Protein kinase C activation inhibits stress‐induced synthesis of heat shock protein 27 in osteoblast‐like cells: Function of arachidonic acid-猫眼课题宝

蛋白激酶 C 激活抑制应激诱导的成骨细胞样细胞中热休克蛋白 27 的合成：花生四烯酸的功能

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1996

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A. Suzuki;O. Kozawa;Y. Oiso;Kanefusa Kato

Exposure of osteoblast‐like MC3T3‐E1 cells to sodium arsenite (arsenite) increased the level of heat shock protein 27 (hsp27). The effect of arsenite was dose‐dependent in the range of 50 to 200 μM. Arsenite also stimulated arachidonic acid release dose‐dependently in the range between 50 and 200 μM in these cells. Both indomethacin, an inhibitor of cyclooxygenase, and nordihydroguaiaretic acid, a lipoxygenase inhibitor, significantly enhanced the arsenite‐induced accumulation of hsp27. Melittin, an activator of phospholipase A2, significantly enhanced the arsenite‐induced accumulation of hsp27. 12‐O‐Tetradecanoylphorbol‐13‐acetate (TPA), a protein kinase C (PKC)‐activating phorbol ester, inhibited the arsenite‐induced accumulation of hsp27. In contrast, 4α‐phorbol 12, 13‐didecanoate (4α‐PDD), a PKC‐nonactivating phorbol ester, had little effect. TPA suppressed the arsenite‐induced arachidonic acid release, but 4α‐PDD had little effect. Arsenite no longer affected cAMP accumulation, inositol phosphates formation nor the formation of choline and phosphocholine in these cells. These results suggest that the response to stress of hsp27 is coupled with the metabolic activity of the arachidonic acid cascade, and the activation of PKC inhibits the induction of hsp27 through the suppression of arachidonic acid release in osteoblast‐like cells. © 1996 Wiley‐Liss, Inc.