首页> 外文OA文献 >Dual effect of fluoride on phosphoinositide metabolism in rat brain cortex. Stimulation of phospholipase C and inhibition of polyphosphoinositide synthesis.
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Dual effect of fluoride on phosphoinositide metabolism in rat brain cortex. Stimulation of phospholipase C and inhibition of polyphosphoinositide synthesis.

机译:氟化物对大鼠大脑皮层磷酸肌醇代谢的双重作用。刺激磷脂酶C和抑制多磷酸肌醇合成。

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摘要

We have studied the effects of fluoride, guanosine 5'-[gamma-thio]triphosphate (GTP[S]) and carbachol on phospholipase C and polyphosphoinositide synthesis. The experimental system consisted of membranes from rat brain cortex, with exogenous [3H]phosphatidylinositol ([3H]PtdIns) as substrate. In such systems, we have not found evidence to support carbachol and/or GTP[S] stimulation of PtdIns phosphorylation. Fluoride inhibited synthesis of PtdIns4P and PtdIns(4,5)P2 from PtdIns. Consequently, under conditions where breakdown of polyphosphoinositides by phospholipase C was dependent on PtdIns kinase activity, fluoride inhibited activation by GTP[S] plus carbachol of phospholipase C. When conditions allowed direct breakdown of PtdIns and precluded PtdIns kinase activity, the stimulatory effects of fluoride and GTP[S] plus carbachol on phospholipase C activity were additive.
机译:我们研究了氟化物,鸟苷5'-γ-硫代三磷酸(GTP [S])和卡巴胆碱对磷脂酶C和多磷酸肌醇合成的影响。实验系统由大鼠大脑皮层的膜组成,外源性[3H]磷脂酰肌醇([3H] PtdIns)为底物。在这样的系统中,我们还没有发现证据支持卡巴胆碱和/或GTP [S]刺激PtdIns磷酸化。氟化物抑制了PtdIns合成PtdIns4P和PtdIns(4,5)P2。因此,在磷脂酶C分解多磷酸肌醇依赖于PtdIns激酶活性的条件下,氟化物抑制了GTP [S]加磷脂酶C的卡巴胆碱的活化。当条件允许PtdIns直接分解并阻止了PtdIns激酶活性时,氟化物的刺激作用GTP [S]加卡巴胆碱对磷脂酶C的活性具有累加性。

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