JP6711424B2 - 細胞培養用ゲル組成物およびその製造方法、細胞培養方法ならびに細胞培養用基板 - Google Patents
細胞培養用ゲル組成物およびその製造方法、細胞培養方法ならびに細胞培養用基板 Download PDFInfo
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Description
本発明のゲル組成物は、親水性ブロック鎖と疎水性ブロック鎖とを有する両親媒性ブロックポリマーを主要構成要素とする組成物である。親水性ブロック鎖のモノマー単位としては、アルキレンオキシドやサルコシン等が挙げられる。疎水性ブロック鎖のモノマー単位としては、グリコール酸、乳酸、ヒドロキシイソ酪酸等のヒドロキシ酸や、グリシン、アラニン、バリン、ロイシン、イソロイシン、プロリン、メチオニン、チロシン、トリプトファン、グルタミン酸メチル、グルタミン酸ベンジル、アスパラギン酸メチル、アスパラギン酸エチル、アスパラギン酸ベンジル等の疎水性アミノ酸あるいはアミノ酸誘導体が挙げられる。
疎水性ブロック鎖は、10個以上の乳酸単位を含むことが好ましい。ポリ乳酸は、優れた生体適合性および安定性を有する。また、ポリ乳酸は、優れた生分解性を有することから、代謝が早く、生体内での集積性が低い。そのため、ポリ乳酸を構成ブロックとする両親媒性ポリマーは、生体、特に人体への応用において有用である。また、ポリ乳酸は結晶性であるため、疎水性ブロック鎖が短い場合でも、アルコール等の溶媒中で疎水性ブロック鎖が凝集し、物理ゲルが形成されやすい。
親水性ブロック鎖は、20個以上のサルコシン単位(N−メチルグリシン単位)を含むことが好ましい。サルコシンは、水溶性が高い。また、ポリサルコシンはN置換アミドを有することからシス−トランス異性化が可能であり、かつ、α炭素まわりの立体障害が少ないことから、高い柔軟性を有する。そのため、ポリサルコシン鎖を構成単位として用いることにより、高い親水性と柔軟性とを併せ持つ親水性ブロック鎖が形成される。
両親媒性ポリマーは、親水性ブロック鎖と疎水性ブロック鎖とを結合させたものである。親水性ブロック鎖と疎水性ブロック鎖とは、リンカーを介して結合していてもよい。リンカーとしては、疎水性ブロック鎖の構成単位である乳酸モノマー(乳酸やラクチド)またはポリ乳酸鎖と結合可能な官能基(例えば、水酸基、アミノ基等)と、親水性ブロックの構成単位であるサルコシンモノマー(例えばサルコシンやN−カルボキシサルコシン無水物)またはポリサルコシンと結合可能な官能基(例えばアミノ基)とを有するものが好ましく用いられる。リンカーを適宜に選択することにより、親水性ブロック鎖や疎水性ブロック鎖の分枝構造を制御することができる。
上記の両親媒性ポリマーを、溶媒と混合することによりゲルが得られる。安定性の高いゲルを形成するためには、両親媒性ポリマーと有機溶媒を混合してオルガノゲルを作製し、オルガノゲルから溶媒を除去して実質的に溶媒を含まないキセロゲルを作製することが好ましい。キセロゲルに水または水溶液を混合することにより、細胞培養に適したヒドロゲルが得られる。
本発明の細胞培養用ゲル組成物は、各種の細胞の培養に用いられる。本発明の細胞培養方法では、ヒドロゲル中に培養対象となる細胞を内包させた状態で細胞培養が行われる。ヒドロゲルに細胞を内包させる方法としては、ヒドロゲルに細胞懸濁液等の培養対象細胞を含む溶液を注入する方法が挙げられる。前述のように、キセロゲルと細胞懸濁液等の細胞を含む水溶液を混合して、細胞を内包するヒドロゲルを形成してもよい。この方法は、ヒドロゲル中に細胞を注入する作業を必要とせず、作業性に優れる。また、ヒドロゲル中に細胞を均一に分散させることが可能である。
WO2009/148121号に記載の方法を参照して、サルコシン無水物およびアミノ化ポリL−乳酸をモノマー成分として、グリコール酸、O‐(ベンゾトリアゾル‐1‐イル)‐N,N,N’,N’‐テトラメチルウロニウムヘキサフルオロリン酸塩(HATU)およびN,N‐ジイソプロピルエチルアミン(DIEA)を用いて、サルコシン単位108個からなる親水性ブロックとL‐乳酸単位32個からなる疎水性ブロックとを有する直鎖状の両親媒性ブロックポリマー(PLA32−PSar108)を合成した。
実験例1では、上記のゲル物質を培養基材としてHepG2細胞の培養を行い、培養細胞の観察および遺伝子発現量の定量を行った。
