JP2011195475A - Dance protein solution - Google Patents

Dance protein solution Download PDF

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JP2011195475A
JP2011195475A JP2010061468A JP2010061468A JP2011195475A JP 2011195475 A JP2011195475 A JP 2011195475A JP 2010061468 A JP2010061468 A JP 2010061468A JP 2010061468 A JP2010061468 A JP 2010061468A JP 2011195475 A JP2011195475 A JP 2011195475A
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dance
dance protein
solution
protein
gelatin
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JP5769379B2 (en
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Shigehiko Suzuki
茂彦 鈴木
Motoko Naito
素子 内藤
Tomoyuki Nakamura
智之 中邨
Yuki Sakamoto
悠紀 坂元
Shojiro Matsuda
晶二郎 松田
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Gunze Ltd
Kyoto University
Kansai Medical University
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Gunze Ltd
Kyoto University
Kansai Medical University
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Abstract

PROBLEM TO BE SOLVED: To provide a DANCE (developmental arteries and neural crest epidermal) protein solution having excellent stability and a method for stabilizing a DANCE protein (fibulin-5) solution.SOLUTION: The DANCE protein solution includes a DANCE protein and one or more compounds selected from the group consisting of gelatin, albumin, hydroxyethyl starch and serum. The DANCE protein solution has excellent stability and maintains activity of DANCE protein even after passage of a fixed time and has activity of DANCE protein even by repeated freezing and thawing.

Description

本発明は、安定性に優れるDANCEタンパク質溶液に関する。また、本発明はDANCEタンパク質溶液の安定化方法に関する。   The present invention relates to a DANCE protein solution having excellent stability. The present invention also relates to a method for stabilizing a DANCE protein solution.

ヒトの生体組織の中でも肺や血管、皮膚等の組織は、弾性、伸縮性に富んだ組織であるが、加齢とともに血管が硬くなる、あるいは皮膚がたるむといった生体組織の弾性が失われていく加齢現象が生じる。これは、生体組織に存在する弾性線維という、ゴムのような柔軟性と弾力を有する線維組織が劣化してしまうためであると考えられている。この弾性線維は、劣化・分解しても再生されることはないとされており、このような弾性線維の再生についての研究が数多くなされている。   Among human biological tissues, tissues such as lungs, blood vessels, and skin are highly elastic and stretchable, but the elasticity of biological tissues such as blood vessels become harder or skin becomes sluggish with age. An aging phenomenon occurs. This is considered to be due to the deterioration of a fibrous tissue having flexibility and elasticity like rubber, which is an elastic fiber present in a living tissue. This elastic fiber is said not to be regenerated even when it is degraded or decomposed, and many studies have been conducted on the regeneration of such elastic fiber.

近年、弾性線維の形成能を有する細胞の無血清培養において、DANCE(developmental arteries and neural crest epidermal growth factor(EGF)−like;fibulin−5ともいう)という分泌蛋白質を加えることにより効率よく弾性線維を再生できることが見出された(例えば、特許文献1参照)。   In recent years, in serum-free culture of cells having the ability to form elastic fibers, elastic fibers can be efficiently added by adding a secreted protein called DANCE (developmental arteries and neural epidermal growth factor (EGF) -like; also referred to as fibulin-5). It was found that it can be reproduced (see, for example, Patent Document 1).

しかしながら、このDANCEタンパク質を溶液にすると、経時的に活性が低下するという問題があった。   However, when this DANCE protein is made into a solution, there is a problem that the activity decreases with time.

国際公開第2006/082763パンフレットInternational Publication No. 2006/082763 Pamphlet

本発明は、安定性に優れるDANCEタンパク質溶液を提供することを目的とする。また、DANCEタンパク質溶液の安定化方法を提供することを目的とする。   An object of this invention is to provide the DANCE protein solution excellent in stability. It is another object of the present invention to provide a method for stabilizing a DANCE protein solution.

