JP2005529099A - 改善された経口生物学的利用能を有するケモカイン変異体 - Google Patents
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Abstract
Description
薬物動態(PK)研究
8〜12週齡のメスBalb/cマウスに、経口(P.O.;経口胃管栄養法)で、5mg/kgのヒトRANTESまたはRANTES(R44AK45AR47A)を投薬した。血液を様々な時点で試料採取し(1群当たりマウスn=3匹)、血清を採取して、内在性のマウスRANTESでなくヒトRANTESまたはヒトRANTES(R44AK45AR47A)を検出するように設定された、ポリクローナル抗ヒトRANTES抗体対(Pharmingen 20581D/20582D)を使用して、ELISAによって変異体ケモカインのPKプロフィールを得た。
8〜12週齡のメスBalb/cマウスに、200μlのビヒクル対照(NaCl)と共に、野生型(WT)またはケモカイン変異体を4時間P.O.(経口胃管栄養法による経口投与)または30分I.P.(腹腔内)で、あらかじめ投薬した。t=0でマウスに、200μlのビヒクル対照(NaCl)、WTまたは変異体ケモカインをI.P.投薬した。18時間後にマウスを屠殺し腹膜洗浄を実施して、血球計算器を使用して採取した全細胞を計えた。
腹膜洗浄からの全総細胞数を群の平均と共に、個々の数として表した。グラフパッド(GraphPad)からのボンフェローニ事後検定付き一方向ANOVA(バージョン3.0;プリズムソフトウェア(Prism software))を使用して、統計的有意性を計算した。このようにして計算されたp<0.05の値は、タンパク質または投薬によって提供される効果における統計学的有意差を示す(図中に*で表す)。
体重18〜22gの8週齡のC57BL/6NCrlBRメスマウスに、0.25mgの結核菌を含有するフロイント完全アジュバント(CFA、マイコバクテリウム・ブチリカム(Mycobacterium butyricum)、ディフコ(Difco))中の200μgのミエリン乏突起膠細胞糖タンパク質33〜35(MOG35〜55)ペプチド(ネオシステム)を含有する、0.1mlのエマルジョンを注射して免疫付与した(日数=0;首の後ろに皮下注射)。皮下注射前に、マウスは尾静脈に、リン酸緩衝食塩水(PBS)に溶解した300ngの百日咳毒素(リスト・バイオロジカル・ラブ(List Biological Lab.))の200μlの静脈内注射を受けた。2日目に、実験動物にPBS中300ngの百日咳毒素の2回目の腹腔内注射をした。この手順により、ほぼ8〜10日目に始まって、尾から生じて前肢にまで進行性に上昇する進行性麻痺の発現がもたらされた。
群1:I.P.経路でビヒクル(200μlPBS)を単独で投薬された陽性対照群。
群2:P.O.経路でビヒクル(200μlPBS)を単独で投薬された陽性対照群。
群3:10μg/マウスのRANTES(R44AK45AR47A)を含む200μl/マウスのPBSをI.P.投薬。
群4:100μg/マウスのRANTES(R44AK45AR47A)を含む200μl/マウスのPBSをp.o.投薬。
群5:20,000U/マウスのマウス組換えインターフェロンβ(IFNβ)を含む200μl/マウスのPBSをS.C.(皮下)投薬。
0=疾患の徴候なし
0.5=部分的尾麻痺
1=尾麻痺
1.5=尾麻痺+部分的片側性後肢麻痺
2=尾麻痺+後肢脱力または部分的後肢麻痺
2.5=尾麻痺+部分的後肢麻痺(骨盤の低下)
3=尾麻痺+完全な後肢麻痺
3.5=尾麻痺+完全な後肢麻痺+失禁
4=尾麻痺+後肢麻痺+前肢の脱力または部分的麻痺
5=瀕死または死亡
P.O.投与に続く血清中RANTES(R44AK45AR47A)の検出
経口投与に続いて血清中にRANTES(配列番号:10)およびRANTES(R44AK45AR47A)(配列番号:1)の双方が検出された。特にRANTES(R44AK45AR47A)が、用量100μg/マウスでP.O.投与した場合、P.O.投与(表2;nd=検出されず)の4時間後、ELISAによって実験動物の血清中に5.86ng/ml血清のピークレベルで検出された。このピークは明らかに、30分でピークが得られたその他の投与系(血管内のまたは腹腔内)に比べると遅延している。
マウスにあらかじめRANTESをI.P.投薬し、腹膜細胞の収率をベースラインとの比較でおよそ2倍に増大させた。RANTES(R44AK45AR47A)は、腹腔内に投与すると細胞を動員できないが、腹腔内にも投与すればRANTESの拮抗剤として活性である(図2A)。変異体RANTES(R44AK45AR47A)およびRANTES(K45E)(配列番号:5)を経口的(図2Bおよび2C)に投与した場合、RANTES誘発動員の用量依存性阻害も観察された。
RANTES(R44AK45AR47A)は、経口的に投与すると多発性硬化症のマウスEAEモデルにおいて有益な効果を示す。タンパク質は、100μg/マウス/日のP.O.投与で、基準治療(組換えマウスIFN−β)よりも良い有効性を実証した。実験中に達した最大臨床スコアの平均値も低下した(図4)。これらの結果は、マウスにおいてMOGでの免疫付与後に慢性EAEの臨床徴候を減少させるという、RANTES(R44AK45AR47A)の経口投与の明らかな有益な効果を示す。したがってMSなどの慢性脱髄性疾患において、治療また予防のためにRANTES(R44AK45AR47A)を経口的に投与できる。
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Claims (5)
- 経口投与によって自己免疫性および炎症性疾患、並びに細菌およびウイルス感染症を治療または予防するための医薬組成物を製造するためのRANTES、MIP−1α、MIP−1β、および対応する野生型(WT)分子と少なくとも90%の相同性を有するそれらの突然変異タンパク質の中から選択された、40番台の二塩基性部位に少なくとも1つの非保存性突然変異を含む変異体C−Cケモカインの使用。
- 前記突然変異タンパク質が、対応するWT分子と95%〜99%の相同性を有する、請求項1に記載の使用。
- 前記変異体が40番台の二塩基性部位の位置の少なくとも1つに、アラニンまたはグルタミン酸を含有する、請求項1または2に記載の使用。
- 前記突然変異タンパク質が配列番号1、2、3、4、5、6、7、8、および9からなる群より選択されるアミノ酸配列を含む、請求項1〜3のいずれか一項に記載の使用。
- 前記突然変異タンパク質が配列番号1のアミノ酸配列を有し、前記自己免疫性疾患が多発性硬化症である、請求項1〜4のいずれか一項に記載の使用。
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