JP2017528159A - 植物由来組換えヒト血清アルブミン及び植物性ペプチドを有効成分として含有する細胞保存用組成物 - Google Patents
植物由来組換えヒト血清アルブミン及び植物性ペプチドを有効成分として含有する細胞保存用組成物 Download PDFInfo
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Abstract
Description
本発明の他の目的は、上記組成物を用いて細胞を保存する方法を提供することにある。
実施例.アニマルフリー及びゼノフリー細胞保存用組成物の製造
幹細胞または初代培養細胞をゼノフリーで安定的に保存することができる常温または低温保存用の細胞保存用組成物を製造するために、イネ(rice)から抽出したヒト組換えアルブミン(rAlbumin ACF,Sheffield Bio-Science,USA)及び大豆(soybean)から抽出した植物性ペプチド(UltraPepTMSoy,Sheffield Bio-Science,USA)を有効成分として利用しフェノールレッドが含有されていない基本培地に混合して細胞保存用組成物を製造し、これをCEFO−viveと名付けた。製造された保存用組成物に、ヒト組換えアルブミンは1重量%使用し、植物性ペプチドは5重量%使用した。上記植物性ペプチドのアミノ酸組成を下記表1に表示した。また、細胞保存用組成物CEFO−vivoの具体的な無機塩類、アミノ酸、ビタミン、核酸成分及びその他成分の含量を表2、表3、表4、表5 及び表6に示した。
<幹細胞または初代培養細胞の準備>
患者から寄贈された臍帯(Umbilical cord)、脂肪組職(adipose)及び骨髄(Bone marrow)から各々UCMSC(Umbilical cord mesenchymal stem cell)、ADMSC(adipose derived mesenchymal stem cell)及びBMMSC(Bone marrow-derived mesenchymal stem cell)を直接抽出した。上記幹細胞の培養液としては、CEFOgroTMUCMSC、CEFOgroTMADMSC及びCEFOgroTMBMMSC 培地(基本培地)を使った。初代培養細胞としては、ヒト皮膚由来線維芽細胞(Human diploid fibroblast,HDF)を使い、CEFOgroTMHF培地で培養した。上記細胞は、37℃、5%CO2の条件の培養器で培養し、3日に一回ずつ培養液を交換して維持した。本発明の全ての実験は、 (株)細胞バイオの器官生命倫理審議委員会の承認を受けて生命倫理及び安全に関する法律による手順及び方法を通して進行された。
幹細胞であるUCMSC、ADMSC及びBMMSCをそれぞれの基本培地で培養した後、トリプシンを処理して細胞別にそれぞれ捕集した。捕集したそれぞれの細胞を上記実施例の細胞保存用組成物(CEFO−vive)、基本培地または生理食塩水にそれぞれ入れて冷蔵保管(4℃)した後、毎日3バイアルずつ取り出し、保管6日目まで生存細胞数を計数して細胞生存を確認した。その結果、CEFO−viveを使った場合、基本培地や生理食塩水とは異なり、保存6日目にも平均70%以上の細胞生存率を示した(図1、図2及び図3)。また、初代培養細胞であるヒト皮膚由来線維芽細胞(HDF)をCEFOgroTMHF培地で培養し、培養した後にトリプシンを処理して捕集した。捕集した細胞を上記実施例の細胞保存用組成物(CEFO−vive)、基本培地または生理食塩水にそれぞれ入れて冷蔵保管(4℃)した後、毎日3バイアルずつ取り出し、保管6日目まで生存細胞数を計数して細胞生存を確認した。その結果、CEFO−viveを使った場合、保存5日目にも平均90%以上の細胞生存率を示したが、基本培地や生理食塩水では保存2日目から細胞生存率が急激に減少することが確認できた(図4)。
UCMSCをCEFOgroTMUCMSCで培養した後にトリプシンを処理して細胞別にそれぞれ捕集し、上記実施例の細胞保存用組成物(CEFO−vive)、基本培地または生理食塩水に入れて冷蔵保管(4℃)した後、毎日3バイアルずつ取り出し、培養皿に接種してCEFOgroTMUCMSC培地で培養した。細胞培養24時間以後に顕微鏡を用いて細胞を観察した。その結果、CEFO−viveを使った場合、冷蔵保管5日目にも細胞再培養時細胞が培養皿によく付着されて培養されることが確認できたが、この他の基本培地または生理食塩水を用いた細胞の場合は、冷蔵保管2日目から細胞が培養皿に適応できずそのまま死滅することが確認できた(図5)。
