JP5270617B2 - ブロックコポリマを含む薬物送達構成体及び医療器具 - Google Patents
ブロックコポリマを含む薬物送達構成体及び医療器具 Download PDFInfo
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- JP5270617B2 JP5270617B2 JP2010136238A JP2010136238A JP5270617B2 JP 5270617 B2 JP5270617 B2 JP 5270617B2 JP 2010136238 A JP2010136238 A JP 2010136238A JP 2010136238 A JP2010136238 A JP 2010136238A JP 5270617 B2 JP5270617 B2 JP 5270617B2
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- VKWSJIFSYYXOGC-ALNMCBPKSA-N CN[C@@H](C[C@@H]([n]1c2c(c3c4CNC3O)c3c1cccc3)O[C@@H]1[n]3c2c4c2ccccc32)[C@@H]1OC Chemical compound CN[C@@H](C[C@@H]([n]1c2c(c3c4CNC3O)c3c1cccc3)O[C@@H]1[n]3c2c4c2ccccc32)[C@@H]1OC VKWSJIFSYYXOGC-ALNMCBPKSA-N 0.000 description 1
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
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Description
(a)BAB又はABA(直鎖状3元ブロック)
(b)B(AB)n又はA(BA)n(直鎖状交互ブロック)
(c)X−(AB)n又はX−(BA)n(2元ブロック、3元ブロック、及び他の放射状ブロックコポリマを含む)
ここで、Aはエラストマブロックを表し、Bは熱可塑性ブロックを表し、nは正の自然数を表し、Xは開始シード分子を表す。
スチレン誘導体(例えば、α−メチルスチレン、環状アルキル化スチレン、環状ハロゲン化スチレン、又はこれらの混合物、又は(b)メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ヒドロキシエチル、又はこれらの混合物である。
・上述の溶媒系
・例えばイソブチレン等のオレフィンモノマ
・開始剤(イニファ又はシード分子)。例えば、tert−エステル、tert−エーテル、tert−ヒドロキシル、tert−ハロゲンを含む化合物、及び、より一般的には、炭化水素酸のクミル(cumyl)エステル、アルキルクミルエーテル、クミルハロゲン化物及びクミルヒドロキシル化合物、並びにこれらの化合物の干渉された(hindered)バージョン
例えばジメチルアセタミド、ジメチルスルホキシド、ジメチルフタレート等の電子対供与体を溶媒系に添加してもよい。更に、2,6−ジ−tert−ブチルピリジン、4−メチル−2,6−ジ−tert−ブチルピリジン、1,8−ビス(ジメチルアミノ)−ナフタレン、ジイソプロピルエチルアミン等、水を捕捉するプロトンスカベンジャを添加してもよい。
・ヘパリン、ヘパリン誘導体、ウロキナーゼ、PPack(デキストロフェニルアラニン・プロリン・アルギニン・クロロメチルケトン)等の抗血栓薬
・デキサメタゾン、プレドニソロン、コルチコステロン、ブデソニド、エストロゲン、スルファサラジン、メサラミン等の抗炎症薬
・パクリタキセル、5−フルオロウラシル、シスプラチン、ビンブラスチン、ビンクリスチン、エポチロン、エンドスタチン、アンギオスタチン、アンギオペプチン、平滑筋細胞増殖を抑制するモノクローナル抗体、チミジンキナーゼ阻害薬等の抗新生/抗増殖/抗縮瞳薬
