人間における頭上傾き時の筋肉間静止カルシウム
Soraya Samii1, Mazhar H Khan, David A MacLean
1Division of Cardiology, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center, Hershey, Pa 17033, USA.
Circulation
|December 24, 2003
まとめ
ヘッド・アップ・ティルト (HUT) は,神経血管空間における細胞外カルシウム ([Ca2+]o) を増加させ,外周血管収縮を引き起こす可能性がある. この研究では,ヒトのHUT中に[Ca2+]oの変化を in situで測定しました.
科学分野:
- 生理学 生理学とは
- 神経血管医学は神経血管医学である.
- 心血管研究 循環器科の研究
背景:
- ヘッド・アップ・ティルト (HUT) のとき,外周血管収縮は不可欠です.
- 交感性神経末端と血管の滑らかな筋肉細胞のコミュニケーションは,この反応にとって極めて重要です.
- これらの細胞の活性化と機能には,細胞外カルシウム ([Ca2+]o) が必要です.
研究 の 目的:
- HUT中に細胞外カルシウム ([Ca2+]o) レベルが上昇するという仮説を検証する.
- 外周血管収縮を媒介する[Ca2+]oの上昇の潜在的な役割を調査する.
主な方法:
- 10人の健康な被験者の下肢の骨格筋に微小透析技術を使用した.
- ヘッド・アップ・ティルト (HUT) 時の神経血管空間における細胞外カルシウム ([Ca2+]o) 濃度を in situ で測定した.
主要な成果:
- HUTの間,透析物 [Ca2+] の有意な62%の増加が観察されました.
- 測定された[Ca2+]o濃度は0.223+/-0.018から0.353+/-0.028mmol/Lに上昇した.
- これは,HUT中にヒトにおけるin situ [Ca2+]o測定に関する最初の報告です.
結論:
- 発見は,HUT中に神経血管空間[Ca2+]oが大幅に上昇することを示しています.
- この[Ca2+]oの増加は,細胞間の相互作用を促進し,血管収縮を促進する可能性があります.
- この [Ca2+] 変異体が神経末端と血管の滑らかな筋肉細胞に与える特定の効果を明らかにするために,さらなる研究が必要である.
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