JP7467548B2 - Pegmema及び薬物担持ポリマーセグメントから構成される自己集合化ジブロックコポリマー - Google Patents
Pegmema及び薬物担持ポリマーセグメントから構成される自己集合化ジブロックコポリマー Download PDFInfo
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- JP7467548B2 JP7467548B2 JP2022134497A JP2022134497A JP7467548B2 JP 7467548 B2 JP7467548 B2 JP 7467548B2 JP 2022134497 A JP2022134497 A JP 2022134497A JP 2022134497 A JP2022134497 A JP 2022134497A JP 7467548 B2 JP7467548 B2 JP 7467548B2
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- C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
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Description
・R1及びR2は、独立して、H又は-CH3から選択される
・R3は、-H又は-CH3から選択される
・xは、1~100の自然数である
・yは、1~100の自然数である
・nは、1~50の自然数である
・Lは、切断可能なリンカーであるか、又はLは、ヌルであってもよい
・Dは、コンブレタスタチン、5-フルオロウラシル、ゲムシタビン、クロロキン、及びドキソルビシンを含む群から選択される治療薬である
・Aは、末端基であるか、又はAは、ヌルであってもよい
・Bは、末端基であるか、又はBは、ヌルであってもよい
・R1及びR2は、独立して、H又は-CH3から選択される
・R3は、-H又は-CH3から選択される
・xは、1~100の自然数である
・yは、1~100の自然数である
・nは、1~50の自然数である
・Lは、切断可能なリンカーであるか、又はLは、ヌルであってもよい
・Dは、コンブレタスタチン、又は5-フルオロウラシル、又はゲムシタビン、又はクロロキン、又はドキソルビシンである治療薬である
・Aは、末端基であるか、又はAは、ヌルであってもよい
・Bは、末端基であるか、又はBは、ヌルであってもよい
・R1及びR2は、独立して、H又は-CH3から選択される
・R3は、-H又は-CH3から選択される
・xは、1~100の自然数である
・yは、1~100の自然数である
・nは、1~50の自然数である
・Lは、切断可能なリンカーであるか、又はLは、ヌルであってもよい
・Dは、コンブレタスタチン、又は5-フルオロウラシル、又はゲムシタビン、又はクロロキン、又はドキソルビシンである治療薬である
・Aは、末端基であるか、又はAは、ヌルであってもよい
・Bは、末端基であるか、又はBは、ヌルであってもよい
式中、
・R1は、H又は-CH3から選択される
・R3は、-H又は-CH3から選択される
・nは、1~50の自然数である
式IIaのポリマーを得、
式中、
・Aは、末端基であるか、又はAは、ヌルであってもよい
・Bは、末端基であるか、又はBは、ヌルであってもよい
・式中、R2は、H又はCH3から選択される
・Lは、切断可能なリンカーである、又はLは、ヌルであってもよい
・Dは、コンブレタスタチン、5-FU、ゲムシタビン、クロロキン、ドキソルビシンを含む群から選択され、式Iのポリマー-薬物コンジュゲートを得る治療薬である。
式中、
・R1は、H又は-CH3から選択される
・R3は、-H又は-CH3から選択される
・nは、1~50の自然数である
式IIaのポリマーを得、
式中、
・Aは、末端基であるか、又はAは、ヌルであってもよい
・Bは、末端基であるか、又はBは、ヌルであってもよい
・式中、R2は、H又は-CH3から選択される