本発明者は、上記の課題を解決するために鋭意研究を行った結果、特定の物質が存在することでDANCEタンパク質溶液の安定性が優れることを見いだした。かかる知見に基づき、さらに研究を重ねて本発明を完成するに至った。   As a result of intensive studies to solve the above problems, the present inventor has found that the presence of a specific substance is excellent in the stability of the DANCE protein solution. Based on this knowledge, further studies have been made and the present invention has been completed.

即ち、本発明は下記のDANCEタンパク質溶液及びDANCEタンパク質溶液の安定化方法を提供する。
項1.ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物及びDANCEタンパク質を含む、DANCEタンパク質溶液。
項2.ゼラチンが、アルカリ処理ゼラチンである上記項1に記載のDANCEタンパク質溶液。
項3.DANCEタンパク質溶液のpHが、5〜14である上記項1又は2に記載のDANCEタンパク質溶液。
項4.DANCEタンパク質を含む溶液に、ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物を添加することを特徴とする、DANCEタンパク質溶液の安定化方法。
That is, the present invention provides the following DANCE protein solution and the method for stabilizing the DANCE protein solution.
Item 1. A DANCE protein solution comprising one or more compounds selected from the group consisting of gelatin, albumin and hydroxyethyl starch and DANCE protein.
Item 2. Item 2. The DANCE protein solution according to Item 1, wherein the gelatin is alkali-treated gelatin.
Item 3. Item 3. The DANCE protein solution according to Item 1 or 2, wherein the pH of the DANCE protein solution is 5 to 14.
Item 4. A method for stabilizing a DANCE protein solution, comprising adding one or more compounds selected from the group consisting of gelatin, albumin and hydroxyethyl starch to a solution containing DANCE protein.

本発明のDANCEタンパク質溶液は、安定性が良好で、ある一定時間経過後においても、DANCEタンパク質の活性を維持することができる。また、凍結融解を繰り返してもDANCEタンパク質の活性を維持することができるものである。   The DANCE protein solution of the present invention has good stability and can maintain the activity of the DANCE protein even after a certain period of time. Further, the activity of the DANCE protein can be maintained even after repeated freeze-thawing.

1.DANCEタンパク質溶液
「DANCEタンパク質」とは、fibulin−5とも呼ばれる分泌蛋白質であり、弾性線維を構成する分子であることが知られている。
1. The DANCE protein solution “DANCE protein” is a secreted protein also called fibulin-5, and is known to be a molecule constituting an elastic fiber.

本発明で用いるDANCEタンパク質は、ヒト由来のヒトDANCEタンパク質、又は、そのオルソログ、あるいはそれらの変異体(SNP、ハプロタイプを含む)を含む。   The DANCE protein used in the present invention includes a human-derived human DANCE protein, an ortholog thereof, or a mutant thereof (including SNP and haplotype).

DANCEタンパク質のオルソログは特に限定されず、例えば任意の動物、好ましくは哺乳動物に由来するものであり得る。哺乳動物としては、例えば、ウシ、ヒツジ、ブタ、ヤギ、サル、ウサギ、ラット、ハムスター、モルモット、マウス等が挙げられる。   The ortholog of the DANCE protein is not particularly limited, and can be derived from any animal, preferably a mammal. Examples of mammals include cattle, sheep, pigs, goats, monkeys, rabbits, rats, hamsters, guinea pigs, mice and the like.

DANCEタンパク質については、例えば、国際公開第2006/082763パンフレット等に記載されている。   About DANCE protein, it describes in the international publication 2006/082763 pamphlet etc., for example.

本発明のDANCEタンパク質溶液におけるDANCEタンパク質濃度は、特に限定されるものではなく、所望の濃度にすることができるが、例えば、1〜10μg/mL程度であることが好ましく、9〜10μg/mL程度であることがより好ましい。DANCEタンパク質濃度が前記範囲内にあることで、希釈しすぎることによって生じるDANCEタンパク質の変性や、活性再現性の低下を防ぐことができるため好ましい。   The DANCE protein concentration in the DANCE protein solution of the present invention is not particularly limited and can be a desired concentration, but is preferably about 1 to 10 μg / mL, for example, about 9 to 10 μg / mL. It is more preferable that It is preferable for the DANCE protein concentration to be within the above-mentioned range since it is possible to prevent the DANCE protein from being denatured and the activity reproducibility from being reduced by excessive dilution.

