JP4866612B2 - 生理活性複合体 - Google Patents
生理活性複合体 Download PDFInfo
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- JP4866612B2 JP4866612B2 JP2005515453A JP2005515453A JP4866612B2 JP 4866612 B2 JP4866612 B2 JP 4866612B2 JP 2005515453 A JP2005515453 A JP 2005515453A JP 2005515453 A JP2005515453 A JP 2005515453A JP 4866612 B2 JP4866612 B2 JP 4866612B2
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- Prior art keywords
- interferon
- polyethylene glycol
- complex
- molecule
- protein
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Description
常法にしたがって、ヒトリンパ芽球由来株化細胞BALL−1(JCRB0071:ジャパニーズ・コレクション・オブ・リサーチ・バイオリゾーシス)から染色体DNAを採取し、これを鋳型として、配列表における配列番号4(制限酵素NdeI切断部位、開始コドン、及びインターフェロンα8の5´末端付近の塩基配列を有する)及び配列番号5(制限酵素BamHI切断部位、終止コドン、インターフェロンα8の3´末端付近の塩基配列を有する)で表されるオリゴヌクレオチドをプライマーとして、常法のPCR法により、プライマー配列に特異的なDNAを増幅した後、制限酵素NdeI及びBamHIにより消化した。これを、T7プロモーター領域、T7ターミネーター領域、アンピシリン耐性遺伝子領域及びColE1・Ori領域を有するプラスミドベクター(商品名『pET−3a』、ノバジェン社製)へ、その上記制限酵素部位に導入した。インターフェロンα8をコードするDNA領域を常法のDNAシーケンサーにより解析したところ、配列表の配列番号2の塩基配列が解読され、インターフェロンα8bをコードするDNAであることが判明した。さらに、このプラスミドを大腸菌BL21DE3株へ導入し、組換え型インターフェロンα8産生用の大腸菌を得た。これを常法により、T−ブロス培地で培養し、遠心分離により菌体を回収した。得られた菌体を、TES緩衝液(pH8.0)にて2回洗浄後、0.2mg/mlリゾチームを含むTES緩衝液(pH8.0)(20mMトリス塩酸、10mMエチレンジアミン4酢酸、及び0.5M塩化ナトリウム)に加え、常法にしたがい超音波処理し、遠心分離し、インターフェロンα8を含む残さを回収した。これを1%(w/v)トリトンエックス−100を含むTES緩衝液に加え、攪拌後に遠心分離して上清を除く操作を3回行い、得られた沈澱物を8Mグアニジン塩酸塩及び50mMジチオスレイトールを含む、50mMトリス塩酸緩衝液(pH7.0)に加え、遮光下で室温で16時間攪拌し、遠心分離して、上清を回収した。これに100倍量の1Mトリス、0.9(w/v)%塩化ナトリウム、0.4ML−アルギニン塩酸塩、2.5mM還元型グルタチオン、0.5mM酸化型グルタチオン、0.05(w/v)%ツイーン20に少量ずつ徐々に攪拌しつつ加えた後、4℃で16時間静置した。これを4倍量の0.1(w/v)%ウシ血清アルブミンを含むリン酸食塩緩衝液(pH7.2)に加え、pHを6.5乃至7.5に調整した後、常法にしたがって、抗インターフェロンα抗体カラムクロマトグラフィーによりインターフェロンα活性を有するフラクションを採取した。これをさらに、ゲル濾過クロマトグラフィー(商品名『Superdex75』、アマシャムバイオサイエンス社製)により脱塩処理を行い、組換え型インターフェロンα8を得た。そのN末端を、常法にしたがって、ペプチドシーケンサーにより解析したところ、「システイン−アスパラギン酸−ロイシン−プロリン−グルタミン−」であり、本実施例で製造した組換え型インターフェロンα8は、大腸菌発現のために付加した開始コドンがコードするメチオニン残基を有していないことが判明した。