・Lは、切断可能なリンカーであるか、又はLは、ヌルであってもよい
式IIbに示されるようなコポリマーを得る
・式中、xは、1~100の自然数であり
・yは、1~100の自然数である
式中、
・R1は、H又は-CH3から選択される
・R3は、-H又は-CH3から選択される
・nは、1~50の自然数である
式IIaのポリマーを得、
式中、
・Aは、末端基であるか、又はAは、ヌルであってもよい
・Bは、末端基であるか、又はBは、ヌルであってもよい
・式中、R2は、H又は-CH3から選択される
・Lは、切断可能なリンカーである、又はLは、ヌルであってもよい
・Dは、コンブレタスタチン、5-FU、ゲムシタビン、クロロキン、ドキソルビシンを含む群から選択され、ブロックコポリマーを得る治療薬であり、次いで、(iii)形成されたブロックコポリマーを標的部分と反応させて、式Iに示されるポリマー-薬物コンジュゲートを得る。
式中;
-xは、1~100の自然数である、
-yは、1~100の自然数である、
-R1及びR2は、独立して、H又は-CH3から選択される、
-R3は、-H又は-CH3から選択される
-nは、1~50の自然数である、
-Lは、切断可能なリンカーである、又はLは、ヌルであってもよい
-Aは、末端基であるか、又はAは、ヌルであってもよい
-Bは、末端基であるか、又はBは、ヌルであってもよい。
以下の例は、式Iのポリマー-薬物コンジュゲート及びそれらのポリマー集合体の段階的調製を提供する。
コンブレタスタチン-A4(300mg、0.95mmol)、トリエチルアミン(TEA、191mg、1.89mmol)、塩化メタクリロイル(198mg、1.89mmol)をN2下で25mLの丸底フラスコ中で乾燥ジクロロメタン(DCM、10mL)に溶解した。反応液を室温で16時間撹拌した。粗生成物を飽和NaHCO3(20mL×2)及び蒸留水(20mL×2)で抽出した。有機層をNa2SO4で乾燥し、溶媒を蒸発させた。CombMAモノマーを、ヘキサンを用いたシリカカラムクロマトグラフィーを使用して精製した。
4-シアノペンタン酸ジチオペンタのアート(CPDB)は、CTAであり、このCTAを以下の手順に従って反応性官能基であるN-ヒドロキシスクシンイミド(NHS)で修飾した。
可逆的付加-開裂連鎖移動(RAFT)重合をPOEGMEMA及びNHS活性化POEGMEMA(NHS-POEGMEMA)ホモポリマーの合成に使用した。POEGMEMAポリマーを合成するために、DMF(3mL)中のOEGMA(600mg、2.0mmol)及びCPADB(20.12mg、0.072mmol)の溶液に、AIBN(1.31mg、0.008mmol)を添加した。混合物をN2でパージしてO2を除去し、重合を70℃で撹拌した。冷却及び空気暴露により重合を停止させた。POEGMEMAポリマーをジエチルエーテル中で沈殿させることにより精製した。ポリマー沈殿物を真空下で乾燥させて、約35のOEGMEMA繰り返し単位(460mg、収率77%)を得た。NHS-POEGMEMAホモポリマーの合成のために、連鎖移動剤としてSCPDB(27.10mg、0.072mmol)を使用して同じ手順を適用して、約35のOEGMEMA繰り返し単位(480mg、収率80%)を得た。
RAFT重合をPOEGMEMA-b-PCombMA及びNHS-POEGMEMA-b-PCombMAブロックコポリマーの合成に使用した。DMF(0.75mL)中のCombMA(100mg、0.26mmol)及びマクロ連鎖移動剤としてのPOEGMEMAポリマー(50mg、0.005mmol)の溶液に、AIBN(0.15mg、0.00092mmol)を添加した。混合物をN2でパージしてO2を除去し、重合を65℃で撹拌した。冷却及び空気暴露により重合を停止させた。粗生成物をジエチルエーテル中で沈殿させた。ポリマー沈殿物を真空乾燥して、約32のCombMA繰り返し単位(98mg、65%収率)を得た。マクロ連鎖移動剤としてNHS-POEGMEMA(50mg、0.005mmol)を使用してNHS-POEGMEMA-b-PCombMAブロックコポリマーを合成するために同じ手順を適用して、約33のCombMA繰り返し単位(105mg、収率70%)を得た。