・リドカイン、ブピバカイン、ロピバカイン等の麻酔薬
・D−Phe−Pro−Argクロロメチルケトン、RGDペプチド含有化合物、ヘパリン、ヒルジン、抗トロンビン化合物、血小板受容体拮抗薬、抗トロンビン抗体、抗血小板受容体抗体、アスピリン、プロスタグランジン阻害薬、血小板阻害薬、ダニ(tick)由来抗血小板ペプチド等の抗凝血薬
・増殖因子、転写アクチベータ、転写プロモータ等の血管細胞増殖促進薬
・増殖因子阻害薬、増殖因子受容体拮抗薬、転写リプレッサ、翻訳リプレッサ、複製阻害薬、抑制抗体、増殖因子に向けられた抗体、増殖因子と細胞毒素とからなる二官能基を有する分子、抗体と細胞毒素とからなる二官能基を有する分子等の血管細胞増殖阻害薬
・プロテインキナーゼ及びチロシンキナーゼ(例えば、チロホスチン、ゲニステイン、キノキサリン)
・プロスタサイクリン及びこれに類似する物質
・コレステロール低減薬
・アンギオポエチン
・トリクロサン、セファロスポリン、アミノグリコシド、ニトロフラントイン等の抗菌剤
・細胞障害性薬物、細胞分裂抑制薬、細胞増殖作動薬
・血管拡張薬
・内因性血管作用メカニズムを阻害する薬剤
・アンチセンスDNA及びアンチセンスRNA
・以下をコードするDNA
・アンチセンスRNA
・欠陥又は欠失がある内因性分子を置換するtRNA又はrRNA
・酸性及び塩基性線維芽細胞増殖因子、血管内皮細胞増殖因子、上皮成長因子、トランスフォーミング増殖因子α及びβ、血小板由来内皮細胞増殖因子、血小板由来増殖因子、腫瘍壊死因子α、肝細胞増殖因子、インシュリン様増殖因子等の増殖因子を含む血管新生因子
・CD阻害薬を含む細胞周期阻害因子
・チミジンキナーゼ(TK)及び細胞増殖を阻害する他の薬剤
・BMP−2、BMP−3、BMP−4、BMP−5、BMP−6(Vgr−1)、BMP−7(OP−1)、BMP−8、BMP−9、BMP−10、BMP−11、BMP−12、BMP−13、BMP−14、BMP−15、BMP−16を含む骨形成タンパク質(bone morphogenic protein:BMP)。現在、好ましいBMPは、BMP−2、BMP−3、BMP−4、BMP−5、BMP−6、BMP−7のいずれかである。これらの二量体タンパク質は、ホモ二量体であってもよく、ヘテロ二量体であってもよく、これらの組合せであってもよく、単独で提供しても、他の分子とともに提供してもよい。これに代えて、又はこれに加えて、BMPの上流又はム下流効果を誘導する分子を加えてもよい。このような分子は、あらゆる「ヘッジホッグ」タンパク質、又はこれらをコードするDNAを含む。
・遺伝子治療薬の送達用として注目されている以下のベクタ
・プラスミド
・アデノウイルス(AV)、アデノ随伴ウイルス(AAV)、レンチウイルス等のウイルスベクタ
・脂質、リポソーム、カチオン性脂質
・「細胞分裂抑制薬」(すなわち、例えばDNAの複製を阻害し、又は紡錘子の形成を阻害することにより、増殖細胞の細胞分裂を阻害又は遅延させる薬剤)。細胞分裂抑制薬の具体例としては、修飾されたトキシン、メトトレキサート、アドリアマイシン、放射性核種(例えば、フリッツバーグ(Fritzberg)他により米国特許第4,897,255号に開示されている)、スタウロスポリンを含むプロテインキナーゼ阻害薬、以下の化学式により表されるプロテインキナーゼC阻害薬、
・以下を含むCaチャンネル遮断薬
・ジルチアゼム及びクレンチアゼム等のベンゾジアゼピン
・ニフェジピン、アムロジピン、ニカルジピン等のジヒドロピリジン
・ベラパミル等のフェニルアルキルアミン
・以下を含むセロトニン経路モジュレータ
・ケタンセリン及びナフチドロフリル(naftidrofuryl)等の5HT拮抗薬
・フルオキセチン等の5HT取り込み阻害薬