実施例1の方法により得たインターフェロンα8を燐酸緩衝生理食塩水(pH7.2)に濃度0.1乃至1mg/mlになるように溶解した後、水溶性の高分子としてモノメトキシN−サクシンイミジルプロピオネートにより活性化させたポリエチレングリコール(m−PEG−SPA、平均分子量5,000ダルトン)をモル比で蛋白質の3倍になるように加え、37℃で30分間反応させた。次いで、反応混合物へε−アミノカプロン酸をモル比で水溶性の高分子の10倍量加え、暫時静置して反応を停止させた後、反応混合物を陰イオン交換クロマトカラム(商品名『Mono S』、アマシャムバイオサイエンス社製)によりHPLC分画して蛋白質に結合していないポリエチレングリコールを除去した。さらにゲル濾過クロマトカラム(商品名『Superose12』、アマシャムバイオサイエンス社製)を用いてHPLCにより分画し、得られた分画からそれぞれ少量ずつ採取し、常法のSDS−電気泳動より、分子量約28,000ダルトンにバンドが出現する(1分子のインターフェロンα8当り1分子のポリエチレングリコールが結合してなる生理活性複合体を含む)画分、及び、分子量約35,000ダルトンにバンドが出現する(1分子のインターフェロンα8当り2分子のポリエチレングリコールが結合してなる生理活性複合体を含む)画分を選択した。
腫瘍細胞として、ヒト羊膜由来株化細胞U937(JCRB9021)を標的細胞として用いて、細胞増殖抑制効果を調べた。10(v/v)%ウシ胎児血清を含むRPMI1640培地に、1×106個/mlの濃度でU937細胞を播種し、これに、実施例2におけるウイルス感染阻止活性値を指標にして、20乃至10,000IU/mlの範囲で、サンプルとして、実施例1で得た組換え型インターフェロンα8、実施例2で得た組換え型インターフェロンα8に1分子のポリエチレングリコールが結合した生理活性複合体、又は、実施例2で得た組換え型インターフェロンα8に2分子のポリエチレングリコールが結合した生理活性複合体を段階希釈して加え、37℃、5%炭酸ガス雰囲気下で72時間培養した。並行して、サンプルを添加しない系を設け、上記と同様に処理して対照とした。これらを常法に従い、酸化−還元インジケーター(商品名『アラマーブルー』、トレックダイアグノスティク社販売)を用いて、生細胞数を計測し、対照と比較して、生細胞率を下記数式1により算出することにより、細胞増殖抑制効果を調べた。結果を図1に示す。なお、図1中、「●」は組換え型インターフェロンα8、「▲」は1分子の組換え型インターフェロンα8に1分子のポリエチレングリコールが結合した生理活性複合体、及び「■」は1分子の組換え型インターフェロンα8に2分子のポリエチレングリコールが結合した生理活性複合体を示す。
生細胞率(%)=(インターフェロンα存在下での生細胞数/対照の生細胞数)×100
実施例1で得た組換え型インターフェロンα8及び実施例2で得たインターフェロンα8に1分子のポリエチレングリコールが結合した生理活性複合体をそれぞれ、5(v/v)%ウシ胎児血清を含むMEM培地で10,000IU/mlの濃度に調製し、下記表1に示す温度で30分間加熱処理を行った。遠心分離後、培地上清を回収し、それらをFL細胞及びシンドビスウイルスを用いたアッセイ系に供し、残存するウイルス感染阻止活性を測定し、加熱前のウイルス感染阻止活性に対する百分率(残存活性率)を下記数式2により求めた。結果を表1に示す。(表中、「PEG−IFNα8」は、1分子の組換え型インターフェロンα8に、1分子のポリエチレングリコールが結合した本発明の生理活性複合体を、「IFNα8」は、ポリエチレングリコールが結合していない組換え型インターフェロンα8を示す。)
残存活性率(%)=(加熱後のウイルス感染阻止活性/加熱後のウイルス感染阻止活性)×100
BALB/cマウスから採取した血清と、生理食塩水により5μg/mlに希釈した実施例2の方法により得た1分子の組換え型インターフェロンα8に1分子のポリエチレングリコールが結合している生理活性複合体とを体積比4:1の割合で混合し、一定間隔を置いてサンプリングしながら、37℃で9時間インキュベートした。採取したサンプルは、直ちにFL細胞/シンドビスウイルスを用いる常法のバイオアッセイ系によりウイルス感染阻止活性を測定し、インキュベーション前のインターフェロンα活性に対する百分率(残存活性率)を下記数式3に求め、安定性の指標とした。併行して、生理活性複合体に代えて組換え型インターフェロンα8を投与する系をそれぞれ設け、これらを上記と同様に処置して対照とした。結果を表2に示す。
残存活性率(%)=(インキュベーション後のインターフェロンα活性/インキュベーション前のインターフェロンα活性)×100
