Selenium-induced alteration of lipids,lipid peroxidation,and thiol group in circadian rhythm centers of rat |
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Authors: | Islam Fakhrul Zia Suhaila Sayeed Iqbal Zafar Khan Shoeb Ahmad Abdullah Shafique |
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Institution: | (1) Neurotoxicology Laboratory, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, 110 062 New Delhi, India |
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Abstract: | The effect of sodium selenite (0.05, 0.1, and 0.2 mg/kg body weight, ip) on the contents of lipids (phospholipids, cholesterol,
esterified fatty acids, gangliosides), thiobarbituric acid reactive substance (TBARS), and thiol group in circadian rhythm
centers (preoptic area, brainstem, and posterior hypothalamus) of male Wistar rats was studied after 7 d of treatment. The
content of phospholipids was elevated significantly with a dose of 0.1 mg/kg of selenite in the preoptic area and brainstem,
but a 0.2-mg/kg dose has depleted its level significantly in these regions. The alteration of phospholipids in posterior hypothalamus
was not significant with three doses of sodium selenite. The level of cholesterol in the preoptic area was inhibited significantly
with a dose of 0.05 mg/kg sodium selenite, but its level was elevated significantly with a dose of 0.2 mg/kg selenite in the
preoptic area and brainstem. Alteration with three doses of sodium selenite in the posterior hypothalamus was not significant.
The ganglioside level in the preoptic area and brainstem was elevated significantly with a 0.1-mg dose of sodium selenite;
conversely, a 0.2 mg dose of sodium selenite caused a significant depletion on its content in these areas. In the posterior
hypothalamus, the ganglioside level was depleted significantly with a dose of 0.1 mg, but elevated significantly with a dose
of 0.2 mg of sodium selenite. The level of esterified fatty acids was decreased significantly in the preoptic area and brainstem
with a dose of 0.1 mg/kg sodium selenite, but in these regions, its level was elevated with a dose of 0.2 mg/kg sodium selenite
and its elevation was significant in the preoptic area. In the posterior hypothalamus, the alteration of esterified fatty
acids with three doses of sodium selenite was not significant. The effect of 0.1 and 0.2 mg/kg sodium selenite on the TBARS
level and thiol group in sleep centers was significantly opposite to the wakefulness center. A sodium selenite dose of 0.1
mg/kg had depleted the content of TBARS in the preoptic area and brainstem but elevated the content of the thiol group significantly
in the posterior hypothalamus. On the other hand, a 0.2-mg/kg dose of sodium selenite has significantly elevated the content
of TBARS but depleted the content of the thiol group significantly in the posterior hypothalamus. No dose-dependent alteration
was observed on the content of lipids, TBARS, and thiol group in the circadian rhythm centers of rats. |
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Keywords: | Selenium brain lipids thiobarbituric acid reactive substance thiol group preoptic area brainstem posterior hypothalamus |
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