The changes of the thyroid function and serum testosterone levels after long-term L-NAME treatment in male rats
Language English Country Italy Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
9624597
DOI
10.1007/bf03347308
Knihovny.cz E-resources
- MeSH
- Pituitary Gland, Anterior drug effects metabolism MeSH
- Estradiol pharmacology MeSH
- Cyclic GMP metabolism MeSH
- Enzyme Inhibitors pharmacology MeSH
- Rats MeSH
- NG-Nitroarginine Methyl Ester administration & dosage pharmacology MeSH
- Rats, Wistar MeSH
- Thyroid Gland drug effects physiology MeSH
- Nitric Oxide Synthase antagonists & inhibitors MeSH
- Testosterone blood MeSH
- Thyrotropin blood MeSH
- Thyroxine blood MeSH
- Animals MeSH
- Check Tag
- Rats MeSH
- Male MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Estradiol MeSH
- Cyclic GMP MeSH
- Enzyme Inhibitors MeSH
- NG-Nitroarginine Methyl Ester MeSH
- Nitric Oxide Synthase MeSH
- Testosterone MeSH
- Thyrotropin MeSH
- Thyroxine MeSH
Nitric oxide is a highly reactive gas that is produced by many tissues and exerts a series of physiological and pathophysiological effects. We studied the changes of the serum testosterone, thyroxine and thyrotropin levels, thyroid and anterior pituitary weights and thyroid cGMP concentrations in male Wistar strain rats treated with estradiol benzoate (EB) (1 mg/kg, im twice a week) and nonselective NO-synthase inhibitor L-NAME (N-omega-nitro-L-arginine methyl ester) alone and with combination of these substances. We have found that L-NAME in a dose 100 mg/kg/day but not in a dose 50 mg/kg/day increased the serum thyroxine and testosterone levels and in the case of testosterone in a higher dose partially blocked its drop when administered simultaneously with EB. The serum thyrotropin levels significantly fell after L-NAME and EB treatment. The cGMP thyroid levels changed only slightly in groups treated EB and L-NAME alone and were significantly decreased in group treated with combination of these substances. The nitric oxide thus seems to be an important modulator of thyroid and testicular function. The cGMP activation cascade is not probably involved in the nitric oxide induced changes of thyroid function.
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