JP2012525409A - テトラピロール誘導体のための新規の経口製剤 - Google Patents
テトラピロール誘導体のための新規の経口製剤 Download PDFInfo
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- JP2012525409A JP2012525409A JP2012508644A JP2012508644A JP2012525409A JP 2012525409 A JP2012525409 A JP 2012525409A JP 2012508644 A JP2012508644 A JP 2012508644A JP 2012508644 A JP2012508644 A JP 2012508644A JP 2012525409 A JP2012525409 A JP 2012525409A
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Abstract
【選択図】図1
Description
一般に、テトラピロール化合物及びその誘導体の錠剤の形態は、所定の割合の光増感剤(活性剤)、所定の割合の界面活性剤、フィラー、崩壊剤、潤滑剤、流動促進剤、バインダー、吸収促進剤、溶液遅延剤、湿潤剤、吸収剤;緩衝剤、並びに凝集を回避するように容易な崩壊及び腸領域での錠剤の溶解を保証する少ない割合の化合物を有するだろう。界面活性剤の使用は、疎水性光増感剤を安定化させ凝集を回避する一助となる。
実施態様にひとつにおいて、カプセル、ゼラチン被覆は、光増感剤製剤を封入するために用いられる。カプセルは、吸収を遅らせるために、摂取後、数時間未変化のままでいるようにデザインされ得る。それらはまた、同じ用量で早められた及び遅くされた吸収を作り出すように、早く及び遅く放出する粒子の混合物を含む。2つの主要なタイプのカプセルは、堅い殻のカプセル(乾燥した粉末化された成分に用いられる)及び柔らかい殻のカプセル(油に、及び油に溶解又は懸濁される活性成分に用いられる)である。これらのクラスのカプセルの両方は、ゼラチンと、カラギーナン並びにスターチ及びセルロースの変形形態のような植物ベースのゲル化物質と、の両方から作られる。
さらに他の実施態様において、液体カプセルが用いられる;それらは吸収を促進することにより疎水性光増感剤のバイオアベイラビリティを向上させるからである。液体カプセル(Liquid filling)は具体的には、簡易化された製造プロセスに起因した強力な活性化合物及び細胞毒性化合物を含む製品において、並びに他の形式で低い溶解性又は乏しいバイオアベイラビリティを示す製品において、適切である。可溶化剤は、限定されることなく、ポリエチレングリコール/マクロゴール(Lutrol(登録商標)(BASF AG))を含む。
本発明の“Foslipos”という用語は、サッカライドを添加されておらず、凍結乾燥されない、リポソーム小胞を形成することにより疎水性光増感剤を封入する脂質製剤を意味する。脂質は、疎水性薬物を可溶化することができ、そのため、脂質ベースのドラッグデリバリーシステムは消化管における薬物吸収及び溶解速度を改善させることが証明されてきた。
疎水性光増感剤、典型的な2又は3以上の合成リン脂質及び少なくともひとつのPEG化リン脂質は、アルコール溶液に溶解される。溶液をその後、ロータリーエバポレーターを用いて真空下で乾燥させる。混合物をその後100ナノメートルの最終孔径を用いたホモジナイザーフィルターシステムに通過させる。再水和中、水はモノサッカライドで補われる。ろ液を収集し、バイアルに充填し、任意に凍結乾燥させる。
他の実施態様において、ナノ及びマイクロエマルションの経口製剤が、光増感剤の経口投与に対して用いられる。エマルションは液体システムであり、それにおいて、ひとつめの液体がふたつめの非混和性液体中に分散している(乳化剤有り又は無し)(通常は液滴中)。SMEDDS(マイクロエマルションシステム)は、延長された品質保持期間を短くする疎水性薬物の熱力学的に安定なキャリアシステムである。マイクロエマルション製剤の本製剤は、非毒性、非刺激性、及び薬学的に許容可能な成分を用いて調製される。
マイクロエマルションを形成することのできるこの経口投与可能な組成物は、少なくとも、
有効成分、
脂肪酸エステル及びグリセリドの混合物からなる脂溶性の相、
界面活性剤(SA)、
共活性剤(CoSA)、
溶媒、
親水性相、
を含み、該脂溶性の相は、16未満の親水性−脂溶性バランス(HLB)を有する炭素数8〜18のポリグリコライズドグリセリドの混合物からなり、この脂溶性の相は、組成物の全重量中1〜75%含まれ;界面活性剤(SA)は、炭素数8〜10の飽和ポリグリコライズドグリセリド及びポリグリセロールのオレイン酸エステルを含む群より選択され、この界面活性剤もまた16未満のHLBを有し;共活性剤(CoSA)は、プロピレングリコールのラウリン酸エステル、ポリグリセロールのオレイン酸エステル、及びエチルジグリコールを含む群より選択され;SA/CoSA比は、0.3〜8の間であり;最終のマイクロエマルションの親水性相は、消化環境の生理液による摂取後に供給される。
