JP6867046B2 - マイクロポーラス状のヒドロゲル - Google Patents
マイクロポーラス状のヒドロゲル Download PDFInfo
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- JP6867046B2 JP6867046B2 JP2018509989A JP2018509989A JP6867046B2 JP 6867046 B2 JP6867046 B2 JP 6867046B2 JP 2018509989 A JP2018509989 A JP 2018509989A JP 2018509989 A JP2018509989 A JP 2018509989A JP 6867046 B2 JP6867046 B2 JP 6867046B2
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- hydrogel
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Description
a)ヒドロゲル形成材料の溶液を供す工程、
b)好ましくは相互接続された酸化亜鉛構成ネットワーク、好ましくは相互接続された酸化亜鉛のテトラポッド・ネットワークから成るものを有して成るテンプレート材料に対して、ヒドロゲル材料の所望の相互接続されたポーラス構造のネガティブ形態に対応する三次元形態を供す工程、
c)テンプレートにヒドロゲル形成材料の溶液をキャストする工程、
d)テンプレート材料の酸加水分解によって、ヒドロゲル材料からテンプレート材料を除去する工程を含んで成る。
もちろん、工程a)およびb)は、いずれの順で実施することができる。
アカントアメーバを、グテクンストら(Beilstein J Nanotechnol.2014,5,1393-1398)に従って培養した。端的に、アカントアメーバ・カステラーニ(A.castellanii、ATTC 30234)の栄養体(trophozoites)を、ペプトン・イースト・グルコース(Peptone Yeast Glucose (PYG))712培地(20.0gのプロテオース・ペプトン(proteose peptone)(BD、Sparks、USA)、1.00gのイースト・エキス(yeast extract)(BD、Sparks、USA)、950mLの蒸留されたH2O、10.0mLの0.40M MgSO4・7H2O(AppliChem、Darmstadt、Germany)、8.00mLの0.05M CaCl2(AppliChem、Darmstadt、Germany)、34.0mLの0.10Mクエン酸ナトリウム・2H2O(Merck,Darmstadt,Germany)、10.0mLの5.00mM Fe(NH4)2(SO4)2・6H20(AppliChem、Darmstadt、Germany)、10.0mLの0.25M Na2HPO4・7H2O(Roth、Karlsruhe、Germany)、10.0mLの0.25M KH2PO4(Roth、Karlsruhe、Germany)、50.0mLの2.00Mグルコース(Sigma-Aldrich Chemie GmbH,Steinheim,Germany))において室温で培養した。この純粋培養では、アカントアメーバ・カステラーニの栄養体の嚢胞形成(encystment)を避けるために、PYG 712培地を細胞培養フラスコ内で定期的に交換した。
酸化亜鉛のテトラポッド(t−ZnO)は、アデルンら(DE102010012385)、ミシュラら(Part Part Syst Char 2013,30,775-783; Kona 2014,30,92〜110)およびメクレンバーグら(Adv.Mater 2012,24,3486-3490)によって示されているように、フレーム・トランスポート合成で合成された。40μm〜400μmの範囲の直径寸法(一般的なアーム直径は500nm〜15μmの範囲の寸法)を有するこれらテトラポッド・ユニットを4体積%〜53体積%(一般に的には4体積%〜27体積%)の密度となるように、タブレットに圧縮した。再加熱(例えば、1100℃〜1200℃、5時間)後、t−ZnOを相互接続し、またタブレットをポリアクリルアミドの重合のテンプレートとして使用した。
相互接続されたt−ZnOタブレットをポリアクリルアミド重合のテンプレートとして使用した。アクリルアミド溶液(Bio-Rad、40%、1.00mL)、ビス溶液(Bio-Rad、2%、10.0μL〜250μL)および過硫酸アンモニウム溶液(Sigma-Aldrich、10%水溶液、30.0μL)の混合物を、小さなビーカーで5.00mLの容量まで充填し、またデシケーター(desiccator)中で20分間脱気した。この溶液をN、N、N’、N’−テトラメチルエチレンジアミン(TEMED、Bio-Rad、10.0μL)と混合し、また各々のt−ZnOタブレットの完全被覆のために計算された体積をタブレットに注いだ。重合の1時間後、基質を二重蒸留水(bidest.H20)で洗浄した。