NHS-POEGMEMA-b-PCombMA(50mg、0.002mmol)及びcRGDfK(6.4mg、0.01mmol)をDMF(0.25mL)に共溶解し、この反応混合物にN,N-ジイソプロピルエチルアミン(6.5mg、0.05mmol)を添加した。反応混合物を30℃で24時間撹拌した。粗生成物をジエチルエーテル中で沈殿させた。ポリマー沈殿物を減圧乾燥して、cRGDfK-POEGMEMA-b-CombMA(41mg、収率82%)を得た。cRGDfK-POEGMEMA-b-CombMAブロックコポリマーの調製を示す全体図を図1として提供する。
本明細書において、「標的化」とは、cRGDfK-POEGMEMA-b-CombMAブロックコポリマーからなるポリマー集合体を指し、「非標的化」とは、POEGMEMA-b-PCombMAブロックコポリマーからなるポリマー集合体を指す。
蛍光プローブ法を標的化及び非標的化集合体のCMC値の決定に利用した。ブロックコポリマー溶液(450μL)を、上記のようにバイアル中で段階希釈を使用してTHF中で調製した。THF中のナイルレッドの50μL溶液(0.03mg/mL)、次いで3mLの水を各バイアルに添加した。THFを開放雰囲気で完全に蒸発させ、3mLの水中1×10-9~1×10-5Mの範囲の16個の試料についての最終濃度値を得た。蛍光測定値を550nmの励起波長で蛍光分光光度計により記録し、発光を580~660nmでモニターした。
5-フルオロウラシル(250mg、1.92mmol)及び37%ホルマリン(244μL)を60℃で2時間反応させた。次いで、混合物を冷却し、完全に凍結乾燥して粘稠な化合物を得た。第2の工程として、この生成物(315mg、1.97mmol)を無水アセトニトリル(5.8mL)に溶解し、次いでトリエチルアミン(422μL、3.03mmol)をこの溶液に添加した。反応混合物を0℃に冷却した後、塩化メタクリロイル(232μL、2.38mmol)を滴下した。反応を室温で一晩進行させ、次いで白色沈殿物を濾別した。全ての揮発物を真空下で蒸発させ、次いで粗生成物をジクロロメタン(20mL)で溶解し、続いて1MのHCl(2×10mL)、1MのNaHCO3(10mL)、及びブライン(10mL)で抽出した。有機部分を濃縮した後、生成物を、エチルアセタート:ヘキサン混合物(30:70v/v)で溶出するシリカカラムクロマトグラフィーにより純粋な形で単離した。生成物を粘性無色油状物として得た(305mg、収率68%)。
可逆的付加-開裂連鎖移動(RAFT)重合をPOEGMEMAホモポリマーの合成に使用した。POEGMEMAポリマーの合成のために、DMF(2.5mL)中のOEGMA(500mg、1.66mmol)及びCPADB(11.97mg、42.85μmol)の溶液に、AIBN(0.78mg、4.76μmol)を添加した。混合物をN2でパージしてO2を除去し、重合を70℃で16時間撹拌した。冷却及び空気暴露により重合を停止させた。POEGMEMAポリマーをジエチルエーテル中で沈殿させることにより精製した。ポリマー沈殿物を真空乾燥して、95mgのポリマーを収率19%で得た。
RAFT重合をPOEGMEMA-b-P5FU-MAブロックコポリマーの合成に使用した。DMF(0.30mL)中の5FU-MA(17.9mg、78.6μmol)及びマクロ連鎖移動剤としてのPOEGMEMAポリマー(40mg、3.93μmol)の溶液に、AIBN(0.13mg、0.786μmol)を添加した。混合物をN2でパージし、O2を除去して重合を70℃で16時間撹拌した。冷却及び空気暴露により重合を停止させた。粗生成物をジエチルエーテル中で沈殿させた。ポリマー沈殿物を真空乾燥して、16mgのポリマーを収率28%で得た。