本発明のDANCEタンパク質溶液は、DANCEタンパク質以外に、ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物を含むものである。   The DANCE protein solution of the present invention contains one or more compounds selected from the group consisting of gelatin, albumin and hydroxyethyl starch in addition to the DANCE protein.

ゼラチンは、酸性、塩基性両アミノ酸を含む両性電解質であり、等電点4〜6程度のアルカリ処理ゼラチンであることが、DANCEタンパク質溶液の安定性の点から好ましい。より好ましいゼラチンの等電点は、5〜6程度である。   Gelatin is an ampholyte containing both acidic and basic amino acids, and is preferably alkali-treated gelatin having an isoelectric point of about 4 to 6 from the viewpoint of the stability of the DANCE protein solution. A more preferable isoelectric point of gelatin is about 5-6.

このようなアルカリ処理ゼラチンとしては、市販のものを好適に用いることができ、例えば、ゼラチン粉末(♯250、新田ゼラチン(株)製、等電点:5)、ニワトリゼラチン(ニッポンハム(株)製)等を挙げることができる。   As such alkali-treated gelatin, commercially available products can be suitably used. For example, gelatin powder (# 250, manufactured by Nitta Gelatin Co., Ltd., isoelectric point: 5), chicken gelatin (Nippon Ham Co., Ltd.) )) And the like.

本発明のDANCEタンパク質溶液のpHは特に限定はされないが、5〜14の弱酸性〜アルカリ性であることが好ましく、6〜11がより好ましい。pHがこの範囲にあることで、DANCEタンパク質溶液の安定性に優れるため好ましい。   The pH of the DANCE protein solution of the present invention is not particularly limited, but it is preferably 5 to 14 weakly acidic to alkaline, and more preferably 6 to 11. It is preferable for the pH to be in this range since the stability of the DANCE protein solution is excellent.

アルブミンは、卵白アルブミン、乳中のラクトアルブミン、血清アルブミン等を挙げることができるが、これらの中でも、血清アルブミンが好ましい。   Examples of albumin include ovalbumin, lactalbumin in milk, serum albumin, and the like. Among these, serum albumin is preferable.

また、ゼラチン、アルブミン等のタンパク質の由来は特に限定されるものではなく、牛、豚、魚、植物および遺伝子組み換え体のいずれも用いることができる。   The origin of proteins such as gelatin and albumin is not particularly limited, and any of cows, pigs, fish, plants and genetically modified organisms can be used.

ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物の濃度としては特に限定されるものではないが、例えば、0.05〜10重量%程度であることが好ましく、0.1〜5重量%程度であることがより好ましい。   The concentration of one or more compounds selected from the group consisting of gelatin, albumin, and hydroxyethyl starch is not particularly limited, but is preferably about 0.05 to 10% by weight, for example. More preferably, it is about 1 to 5% by weight.

また、本発明のDANCEタンパク質溶液に用いる溶媒としては、特に限定されるものではないが、例えば、水(蒸留水)、PBS、Carmody緩衝液、Tris緩衝液等を挙げることができる。これらの中でも、不純物が混入していない点から水(蒸留水)が好ましい。   The solvent used in the DANCE protein solution of the present invention is not particularly limited, and examples thereof include water (distilled water), PBS, Carmody buffer, Tris buffer, and the like. Among these, water (distilled water) is preferable because impurities are not mixed.

2.DANCEタンパク質溶液の製造方法
本発明のDANCEタンパク質溶液の製造方法は特に限定されるものではなく、DANCEタンパク質、ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物、及び溶媒を所定量混合することで製造することができる。
2. Method for Producing DANCE Protein Solution The method for producing the DANCE protein solution of the present invention is not particularly limited, and one or more compounds selected from the group consisting of DANCE protein, gelatin, albumin and hydroxyethyl starch, and a solvent are used. It can be manufactured by mixing a predetermined amount.

