応させた。反応終了後、限外ろ過器(ザルトリウス社製、分子量30,000カット)で2ml以下まで濃縮した。濃縮後、PD−10カラム(pH6.3、50mMリン酸緩衝液で平衡化)で緩衝液を置換し、イミノチオラン化αフェトプロテイン抗体を得た。
前記GMB化アルカリ性フォスファターゼとイミノチオラン化αフェトプロテイン抗体を混和し、室温で2時間緩やかに撹拌し、反応させた。反応終了後スーパーデックス−200で精製し、アルカリ性フォスファターゼで標識化されたαフェトプロテイン抗体を得た。
[Comparative Example 1]
(Preparation of alkaline phosphatase-labeled antibody and measurement of α-fetoprotein by ELISA)
The buffer solution was replaced using a PD-10 column (Pharmacia) equilibrated with 278 μl (18 mg / ml) of commercially available alkaline phosphatase (Boehringer Mannheim) with 0.1 M phosphate buffer. The obtained alkaline phosphatase was concentrated to 1 ml with Vivaspine (manufactured by Sartorius, molecular weight 30,000 cut), and 20 μl of GMBS (Dojin Chemical) 5 mg / ml dissolved in dimethylformamide was added thereto. After reacting at room temperature for 1 hour, unreacted GMBS and dimethylformamide were removed using the same PD-10 column as described above to obtain a GMB alkaline phosphatase.
Next, 2 ml of α-fetoprotein antibody (2 mg / ml, pH 7 phosphate buffer solution) was replaced with 100 mM carbonate buffer (pH 8.5) with a PD-10 column (Pharmacia). After replacing the buffer solution, 117 μl (1 mg / ml) of iminothiolane was added, and the mixture was allowed to react with stirring at 37 ° C. for 1 hour. After completion of the reaction, the mixture was concentrated to 2 ml or less with an ultrafilter (manufactured by Sartorius, molecular weight 30,000 cut). After concentration, the buffer solution was replaced with a PD-10 column (pH 6.3, equilibrated with 50 mM phosphate buffer) to obtain an iminothiolanated α-fetoprotein antibody.
The GMB alkaline phosphatase and the iminothiolanated α-fetoprotein antibody were mixed and allowed to react by gently stirring at room temperature for 2 hours. After completion of the reaction, the product was purified with Superdex-200 to obtain an α-fetoprotein antibody labeled with alkaline phosphatase.

得られた前記標識抗体を用いて、αフェトプロテインの測定を行った。はじめに、標識抗体と認識部位を異にするαフェトプロテイン抗体を固定化した96穴ELISAプレート3枚に、αフェトプロテイン抗原0〜50ng/mlを1濃度につき2穴それぞれに50μl加えた。次に前記の標識抗体を、リン酸緩衝液(pH7.0、50mM)で1/2000倍希釈し、50μlそれぞれ添加した。添加後37℃の恒温槽で振盪させながら15分、10分および5分ずつ反応させた。反応終了後、0.01%トライトンX−100を含むトリス−塩酸緩衝液(pH7)で4回洗浄した。洗浄後、10mM p−ニトロフェニルリン酸ナトリウムを含む0.1Mジエタノールアミン−塩酸緩衝液(pH10.0、1mM塩化マグネシウム入り)基質液100μlを加え、37℃の恒温槽で振盪させながら酵素反応を20分間行った。反応終了後、1M水酸化ナトリウムを50μl加え、酵素反応を停止した。十分に撹拌した後、プレートリーダー(MTP−32、コロナ社製)で波長405/630nmにて吸光度の測定を行った。その結果を図7に示す。図7のグラフの縦軸は吸光度を示し、横軸はαフェトプロテイン抗原(AFPと略記)の濃度を示す。   Using the obtained labeled antibody, α-fetoprotein was measured. First, 50 μl of 0-50 ng / ml of α-fetoprotein antigen was added to each of two wells per one concentration on three 96-well ELISA plates on which α-fetoprotein antibody having a different recognition site from the labeled antibody was immobilized. Next, the labeled antibody was diluted 1/2000 times with a phosphate buffer (pH 7.0, 50 mM), and 50 μl was added. After the addition, the mixture was reacted for 15 minutes, 10 minutes and 5 minutes while shaking in a 37 ° C. constant temperature bath. After completion of the reaction, washing was performed 4 times with Tris-HCl buffer (pH 7) containing 0.01% Triton X-100. After washing, 100 μl of 0.1 M diethanolamine-hydrochloric acid buffer (pH 10.0, containing 1 mM magnesium chloride) substrate solution containing 10 mM sodium p-nitrophenyl phosphate was added, and the enzyme reaction was performed while shaking in a 37 ° C. constant temperature bath. Went for a minute. After the reaction, 50 μl of 1M sodium hydroxide was added to stop the enzyme reaction. After sufficiently stirring, the absorbance was measured at a wavelength of 405/630 nm with a plate reader (MTP-32, Corona). The result is shown in FIG. The vertical axis of the graph in FIG. 7 indicates absorbance, and the horizontal axis indicates the concentration of α-fetoprotein antigen (abbreviated as AFP).

