Martino E, Seo H, Lernmark A, Refetoff S
Proc Natl Acad Sci U S A. 1980 Jul;77(7):4345-8. doi: 10.1073/pnas.77.7.4345.
Recent observations have shown the presence of thyrotropin-releasing hormone-like material (TRH-LM) in rat pancreatic islets and in retina. Its immunological and biological properties are identical to those of synthetic thyrotropin-releasing hormone (thyroliberin). This communication deals with the ontogenesis of TRH-LM in rat pancreas and retina as compared to that of rat hypothalamus. Effects of sex and exposure to constant dark were also studied. Results show that asynchronous changes in the concentration of TRH-LM occur during the postnatal maturation of these tissues, presumably mediated by organ-specific control mechanisms--e.g., light affects only the accumulation of TRH-LM in the retina. TRH-LM may act as neurotransmitter in the regulation of pancreatic islet cell function and in the development of photo-reception in the retina. Increases in hypothalamic TRH-LM seem to parallel the development of the pituitary-thyroid secretory activity, but the function of extrahypothalamic TRH-LM remains speculative.
最近的观察结果显示,大鼠胰岛和视网膜中存在促甲状腺激素释放激素样物质(TRH-LM)。其免疫学和生物学特性与合成促甲状腺激素释放激素(促甲状腺素释放素)相同。本文探讨了大鼠胰腺和视网膜中TRH-LM的个体发生过程,并与大鼠下丘脑的情况进行了比较。同时还研究了性别和持续黑暗暴露的影响。结果表明,这些组织在出生后成熟过程中,TRH-LM浓度会发生异步变化,推测这是由器官特异性控制机制介导的——例如,光照仅影响视网膜中TRH-LM的积累。TRH-LM可能作为神经递质参与调节胰岛细胞功能以及视网膜光感受器的发育。下丘脑TRH-LM的增加似乎与垂体-甲状腺分泌活动的发育平行,但下丘脑外TRH-LM的功能仍有待推测。