Regulation of perfluorooctanoic acid--induced peroxisomal enzyme activities and hepatocellular growth by adrenal hormones.

Regulation of perfluorooctanoic acid--induced peroxisomal enzyme activities and hepatocellular growth by adrenal hormones.
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肾上腺激素对全氟辛酸诱导的过氧化物酶体酶活性和肝细胞生长的调节。

DOI:
10.1002/hep.1840150223
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发表时间:
1992
期刊:
Hepatology (Baltimore, Md.)
影响因子:
--
通讯作者:
Badr,M
Badr,M
中科院分区:
--
文献类型:
--
作者:
Thottassery,J;Winberg,L;Youssef,J;Cunningham,M;Badr,M

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已发现多种化合物,包括降血脂药物、增塑剂和其他工业化学品,可导致肝脏肿大和肝过氧化物酶体增殖,其机制尚不清楚。尽管甲状腺激素和性激素已被证明可以调节肝脏对这些化学物质的反应,但肾上腺激素在这些现象中的作用尚不清楚,并且一些研究得出了相互矛盾的数据。因此,本研究旨在调查肾上腺激素在过氧化物酶体增殖物引起的肝肿大和过氧化物酶体酶诱导中的作用,并进一步描述这些参数之间的相互关系。由于肾上腺切除术改变了肝脏药物代谢,因此我们使用了不可代谢的增殖剂全氟辛酸。我们的数据表明,全氟辛酸引起的肝肿大取决于啮齿动物中主要的糖皮质激素皮质酮。由全氟辛酸引起的肝脏生长似乎主要是肥大性的,并且响应于全氟辛酸的DNA合成主要在肝小叶的门静脉周围区域。数据还表明,虽然全氟辛酸诱导过氧化物酶体β-氧化与肾上腺激素无关,但过氧化氢酶的诱导依赖于这些激素的存在。这项研究支持这样的论点:各种过氧化物酶体酶的活性诱导是由不同的调节机制控制的。
A wide variety of compounds, including hypolipidemic drugs, plasticizers and other industrial chemicals, have been found to cause liver enlargement and hepatic peroxisome proliferation by mechanisms that are unclear. Although thyroid and sex hormones have been shown to modulate the hepatic response to these chemicals, the role of adrenal hormones in these phenomena is not clear, and a few studies have produced conflicting data. Therefore this study was undertaken to investigate the role of adrenal hormones in hepatomegaly and peroxisomal enzyme induction caused by peroxisomal proliferators and to further delineate the interrelationship between these parameters. Because adrenalectomy alters hepatic drug metabolism, we have used the nonmetabolizable proliferator perfluorooctanoic acid. Our data show that hepatomegaly caused by perfluorooctanoic acid depends on corticosterone, the major glucocorticoid in rodents. Liver growth caused by perfluorooctanoic acid appears to be predominantly hypertrophic in nature, and DNA synthesis in response to perfluorooctanoic acid predominates in periportal regions of the liver lobule. Data also show that although induction of peroxisomal β‐oxidation by perfluorooctanoic acid is independent of adrenal hormones, induction of catalase is dependent on the presence of these hormones. This study supports the contention that induction of activities of various peroxisomal enzymes is controlled by different regulatory mechanisms.
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