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  • 期刊

Antagonizing Effects of Type I Antifreeze Protein on Ca^++ Uptake in Fish TO-2 Cells

第一型抗凍蛋白對魚類TO-2細胞鈣離子吸收之拮抗作用

摘要


在許多極地魚類身上所發現的抗凍蛋白或醋蛋白, 具有防止魚類在冰凍的海水中結凍的能力,所以被視為拮抗劑。本報告是研究抗凍蛋白對魚類T O-2細胞鈣離子流動的作用。結果發現,第一型抗凍蛋白能抑制鈣離子之吸收,且其抑制作用隨施用之濃度升高而增加, 但它卻不能拮抗鈣離子的釋放。相反的,第三型抗凍蛋白則對鈣離子流動沒有任何影響。另外,我們也發現在TO-2細胞的培養液中添加一些鈣離子拮抗物,如La^+++ (LaCI3)、Co^++ (CoCI2)、或verapamil(L-型鈣離子通道抑制劑),並不會加強第一型抗凍蛋白對鈣離子吸收的抑制,此結果顯示第一型抗凍蛋白應是一個非專一性的鈣離子吸收抑制劑。

並列摘要


The antifreeze proteins (AFPs) or glycoproteins in several species of polar fish, which prevent the fish from being frozen in icy seawater, have been suggested for use as cryoprotective agents. The present study examines the effect of AFPs on Ca^++ flux in a fish TO-2 cell line. The results indicate that type I AFP inhibits the uptake of Ca^++ in a dose-dependent manner, but it does not antagonize the release of Ca^++. By contrast, type III AFP shows no effect on Ca^++ flux. The addition of calcium antagonists, La^+++ (LaCl3), Co^++ (CoCl2), or verapamil (L-type Ca^++ channel blocker), to the uptake medium did not further enhance the blocking effect of AFP on Ca^++ uptake, indicating that type I AFP is a non-selective Ca^++ blocker.

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