UCMSCをCEFOgroTMUCMSCで培養した後にトリプシンを処理して細胞別にそれぞれ捕集し、上記実施例のCEFO−vive、基本培地または生理食塩水に入れて冷蔵保管(4℃)した後、毎日3バイアルずつ取り出し、培養皿に接種してCEFOgroTMUCMSC培地で4日間培養した。その後、それぞれの細胞を捕集し、間葉系幹細胞の細胞表面因子として知られているCDマーカー(CD31、CD73、CD105、CD146)の変化をフローサイトメーターを用いて確認した。しかし、CEFO−viveで保存した細胞を除いた基本培地または生理食塩水を用いた細胞の場合は、4日間培養時、分析に使用できるだけの細胞が得られなかった。よって、CEFO−viveで保存した細胞群でのみフローサイトメトリーを行った。その結果、1日目、2日目、3日目、4日目及び5日目にCD31(-)、CD73(+)、CD105(+)及びCD146(+)と現れ、CEFO−viveで幹細胞を冷蔵保管した場合、細胞の形態や細胞表面タンパク質の発現に変化がないことが確認できた(図6及び7、図8及び9、図10及び11、及び図12及び13)。
UCMSCをCEFOgroTMUCMSCで培養した後にトリプシンを処理して細胞別にそれぞれ捕集し、上記実施例のCEFO−vive、基本培地または生理食塩水に入れて常温保管 (25℃)した後、1日目または3日目に3バイアルずつ取り出し、培養皿に接種してCEFOgroTMUCMSC培地で4日間培養した。その後、それぞれの細胞を捕集し、間葉系幹細胞の細胞表面因子として知られているCDマーカー(CD31、CD73、CD105、CD146)の変化をフローサイトメーターを用いて確認した。しかし、常温保存の場合も、CEFO−viveで保存した細胞を除いた基本培地または生理食塩水を用いた細胞の場合は、4日間培養時、分析に使用できるだけの細胞が得られなかった。よって、CEFO−viveで保存した細胞群でのみフローサイトメトリーを行った結果、1日目及び3日目にCD31(-)、CD73(+)、CD105(+)及びCD146(+)と現れ、CEFO−viveで幹細胞を冷蔵保管した場合、細胞の形態や細胞表面タンパク質の発現に変化がないことが確認できた(図14、図15、図16及び図17)。
Claims (10)
- 植物由来組換えヒト血清アルブミン、または植物由来組換えヒト血清アルブミンおよび植物性ペプチドを有効成分として含有する細胞保存用組成物。
- 植物由来組換えヒト血清アルブミンを有効成分として含有し、総組成物100重量部に対して植物由来組換えヒト血清アルブミンを0.1重量部乃至20重量部含有することを特徴とする請求項1に記載の細胞保存用組成物。
- 植物由来組換えヒト血清アルブミン及び植物性ペプチドを有効成分として含有し、総組成物100重量部に対して植物由来組換えヒト血清アルブミンを0.1乃至10重量部及び植物性ペプチドを0.1重量部乃至10重量部含有することを特徴とする請求項1に記載の細胞保存用組成物。
- 上記細胞は、幹細胞または初代培養細胞であることを特徴とする請求項1に記載の細胞保存用組成物。
- 上記幹細胞は、臍帯由来間葉系幹細胞(Umbilical cord mesenchymal stem cell)、脂肪由来間葉系幹細胞(adipose derived mesenchymal stem cell)または骨髄由来間葉系幹細胞(Bone marrow-derived mesenchymal stem cell)であることを特徴とする請求項4に記載の細胞保存用組成物。
- ゼノフリー(xeno-free)及びアニマルフリー(animal-free)であることを特徴とする請求項1に記載の細胞保存用組成物。
- 上記植物由来組換えヒト血清アルブミンはイネ由来であり、植物性ペプチドは大豆由来であることを特徴とする請求項1に記載の細胞保存用組成物。
- 請求項1〜7のいずれか一項の細胞保存用組成物を細胞に処理する段階を含む細胞保存方法。
- 細胞保存用組成物を細胞に処理して30℃以下で保存する段階を含む請求項8に記載の細胞保存方法。
- 細胞保存用組成物を細胞に処理して0℃乃至10℃で保存する段階を含む請求項8に記載の細胞保存方法。
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