本発明のDANCEタンパク質溶液を作製するにあたり、DANCEタンパク質を粉末のまま用いてもよいが、一旦溶媒等に溶かしてDANCEタンパク質を溶液とした後、本発明のDANCEタンパク質溶液とすることができる。   In preparing the DANCE protein solution of the present invention, the DANCE protein may be used as a powder. However, after the DANCE protein is dissolved in a solvent or the like to form a DANCE protein solution, the DANCE protein solution of the present invention can be obtained.

その際に用いる溶媒としては、特に限定されるものではなく、例えば、水(蒸留水)、PBS、Carmody緩衝液、Tris緩衝液等を挙げることができる。これらの中でも、不純物が混入していない点から水(蒸留水)が好ましい。   The solvent used in that case is not particularly limited, and examples thereof include water (distilled water), PBS, Carmody buffer, Tris buffer, and the like. Among these, water (distilled water) is preferable because impurities are not mixed.

その場合の濃度は、特に限定されるものではないが、1〜30μg/mL程度が好ましく、1〜20μg/mL程度が好ましい。濃度をこの範囲にすることで、DANCEタンパク質の活性を低下させることなく本発明のDANCEタンパク質溶液とするための希釈をすることができるため好ましい。   The concentration in that case is not particularly limited, but is preferably about 1 to 30 μg / mL, and preferably about 1 to 20 μg / mL. By making the concentration within this range, it is preferable because the DANCE protein solution of the present invention can be diluted without reducing the activity of the DANCE protein.

3.DANCEタンパク質溶液の安定化方法
本発明は、DANCEタンパク質溶液の安定化方法に関する。
3. Stabilizing method invention of DANCE protein solution relates to a method stabilization of DANCE protein solution.

本発明の安定化方法は、DANCEタンパク質を含む溶液に、ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物を添加するという極めて簡単な方法により、DANCEタンパク質溶液を安定に保存することができるものである。   The stabilization method of the present invention stabilizes a DANCE protein solution by a very simple method of adding one or more compounds selected from the group consisting of gelatin, albumin and hydroxyethyl starch to a solution containing DANCE protein. It can be saved.

DANCEタンパク質や、ゼラチン、アルブミン及びヒドロキシエチルスターチからなる群から選択される1種以上の化合物、又は溶媒等の種類や添加量等については、前述の通りである。   The type and amount of the DANCE protein, one or more compounds selected from the group consisting of gelatin, albumin, and hydroxyethyl starch, or the solvent are as described above.

以下、実施例及び比較例を挙げて本発明を説明するが、本発明はこれらの実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated, this invention is not limited to these Examples.

製造例1(DANCE水溶液の調整方法)
凍結乾燥されたDANCEタンパク質(ヒト由来)の粉末4μgを蒸留水で溶解し、10μg/mLのDANCEタンパク質の水溶液Aを作製した。
Production Example 1 (Method for preparing DANCE aqueous solution)
4 μg of freeze-dried DANCE protein (human-derived) powder was dissolved in distilled water to prepare an aqueous solution A of 10 μg / mL DANCE protein.

実施例1
等電点が5(pI5)のゼラチン粉末(♯250、新田ゼラチン(株)製)を蒸留水で溶解して、0.3重量%ゼラチン水溶液(pH7)を作製した。
Example 1
Gelatin powder having an isoelectric point of 5 (pI5) (# 250, manufactured by Nitta Gelatin Co., Ltd.) was dissolved in distilled water to prepare a 0.3 wt% gelatin aqueous solution (pH 7).

前記pI5ゼラチン水溶液(pH7)3mL中に、製造例1で調整したDANCEタンパク質の水溶液A30μLを添加し、37℃のインキュベーターで静置した。   To 3 mL of the pI5 gelatin aqueous solution (pH 7), 30 μL of the DANCE protein aqueous solution A prepared in Production Example 1 was added and allowed to stand in a 37 ° C. incubator.

