2,3,7,8-Tetrachlorodibenzo-p-dioxin induced alterations of pyruvate carboxylase levels and lactate dehydrogenase isozyme shifts in C57BL/6J male mice.

2,3,7,8-Tetrachlorodibenzo-p-dioxin induced alterations of pyruvate carboxylase levels and lactate dehydrogenase isozyme shifts in C57BL/6J male mice.
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2,3,7,8-四氯二苯并-对二恶英诱导 C57BL/6J 雄性小鼠丙酮酸羧化酶水平的改变和乳酸脱氢酶同工酶的变化。

DOI:
10.1002/jbt.2570090608
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发表时间:
1994
期刊:
Journal of biochemical toxicology
影响因子:
--
通讯作者:
Schaup,HW
Schaup,HW
中科院分区:
--
文献类型:
--
作者:
Sparrow,BR;Thompson,CS;Ryu,BW;Selevonchick,DP;Schaup,HW

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在玉米油载体中给予2,3,7,8 -四氯二苯并-对二恶英(TCDD)后,C57BL/6J雄性小鼠肝脏丙酮酸羧化酶水平和活性呈剂量依赖性降低。剂量范围为1 ~ 75 μg/kg体重,注射后8 d进行分析。在研究的最大TCDD水平下,我们发现丙酮酸羧化酶活性降低了10倍。此外,1 μg/kg体重剂量的TCDD可阻断玉米油诱导肝蛋白提取物中丙酮酸羧化酶数量的增加。当剂量超过启动丙酮酸羧化酶减少所需的剂量时,乳酸脱氢酶同工酶模式发生变化。这伴随着血乳酸水平的增加。我们认为TCDD介导的丙酮酸羧化酶和乳酸脱氢酶同工酶的减少可能是TCDD毒性的主要组成部分。
A dose‐dependent reduction of hepatic pyruvate carboxylase levels and activity occurs in C57BL/6J male mice given 2,3,7,8‐tetrachlorodibenzo‐p‐dioxin (TCDD) i.p. in a corn oil carrier. The dose range was from 1 to 75 μg/kg body weight and the analysis was done 8 days postinjection. At the maximum TCDD level investigated, we found a 10‐fold reduction in pyruvate carboxylase activity. Furthermore, TCDD at a dose of 1 μg/kg body weight blocks corn oil induction of an increase in the amount of pyruvate carboxylase in liver protein extracts. At doses beyond those required to initiate a reduction in pyruvate carboxylase, lactate dehydrogenase isozyme patterns shift. This is accompanied by an increase in blood lactic acid levels. We propose that TCDD‐mediated reduction in pyruvate carboxylase and lactate dehydrogenase isozyme shifts may represent a major component in TCDD toxicity.
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