HOURLY FLUCTUATIONS IN THE BLOOD-LEVELS OF MELATONIN, PROLACTIN, LUTEINIZING-HORMONE, FOLLICLE-STIMULATING-HORMONE, TESTOSTERONE, TRI-IODOTHYRONINE, THYROXINE AND CORTISOL IN RAMS UNDER ARTIFICIAL PHOTOPERIODS, AND THE EFFECTS OF CRANIAL SYMPATHECTOMY
HOURLY FLUCTUATIONS IN THE BLOOD-LEVELS OF MELATONIN, PROLACTIN, LUTEINIZING-HORMONE, FOLLICLE-STIMULATING-HORMONE, TESTOSTERONE, TRI-IODOTHYRONINE, THYROXINE AND CORTISOL IN RAMS UNDER ARTIFICIAL PHOTOPERIODS, AND THE EFFECTS OF CRANIAL SYMPATHECTOMY
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DOI：
10.1677/joe.0.0920237
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发表时间：
1982-01-01
影响因子：
4
通讯作者：
CUNNINGHAM, RA
中科院分区：
文献类型：
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作者：
LINCOLN, GA;ALMEIDA, OFX;CUNNINGHAM, RA
八只成人soay公羊（通过去除上宫颈神经节的去除，有4个对照和4个颅骨交感）暴露于8小时光的短天的交替时间：16 h黑暗（8l：16d）和漫长的日子（16l：8d）对于3年以上，并且记录了睾丸直径的变化。每小时一次，在漫长的几天内，每小时收集血液样本28小时，褪黑激素，催乳素，FSH，LH [黄体生成激素]，睾丸激素，睾丸激素，三碘甲醇（T3），甲状腺素（t4）和皮质醇通过皮质醇测量放射免疫分子。在对照杆中，与短几天相比，在漫长的几天内，睾丸的大小降低，而FSH，LH和睾丸激素的血液浓度（24小时平均值）降低。催乳素的水平大大增加，而褪黑激素，T3，T4和皮质醇的平均水平没有显着变化。在两个光周期期间，所有8种激素的每小时都有很大的每小时变化，表明了情节分泌，并且与一天中的时间有关，这对于褪黑激素和T3最为明显。短天和漫长的日子之间，血浆褪黑激素水平的每日特征存在明显差异。在上宫颈神经节切除式公羊中，睾丸的大小或短天之间的激素滴度没有显着变化。与对照相比，LH，FSH，睾丸激素和催乳素的血浆水平在中间范围内。在所有测量的激素的水平上，有一些一致的昼夜变化，其模式与一些激素的对照相似（例如T3），但对其他激素的模式（例如，褪黑激素）却大不相同。
Eight adult Soay rams (4 control and 4 cranially sympathectomized by removal of the superior cervical ganglia) were exposed to alternating 16 wk periods of short days of 8 h light:16 h darkness (8L:16D) and long days (16L:8D) for more than 3 yr, and the changes in the diameter of the testes were recorded. Once during short days and once during long days blood samples were collected hourly for 28 h, and the concentrations of melatonin, prolactin, FSH, LH [luteinizing hormone], testosterone, triiodothyronine (T3), thyroxine (T4) and cortisol were measured by radioimmunoassay. In the control rams the testes were reduced in size during long days compared to during short days, and the blood concentrations (24-h mean values) of FSH, LH and testosterone were decreased. The levels of prolactin were much increased, while there was no significant change in the mean levels of melatonin, T3, T4 and cortisol. During both photoperiods there was considerable hour-to-hour variation in all 8 hormones indicative of episodic secretion, as well as a consistent variation related to the time of day which was most pronounced for melatonin and T3. There was a clear difference in the daily profile of plasma melatonin levels between short and long days. In the superior cervical ganglionectomized rams there were no significant changes in the size of the testes or in the hormone titers between short and long days. Compared to the controls the plasma levels of LH, FSH, testosterone and prolactin were in the intermediate range. Some consistent diurnal variation was evident in the levels of all the hormones measured, with a pattern similar to the controls for a few of the hormones (e.g., T3) but quite different for others (e.g., melatonin).