Alterations of Phospholipase C Isozymes in Rat Cerebral Cortex through Hyperoxia

抄録

The effect of hyperoxia on the level of three phospholipase C (PLC) isozymes (β1, γ1, δ1) was assessed in the rat cerebral cortex. When the rats were exposed to 100% oxygen for 60 h, there was a significant reduction in the catalytic activity of low molecular weight phosphotyrosine phosphatase, which was susceptible to activity loss under oxidative stress. The result suggests that oxidative stress is induced in the rat cerebral cortex through hyperoxia. The protein levels of PLC-β1 and -δ1 were significantly increased in the cerebral cortex where oxidative stress had been induced, although that of PLC-γ1 was not altered. There was no significant difference in the total PLC activity of the cerebral cortex between hyperoxia and control rats. Using gel filtration chromatography, it was revealed that the PLC-β1 activity in the cerebral cortex of the hyperoxia rats was higher than that in the control rats, but the PLC-δ1 activity in the former did not differ from that in the latter, despite an increase in the PLC-δ1 protein level. These findings suggest that the PLC-β1 and -δ1 protein levels of brain tissues are increased by oxidative stress, and that the increased PLC-δ1 molecule is less active.