JP2023079206A - 尿由来間葉系幹細胞ミトコンドリアおよびその移植方法ならびに用途 - Google Patents
尿由来間葉系幹細胞ミトコンドリアおよびその移植方法ならびに用途 Download PDFInfo
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Abstract
Description
尿由来間葉系幹細胞ミトコンドリアは、以下の方法によって抽出され、
(1)尿液を容器に収集し、遠心分離して上澄み液を捨て、容器にPBS緩衝液を加えて再懸濁し、再び遠心分離して上澄み液を捨て、尿由来間葉系幹細胞分離培地を使用して細胞沈殿を再懸濁し、ゼラチンコート6穴プレートに接種し、培養箱に入れて初代培養し、細胞クローンが形成されたら液を全部交換し、クローンが大片に融合した後、トリプシンで消化し、消化後トリプシンを吸引して除去し、尿由来間葉系幹細胞増幅培地で再懸濁し、新しい6穴プレート内に接種し、P1世代として記録する(以後、継代や培養は同じである)。
またさらに、ステップ(1)において、細胞クローンの形成時間が7日間であり、クローンが大片に融合する時間が14日間である。
具体的に、4~6万個の尿由来間葉系幹細胞ミトコンドリアを成熟した卵細胞質に注入して、卵細胞の品質を改善する。
本実施例は、以下の方法によって尿由来間葉系幹細胞ミトコンドリアを抽出する。
本実施例は尿由来間葉系幹細胞ミトコンドリアの移植方法を提供する。この移植方法は、卵細胞質内単一精子マイクロインジェクション期間、精子と尿由来間葉系幹細胞ミトコンドリア(ミトコンドリア保存液でミトコンドリア沈殿を再懸濁して得られたミトコンドリア溶液微滴)を成熟した卵細胞に注入し、胚盤胞培養を実施して、卵細胞品質を改善し、受精率および胚品質、人間体外受精胚発育率を向上させる。
本実施例中の予後不良患者の成熟卵細胞のミトコンドリア生物活性と正常者の比較
共焦点顕微鏡で正常者と予後不良患者の成熟卵細胞ミトコンドリア活性を観察する。図1に示すように、ミトコンドリア膜電位指標であるテトラメチルローダミンエチルエステル、赤い蛍光はミトコンドリア活性の強さを表す。
フローサイトメトリーを用いて尿由来間葉系幹細胞の陽性発現間葉系幹細胞表面陽性マーカーCD29、CD73、CD90、CD13、CD44、SSEA-4、陰性発現CD45、CD34、CD31、HLA-DRなどの造血乾細胞および内皮細胞マーカーを検出し、その間葉系源が確認され、結果が図3に示される。図3から分かるように、本発明で分離した細胞は尿由来間葉系幹細胞である。
尿由来間葉系幹細胞ミトコンドリアを抽出した後、共焦点顕微鏡でミトコンドリア活性を観察し、結果が図4に示される。図4では、TMREはテトラメチルローダミンエチルエステルであり、つまりTMREをミトコンドリア膜電位指標として使用し、赤い蛍光はミトコンドリア活性の強さを表し、FCCPは酸化的リン酸化アンカプラーであり、左図は実施例3で得られた尿由来間葉系幹細胞ミトコンドリアにFCCPではなくTMREを添加したものであり、赤い蛍光強度は尿由来間葉系幹細胞ミトコンドリアが活性を有することを示し、右図はTMREとFCCPを添加して陰性対照とし、添加した後赤い蛍光が著しく減少し、ミトコンドリア活性が著しく低下することを示す。
試験組:3人患者の姉妹卵を実施例3の方法でICSIミトコンドリア注入体外授精を行った。
Claims (10)
- (1)尿液を容器に収集し、遠心分離して上澄み液を捨て、容器にPBS緩衝液を加えて再懸濁し、再び遠心分離して上澄み液を捨て、尿由来間葉系幹細胞分離培地を使用して細胞沈殿を再懸濁し、ゼラチンコート6穴プレートに接種し、培養箱に入れて初代培養し、細胞クローンが形成されたら液を全部交換し、クローンが大片に融合した後、トリプシンで消化し、消化後トリプシンを吸引して除去し、尿由来間葉系幹細胞増幅培地で再懸濁し、新しい6穴プレート内に接種し、P1世代として記録するステップと、
