JP2023123578A - 脂肪組織製品および製造方法 - Google Patents
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Abstract
Description
脂肪組織マトリックス材料を製造するために、ブタ脂肪組織を最初に2インチのストリップにスライスし、食品グレードのミートチョッパで粗く細断した。細断した脂肪組織は、さらに処理する準備ができていない場合は、-80℃で凍結するようにしてもよい。凍結材料は、一晩で室温または4℃で解凍することができる。前処理した材料は、RETSCH(登録商標)GM300(GRINDOMIX)により2000rpmで粗粉砕し、その後、4000rpmでさらに粉砕して、固体マトリックスからオイルの相分離を行った。脂肪マトリックス固形分を遠心分離により採取し、緩衝液で洗浄した。マトリックス材料を、室温で一晩、EDTA-Triton溶液で脱細胞化し、4時間毎に溶液を交換した。マトリックスタンパク質を再び洗浄した。洗浄中、マトリックスペレットを遠心分離して組織マトリックスをペレット化し、使用済み溶液をデカントした。懸濁液を再び機械的に粉砕して、マトリックス繊維をさらに分解した。洗浄後、マトリックスペレットを、約2~3%w/wの固形分濃度で20%のPBSに再懸濁した。スラリーを金属トレイに入れ、凍結乾燥してスポンジを形成し、DHT処理を行って材料を安定化させた。その後、安定化させたスポンジを粉砕して、篩にかけ、流動性/注入可能なブタ無細胞組織スラリー(PATS)材料として所望のサイズの粒子を得た。粒子状物質は、5~15%のペーストになり、電子ビームによる最終滅菌を受けた。
上記プロセスで製造した組織製品を、走査型電子顕微鏡(SEM)および原子間力顕微鏡(AFM)による分析にかけた。その結果は、組織製品が、図6に示すように、構造、多孔性などを含む典型的なコラーゲンバンディングパターンを有するコラーゲン材料を含む多孔性足場であることを示していた。顕微鏡は、正常なバンディングパターンを持つ無傷のコラーゲンを示している。
説明したように製造したサンプルは、図8Aに示すように、ヘマトキシリンおよびエオシン染色(「H&E」)を受け、図8Bに示すように、DNAおよび脂質含量分析を受け、(組織マトリックス対天然脂肪対照を示す)図8Cに示すように、MHCIおよびII成分の免疫染色を受けた。H&E組織学では、組織製品が細胞の兆候のない多孔質構造を示した。この観察結果と一致して、組織製品の残留DNAと遊離オイルは非常に少なくなっていた。免疫染色により、組織製品はMHC-1およびII染色の効果がなく、記載のプロセスが脱細胞化に効率的であることを示している。
組織を、I型、III型およびIV型を含む主要な細胞外マトリックスタンパク質の免疫組織学的分析にかけた。図9を参照すると、脂肪組織製品(下段)は、天然脂肪マトリックス(上段)の元の特性を保持していた。
組織製品スポンジが脂肪組織、脈管構造、および真皮組織のような他の結合組織の成長を支援する潜在能力があるかどうかを試験するために、3つの異なる細胞タイプを選択した。具体的には、脂肪生成間葉系幹細胞、内皮細胞および真皮線維芽細胞など、正常なヒト個体から単離した一次細胞をすべて試験した。それら組織から単離した細胞を組織製品に播種し、1、7、16日間培養した。細胞増殖は、細胞増殖アッセイキットで定量化した。CyQUANT(登録商標)Cell Proliferation Assay Kitを使用して、蛍光色素によりDNA含有量で細胞増殖を定量化した。組織製品を細胞増殖について分析した。図10に示すように、細胞播種足場が生死染色液で染色され、蛍光顕微鏡下で細胞の生存率と成長が観察された。組織製品は、インビトロで3種類すべての細胞増殖を支援する。
製品の生物学的性能を、皮下ヌードラットモデルで試験した。図11に示すように、この研究は製品の様々な配合を試験するために設計した。
図15は、1.5年間保存された組織マトリックスと比較した、新鮮な脂肪組織マトリックスの画像を提供しており、両方とも実施例Aに記載されるように調製されたものである。それら画像は様々な倍率で提供されている。図示のように、10%の固形物を含む湿潤構成の脂肪組織マトリックス材料は、1.5年間の保存後に凝集体を形成した。生物学的試験は、凝集がヌードラットの皮下領域における体積保持や脂肪組織の内殖などの材料の生物学的性能に影響を与えないことを示している。しかしながら、臨床環境での非侵襲的送達の場合、10%の脂肪組織製品には注入性を促進するために担体が必要になることがある。
Claims (31)
- 組織製品の製造方法であって、
脂肪組織を選択するステップと、
脂肪組織を機械的に処理して、組織のサイズを小さくするステップと、
機械的に処理した組織を処理して、組織から実質的にすべての細胞物質を除去するステップと、
組織を溶液に懸濁して懸濁液を形成するステップと、
懸濁液を処理して、微多孔質構造を有する安定化した三次元構造を生成するステップと、
安定化した三次元構造を機械的に処理して粒子を生成するステップとを含むことを特徴とする方法。 - 請求項1に記載の方法において、
懸濁液を処理して安定化した三次元構造を生成することには、懸濁液を乾燥させることが含まれることを特徴とする方法。 - 請求項2に記載の方法において、
乾燥が凍結乾燥を含むことを特徴とする方法。 - 請求項1乃至3の何れか一項に記載の方法において、
懸濁液を処理して安定化した三次元構造を生成することには、組織を架橋することが含まれることを特徴とする方法。 - 請求項4に記載の方法において、