・以下を含む環状ヌクレオチド経路薬
・シロスタゾール及びジピリダモール等のホスホジエステラーゼ阻害薬
・フォルスコリン等のアデニル酸/グアニル酸シクラーゼ刺激薬
・アデノシン類似薬
・以下を含むカテコラミンモジュレータ
・プラゾシン及びブナゾシン等のα遮断薬
・プロプラノロール等のβ遮断薬
・ラベタロール及びカルベジロール等のα/β遮断薬
・エンドセリン受容体拮抗薬
・以下を含む酸化窒素供与/放出分子
・ニトログリセリン、二硝酸イソソルバイド、亜硝酸アミル等の有機硝酸塩及び有機亜硝酸塩
・ニトロプルシドナトリウム等の無機ニトロソ化合物
・モルシドミン及びリンシドミン等のシドノニミン(sydnonimine)
・ジアゼニウムジオレート及びアルカンジアミンのNO付加物
・低分子化合物(カプトプリル、グルタチオン、N−アセチルペニシラミンのS−ニトロソ誘導体)及び高分子化合物(例えば、タンパク質、ペプチド、オリゴ糖、多糖類、合成ポリマ/低重合体、天然ポリマ/低重合体のS−ニトロソ誘導体)を含むS−ニトロソ化合物
・C−ニトロソ化合物、O−ニトロソ化合物、N−ニトロソ化合物
・L−アルギニン
・シラザプリル、フォシノプリル、エナラプリル等のACE阻害薬
・サララシン及びロサルタン等のATII(アンギオテンシン2)受容体拮抗薬
・アルブミン及びポリエチレンオキシド等の血小板接着阻害薬
・以下を含む血小板凝集阻害薬
・アスピリン及びチエノピリジン(チクロピジン及びクロピドグレル)
・アブシキシマブ、エプチフィバタイド、チロフィバン等のGP2b/3a阻害薬
・以下を含む凝固経路モジュレータ
・ヘパリン、低分子量ヘパリン、硫酸デキストラン、β−シクロデキストリンテトラデカ硫酸塩等のヘパリノイド
・ヒルジン、ヒルログ、PPACK(D−phe−プロピル−L−Arg−クロロメチルケトン)及びアルガトロバン等のトロンビン阻害薬
・アンチスタチン及びTAP(ダニ由来抗凝固性ペプチド:tick anticoagulant peptide)等のFXa阻害薬
・ワルファリン等のビタミンK阻害薬
・活性プロテインC
・アスピリン、イブプロフェン、フルルビプロフェン、インドメタシン、スルフィンピラゾン等のシクロオキシゲナーゼ経路阻害薬
・デキサメタゾン、プレドニゾロン、メチルプレドニゾロン、ヒドロコルチゾン等の天然及び合成コルチコステロイド
・ノルジヒドログアイアレチン酸及びコーヒー酸等のリポキシゲナーゼ経路阻害薬
・ロイコトリエン受容体拮抗薬
・E−セレクチン及びP−セレクチンの拮抗薬
・VCAM−1及びICAM−1の相互作用の阻害薬
・以下を含むプロスタグラジン及びこれに類似する物質
・PGE1及びPGE2等のプロスタグラジン
・シプロステン、エポプロステノール、カルバサイクリン、イロプロスト、ベラプロスト等のプロスタサイクリンに類似する物質
・ビスホスホネートを含むマクロファージ活性抑制薬
・ロバスタチン、プラバスタチン、フルバスタチン、シンバスタチン、セリバスタチン等のHMG−CoA還元酵素阻害薬
・魚油及びω−3−脂肪酸
・プロブコル、ビタミンC、ビタミンE、エブセレン、トランスレチノイン酸、SODミミック等のフリーラジカルスカベンジャ/抗酸化剤
・以下を含む様々な増殖因子に影響を与える薬剤
・bFGF抗体及びキメラ融合タンパク質等のFGF経路薬
・トラピジル等のPDGF受容体拮抗薬
・アンギオペプチン及びオクレオチド等のソマトスタチンに類似する物質を含むIGF経路薬
・ポリアニオン薬(ヘパリン、フコイジン)、デコリン、TGF−β抗体等のTGF−β経路薬
・EGF抗体、受容体拮抗薬、キメラ融合タンパク質等のEGF経路薬
・タリドミド及びこれに類似する物質等のTNF−α経路薬
・スロトロバン(sulotroban)、バピプロスト(vapiprost)、ダゾキシベン(dazoxiben)、リドグレル(ridogrel)等のトロンボキサンA2(TXA2)経路モジュレータ
