丙烯腈对大鼠肝脏Ca~(2+)-ATP酶、磷酸化酶A活力的影响

本文通过丙烯腈对大鼠肝脏Ｃａ２＋－ＡＴＰａｓｅ和磷酸化酶Ａ活性影响的研究，探讨了丙烯腈对动物肝脏钙稳态的影响，进一步阐明丙烯腈的毒作用机制。采用成年雄性ＳＤ大鼠，每天经口染毒，染毒剂量为０、１０、３０和５０ｍｇ／ｋｇ，连续染毒４２天，于染毒第１４天、２８天和４２天时分别测定各组肝匀浆Ｃａ２＋－ＡＴＰａｓｅ和磷酸化酶Ａ的活性。结果显示，丙烯腈可明显地抑制肝脏Ｃａ２＋－ＡＴＰａｓｅ（Ｐ＜０．０１），同时可显著地激活磷酸化酶Ａ的活性，特别是高剂量组（５０ｍｇ／ｋｇ）和染毒４２天时影响最明显，相关关系分析表明，丙烯腈对Ｃａ２＋－ＡＴＰａｓｅ和磷酸化酶Ａ的活性的影响均存在较好的剂量－反应和时间－反应关系（Ｐ＜０．０１）。结果认为丙烯腈能显著地抑制大鼠肝脏Ｃａ２＋－ＡＴＰａｓｅ和激活磷酸化酶Ａ的活性，可导致大鼠肝脏钙稳态的失调。

Effect of acrylonitrile on the activity of Ca2+-ATPase and phosphorylase A of liver in rats

The activity of Ca(2+)-ATPase and phosphorylase A(P-A) of liver in rats was determined to study the effect of acrylonitrile (ACN) on calcium homeostasis and to clarify the toxicological mechanism of ACN. Adult male Sprague-Dawley rats were administered ACN daily per os for 42 days, at the dosage of 0, 10, 30 and 50 mg.kg-1. The activities of Ca(2+)-ATPase and phosphorylase A was determined at 14, 28, 42 days after ACN administration. The results indicated that ACN could significantly inhibit the activity of Ca(2+)-ATPase and increase the activity of P-A (P < 0.01), especially in the high dose group and exposed for 42 days, and there was significantly dose- and time-respond relationship (P < 0.01). ACN contamination could result in the disharmony of calcium homeostasis of liver in rats.