JP2010096618A - 脳血管障害又は心血管障害の診断及び治療薬 - Google Patents
脳血管障害又は心血管障害の診断及び治療薬 Download PDFInfo
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Abstract
【解決手段】動物細胞における肝臓型脂肪酸結合蛋白の発現に対する被験物質の増強作用を検定することを特徴とする脳血管障害又は心血管障害の予防治療薬のスクリーニング方法。
【選択図】なし
Description
また本発明は、動物細胞における肝臓型脂肪酸結合蛋白の発現に対する被験物質の増強作用を検定することを特徴とする脳血管障害又は心血管障害の予防治療薬のスクリーニング方法を提供するものである。
さらに本発明は、近位尿細管細胞における肝臓型脂肪酸結合蛋白の発現を増強する作用を有する薬物を有効成分とする脳血管障害又は心血管障害の予防治療薬を提供するものである。
受精卵への遺伝子導入:
ヒトL−FABP蛋白の全翻訳領域と遺伝子転写調節領域を含む、ヒトL−FABP染色体遺伝子を導入したトランスジェニックマウス(hL−FABP−Tgマウス)を作製するため、13週齢以上のBCF1系マウスを不妊交配用及び自然交配用に、10週齢以上のICR系マウスを胚移植用及び里親用に、8週齡以上のBCF1マウスを採卵用にそれぞれ用いた。採卵用雌マウスにPMSG(帝国臓器、妊馬血清性性腺刺激ホルモン)およびhCG(帝国臓器、ヒト絨毛性性腺刺激ホルモン)を腹腔内投与し、過剰排卵誘発後、交配用雄マウスと交配後、受精卵を得た。導入DNA溶液を調整後、卵への遺伝子導入は、受精卵前核に導入遺伝子1,000コピー/plを注入し、偽妊娠雌マウスの卵管内へ移植した。 これにより得られるトランスジェニックマウス(B6C3F1系)について、BALB/cAマウスと戻し交配を行い、hL−FABP−Tgマウスを作製した。
ヒトL-FABP遺伝子導入マウスの判別は、genomic PCRにより判定した。3週齡のマウスの尾からProteinase K処理(メルク)によってgenomic DNAを精製した。各マウスのgenomic DNAを下記primerを用いてgenomic PCRを行い、遺伝子導入の有無を判定した。
プライマー DNA配列
g-1 5'- CTATTCGAAGGGAAGGGAGC -3'(配列番号1)
g-2 5'- CAATAGAGCTCCCTCTTCAC -3'(配列番号2)
10〜12週齢のL-FABP Tgマウス (Tg)(N=38)及び野生型マウス(WT)(n=14)を用い、吸入麻酔下で左中大脳動脈をナイロン糸栓子による60分閉塞を行った後、再灌流を施行した。 再灌流3および7日後に脳を取り出し、経時的にTTC染色にて梗塞巣のサイズを検討した。
方法としては、再灌流後3及び7日後にマウスの脳を1mmずつスライスし(coronal brain sections)、0、2%のTTC溶液(10mL)の中で、20分間(室温)反応させた。 図2に示すように、野生型の脳と比較して、L-FABP Tgマウスの梗塞巣(白い部分)が大幅に減少していることが確認でき、Tgマウスにおける脳浮腫を伴う梗塞巣の拡がりが、WTに比べて極端に抑制され、重症化を免れたことによると考えられた。
本発明のTgマウスにおけるL−FABPは、近位尿細管にのみ選択的に発現していることから、近位尿細管上にL−FABPを強発現させることにより、脳梗塞の拡がりを極端に抑制することができることがはじめて示された。
Claims (6)
- 肝臓型脂肪酸結合蛋白の発現量を測定することを特徴とする脳血管障害又は心血管障害の程度又は進展の評価方法。
- 発現量の測定が、尿中の肝臓型脂肪酸結合蛋白量の測定である請求項1記載の評価方法。
- 動物細胞における肝臓型脂肪酸結合蛋白の発現に対する被験物質の増強作用を検定することを特徴とする脳血管障害又は心血管障害の予防治療薬のスクリーニング方法。
- 動物細胞が、近位尿細管細胞である請求項3記載のスクリーニング方法。
- 近位尿細管細胞における肝臓型脂肪酸結合蛋白の発現を増強する作用を有する薬物を有効成分とする脳血管障害又は心血管障害の予防治療薬。
- 脳血管障害又は心血管障害が、脳梗塞及びもやもや病から選ばれるものである請求項5記載の予防治療薬。
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