2-ヒドロキシエチルメタクリラート(500mg、3.8mmol)、4,4’-ジチオ酪酸(1.83g、7.6mmol)、N,N’-ジシクロヘキシルカルボジイミド(1.59mg、7.8mmol)、4-(ジメチルアミノ)ピリジン(281mg、2.3mmol)を100mL丸底フラスコ中のN2下で無水ジクロロメタン(DCM)(54mL)に溶解した。反応液を室温で16時間撹拌した。粗生成物を冷ジエチルエーテル中で沈殿させ、-20℃で20分間放置した。生成物を、エチルアセタート及びヘキサン(20:80v/v)を用いるシリカカラムクロマトグラフィーを使用することにより精製した(426mg、収率32%)。
可逆的付加-開裂連鎖移動(RAFT)重合をPOEGMEMAの合成に使用した。POEGMEMAポリマーの合成のために、DMF(5mL)中のOEGMA(1.0g、3.3mmol)及びCPADB(36.88mg、0.133mmol)の溶液に、AIBN(2.17mg、0.0013mmol)を添加した。混合物をN2でパージし、O2を除去して、重合を70℃で16時間撹拌した。冷却及び空気暴露により重合を停止させた。POEGMEMAポリマーをジエチルエーテル中で沈殿させることにより精製した。ポリマー沈殿物を真空乾燥して、715mgのポリマーを収率69%で得た。
POEGMEMA-b-PComb-SS-MAブロックコポリマーの合成には、RAFT重合を使用した。DMF(1.07mL)中のComb-SS-MA(80mg、0.20mmol)及びマクロ連鎖移動剤としてのPOEGMEMAポリマー(134mg、0.020mmol)にAIBN(0.68mg、0.004mmol)を添加した。混合物をN2でパージしてO2を除去し、重合を65℃で撹拌した。冷却及び空気暴露により重合を停止させた。粗生成物をジエチルエーテル中で沈殿させた。ポリマー沈殿物を真空乾燥して、収率65%で98mgのポリマーを得た。
配列表2 <223>配列番号2
配列表3 <223>周期
Claims (3)
- 治療薬を送達するためのブロックコポリマーの形態の式Iのポリマー-薬物コンジュゲート、
式中、
・R1、R2、及びR3は、独立して、H又は-CH3から選択される
・xは、1~100の自然数である
・yは、1~100の自然数である
・nは、1~50の自然数である
・Lは、切断可能なリンカーであるか、又はヌルであり治療薬Dがポリマー鎖にエステル、イミン、アミド、ジスルフィド、カーボナート、カルバマート又はヒドラジンを介して直接結合している
・Dは抗癌剤であり、コンブレタスタチン、又は5-フルオロウラシル(5-FU)、又はゲムシタビンである
・Aは、末端基であり、標的部分とコンジュゲーションした連鎖移動剤の断片もしくは開始剤の断片であり、該標的部分は抗体、抗体断片又はペプチドからなる群から選択される
・Bは、末端基であるか、又はBはヌルである。 - 請求項1に記載の式Iのポリマー-薬物コンジュゲートを用いて形成されたポリマー集合体(ナノ粒子又はミセル)、
式中、
・R1、R2、及びR3は、独立して、H又は-CH3から選択される
・xは、1~100の自然数である
・yは、1~100の自然数である
・nは、1~50の自然数である
・Lは、切断可能なリンカーであるか、又はLは、ヌルであり治療薬Dがポリマー鎖にエステル、イミン、アミド、ジスルフィド、カーボナート、カルバマート又はヒドラジンを介して直接結合していてもよい
・Dは抗癌剤であり、コンブレタスタチン、又は5-フルオロウラシル(5-FU)、又はゲムシタビンである
・Aは、末端基であり、標的部分とコンジュゲーションした連鎖移動剤の断片もしくは開始剤の断片であり、該標的部分は抗体、抗体断片又はペプチドからなる群から選択される
・Bは、末端基であるか、又はBは、ヌルであってもよい。 - 疎水性相互作用により式Iのポリマー-薬物コンジュゲートに結合した、カプセル化された抗癌剤を第二の抗癌剤としてさらに含む、請求項2に記載のポリマー集合体(ナノ粒子又はミセル)。
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2016
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