The changes of the thyroid function and serum testosterone levels after long-term L-NAME treatment in male rats
Jazyk angličtina Země Itálie Médium print
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
9624597
DOI
10.1007/bf03347308
Knihovny.cz E-zdroje
- MeSH
- adenohypofýza účinky léků metabolismus MeSH
- estradiol farmakologie MeSH
- guanosinmonofosfát cyklický metabolismus MeSH
- inhibitory enzymů farmakologie MeSH
- krysa rodu Rattus MeSH
- NG-nitroargininmethylester aplikace a dávkování farmakologie MeSH
- potkani Wistar MeSH
- štítná žláza účinky léků fyziologie MeSH
- synthasa oxidu dusnatého antagonisté a inhibitory MeSH
- testosteron krev MeSH
- thyreotropin krev MeSH
- thyroxin krev MeSH
- zvířata MeSH
- Check Tag
- krysa rodu Rattus MeSH
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- estradiol MeSH
- guanosinmonofosfát cyklický MeSH
- inhibitory enzymů MeSH
- NG-nitroargininmethylester MeSH
- synthasa oxidu dusnatého MeSH
- testosteron MeSH
- thyreotropin MeSH
- thyroxin 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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