実施例2
アルブミン(商品名:アルブミン牛血清製、コーンフラクションV、pH7.0、和光純薬工業(株)製)を蒸留水で溶解して、0.3重量%アルブミン水溶液を作製した。
Example 2
Albumin (trade name: manufactured by Albumin Bovine Serum, Corn Fraction V, pH 7.0, manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in distilled water to prepare a 0.3% by weight albumin aqueous solution.

pI5ゼラチン水溶液(pH7)に代えて、前記アルブミン水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that the albumin aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

実施例3
ヒドロキシエチルスターチ(SIGMA製)の粉末を蒸留水に溶解して、0.3重量%ヒドロキシエチルスターチ水溶液を作製した。
Example 3
Hydroxyethyl starch (manufactured by SIGMA) powder was dissolved in distilled water to prepare a 0.3 wt% hydroxyethyl starch aqueous solution.

pI5ゼラチン水溶液(pH7)に代えて、前記ヒドロキシエチルスターチ水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that the hydroxyethyl starch aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

実施例4
等電点が5(pI5)のゼラチン粉末(♯250、新田ゼラチン(株)製)を蒸留水で溶解して、0.3重量%ゼラチン水溶液(pH7)を作製した。
Example 4
Gelatin powder having an isoelectric point of 5 (pI5) (# 250, manufactured by Nitta Gelatin Co., Ltd.) was dissolved in distilled water to prepare a 0.3 wt% gelatin aqueous solution (pH 7).

前記pI5ゼラチン水溶液(pH7)1mL中に、製造例1で調製したDANCEタンパク質の水溶液A 10μLを添加した。この溶液を−20℃で0.5時間凍結し、その後37℃で融解させ、この操作を10回繰り返した。   To 1 mL of the pI5 gelatin aqueous solution (pH 7), 10 μL of the DANCE protein aqueous solution A prepared in Production Example 1 was added. This solution was frozen at −20 ° C. for 0.5 hour, then thawed at 37 ° C., and this operation was repeated 10 times.

比較例1
0.3重量%コラーゲン水溶液(Cellmatrix TypeI−P、新田ゼラチン(株)製)を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。
Comparative Example 1
A DACNE protein solution was prepared in the same manner as in Example 1 except that a 0.3 wt% collagen aqueous solution (Cellmatrix Type IP, manufactured by Nitta Gelatin Co., Ltd.) was used.

比較例2
0.3重量%コラーゲン水溶液(Cellmatrix TypeI−P、新田ゼラチン(株)製)を蒸留水で希釈し、0.03重量%コラーゲン水溶液を作製した。
Comparative Example 2
A 0.3 wt% collagen aqueous solution (Cellmatrix Type IP, manufactured by Nitta Gelatin Co., Ltd.) was diluted with distilled water to prepare a 0.03% wt collagen aqueous solution.

pI5ゼラチン水溶液(pH7)に代えて、0.03重量%コラーゲン水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that a 0.03% by weight collagen aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

比較例3
デキストラン200,000(和光純薬工業(株)製:平均分子量180,000〜210,000)の粉末を蒸留水に溶解して、0.3重量%デキストラン水溶液を作製した。
Comparative Example 3
A powder of dextran 200,000 (manufactured by Wako Pure Chemical Industries, Ltd .: average molecular weight 180,000-210,000) was dissolved in distilled water to prepare a 0.3 wt% dextran aqueous solution.

pI5ゼラチン水溶液(pH7)に代えて、0.3重量%デキストラン水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that a 0.3 wt% dextran aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

比較例4
鶏冠由来ヒアルロン酸ナトリウム(和光純薬工業(株)製)を蒸留水に溶解して、0.3重量%ヒアルロン酸ナトリウム水溶液を作製した。
Comparative Example 4
Chicken crown-derived sodium hyaluronate (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in distilled water to prepare a 0.3% by weight sodium hyaluronate aqueous solution.

