- HOME
- > 一般の方
- > バックナンバー:神奈川歯学
- > 24巻3号
- > アブストラクト
アブストラクト(24巻3号:神奈川歯学)
Japanese
Title : | 咬筋小胞体カルシウム輸送系に対するCompound 40 / 80 の効果 |
---|---|
Subtitle : | 原著 |
Authors : | 小田島千里, 伊藤春生 |
Authors(kana) : | |
Organization : | 神奈川歯科大学歯科薬理学教室 |
Journal : | 神奈川歯学 |
Volume : | 24 |
Number : | 3 |
Page : | 431-439 |
Year/Month : | 1989 / 12 |
Article : | 原著 |
Publisher : | 神奈川歯科大学学会 |
Abstract : | 「緒言」咬筋から単離された筋小胞体(SR)によるATP依存性Ca2+ uptakeは, 心筋同様Ca2+によって活性化されるATP加水分解と化学量論的に強く共役している. しかし, Okabe et al. は心筋SRを用いた場合, calmodulin依存性反応を抑制することでCa2+ uptakeとATP加水分解との共役がはずれることを見い出し, これをcalmodulin制御性Ca2+ チャンネルからのCa2+ 放出増大の結果であると推測した. 細胞機能のCa2+ 依存性反応過程の制御に果たすcalmodulinのセカンドメッセンジャーとしての役割について, 広範な研究が展開されている. Ca2+ 存在下でcalmodulinは, phosphodiesterase, adenylate cyclase, ミオシン軽鎖kinase, および赤血球や心臓の細胞膜Ca2+, Mg2+ -ATPase, など多くの酵素系を制御しており, とくに, 細胞内Ca2+ 濃度を一定に維持するための細胞膜を介する能動的Ca2+ 押し出し機構(Ca2+ ポンプ)の活性化に密接に関与している. |
Practice : | 歯科学 |
Keywords : | 咬筋小胞体, compound 48/80, calmodulin, Ca2+ permeability, Ca2+ チャンネル |
English
Title : | Effect of Compound 48 / 80 on Masseter Muscle Sarcoplasmic Reticulum Calcium Transport System |
---|---|
Subtitle : | Original article |
Authors : | Chisato ODAJIMA, Haruo Ito |
Authors(kana) : | |
Organization : | Department of Pharmacology, Kanagawa Dental College |
Journal : | Kanagawa Shigaku |
Volume : | 24 |
Number : | 3 |
Page : | 431-439 |
Year/Month : | 1989 / 12 |
Article : | Original article |
Publisher : | Kanagawa Odontological Society |
Abstract : | Abstract : To define the role of calmodulin in Ca2+ fluxes behavior of canine masseter muscle sarcoplasmic reticulum (SR) vesicles, the effect of condensation product of N-methyl-p-methoxyphenethylamine with formaldehyde (compound 48/80), a selective and powerful inhibitor of calmodulin-regulated function, on Ca2+ -ATPase activity, oxalate-supported Ca2+ uptake velocity, and on interaction with Ca2+ permeability and Ca2+ loading at steady-state were evaluated. Compound 48/80, at concentrations of 10 to 100μg/ml, reduced oxalate-supported Ca2+ uptake velocity without affecting Ca2+ -ATPase activity. In the presence of 10μg/ml compound 48/80, there was a sift of pH- or temperature-response curve of oxalate-supported Ca2+ uptake velocity, but not of Ca2+ -ATPase activity, down. It was found that Arrhenius plots of the Ca2+ -ATPase activity show a break at about 21°C in the presence or absence of 10μg/ml compound 48/80, and that compound 48/80 has no effect on Arrhenius plots of the oxalate-supported Ca2+ uptake velocity. Furthermore, Ca2+ loading at steady-state, but not passive Ca2+ permeability, was decreased by compound 48/80 at low concentrations (1-2μg/ml). The results of this study suggest that calmodulin-dependent process plays a functional role in the coupling of ATP hydrolysis and Ca2+ accumulation, perhaps through regulation of Ca2+ release channels in masseter muscle SR membrane. Calmodulin-dependent component of Ca2+ fluxes in the SR vesicles may be directly modified by compoumd 48/80, thereby diminishing Ca2+ accumulation without affecting the Ca2+ uptake mechanism. |
Practice : | Dentistry |
Keywords : |