不溶性薬物を高度に可溶化させる前述の方法の代替手段は、粒子サイズを小さくすることであり、それにより表面積が増大し、その結果溶解率が増大する。しかしながら、マイクロ化のみでは、これらの種類の薬物の所望のバイオアベイラビリティを得るには十分ではない。粒子サイズがサブマイクロメーターのサイズ範囲となれば、ナノ化は薬物のより高いバイオアベイラビリティを提供することが示されてきた(Mullerら、1998、2001)。薬物溶解率及び化合物の飽和溶解度が増大するからである。文献において薬物粒子サイズをナノメーター範囲に小さくする異なる方法が記載されており、例えば、沈殿(Trottaら、2001)、ジェットミル、パールミル(Liversidge及びConzentino、1995)、及び高圧ホモジネーション(Muller&Keck、2004)である。
本発明の他の実施態様において、経口投与される製剤の成分は、油及び脂肪化合物とmTHPCとの混合物である。異なる濃度の大豆油、中鎖トリグリセリド、グリセロール、卵レシチン、α−トコフェロール、オレイン酸ナトリウム、及び水を含むこのようなエマルションは、栄養輸液におけるカロリー源として臨床的に用いられる。
本発明の他の実施態様において、経口投与される製剤の成分は、適切な添加剤にブレンドされた生体適合性ポリマーとmTHPCとの混合物である。これらの混合物は、均一に溶融され、シングル又はツインスクリュー押出機により押し出され、APIの固体分散体を形成するだろう。これらの固体分散体は、湿潤性及びバイオアベイラビリティのより高いグレードに起因するAPIのより高い溶解率を示し、その結果、消化管における薬物放出を向上させる。適切なポリマーは、“塩基性ブチル化メタクリレートコポリマー(aPMMA)”、コポビドン(COP)、ポリエチレングリコール−ポリビニルアルコールコポリマー(PEG−PVA)、オイドラギット−改良剤及び他のポリマー、並びに本発明の技術分野における当業者に公知の添加剤の群から非排他的に選択され得る。
本発明の他の実施態様において、活性薬物化合物は、ナノ結晶製剤において経口投与され得る。極めて細かく粉砕された薬物(例えば、テモポルフィン)は、大きな表面積を有するように、界面活性剤により安定化され、最終的には噴霧乾燥され得、それにより消化管における安定的に吸収が促進される。
本発明の一実施態様において、光増感剤は経口投与のためのリポソームにカプセル化される。リポソーム小胞は、経口投与される疎水性光増感剤の溶解性を向上させ得る。
経口製剤はまた、光増感剤が吸収され、光増感剤が含まれ、又は光増感剤が共有結合しているナノ粒子を含む。好ましい製剤において、ナノ粒子は、本技術分野において知られたような、ヒト血清アルブミン(HSA)又はポリ(ラクチド−co−グリコライド)(PLGA)といった生分解性マテリアルから形成される。
アルファフェトプロテイン(AFP)は、光増感剤を腫瘍細胞に標的化するように、この製剤におけるoncoshuttleとして用いられる。AFPは、ほとんどの癌がAFP受容体(AFPR)を発現しそれゆえ特異的な標的であるため、oncoshuttleとして用いられる。AFPは、約600のアミノ酸を含有するポリペプチド鎖及び大きな異種の炭水化物分子からなる大きな糖タンパク質である。AFP分子は、15のジスルフィド結合を含む。ジスルフィド結合が三次構造を決定する一方で、炭水化物は分子に特定の結合特性をもたらす。
1)AFPタンパク質の除荷(unloading)
2)薬物物質のタンパク質への結合
3)タンパク質−薬物−複合体の分離及び保存
ウシ血清アルブミン(BSA)といった天然のタンパク質は、経口投与のための光増感剤をカプセル化するために本発明において用いられる。AFPのアミノ酸配列は、ウシ血清アルブミンに著しく高い相同性を有する。アルブミン様タンパク質の特性は、2つのアルファヘリカルグロビン様サブドメインにより形成された構造的に相同する3つのドメインの存在である。したがって、BSAはまた、PDTにおいて効果的なキャリアとして用いられ得る。BSAは17のジスルフィド結合を有する大きな球状タンパク質である。BSA製剤の調製過程は、以下の通りである。
1)BSAタンパク質の除荷(unloading)
2)薬物物質のタンパク質への結合
3)タンパク質−薬物−複合体の分離及び保存