pI5ゼラチン水溶液(pH7)に代えて、0.3重量%ヒアルロン酸ナトリウム水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that a 0.3% by weight sodium hyaluronate aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

比較例5
ヘパリン(和光純薬工業(株)製:100,000units)の粉末を蒸留水に溶解して、0.3重量%ヘパリン水溶液を作製した。
Comparative Example 5
Heparin powder (manufactured by Wako Pure Chemical Industries, Ltd .: 100,000 units) was dissolved in distilled water to prepare a 0.3 wt% aqueous heparin solution.

pI5ゼラチン水溶液(pH7)に代えて、0.3重量%ヘパリン水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that a 0.3 wt% heparin aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

比較例6
コンドロイチン硫酸Cナトリウム(和光純薬工業(株)製)の粉末を蒸留水に溶解して、0.3重量%コンドロイチン硫酸Cナトリウム水溶液を作製した。
Comparative Example 6
A powder of chondroitin sulfate C sodium (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in distilled water to prepare a 0.3 wt% aqueous solution of chondroitin sulfate C sodium.

pI5ゼラチン水溶液(pH7)に代えて、0.3重量%コンドロイチン硫酸Cナトリウム水溶液を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。   A DACNE protein solution was prepared in the same manner as in Example 1 except that a 0.3 wt% chondroitin sulfate C sodium aqueous solution was used instead of the pI5 gelatin aqueous solution (pH 7).

比較例7〜9
pI5ゼラチン水溶液(pH7)に代えて、蒸留水、リン酸緩衝食塩水(PBS(−))、血清を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製した。
Comparative Examples 7-9
A DACNE protein solution was prepared in the same manner as in Example 1 except that distilled water, phosphate buffered saline (PBS (-)), and serum were used instead of the pI5 gelatin aqueous solution (pH 7).

比較例10
pI5ゼラチン水溶液(pH7)に代えて、リン酸緩衝食塩水(PBS(−))を用いた以外は、実施例1と同様にしてDACNEタンパク質溶液を作製し、実施例4と同様に凍結、融解させた。また、実施例4と同様にこの操作を10回繰り返した。
Comparative Example 10
A DACNE protein solution was prepared in the same manner as in Example 1 except that phosphate buffered saline (PBS (-)) was used in place of the pI5 gelatin aqueous solution (pH 7), and frozen and thawed in the same manner as in Example 4. I let you. In addition, this operation was repeated 10 times as in Example 4.

試験方法
実施例1〜3、比較例1〜9で得られたDANCEタンパク質溶液について、DANCEタンパク質添加0時間、1日、3日、7日後に溶液を500μLずつ採取し、下記方法によりDANCEタンパク質濃度を測定した。
About the DANCE protein solutions obtained in Test Methods Examples 1 to 3 and Comparative Examples 1 to 9, 500 μL of the solutions were collected at 0 hour, 1 day, 3 days, and 7 days after addition of DANCE protein, and the concentration of DANCE protein was determined by the following method. Was measured.

また、参考実験として、上記実施例、比較例で用いた各種溶液について、DANCEタンパク質なしのブランク試料についても、同様の測定をした。   In addition, as a reference experiment, the same measurement was performed on blank samples without DANCE protein for the various solutions used in the above Examples and Comparative Examples.

実施例4および比較例10で得られたDANCEタンパク質溶液について、溶液を500μLずつ採取し、下記方法によりDANCEタンパク質濃度を測定した。
(測定方法)
抗体は、マウス抗DANCEタンパク質IgGを用いた。測定キット(製造元:エヌビィ健康研究所)を用い、実施例1〜4、比較例1〜10のDANCEタンパク質溶液のDANCEタンパク質濃度をELISA法により測定した。
(測定結果1)
実施例1〜3および比較例1〜9の測定結果を表1に示す。
About the DANCE protein solution obtained in Example 4 and Comparative Example 10, 500 μL of the solution was sampled and the DANCE protein concentration was measured by the following method.
(Measuring method)
Mouse anti-DANCE protein IgG was used as the antibody. Using a measurement kit (manufacturer: NU Health Laboratory), the DANCE protein concentrations of the DANCE protein solutions of Examples 1 to 4 and Comparative Examples 1 to 10 were measured by ELISA.
(Measurement result 1)
The measurement results of Examples 1 to 3 and Comparative Examples 1 to 9 are shown in Table 1.