血中残存率(%)=(各時間後の血中におけるインターフェロンα濃度/投与直後の血中におけるインターフェロンα濃度)×100
常法にしたがって、8週齢の雄性マウス(体重20乃至25g)に実施例2の方法により得た1分子の組換え型インターフェロンαに1分子のポリエチレングリコールが結合した生理活性複合体を経皮、経口又は腹腔経路で注射投与したところ、生理活性複合体のLD50は、いずれの投与経路においても1mg/kg体重以上であった。このことは、この発明の生理活性複合体がヒトへの投与を前提とする医薬品として、又は医薬品に配合して用いることが安全であることを物語っている。
安定剤として1%(w/w)人血清アルブミンを含む生理食塩水に実施例2の方法により得た1分子の組換え型インターフェロンαに1分子のポリエチレングリコールが結合した生理活性複合体を1mg/mlになるように溶解し、常法にしたがって精密濾過して滅菌して液剤を得た。
安定剤として1%(w/w)精製ゼラチンを含む生理食塩水100mlに実施例2の方法により得た1分子の組換え型インターフェロンαに1分子のポリエチレングリコールが結合した生理活性複合体を100mg溶解し、常法にしたがって精密濾過により滅菌し、バイアル瓶に1mlずつ分注し、凍結乾燥させた後、密栓して乾燥注射剤を得た。
滅菌蒸留水にカルボキシビニルポリマー(商品名『ハイビスワコー』、株式会社和光純薬工業販売)と、パイロジェンを除去した高純度トレハロース(登録商標『トレハ』、株式会社林原商事販売)とをそれぞれ濃度1.4%(w/w)及び2.0%(w/w)になるように溶解した後、実施例2の方法により得た1分子の組換え型インターフェロンαに1分子のポリエチレングリコールが結合した生理活性複合体の適量を均一に混合し、pH7.2に調製して、1g当り生理活性複合体を約5μg含むペースト状物を得た。
無水結晶性α−マルトース粉末(登録商標『ファイントース』、株式会社林原商事販売)に実施例2の方法により得た1分子の組換え型インターフェロンαに1分子のポリエチレングリコールが結合した生理活性複合体の適量を均一に混合し、得られた混合物を常法により打錠して製品1錠(約200mg)当り生理活性複合体を約1μg含む錠剤を得た。
摂取性、安定性に優れた本品は、悪性腫瘍、ウイルス性疾患、細菌感染症及び免疫疾患をはじめとする感受性疾患を治療・予防するための錠剤として有用である。
Claims (3)
- 配列表における配列番号1、2又は3に併記されるアミノ酸配列を有する人のインターフェロン−αにおけるサブタイプα8の1分子当たり、モノメトキシN−サクシンイミジルプロピオネートにより活性化させた平均分子量1,000乃至25,000ダルトンのポリエチレングリコールが1分子結合してなる、FL細胞/シンドビスウイルス系を用いて測定したときの比活性が6×107IU/mg蛋白質以上である生理活性複合体。
- 請求項1に記載の生理活性複合体を有効成分とする感受性疾患剤。
- 抗腫瘍剤、抗ウイルス剤又は抗アレルギー剤としての請求項2に記載の感受性疾患剤。
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| PCT/JP2004/016827 WO2005046715A1 (ja) | 2003-11-12 | 2004-11-12 | 生理活性複合体 |
| JP2005515453A JP4866612B2 (ja) | 2003-11-12 | 2004-11-12 | 生理活性複合体 |
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| WO1993016107A1 (en) * | 1992-02-10 | 1993-08-19 | Interferon Sciences, Inc. | Improved alpha interferon composition and method for its production from human peripheral blood leukocytes |
| ES2186714T3 (es) * | 1994-03-07 | 2003-05-16 | Imperial College | Uso de sustipo simple alpha 8 en la preparacion de medicamentos para el tratamiento de infecciones virales del higado. |
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