JP6715330B2 - 細胞の立体構造化方法及び立体構造化システム - Google Patents
細胞の立体構造化方法及び立体構造化システム Download PDFInfo
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Description
細胞のうち足場依存性細胞は、培養液中で浮いている状態では死滅するため、足場に付着させて増殖させる必要がある。皮膚や骨などの細胞は、培養時に足場を求めて互いに接着し合い、細胞と細胞自身が算出する細胞外基質により凝集体である細胞塊(スフェロイド)を形成する。細胞塊は、細胞が集積した直径100〜400〔μm〕程度の球状凝集塊であり、細胞塊同士も接着して融合するとさらに大きな形状となる。
(2−1)実施形態1における細胞培養システムの全体構成
図1に示すように、実施形態1による細胞培養システム1、立体培養モジュール2の上流段に培養容器3、下流段に回収容器4が接続され、制御部5による統括制御下において、培養容器3から供給される成長因子(NGF)や栄養因子を含む培養液6を、一定の培養環境条件を維持しながら立体培養モジュール2に対して灌流させるようになされている。
図2(A)及び(B)に示すように、立体培養モジュール2は、培養液6の供給路に接続される開口端20Aから内壁面20Bで囲まれる空間を流路とするシリンダ(筒体部)20を有し、当該シリンダ20の内壁面20Bには流路方向に沿って複数の溝部20Cが形成されている。
図4に実施形態1による細胞培養システム1の動作例を表すフローチャートを示す。まず立体培養モジュール2について、貫通保持プレート23及び平面プレート22の間に固定保持された複数のホローファイバ21をシリンダ20の内部空間(流路上)に収容しておく。
(3−1)実施形態2における細胞培養システムの全体構成
実施形態2においては、細胞塊を比較的容易に形成するため、マウス筋芽細胞
を利用する。C2C12細胞は、分化の際に筋繊維を形成する天然の融合能を有するため、分化誘導に先立って互いに付着し合うことが期待される。
本発明による細胞培養システム100においては、立体培養モジュール101を密閉構造にしてコンタミネーションを防止するのみならず、容易かつ迅速な分解を可能にして細胞塊を取り出し得る構造に形成されている。コンタミネーションを防止するためには、立体培養モジュール101内の流路空間を密閉構造にすることが望ましいが、例えばエポキシ樹脂を用いてホローファイバを含む流路空間を完全密封した場合には、培養後の細胞塊を取り出すためには、モジュール自体を切断しなければならない。
図13に実施形態2による細胞培養システム100の動作例を表すフローチャートを示す。まず立体培養モジュール101について、2枚の固定プレート131,132の間に固定保持された複数のホローファイバ130をハウジング120の流路空間部121に収容しておく。
細胞培養システム100においては、まず細胞培養を行う前段階として、安全に細胞に適用できるか検証するため、培養液を連続的に循環させた際のコンタミネーションの有無を確認する。
本実施形態1においては、立体培養モジュール2として、線状からなる複数のホローファイバ21の外表面21Aに平面プレート22を成長起点として細胞塊群を成長に伴い3次元方向に結合させて略円柱形状の立体構造体を形成する場合について述べたが、本発明はこれに限らず、所望の立体形状に合わせて複数のホローファイバの形状及び湾曲状態など自由に設計するようにしても良い。
Claims (16)
- 培養液の供給口から排出口まで内壁面で囲まれる空間を流路とする流路空間部内に、複数のファイバを相互に所定間隔を保ちながらそれぞれ長手方向が当該流路方向に沿うように位置決めしておき、
前記供給口から前記流路内に供給される前記培養液の液流にのせて、複数の細胞塊を当該流路内に投入し、当該各細胞塊を前記排出口の近傍を成長起点として前記各ファイバの外表面に集積しながら培養させる
