JP5726525B2 - 細胞および組織の凍結保存用組成物 - Google Patents
細胞および組織の凍結保存用組成物 Download PDFInfo
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- JP5726525B2 JP5726525B2 JP2010517770A JP2010517770A JP5726525B2 JP 5726525 B2 JP5726525 B2 JP 5726525B2 JP 2010517770 A JP2010517770 A JP 2010517770A JP 2010517770 A JP2010517770 A JP 2010517770A JP 5726525 B2 JP5726525 B2 JP 5726525B2
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- succinic anhydride
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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Description
ε-ポリ-L-リジン(チッソ社製、分子量4000)は25%水溶液のものを、ポリアリルアミン(日東紡、分子量5000(PAA-05L)、15000(PAA-L)、60000(PAA-H))は20%水溶液のものを用い、分子中のアミノ基に対し、モル%で0-100%の無水コハク酸(和光純薬工業製)を添加することでアミノ基のブロック率の異なるポリアミンを作成した。それぞれのポリアミン溶液をダルベッコ改変培地(DMEM、シグマアルドリッチ製)に0-10w/w%となるように添加した。この際、pHが7.0-8.0の範囲内になるように1Nの塩酸もしくは水酸化ナトリウム水溶液で中和した。また、溶液の浸透圧はWescor社製5520型蒸気圧法オズモメーターにて測定し、浸透圧の調整には10%塩化ナトリウム水溶液を用いた。
1×106個のL929, MG63, Caco-2細胞(大日本住友製薬), colon26, HT1080, B16F1, KB細胞(ATCC)をクライオバイアル(Simport Plastics)中で各凍結保存液1mLに懸濁し、-80℃のフリーザー中で凍結保存を行った。1週間後、37℃の温浴中で速やかに融解し、DMEMで洗浄したのち、トリパンブルー染色により生死判定を行った。また、解凍した細胞は6wellカルチャーディッシュに1×105個ずつ播種し、6時間後、24時間後のそれぞれの生存率をトリパンブルー染色により評価した。比較例としては一般的によく用いられている保存液である10%DMSO/ウシ胎児血清(FBS)を用いた。
L929細胞を用いた毒性試験を行った。10%ウシ胎児血清を含有したダルベッコ改変イーグルMEM培地(DMEM)に懸濁させたL929細胞を、96wellマイクロプレートに1.0×103cell/well播種し、37℃で72時間培養後、ε-ポリ-L-リジン、及び、種々の濃度の無水コハク酸を添加したポリリジンを、最終濃度0-10%となるように添加し、48時間後、未添加系をコントロールとして細胞の増殖が50%阻害される濃度をIC50とし、MTT法で求めた。その結果を表2に示す。比較例はDMSO系(10%DMSO/ウシ胎児血清)とした。表2の結果から知られるように、PLL無水コハク酸58%、63%、79%のIC50は、DMSO系の場合の2〜3倍であった。すなわち、上記実施例で用いた部分ブロック化ポリリジンの毒性は、従来一般的な凍結保存液の1/2〜1/3と判断された。特には、図1のデータにて細胞生存率が高かったPLL無水コハク酸63%と、PLL無水コハク酸58%とにおいて、IC50の値が特に大きかった。
ラット間葉系幹細胞(RMSC)の凍結保存を行った。比較例の保存液は10%DMSO/ウシ胎児血清であり、実施例の保存液はPLL無水コハク酸63%の7.5%溶液(図4中に7.5%PLL(0.63)と表示)である。
臍帯血は、血液抗凝固剤(EDTA2Na)を10.5mg充填された7mLプラスチック製真空採血管(テルモ株式会社製、ベノジェクト2真空採血管)を使用してヒト臍帯より採取した。次いで、このように抗凝固剤を添加したヒト臍帯血中に、7.5%となるようにPLL無水コハク酸63%(7.5%PLL(0.63))を添加し、-80℃のフリーザー中で3ヶ月間凍結保存した。37℃の温浴中で速やかに融解し、希釈等を行わないままのヒト臍帯血を一部採取して、造血幹細胞の表面マーカーであるCD34の発現率をフローサイトメトリー法を用いて測定した。CD34造血幹細胞数をフローサイトメトリーを用いて、文献(A. Higuchi et al., J. Biomed. Mater. Res., 68A, 34-42 (2004))記載の常法により測定した。すなわち、CD34造血幹細胞数は、Stem-Kit(ベックマン・コールター社製)を用いて、そのマニュアル(国際血液療法・移植学会 ISHAGEガイドライン)に従って行った。3ヶ月後においても、CD34造血幹細胞数は、初日に計測された70%前後の細胞数が観察された。一方、10%DMSO溶液で凍結保存したヒト臍帯血中のCD34造血幹細胞数は、初日に計測された20%前後の細胞数であった。このように、ε-ポリ-L-リジンを添加した保存液でヒト臍帯血を保存すると、CD34造血幹細胞を未分化の状態で長期間保存できることが明らかとなった。