架橋が、化学物質、光活性化架橋プロセスまたは加熱のうちの少なくとも1つによる処理を含むことを特徴とする方法。 - 請求項5に記載の方法において、
化学物質が、グルタルアルデヒド、ジェネピン、カルボジイミドおよびジイソシアネートのうちの少なくとも1つを含むことを特徴とする方法。 - 請求項4に記載の方法において、
架橋が、組織を加熱することを含むことを特徴とする方法。 - 請求項7に記載の方法において、
組織が真空中で加熱されることを特徴とする方法。 - 請求項4または7に記載の方法において、
組織が70℃~120℃に加熱されることを特徴とする方法。 - 請求項1に記載の方法において、
安定化した三次元構造が、水性環境と接触しているときにその微多孔質構造を維持することを特徴とする方法。 - 請求項10に記載の方法において、
物質が、体内に埋め込まれたときに、安定した三次元構造を維持することを特徴とする方法。 - 請求項1乃至11の何れか一項に記載の方法において、
安定化した三次元構造を機械的に処理して粒子を生成することには、50ミクロン~4mmの最長寸法を含む粒子群を生成することが含まれることを特徴とする方法。 - 請求項1乃至11の何れか一項に記載の方法において、
安定化した三次元構造を機械的に処理して粒子を生成することには、1.5mm~4mmの最長寸法を含む粒子群を生成することが含まれることを特徴とする方法。 - 請求項1乃至11の何れか一項に記載の方法において、
安定化した三次元構造を機械的に処理して粒子を生成することには、2mm~3.5mmの最長寸法を含む粒子群を生成することが含まれることを特徴とする方法。 - 請求項1乃至11の何れか一項に記載の方法において、
安定化した三次元構造を機械的に処理して粒子を生成することには、2mm~3mmの最長寸法を含む粒子群を生成することが含まれることを特徴とする方法。 - 請求項1乃至15の何れか一項に記載の方法において、
安定化した三次元構造を機械的に処理して粒子を生成することには、安定化した三次元構造から保持された微多孔質構造を有する粒子群を生成することが含まれることを特徴とする方法。 - 請求項1乃至16の何れか一項に記載の方法において、
粒子を水和するステップをさらに含むことを特徴とする方法。 - 請求項17に記載の方法において、
粒子を水和することには、粒子と水溶液によって粒子が5重量%~20重量%の組成物が形成されるように、粒子を所定量の水溶液と混合することが含まれることを特徴とする方法。 - 請求項18に記載の方法において、
粒子を水和することには、粒子と水溶液によって粒子が5重量%~12重量%の組成物が形成されるように、粒子を所定量の水溶液と混合することが含まれることを特徴とする方法。 - 請求項1乃至19の何れか一項に記載の方法により製造された組織製品。
- 組織製品組成物であって、
粒子状組織マトリックスを含み、組織製品組成物が、多孔質スポンジに形成された後に粒子状に形成された脂肪無細胞組織マトリックスを含み、粒子状組織マトリックスが、約0.05mm~3mmの最長寸法を有する粒子を含むことを特徴とする組織製品組成物。 - 請求項21に記載の組織製品組成物において、
粒子が、多孔質スポンジに由来する微多孔質構造を含むことを特徴とする組織製品組成物。 - 請求項21または22に記載の組織製品組成物において、
粒子が乾燥していることを特徴とする組織製品組成物。 - 請求項21または22に記載の組織製品組成物において、
流動性担体をさらに含むことを特徴とする組織製品組成物。 - 請求項24に記載の組織製品組成物において、
流動性担体が水性流体を含むことを特徴とする組織製品組成物。 - 請求項25に記載の組織製品組成物において、
流動性担体が生理食塩水を含むことを特徴とする組織製品組成物。 - 請求項25または26に記載の組織製品組成物において、
組成物が80~95重量%の水を含むことを特徴とする組織製品組成物。 - 請求項25または26に記載の組織製品組成物において、
組成物が、5重量%~15重量%の脂肪組織マトリックスタンパク質を含むことを特徴とする組織製品組成物。 - 請求項24乃至26の何れか一項に記載の組織製品組成物において、
流動性担体が流動性ヒアルロン酸担体であることを特徴とする組織製品組成物。 - 請求項29に記載の組織製品組成物において、
ヒアルロン酸が架橋されていないことを特徴とする組織製品組成物。 - 請求項29に記載の組織製品組成物において、
ヒアルロン酸が架橋されていることを特徴とする組織製品組成物。
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US20250065018A1 (en) | 2025-02-27 |
US10821205B2 (en) | 2020-11-03 |
CN111201046B (zh) | 2022-06-28 |
CN115252910A (zh) | 2022-11-01 |
US20210038767A1 (en) | 2021-02-11 |
JP7559144B2 (ja) | 2024-10-01 |
WO2019079570A1 (en) | 2019-04-25 |
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JP2025011092A (ja) | 2025-01-23 |
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