図6および7のグラフを比較すると、標識認識物をELISAプレートに固定化する時間が同じ場合は、本発明のBODIPY−560で標識化する方法は、アルカリ性フォスファターゼで標識化する方法と同等の検出感度を有することが確認された。ただし、アルカリ性フォスファターゼで標識化する方法では、酵素反応時間を延長することにより、感度はさらに上昇し、BODIPY−560で標識化する方法では、蛍光検出における照射光のエネルギーを高くすれば、感度はさらに上昇する。   Comparing the graphs of FIGS. 6 and 7, when the time for immobilizing the label recognition product on the ELISA plate is the same, the method of labeling with BODIPY-560 of the present invention is equivalent to the method of labeling with alkaline phosphatase. It was confirmed to have sensitivity. However, in the method of labeling with alkaline phosphatase, the sensitivity is further increased by extending the enzyme reaction time. In the method of labeling with BODIPY-560, if the energy of irradiation light in fluorescence detection is increased, the sensitivity is increased. It rises further.

したがって、本発明の蛍光標識体を用いる方法は、従来の酵素反応を利用する方法と比較すると、同等の検出感度を持つうえ、高価な基質を必要とせず、酵素と基質を反応するステップを省略できるため、短時間での測定が可能であることが確認された。また、多数の蛍光体を抗体等に導入しても、蛍光標識体は変性を起こさないことが確認された。   Therefore, the method using the fluorescent label of the present invention has the same detection sensitivity as the conventional method using an enzyme reaction, does not require an expensive substrate, and omits the step of reacting the enzyme with the substrate. Therefore, it was confirmed that measurement in a short time was possible. It was also confirmed that even when a large number of phosphors were introduced into an antibody or the like, the fluorescent label did not denature.

本発明によれば、既存の蛍光体を利用して、蛍光強度の高い標識体を提供することができる。また、該蛍光標識体を用いることで、特殊な設備等を必要とせず、免疫測定等をより高感度で安価にかつ迅速に実施できるため、医療分野をはじめ他方面に有用な手段を提供するものである。   According to the present invention, a label having high fluorescence intensity can be provided using an existing phosphor. In addition, by using the fluorescent label, it is possible to carry out immunoassay, etc. with higher sensitivity, lower cost, and promptness without requiring special equipment, etc., thus providing a useful means for the other side including the medical field. Is.

本発明の蛍光標識体を示す模式図である。It is a schematic diagram which shows the fluorescent labeling body of this invention. 蛍光標識体中のBODIPY−560の蛍光強度を示すグラフである。It is a graph which shows the fluorescence intensity of BODIPY-560 in a fluorescent label. 蛍光標識体中のIC3の蛍光強度を示すグラフである。It is a graph which shows the fluorescence intensity of IC3 in a fluorescent label. BODIPY−560単独での蛍光強度を示すグラフである。It is a graph which shows the fluorescence intensity only by BODIPY-560. IC3単独での蛍光強度を示すグラフである。It is a graph which shows the fluorescence intensity only by IC3. BODIPY−560で標識化された蛍光標識認識物を用いて行なった免疫測定の結果を示すグラフである。It is a graph which shows the result of the immunoassay performed using the fluorescent-label recognition product labeled with BODIPY-560. アルカリ性フォスファターゼで標識化された標識認識物を用いて行なった免疫測定の結果を示すグラフである。It is a graph which shows the result of the immunoassay performed using the label | marker recognition substance labeled with alkaline phosphatase.