PLL(ε-ポリ-L-リジン)および無水コハク酸処理PLLの不凍タンパク質活性を調べた。すなわち、氷の再結晶を阻害する効果について調べた。不凍タンパクには種々の特殊な活性が知られており、氷の表面に吸着することなどにより、熱ヒステリシス、氷の再結晶成長抑制、氷晶の六方晶もしくはバイピラミッド状への形態変化を引き起こすことが知られている(特許文献3〜4)。
凍結濃縮防止(凍結融解寒天ゲル);寒天末(1級試薬 ナカライテスク(株)社製)にPLL無水コハク酸63%を添加して5%溶液を調整し、この溶液に赤色インクを添加しプラスチック容器に入れ−20℃にて凍結した後、常温で解凍した。結果を図7の写真に示す。左が無添加のもの、右がPLL琥珀酸誘導体5%添加のものである。無添加のものは赤色の部分(不透明な上半部)と、透明な部分(ゲルを載せた箇所の右上に影を生じさせているが、ゲルの下方のペーパータオルのメッシュ模様が透けて見えている部分)とに、明らかに分離しているのが解かる。一方、PLL琥珀酸誘導体5%添加物は解凍ゲル全体が均一に赤色を呈し、凍結濃縮が防止できているのが知られた。
Claims (5)
- 生理的溶液中に、数平均分子量1000〜2万のポリ−L−リジン、または、重量平均分子量1000〜2万のポリアリルアミンのアミノ基の50〜99モル%について、無水コハク酸を反応させてカルボキシル化することでブロックしたものを1〜50w/w%溶解させたことを特徴とする細胞および組織の凍結保存用組成物。
- 前記高分子化合物のアミノ基の50〜93モル%について、無水カルボン酸を反応させてカルボキシル化することでブロックしたことを特徴とする請求項1に記載の凍結保存用組成物。
- 生理的溶液が、生理食塩水、ダルベッコ改変イーグルMEM培地(DMEM)、または、その他の細胞・組織用の培養液であることを特徴とする請求項1または2に記載の凍結保存用組成物。
- 数平均分子量1000〜2万のポリ−L−リジン、または、重量平均分子量1000〜2万のポリアリルアミンに対し、そのアミノ基の50〜99モル%について、無水コハク酸を反応させてカルボキシル化することでブロックしたことを特徴とする、食品または医薬品の凍結保存用または凍結乾燥用の添加剤組成物。
- 数平均分子量1000〜2万のポリ−L−リジン、または、重量平均分子量1000〜2万のポリアリルアミンに対し、そのアミノ基の50〜99モル%について、無水コハク酸を反応させてカルボキシル化することでブロックしたものを、食品または医薬品の含水原料組成物に、1〜15w/w%となるように配合し、この後、凍結、または、凍結及び凍結乾燥を行うことを特徴とする食品または医薬品の製造方法。
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HK1196034A1 (zh) | 2014-12-05 |
US9826732B2 (en) | 2017-11-28 |
KR20110055522A (ko) | 2011-05-25 |
CN102124098B (zh) | 2014-03-12 |
US20140243426A1 (en) | 2014-08-28 |
KR101457749B1 (ko) | 2014-11-03 |
KR20140072209A (ko) | 2014-06-12 |
CN103858859A (zh) | 2014-06-18 |
EP2305792A1 (en) | 2011-04-06 |
CN103858859B (zh) | 2015-11-04 |
WO2009157209A1 (ja) | 2009-12-30 |
EP2305792B1 (en) | 2016-04-20 |
CN102124098A (zh) | 2011-07-13 |
US20110172315A1 (en) | 2011-07-14 |
US20160309706A1 (en) | 2016-10-27 |
US9603355B2 (en) | 2017-03-28 |
KR101490093B1 (ko) | 2015-02-04 |
JPWO2009157209A1 (ja) | 2011-12-08 |
EP2305792A4 (en) | 2012-07-25 |
HK1156970A1 (zh) | 2012-06-22 |
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