ZnOテンプレートをHCl(0.5M〜1.0M、Sigma-Aldrich)で24時間〜120時間加水分解させた。加水分解後、pHが6よりも大きい値に達するまで、また完全に膨潤するまで、ヒドロゲルを二重蒸留水で洗浄した。70%エタノールでの消毒、およびPYG 712を伴う24時間滅菌条件下での洗浄は、アカントアメーバ・カステラーニとのインキュベーション(または低温放置、incubation)前に行った。調製した基質を48時間以内に使用した。ポリアクリルアミドに包埋されたt−ZnOタブレット(典型的な寸法:1mm〜3mm×11mm)の加水分解は、典型的にはpH4で2日〜4日かかる。マトリックスの生成および加水分解は、巨視的では図2に、および顕微鏡スケールでは図3に示される。
基質の剛性は、細胞の接着および分化を制御することができるため、多くの用途に関連する。膨張ならびにポリアクリルアミドの剛性および統合性(または完全性、integrity)へのHCl溶液の影響を試験するために、異なるヤング率となるように、表1に列挙するような、異なるモノマー対架橋剤比の試料を使用した。
(表1)アクリルアミド重合溶液
グテクンストら(Beilstein Journal of Nanotechnology 2014,5,1393-1398)に従うマイクロインデンテーション(microindentation)実験では、図3に示すように、1のように可能な限り低いpH値で24時間処理しても、ポリアクリルアミドの機械特性に有意な影響を及ぼさないことが判明した。
1時間〜5時間加水分解された、ポリアクリルアミドのマトリックスを、アデノシン3’、5’環状一リン酸塩溶液(cAMP、Sigma-Aldrich、0.01mM〜10.0mM)で洗浄し、次いでcAMP溶液中で3日〜4日間インキュベートした。この期間中、溶液を毎日交換した。
滅菌したポーラス状のヒドロゲル試料を、6ウェルプレート(6-well plate)において、アカントアメーバ・カステラーニ(ATTC 30234、30.000細胞/mL)とともにインキュベートした。0.5時間〜2時間後、位相差顕微鏡画像(Olympus、IX-81/BX-43)を撮影した。アカントアメーバは、30μm〜50μmの深さまで15分以内に化学的試薬を含有するマイクロポーラス状のヒドロゲル中へと移動した。図7に示すように、細胞は急速にトンネル形状のポアを通過して移動した。同様の効果がcAMPの非存在下で観察された(図6)。一般的に、細胞は終端に移動し、次いで回り回って、トンネル形状のポアを通ってアメーバ様式(manner)で大きな空洞に達するまで移動し続け、そこで細胞は何時間も留まった。
Claims (12)
- 相互接続されたトンネル形状のマイクロポアを有するポーラス状のヒドロゲルのマトリックスであって、
該マイクロポアは中空テトラポッド・ネットワークに対応する三次元形態を有し、
該トンネル形状のマイクロポアが、約500nm〜約15μmの平均トンネル径および約20μm〜約200μmの平均トンネル長さを有する、マトリックス。 - 前記マトリックスが、10よりも大きいトンネル長さ/トンネル径の比を有するトンネル形状のマイクロポアを有する、請求項1に記載のマトリックス。
- 前記マトリックスが、約4体積%〜約53体積%のトンネル密度を有する、請求項1または2に記載のマトリックス。
- 前記ヒドロゲルのマトリックスが、ポリアクリルアミド、ポリエチレングリコール、ポリ(N−イソプロピルアクリルアミド)、ポリ(2−ヒドロキシエチルメタクリレート)、ポリ(アクリル酸)およびそれらのコポリマーを含んで成る群から選択される材料を含んで成る、請求項1〜3のいずれかに記載のマトリックス。
- 前記マトリックスが、cAMPを含んで成る群から選択される走化性誘導物質を含んで成る、請求項1〜4のいずれかに記載のマトリックス。
- 前記マトリックスが、前記ヒドロゲル材料の前記相互接続されたポーラス構造のネガティブ形態に対応する三次元形態を有するテンプレート材料を有して成り、該テンプレート材料が相互接続された酸化亜鉛のテトラポッド・ネットワークを有して成る、請求項1〜5のいずれかに記載のマトリックス。
- 運動性細胞を捕捉するための使用であって、該運動性細胞が前記マトリックスの前記マイクロポアに移動する、請求項1〜5のいずれかに記載のマトリックスの使用。
- 溶液または溶液と接触している対象物からの運動性細胞を低減または排除する方法であって、請求項1〜5のいずれかに記載のマトリックスと該溶液を接触させることを含んで成る方法。
- 前記運動性細胞が、アカントアメーバ・カステラーニである、請求項7に記載の使用または請求項8に記載の方法。
- 前記溶液が、水、コンタクトレンズ洗浄溶液、コンタクトレンズ保存溶液、および細胞培養媒体を含んで成る群から選択される、請求項7もしくは9に記載の使用または請求項8もしくは9に記載の方法。
- コンタクトレンズを洗浄するための溶液および/またはコンタクトレンズを保存するための溶液ならびに請求項1〜5のいずれかに記載のマトリックスを含んで成る、コンタクトレンズを洗浄するためのキット。
- 請求項1〜5のいずれかに記載のポーラス状のヒドロゲルのマトリックスを形成する方法であって、
a)ヒドロゲル形成材料の溶液を供すこと、
b)ヒドロゲル材料の所望の相互接続されたポーラス構造のネガティブ形態に対応する三次元形態を有するテンプレート材料であって、相互接続された酸化亜鉛のテトラポッド・ネットワークを有して成る前記テンプレート材料を供すること、
c)前記テンプレートに前記ヒドロゲル形成材料の溶液をキャストすること、
d)前記テンプレート材料の酸加水分解によって、前記ヒドロゲル材料から該テンプレート材料を除去すること
を含んで成る、方法。
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