符号の説明Explanation of symbols

1・・・親水性重合体、 2・・・親水性置換基、 3・・・ポリエーテル誘導体、 4・・・蛍光体、 5・・・アニオン性基

DESCRIPTION OF SYMBOLS 1 ... Hydrophilic polymer, 2 ... Hydrophilic substituent, 3 ... Polyether derivative, 4 ... Phosphor, 5 ... Anionic group

Claims (7)

アニオン性基を有する親水性重合体に、ポリエーテル誘導体を介して蛍光体が結合された蛍光標識体であって、
前記アニオン性基を有する親水性重合体が、アニオン性基としてスルホン酸基またはその塩を有し、3−スルホプロピルメタクリレートおよび2−アクリルアミド−2−メチルプロパンスルホン酸からなる群より任意に選ばれる一種類以上と、2−アミノエチルメタクリレート、N−アクリロキシサクシニミド、N−ビニルジメチルアミンおよびN−ビニルジエチルアミンからなる群より任意に選ばれる一種類以上と、が重合されたものであり、
前記ポリエーテル誘導体が、ポリエチレングリコール誘導体またはポリプロピレングリコール誘導体であり、
前記蛍光体が、インダセン誘導体、フルオレセイン誘導体、ローダミン誘導体、インドカルボシアニン誘導体、フラザン誘導体、キサンテン色素体、シアニン色素体、クマリン色素体、ポルフィリン色素体または複合色素体であることを特徴とする蛍光標識体。
A fluorescent label in which a phosphor is bound to a hydrophilic polymer having an anionic group via a polyether derivative,
The hydrophilic polymer having an anionic group has a sulfonic acid group or a salt thereof as an anionic group, and is arbitrarily selected from the group consisting of 3-sulfopropyl methacrylate and 2-acrylamido-2-methylpropanesulfonic acid One or more types and one or more types arbitrarily selected from the group consisting of 2-aminoethyl methacrylate, N-acryloxysuccinimide, N-vinyldimethylamine and N-vinyldiethylamine are polymerized.
The polyether derivative is a polyethylene glycol derivative or a polypropylene glycol derivative;
A fluorescent label characterized in that the phosphor is an indacene derivative, a fluorescein derivative, a rhodamine derivative, an indocarbocyanine derivative, a furazane derivative, a xanthene dye, a cyanine dye, a coumarin dye, a porphyrin dye, or a complex dye body.
前記親水性重合体が、分子量5〜500kDaのものであることを特徴とする請求項に記載の蛍光標識体。 The fluorescent label according to claim 1 , wherein the hydrophilic polymer has a molecular weight of 5 to 500 kDa. 前記ポリエーテル誘導体が、ポリ(エチレングリコール)ビスアミノプロピルまたはポリ(プロピレングリコール)ビスアミノプロピルであり、分子量0.1〜50kDのものであることを特徴とする請求項1または2に記載の蛍光標識体。 The fluorescence according to claim 1 or 2 , wherein the polyether derivative is poly (ethylene glycol) bisaminopropyl or poly (propylene glycol) bisaminopropyl having a molecular weight of 0.1 to 50 kD. Marker. 前記蛍光体の数が1〜90個であることを特徴とする請求項1〜のいずれか一項に記載の蛍光標識体。 The number of the said fluorescent substance is 1-90 pieces, The fluorescent labeling object as described in any one of Claims 1-3 characterized by the above-mentioned. 請求項1〜のいずれか一項に記載の蛍光標識体と、蛋白質、ペプチド、抗体、抗原、ハプテン、受容体、核酸、ヌクレオチド、ヌクレオチド誘導体、天然もしくは合成薬剤、合成オリゴマー、合成ポリマー、ホルモン、リンフォカイン、サイトカイン、トキシン、リガンド、炭水化物、糖、オリゴ糖または多糖とを結合させて得られた、標識化された蛍光標識認識物。 The fluorescent label according to any one of claims 1 to 4 , and a protein, peptide, antibody, antigen, hapten, receptor, nucleic acid, nucleotide, nucleotide derivative, natural or synthetic drug, synthetic oligomer, synthetic polymer, hormone A labeled fluorescent label recognition product obtained by binding a lymphokine, a cytokine, a toxin, a ligand, a carbohydrate, a sugar, an oligosaccharide or a polysaccharide . 請求項に記載の蛍光標識認識物を含む免疫測定試薬。 An immunoassay reagent comprising the fluorescent label recognition product according to claim 5 . 請求項に記載の蛍光標識認識物を用いる免疫測定方法。 An immunoassay method using the fluorescent label recognition product according to claim 5 .
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