HIG82、HT29、及びJ774A1のような異なる細胞株における2,3−ジヒドロ−2,3−ジヒドロキシ−15,20−ジヘキシル−5,10−ビス(4−カルボキシフェニル)ポルフィリン(BLC6066)の光無しでの毒性作用(図3参照)は、約24時間、2〜10μMの範囲のBLC6066の異なる漸増濃度で培養細胞をインキュベートすることにより決定された。10μMの濃度のBLC6066でインキュベートされた細胞は、ヒト細胞において明確な毒性を示し、さらに細菌の細胞に対しても光無しでの強い毒性を示した。
Foslipos(DPPC及びDPPGを含有する、mTHPCの脂質ベースの製剤)
薬物用量:300μg mTHPC
試験は、成体雌無胸腺NMRI nu/nuマウス(Harlan Winkelmann GmbH、ドイツ)を用いて行った。22−24gの体重の6−8週齢のマウスの左後部大腿部にHT29ヒト結腸直腸癌細胞の懸濁液(5%グルコース中8×107細胞/mLの0.1mL)を皮下注射して移植した。実験は10日後に行われ、そのとき、腫瘍は約5−8mmの表面直径及び高さ2−3mmの厚さに到達していた。
動物をFoslipos経口投与後50時間で屠殺した(各時間ポイントで3匹のマウス)。動物の屠殺直後に、血漿、肝臓、脾臓、結腸、腫瘍、皮膚、及び骨格筋を解剖し、重量を測定し、−70℃で保存した。すべての組織サンプルは、外科用メスでカットすることにより小片に分け、重量を測定し、凍結乾燥させた(Christ Freeze drying system Alpha 1−4 LSC)。残りの粉末化された組織の重量を測定し、約10−20mgを2.0mLの反応チューブに移し、1.5mLのメタノール:ジメチルスルフォキシド(DMSO)(3:5、v:v)を加えた。サンプルを2,400rpmで作動するボルテックスミキサー(MELB1719、Merck Europub)を用いて5秒間混合し、その後、少なくとも12時間持続的な振盪下60℃でインキュベートした。すべてのサンプルを5分間、16,000gで遠心分離した(Microfuge、Heraeus、ドイツ)。各々の上清の1mLをHPLC分析用のHPLCバイアルに移した。
本出願は、米国仮特許出願61/173,487(出願日2009年4月28日)、及び米国特許出願12/768,244(出願日2010年4月27日)に基づく35USC§119(e)に基づく優先権主張の利益を有する。これら両方の出願の発明の名称は“テトラピロール誘導体に対する新規の経口製剤”であり、発明者は、スザンナグラフェらである。これらの出願は、本明細書に参照により取り込まれる。
Claims (11)
- 疎水性光増感剤のための経口製剤。
- 酸又は酵素を含む胃消化マテリアルにより顕著に分解されず、肝臓又は腎臓に集積しない、光増感剤と、
必要に応じた不活性成分と、
を含有する光線薬物の経口製剤であって、
前記経口製剤は、過形成性疾患治療及び抗菌治療において有用である、
ことを特徴とする経口製剤。 - 前記光増感剤は、アントラキノン誘導体又は脂肪族アミン以外の構造を有し得る、
ことを特徴とする請求項1又は2に記載の経口製剤。 - 前記光増感剤は、テトラピロール及びその誘導体又はフェナジン色素及びその誘導体である、
ことを特徴とする請求項1又は2に記載の経口製剤。 - 消化管において代謝されない生分解性ナノ粒子若しくはナノ粒子に、それ自体、吸収され、含まれ、又は共有結合された光増感剤、及び適切な添加剤をさらに含む、請求項1又は2に記載の経口製剤。
- 光増感剤、及び自己マイクロ乳化ドラッグデリバリーシステム(SMEDDS)を形成する適切なガレヌス製剤添加剤をさらに含む、請求項1又は2に記載の経口製剤。
- 光増感剤、及び適切な薬学上許容可能な界面活性剤を含み、
光増感剤及び添加剤は、安定的なナノ結晶を形成するように本技術分野の当業者により周知の方法で調製される、
ことを特徴とする請求項1又は2に記載の経口製剤。 - 光増感剤を経口投与し、標的組織における集積時間を許容し、その後に標的組織における前記光増感剤を活性化するように適切なエネルギーを適用することにより、腫瘍、異形成又は他の医学的若しくは美容上のコンディションを治療する方法。
- 同時に壊死を制限する間、光感受性を最小化し薬物の有用性を最大化し、及び免疫システムサポートといった有益な身体サポート反応を最大化する間、腫瘍異形成又は他の望ましくない組織さらには脂肪といった標的組織の順次の殺傷を引き起こす、最適化された治療レジメンよる治療方法。
- 好ましくは全身的に少ない用量を適用し、適切な間隔で活性化し、前記活性化の後に、標的組織に身体の他部分から再供給される薬物由来の利益を得るべきである1又は2以上の活性化が起こり、適切な時間(例えば1週間)の後、前述の順番が繰り返され、このサイクルが複数回繰り返される治療方法。
- 前記経口製剤は、Foscanといった長時間安定型光増感剤又は抗菌光増感剤を含む、
ことを特徴とする請求項8乃至10のいずれか1項に記載の方法。
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