Abstract:
:The effects of melatonin administration on thyroid physiology of female hamsters was investigated. A protocol of 25 micrograms given daily as subcutaneous injections late in the light period was found to inhibit blood levels of thyroxin (T4), triiodothyronine (T3) and thyrotropin (TSH). The free T4 index (FT4I) and the free T3 index (FT3I) were also significantly inhibited by melatonin injections. Decreasing the photoperiod under which the hamsters were kept, from 14 h light/10 h dark (14L/10D) to 10L/14D also resulted in decreased blood levels of these hormones. A protocol of melatonin injections using 2.5 mg daily, on the other hand, did not significantly inhibit blood levels of thyroid hormones or TSH; injection of this dose every afternoon into hamsters in long photoperiod significantly augmented the blood levels of T4. Continuously available melatonin in the form of subcutaneous implants of 1 mg melatonin in beeswax did not inhibit blood levels of thyroid hormones; furthermore, such implants prevented the inhibitory effects of injections of 25 micrograms melatonin. The results are consistent with the hypothesis that melatonin interferes with neurotransmitters which influence the synthesis or release of hypothalamic thyrotropin-releasing hormone.
journal_name
Neuroendocrinologyjournal_title
Neuroendocrinologyauthors
Vriend J,Richardson BA,Vaughan MK,Johnson LY,Reiter RJdoi
10.1159/000123359subject
Has Abstractpub_date
1982-01-01 00:00:00pages
79-85issue
2eissn
0028-3835issn
1423-0194journal_volume
35pub_type
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更新日期:1988-07-01 00:00:00
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更新日期:2013-01-01 00:00:00
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更新日期:1980-05-01 00:00:00