Thyroidectomy Does Not Affect the Daily or Free-Running Rhythms of Plasma Melatonin in European Starlings
| العنوان: | Thyroidectomy Does Not Affect the Daily or Free-Running Rhythms of Plasma Melatonin in European Starlings |
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| المؤلفون: | A. Dawson, Verdun M. King |
| المصدر: | Journal of Biological Rhythms. 9:137-144 |
| بيانات النشر: | SAGE Publications, 1994. |
| سنة النشر: | 1994 |
| مصطلحات موضوعية: | Male, 0301 basic medicine, medicine.medical_specialty, Physiology, Photoperiod, Period (gene), media_common.quotation_subject, medicine.medical_treatment, Thyroid Gland, Biology, Birds, Melatonin, 03 medical and health sciences, 0302 clinical medicine, Physiology (medical), Internal medicine, medicine, Animals, Circadian rhythm, media_common, photoperiodism, Starling, Thyroidectomy, biology.organism_classification, Circadian Rhythm, Europe, 030104 developmental biology, Endocrinology, Darkness, Reproduction, 030217 neurology & neurosurgery, medicine.drug |
| الوصف: | Thyroidectomy results in the suppression of reproductive photoperiodic responses in starlings. Could this be a consequence of an effect on perception of daylength or on circadian pacemakers? Daily changes in plasma melatonin concentrations were monitored in intact and thyroidectomized starlings held in long days (LD 16:8) and short days (LD 8:16), and in intact and thyroidectomized starlings allowed to free-run in constant darkness from long days or short days. In long days and short days, melatonin was low during the light period and high during darkness. There was no difference between intact and thyroidectomized birds. In free-running birds, the melatonin profile of the preceding long day or short day was retained during the first day of constant darkness, with peak levels occurring at the same time they did during the light-dark cycles. Again there was no difference between intact and thyroidectomized birds. These data demonstrate that either the photoreceptive and circadian mechanisms driving melatonin secretion are independent of those concerned with reproductive photoperiodic responses, or that thyroidec tomy affects reproduction "downstream" from the photoreceptive-circadian apparatus. |
| تدمد: | 1552-4531 0748-7304 |
| DOI: | 10.1177/074873049400900204 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8547fd9f424ffc34651747f13fe96bdc https://doi.org/10.1177/074873049400900204 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....8547fd9f424ffc34651747f13fe96bdc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15524531 07487304 |
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| DOI: | 10.1177/074873049400900204 |