(2)ステップ(1)で得られたP1世代を培養箱に入れて培養を続け、6穴プレート内のP1世代が85~95%の面積になるとき、トリプシンで消化し、消化後トリプシンを吸引して除去し、尿由来間葉系幹細胞増幅培地で再懸濁し、遠心分離して上澄み液を捨て、細胞溶解液を加え、氷上溶解した後ミトコンドリア抽出液を加えて均一に混合し、遠心分離し、上澄み液を吸引し、別の容器に移し、再び遠心分離して上澄み液を捨て、沈殿物をミトコンドリアとするステップと、
(3)再び遠心分離、洗浄、上澄み液捨てを繰り返し、ミトコンドリア保存液でミトコンドリア沈殿を再懸濁し、0~4℃で保存するステップと、を含む方法によって抽出される、ことを特徴とする尿由来間葉系幹細胞ミトコンドリア。 - ステップ(1)において、前記遠心分離はいずれも1200rpmで10分間行われ、細胞クローンの形成時間が7日間であり、クローンが大片に融合する時間が14日間である、ことを特徴とする請求項1に記載の尿由来間葉系幹細胞ミトコンドリア。
- ステップ(1)において、ゼラチンの濃度が0.1%ゼラチン水溶液であり、ステップ(1)および(2)において、前記培養箱はいずれも37℃、5% CO2培養箱であり、前記トリプシンは0.05%トリプシン水溶液であり、消化時間はいずれも1分間である、ことを特徴とする請求項1に記載の尿由来間葉系幹細胞ミトコンドリア。
- ステップ(2)において、前記溶解時間が5分間であり、トリプシン消化後過剰のトリプシンを吸引し、各穴に1mLの尿由来間葉系幹細胞増幅培地を加えて再懸濁し、遠心分離管に移して、1200rpmで3分間遠心分離し、上澄み液を捨て、500μlの細胞溶解液を加え、氷上で5分間溶解した後、1mlのミトコンドリア抽出液を加えて均一に混合する、ことを特徴とする請求項1に記載の尿由来間葉系幹細胞ミトコンドリア。
- ステップ(2)において、1mlのミトコンドリア抽出液を加え、均一に混合し、800gで10分間遠心分離し、上澄み液を吸引し、別の遠心分離管内に移し、再び5000gで10分間遠心分離し、上澄み液を捨て、沈殿物をミトコンドリアとする、ことを特徴とする請求項1に記載の尿由来間葉系幹細胞ミトコンドリア。
- 請求項1~5のいずれか1項に記載の尿由来間葉系幹細胞ミトコンドリアの移植方法であって、前記移植方法は、卵細胞質内単一精子マイクロインジェクション期間、精子と尿由来間葉系幹細胞ミトコンドリアを成熟した卵細胞に注入するステップを含み、好ましくは、前記尿由来間葉系幹細胞ミトコンドリアは自己尿由来間葉系幹細胞ミトコンドリアである、ことを特徴とする尿由来間葉系幹細胞ミトコンドリア移植方法。
- 前記の移植方法は、微細操作針で精子を掴んで制動し、精子を注入針の先端に動かし、尿由来間葉系幹細胞ミトコンドリアの微小液滴に移し、数回吸引してホモジネートを形成した後、尿由来間葉系幹細胞ミトコンドリア液滴と先に掴んで制動した精子を成熟した卵細胞質に注入することを含む、ことを特徴とする請求項6に記載の尿由来間葉系幹細胞ミトコンドリアの移植方法。
- 前記移植方法は、マイクロ操作台下で、内径4.5μmの微細操作針を選択し、精子を掴んで制動し、精子を注入針の先端に動かし、ミトコンドリアの微小液滴に移し、数回吸引してホモジネートを形成し、注入針で前記尿由来間葉系幹細胞ミトコンドリア液滴を吸引し、注入針の前端10μm体積長の4~6万個のミトコンドリアと単一精子を成熟した卵細胞質に注入することを含む、ことを特徴とする請求項7に記載の尿由来間葉系幹細胞ミトコンドリアの移植方法。
- 請求項1~5のいずれか1項に記載の尿由来間葉系幹細胞ミトコンドリアの卵細胞品質改善剤における用途。
- 請求項1~5のいずれか1項に記載の尿由来間葉系幹細胞ミトコンドリアを含有することを特徴とする卵細胞品質改善剤。
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