Figure 2011195475
Figure 2011195475

(測定結果2)
実施例4で得られた溶液中のDANCEタンパク質の濃度は、凍結と融解を1回ずつ行った場合には22.4ng/ml、10回繰り返した場合には16.7ng/mlであった。これに対して比較例10で得られた溶液中のDANCEタンパク質の濃度は、凍結と融解を1回ずつ行った場合には2.6ng/ml、10回繰り返した場合には0.0ng/mlであった。
(Measurement result 2)
The concentration of DANCE protein in the solution obtained in Example 4 was 22.4 ng / ml when frozen and thawed once, and 16.7 ng / ml when repeated 10 times. On the other hand, the concentration of DANCE protein in the solution obtained in Comparative Example 10 was 2.6 ng / ml when frozen and thawed once, and 0.0 ng / ml when repeated 10 times. Met.

実施例1〜3より、本発明のDANCEタンパク質溶液は、DANCE添加後7日を経過しても、充分なDANCEタンパク質濃度を有しており、DANCEタンパク質溶液の安定性が非常に高いことがわかる。   From Examples 1 to 3, it can be seen that the DANCE protein solution of the present invention has a sufficient DANCE protein concentration even after 7 days from the addition of DANCE, and the stability of the DANCE protein solution is very high. .

一方、比較例1〜8では、いずれもDANCEタンパク質濃度が10ng/mL以下にまで減少しており、DANCEタンパク質の活性が経時的に低下していることがわかる。   On the other hand, in each of Comparative Examples 1 to 8, the DANCE protein concentration decreased to 10 ng / mL or less, indicating that the activity of the DANCE protein decreased with time.

また、比較例9の血清については、そのブランク試験結果からも明らかなように、もともと血清中にDANCEタンパク質が存在するため、このような結果になったと考えられる。   In addition, as apparent from the blank test results, the serum of Comparative Example 9 is considered to have such a result because the DANCE protein originally exists in the serum.

実施例4と比較例10から、ゼラチン溶液中にDANCEタンパク質を保持することによって、凍結、融解の繰り返しに対しても安定的に保存できることがわかった。   From Example 4 and Comparative Example 10, it was found that by keeping the DANCE protein in the gelatin solution, it can be stably stored against repeated freezing and thawing.

Claims (4)

ゼラチン、アルブミン、ヒドロキシエチルスターチ及び血清からなる群から選択される1種以上の化合物及びDANCEタンパク質を含む、DANCEタンパク質溶液。 A DANCE protein solution comprising one or more compounds selected from the group consisting of gelatin, albumin, hydroxyethyl starch and serum and DANCE protein. ゼラチンが、アルカリ処理ゼラチンである請求項1に記載のDANCEタンパク質溶液。 The DANCE protein solution according to claim 1, wherein the gelatin is alkali-treated gelatin. DANCEタンパク質溶液のpHが、5〜14である請求項1又は2に記載のDANCEタンパク質溶液。 The DANCE protein solution according to claim 1 or 2, wherein the pH of the DANCE protein solution is 5 to 14. DANCEタンパク質を含む溶液に、ゼラチン、アルブミン、ヒドロキシエチルスターチ及び血清からなる群から選択される1種以上の化合物を添加することを特徴とする、DANCEタンパク質溶液の安定化方法。 A method for stabilizing a DANCE protein solution, comprising adding one or more compounds selected from the group consisting of gelatin, albumin, hydroxyethyl starch and serum to a solution containing DANCE protein.
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