・チロホスチン、ゲニステイン、キノキサリン誘導体等のタンパク質チロシンキナーゼ阻害薬
・マリマスタット、イロマスタット(ilomastat)、メタスタット等のMMP経路阻害薬
・サイトカラシンB等の細胞運動阻害薬
・以下を含む抗増殖/抗腫瘍薬
・プリンに類似する物質(6−メルカプトプリン等)、ピリミジンに類似する物質(サイタラビン、5−フルオロウラシル等)、メトトレキサート等の代謝拮抗物質
・ナイトロジェンマスタード、アルキルスルホン酸塩、エチレンイミン、抗生物質(例えば、ダウノルビシン、ドキソルビシン等)、ニトロソ尿素、シスプラチン
・微小管機能に影響を与える薬剤(例えば、ビンブラスチン、ビンクリスチン、コルチシン、パクリタキセル、エポチロン)
・カスパーゼ活性薬
・プロテアソーム阻害薬
・血管新生阻害薬(例えば、エンドスタチン、アンギオスタチン、スクアラミン)
・ラパマイシン、セリバスタチン、フラボピリドール、スラミン
・ハロフジノン又は他のキナゾリノン誘導体及びトラニラスト等のマトリックス沈着/組織経路阻害薬
・VEGF及びRGDペプチド等の内皮化促進薬
・ペントキシフィリン等の血液レオロジーモジュレータ
更に、上述の薬剤を組み合わせて用いてもよい。
・ブロックコポリマの分子量を変更する。
・ブロックコポリマのエラストマ部分及び熱可塑性部分として選択された特定の構成材料を変更し、及びこれらの構成材料の相対量を変更する。
・ブロックコポリマを処理するために用いる溶媒の種類及び相対量を変更する。
・ブロックコポリマの多孔度を変更する。
・ブロックコポリマ上に境界層を設ける。
・本発明に基づくコポリマと、他のポリマ又はコポリマとを混合する。
スチレン−ポリイソブチレン−ポリスチレンコポリマは、周知の手法を用いて合成される。カチオン化学の分野において周知のように、全ての溶媒及び反応物は、湿気、酸、抑制剤を含まないものである必要がある。したがって、購入した材料の品質によっては、反応処理を行う前に、これらの化学製品を蒸留し、又は乾燥剤、抑制剤除去剤等を含むカラムを通す必要がある場合がある。
溶媒を用いて、例えばステント等の医療器具をコーティングする手法の実施例を以下に説明する。周知のように、このような処理のために使用される溶媒は、選択されたブロックコポリマ及び治療薬の特性に応じて選択される。ポリスチレン−ポリイソブチレン−ポリスチレンコポリマ及びパクリタキセル治療薬とを用いる場合、好ましい溶液は、(1)0〜94%、好ましくは94%のトルエンと、(2)5〜99%、好ましくは5%のテトラヒドロフランと、(3)1%のコポリマ及びパクリタキセルの組合せとを含む。このような溶液は、(1)パクリタキセルとテトラヒドロフランとを混合し、(2)コポリマを加え、(3)トルエンを加え、(4)十分に(例えば、一晩)混合し、(5)(0.22ミクロンフィルタ等の微細なフィルタを介して)フィルタリングを行うことにより提供できる。続いて、この溶液を注射器に入れ、噴霧器ノズルに供給する。処理される部品(例えば、カテーテル、カテーテルバルーン、ステント、ステント植皮、血管移植片等)をノズルに平行な保持部材に装着し、必要であれば、回転させて(例えば、45RPMの速度で)、均一に被覆する。使用される噴霧器の種類に応じて、器具又は噴霧器ノズルのいずれを移動させてもよいが、噴霧器から1以上の経路を介して溶液を噴霧する間に、ノズルとコンポーネントとを相対的に移動させる。例えば、溶液(ポリスチレン−ポリイソブチレン−ポリスチレンコポリマ、パクリタキセル、トルエン、テトラヒドロフラン)を15psiの圧力、6.3mL/hrの流速で噴霧した場合、ノズルから部品までの距離を1.0インチとし、部品と噴霧器とが0.3〜0.5mm/秒の速度で移動しているとすると、2.5〜4.0ミクロンの厚みのコーティングが形成される。