上記で得られたウェル上のキセロゲルに,1ウェルにつき2.5×104個/500μLのHepG2細胞懸濁液を添加したところ、ゲルが吸水して半透明のヒドロゲルが得られた。比較対象として、自己組織化ペプチドを構成成分とするヒドロゲル(3Dマトリックス社 「PuraMatrix」)を1ウェルに250μLロードし、1ウェルにつき2.5×104個/500μLのHepG2細胞懸濁液を添加した。
実験例1‐1と同様に、ウェル上に両親媒性ポリマーのキセロゲルを作製し、HepG2細胞懸濁液を添加した後、37℃,5%CO2環境下で培養し、2日後および7日後に、倒立型顕微鏡による観察を行った。比較対象として、動物由来のECMをベースとするヒドロゲル(コーニング社「Matrigel」の10倍希釈液)を1ウェルに250μLロードし、その上にHepG2細胞懸濁液を添加したもの、およびポリスチレン製の平面培養基板上にHepG2細胞懸濁液を添加したものを同条件にて培養し、倒立顕微鏡による観察を行った。
実験例1‐2と同様に、両親媒性ポリマー(PSar-PLLA)のゲル、Matrigelおよび平面培養基板で2日間の培養を行った後、実験例1‐1と同様にしてQIAGEN RNeasy KitによりRNAを回収した。以下の手順により、回収したRNA中のCYP3A4をコードするmRNAの発現量を調べた。回収したRNAから50ngを採取し、cDNA Reverse Transcription Kit(サーモフィッシャーサイエンティフック社)により逆転写を行い、cDNAを調製した。CYP3A4のcDNAを特異的に増幅するプライマーとCYP3A4遺伝子に特異的に結合するプローブを用いて、TaqManPCR法によりリアルタイムPCRを実施した。内部コントロールとして、GAPDHの遺伝子発現量を求め、GAPDHのmRNA発現量に対するCYP3A4のmRNA発現量の相対値を求めた。両親媒性ポリマー(PSar-PLLA)のゲル、Matrigelおよび平面培養基板のそれぞれについてN=3での平均を求めた。結果を図3に示す。
実験例2では、HepG2細胞に代えて、肝臓特異的機能発現モデルとしてより生体に近いヒト由来の初代培養肝細胞を培養対象として、上記の実験例1−2および1−3と同様の実験を行った。
Claims (13)
- 親水性ブロック鎖と疎水性ブロック鎖とを有する両親媒性ブロックポリマーを含有し、
前記両親媒性ブロックポリマーは、前記親水性ブロックが20個以上のサルコシン単位を有し、前記疎水性ブロック鎖が10個以上の乳酸単位を有する、細胞培養用ゲル組成物。 - 実質的に分散媒を含有しないキセロゲルである、請求項1に記載の細胞培養用ゲル組成物。
- 分散媒として水を含むヒドロゲルである、請求項1に記載の細胞培養用ゲル組成物。
- 前記両親媒性ブロックポリマーを10重量%以上含有する、請求項3に記載の細胞培養用ゲル組成物。
- 親水性ブロック鎖と疎水性ブロック鎖とを有する両親媒性ブロックポリマーを有機溶媒と混合することによりオルガノゲルを調製し、
前記オルガノゲルから有機溶媒を除去することによりキセロゲルを形成し、
前記両親媒性ブロックポリマーは、前記親水性ブロックが20個以上のサルコシン単位を有し、前記疎水性ブロック鎖が10個以上の乳酸単位を有する、
細胞培養用ゲル組成物の製造方法。 - 前記有機溶媒が炭素数1〜6のアルコールを含む、請求項5に記載の細胞培養用ゲル組成物の製造方法。
- 細胞培養用基板上で前記オルガノゲルから有機溶媒を除去することにより、細胞培養用基板上に前記キセロゲルを形成する、請求項5に記載の細胞培養用ゲル組成物の製造方法。
- 請求項5〜7のいずれか1項に記載の方法によりキセロゲルを形成し、前記キセロゲルと水または水溶液とを混合することによりヒドロゲルを形成する、細胞培養用ゲル組成物の製造方法。
- 前記水溶液が培養対象の細胞を含み、前記キセロゲルと前記水溶液とを混合することにより細胞を内包するヒドロゲルを形成する、請求項8に記載の細胞培養用ゲル組成物の製造方法。
- 請求項3に記載のゲル組成物中で細胞を培養する、細胞培養方法。
- 請求項10に記載の方法により細胞を培養後、細胞を内包するヒドロゲルに水または水溶液を加えることによりゲルを溶解し、培養後の細胞を回収する、細胞培養方法。
- 基板上に請求項2に記載のキセロゲルを備える細胞培養用基板。
- 前記基板上に前記キセロゲルが固着している、請求項12に記載の細胞培養用基板。
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