Melatonin Receptor Mel1b- and Mel1c- mediated Green Light Induced the Secretion of Growth Hormone in Anterior Pituitary of Chicks.
Authors of this article are:
Yue L, Qin X, Liu X, Wang Z, Dong Y, Chen Y, Cao J.
A summary of the article is shown below:
Previous studies have found that melatonin was related to the growth and development in avian. Therefore, the newly-hatched broilers were exposed to colors of light to establish a model of pinealectomy and explored the mechanism of pineal melatonin promoting growth hormone (GH) secretion. The results showed that green light (GL) promoted the expressions of GH, pituitary-specific transcription factor (Pit-1) genes and proteins in pituitary. Moreover, the mRNA and protein expression of melatonin receptor subtypes Mel1b and Mel1c in the pituitary in GL were higher than other monochromatic light groups. After pinealectomy, the expression of Pit-1, GH, Mel1b, and Mel1c in pituitary decreased. In vitro, exogenous melatonin promoted the expression of Pit-1 mRNA and the secretion of GH in anterior pituitary cells. However, when melatonin was added with exogenous selective Mel1b antagonist (4-phenyl-2-propionamideotetralin) and selective Mel1c antagonist (prazosin), the expression of Pit-1 mRNA and the GH secretion decreased. When selective Mel1b and Mel1c antagonists were added simultaneously, the decrease in Pit-1 mRNA and GH secretion were more significant. These results indicated that pineal melatonin promotes the expression of Pit-1 under GL by binding to melatonin receptor subtypes Mel1b and Mel1c in the pituitary, thereby increasing GH secretion and promoting the growth. This article is protected by copyright. All rights reserved.This article is protected by copyright. All rights reserved.
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This article is a good source of information and a good way to become familiar with topics such as: Melatonin; Pit-1; chick; growth hormone; monochromatic light.