ことを特徴とする細胞の立体的培養方法。 - 前記各ファイバは、中空又は長手方向に沿って側溝が形成されており、前記外表面から前記中空内部又は前記側溝内部に連通する複数の微細孔を有し、当該各微細孔を通じて前記各細胞塊からの代謝老廃物を除去する
ことを特徴とする請求項1に記載の細胞の立体的培養方法。 - 前記各ファイバは、前記各微細孔を通じて前記各細胞塊に対して成長因子および栄養因子のいずれか一方または両方を供給する
ことを特徴とする請求項2に記載の細胞の立体的培養方法。 - 前記培養液の流速度を制御するとともに、当該培養液の制御状態に合わせて前記流路内に投入する前記細胞塊の数および投入タイミングを調整する
ことを特徴とする請求項1乃至3のいずれか一項に記載の細胞の立体的培養方法。 - 前記培養液の温度、二酸化炭素濃度、酸素濃度及び窒素濃度の少なくとも1以上を制御する
ことを特徴とする請求項1乃至4のいずれか一項に記載の細胞の立体的培養方法。 - 前記各細胞塊の成長過程に合わせた所定タイミングで、前記各ファイバに対して流路方向に沿った微細な振動を付与する
ことを特徴とする請求項1乃至5のいずれか一項に記載の細胞の立体的培養方法。 - 培養液の供給口から排出口まで内壁面で囲まれる空間を流路とする流路空間部と、
相互に所定間隔を保ちながらそれぞれ長手方向が当該流路方向に沿うように位置決めされている複数のファイバと、
前記流路空間部の前記供給口から前記培養液を前記流路内に供給する液供給部と
を備え、前記液供給部による前記培養液の液流にのせて複数の細胞塊が前記流路内に投入されながら、当該各細胞塊を前記排出口の近傍を成長起点として前記各ファイバの外表面に集積しながら培養させる
ことを特徴とする細胞の立体的培養システム。 - 前記流路空間部は、
いずれか一方または両方の対向面に所定形状の溝が形成された第1ケースおよび第2ケースを、当該溝を取り囲むように環状のシール材を介在させて接合することにより、当該シール材の環内で形成される密閉空間からなる
ことを特徴とする請求項7に記載の細胞の立体的培養システム。 - 前記各ファイバは、
前記流路空間部における前記供給口側が閉塞され、かつ、前記排出口側が開口されている
ことを特徴とする請求項8に記載の細胞の立体的培養システム。 - 前記各ファイバは、
前記閉塞側と前記開口側との間に張力が加わるように前記流路空間部において支持される
ことを特徴とする請求項8又は9に記載の細胞の立体的培養システム。 - 前記各ファイバは、中空又は長手方向に沿って側溝が形成されており、前記外表面から前記中空内部又は前記側溝内部に連通する複数の微細孔を有し、当該各微細孔を通じて前記各細胞塊からの代謝老廃物を除去する
ことを特徴とする請求項7乃至10のいずれか一項に記載の細胞の立体的培養システム。 - 前記各ファイバは、前記各微細孔を通じて前記各細胞塊に対して成長因子および栄養因子のいずれか一方または両方を供給する
ことを特徴とする請求項7乃至10のいずれか一項に記載の細胞の立体的培養システム。 - 前記培養液の流速度を制御する制御部をさらに備える
ことを特徴とする請求項7乃至12のいずれか一項に記載の細胞の立体的培養システム。 - 前記制御部は、前記培養液の温度、二酸化炭素濃度、酸素濃度及び窒素濃度のうち少なくとも1以上を制御する
ことを特徴とする請求項13に記載の立体的培養システム。 - 前記制御部による前記培養液の制御状態に合わせて前記流路内に投入する前記細胞塊の数および投入タイミングを調整する細胞投入調整部をさらに備える
ことを特徴とする請求項13又は14に記載の立体的培養システム。 - 前記制御部の制御下にて、前記各細胞塊の成長過程に合わせた所定タイミングで、前記各ファイバに対して流路方向又は逆方向に沿って交互に微細な振動を付与する振動付与部をさらに備える
ことを特徴とする請求項13乃至15のいずれか一項に記載の細胞の立体的培養システム。
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