他の好ましい実施例においては、例えばステント等の医療器具を回転させた状態で、エアーブラシを用いて、上述と同様の(1)0〜94%のトルエンと、(2)5〜99%のテトラヒドロフランと、(3)1%のコポリマ及びパクリタキセルとを含む溶液を噴霧する。噴霧中に、噴霧器と部品との間でテトラヒドロフラン及びトルエンが蒸発するように環境を制御することにより、回転されている部品上に、治療薬を含む多孔質のマットが形成される。噴霧は、所望の厚みが得られたときに終了する。
上述した溶媒を用いた手法によって部品又は層が形成された後、この部品又は層は、例えば、予熱されたオーブンに収納され、乾燥される(例えば、65℃で30分、70℃で3時間)。
薬剤の放出速度は、薬剤及びコポリマの相対量を変更することによって変更できる。図1は、ポリスチレン−ポリイソブチレン−ポリスチレンコポリマ及びパクリタキセルによってコーティング法されたNIRステントにおいて、薬剤の放出速度をポリスチレン−ポリイソブチレン−ポリスチレンコポリマ及びパクリタキセルの様々な比とともに示している。コーティングの調合物は、94%のトルエンと、5%のテトラヒドロフランと、1%のパクリタキセル及びポリスチレン−ポリイソブチレン−ポリスチレンコポリマとから構成され、図1では、同じ重量のコーティングにおいて、パクリタキセルとポリスチレン−ポリイソブチレン−ポリスチレンコポリマの重量比を35%−65%、32.5%−67.5%、30%−70%、25%−75%、22.5%−87.5%、20%−80%、17.5%−83.5%にした場合のそれぞれの放出速度を示している。なお、コーティングの厚みは、約16ミクロンであった。図1に示すように、薬剤の放出速度は、パクリタキセルの比率が高い場合(35%)に速く、パクリタキセルの比率が低い場合(17.5%)に遅くなる。
実験のため、次のような各種のステントを準備した。(1)無加工のステンレススチールNIRステント(イスラエル、メディノール社(Medinol))、(2)周知の「生体安定性」ポリカーボネートウレタンポリマ(マサチューセッツ州、ウーバン、カルディオテック社(CardioTech Inc.)、クロノフレックスAL(Chronoflex AL)によってコーティングされたNIRステント(3)ポリ乳酸(PLA)及びポリグリコール酸(PGA)からなる周知の「生体分解性」コポリマ(アラバマ州、バーミンガム、バーミンガムポリマ社(Birmingham Polymers)によってコーティングされたNIRステント、(4)本発明に基づく、ポリスチレン−ポリイソブチレン−ポリスチレンコポリマによってコーティングされたNIRステント。
Claims (5)
- 血管間又は血管内医療器具と、
上記血管間又は血管内医療器具の少なくとも一部を被覆するコーティングとを備え、
前記コーティングはポリスチレン-ポリイソブチレン-ポリスチレンブロックコポリマ及び治療薬からなり、
上記血管間又は血管内医療器具がバルーン、ステント、シャント、カテーテル、ステント植皮、血管移植片、血管パッチ、シャントおよびフィルターから選択されることを特徴とする、被覆された医療器具。 - 上記ブロックコポリマの分子量は、80000〜300000ダルトンの範囲内であることを特徴とする、請求項1に記載の被覆された医療機器。
- 上記ポリイソブチレンブロックの分子量は、60000〜200000ダルトンの範囲内であり、上記ポリスチレンブロックの分子量は、20000〜100000ダルトンの範囲内であることを特徴とする、請求項1に記載の被覆された医療機器。
- コーティングの厚みが0.1〜50ミクロンである、請求項1に記載の被覆された医療機器。
- 前記医療機器が、さらにバリア層であるコーティングを含む、請求項1に記載の被覆された医療機器。
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