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ニフェディピンは,血管の滑らかな筋肉の細胞に依存した経路経由で,内皮細胞におけるスーパーオキシドディスミュータゼ発現を間接的に上調する
Keisuke Fukuo1, Jin Yang, Osamu Yasuda
1Department of Geriatric Medicine, Osaka University Medical School, Suita, Osaka, Japan. fukuo@geriat.med.osaka-u.ac.jp
Circulation
|July 18, 2002
まとめ
ニフェディピンのようなカルシウム対抗薬は,内皮細胞 (ECs) のスーパーオキシドディスミュータゼ (SOD) を増加させることで内皮機能を改善します. この効果は,血管内皮成長因子 (VEGF) を放出する血管滑らかな筋肉細胞 (VSMC) によって媒介されます.
科学分野:
- 心血管研究 循環器科の研究
- 内皮細胞生物学 内皮細胞生物学
- 滑らかな筋肉の細胞機能
背景:
- カルシウムアンタゴニストは,心血管疾患における内皮機能不全を改善することが知られている.
- 内皮細胞におけるカルシウムアンタゴニストの特定の受容体は未だに特定されていない.
- 血管の滑らかな筋肉細胞 (VSMCs) は,内皮細胞 (ECs) に対するカルシウムアンタゴニストの効果を媒介すると仮定されています.
研究 の 目的:
- VSMCsが,内皮のスーパーオキシドディスミュータゼ (SOD) の活性およびカルシウム抗体ニフェディピンによる発現の調節を媒介するかどうかを調査する.
- この過程における血管内皮成長因子 (VEGF) の役割を明らかにする.
主な方法:
- ECとVSMCのコカルチャー研究.
- カルシウム抗体であるニフェディピンによる治療.
- SODの活動と発現の測定.
- 血管内皮成長因子 (VEGF) 生産の評価.
- ブラジキニンB2受容体アンタゴニスト (HOE-140) とVEGF中和抗体の使用.
主要な成果:
- ニフェディピンは,VSMCと共培養されたとき,ECのSOD発現と活性を調節したが,単独培養ではそうではなかった.
- ニフェディピンは,VSMCからVEGFの産生を刺激し,HOE-140によってブロックされました.
- VEGF中和抗体は,ECにおけるニフェディピン誘発のSODアップレギュレーションを阻害した.
- 再結合VEGFは,ECsでSOD発現を増加させた.
- VSMCのスーパーナタントは,SODに依存する効果であるECの酸化窒素 (NO) 産生を高めました.
結論:
- カルシウムの抗体であるニフェディピン (nifedipine) は,内皮のSOD発現を間接的に上調する.
- このアップレギュレーションは,隣接するVSMCからのVEGF刺激によって媒介されます.
- これらの発見は,心血管疾患におけるカルシウム対抗剤の有益なメカニズムについての洞察を提供します.
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