イノシトール三リン酸によって媒介されるカルシウム波の細胞間伝播
S Boitano1, E R Dirksen, M J Sanderson
1Department of Anatomy, UCLA School of Medicine, CA 90024.
まとめ
イノシトール1,4,5-トリフォスファート (IP3) の放出は,呼吸道上皮細胞における細胞間カルシウム (Ca2+) 波の伝播に不可欠である. このシグナル伝達メカニズムは,IP3がギャップ・ジャンクションを通過し,広まらないCa2+振動とは異なる.
科学分野:
- 細胞生物学 細胞生物学
- バイオフィジックス 生物物理学
- 生理学 生理学とは
背景:
- カルシウム (Ca2+) のシグナル伝達パターンは,細胞間Ca2+波の伝播と細胞内Ca2+振動 ([Ca2+]i) の非伝播という2つの異なるパターンがある.
- これらのCa2+シグナリングタイプを区別するメカニズムを理解することは,細胞通信研究にとって不可欠です.
研究 の 目的:
- 細胞間Ca2+波と細胞内Ca2+振動の差分伝播の分子基礎を調査する.
- 細胞間Ca2+波の伝播におけるイノシトール1,4,5-トリフォスファート (IP3) 信号伝達の役割を決定する.
主な方法:
- 呼吸道上の上皮細胞は,パルス式,高周波電極穿孔を用いて,IP3受容体アンタゴニストであるヘパリンで治療した.
- 細胞内Ca2+ダイナミクスは,ヘパリンとタプシガージン (Ca2+ポンプ阻害剤) の存在と不在で監視されました.
主要な成果:
- ヘパリン治療は特に細胞間Ca2+波の伝播を阻害し,Ca2+振動は影響を受けなかった.
- Ca2+波の伝播は,コントロール条件下で[Ca2+]i振動を示す細胞を通して発生した.
- タプシガージンを用いた細胞内Ca2+貯蔵庫の枯渇により,Ca2+波の伝播も廃止された.
結論:
- イノシトール1,4,5-トリフォスファート (IP3) 媒介によるカルシウム放出は,細胞間Ca2+波の伝播の前提条件である.
- この発見は,IP3が信号分子の役割を果たし,ギャップ・ジャンクションを通過して細胞間Ca2+波の通信を媒介することを示唆しています.
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