Brainard G C, Vaughan M K, Reiter R J
Endocrinology. 1986 Aug;119(2):648-54. doi: 10.1210/endo-119-2-648.
The purpose of this study was to examine how the physical characteristics of light influence the short photoperiod-induced atrophy of the reproductive system. In the first experiment, groups of Syrian hamsters were exposed to a 14-h light, 10-h dark (14:10) photoperiod, a 11:13 photoperiod or a 11:13 photoperiod extended by 3 h of light at an irradiance of 20, 2, 0.2, or 0.002 microW/cm2. Animals in the 11:13 photoperiod and the 11:13 photoperiod extended by 0.02 and 0.002 microW/cm2 underwent reproductive regression, as evidenced by decreased testicular and accessory sex organ weight and pituitary PRL levels. In the second study, groups of hamsters were exposed to a 14:10, 11:13, or 11:13 photoperiod extended by 3 h of red, yellow, green, blue, or near-UV light at 0.2 microW/cm2. Animals in the 11:13 and the 11:13 photoperiod extended by red or yellow light underwent reproductive atrophy. These results demonstrate that light irradiance and wavelength are important determinants of the photoperiodic regulation of the Syrian hamster reproductive system.
本研究的目的是探究光的物理特性如何影响短光周期诱导的生殖系统萎缩。在第一个实验中，将叙利亚仓鼠分组，分别暴露于14小时光照、10小时黑暗（14:10）的光周期、11:13的光周期或在20、2、0.2或0.002微瓦/平方厘米的辐照度下延长3小时光照的11:13光周期。处于11:13光周期以及在0.02和0.002微瓦/平方厘米辐照度下延长的11:13光周期的动物出现了生殖功能衰退，这表现为睾丸和附属生殖器官重量减轻以及垂体催乳素水平降低。在第二项研究中，将仓鼠分组，分别暴露于14:10、11:13或在0.2微瓦/平方厘米下延长3小时红色、黄色、绿色、蓝色或近紫外光的11:13光周期。处于11:13以及在红色或黄色光下延长的11:13光周期的动物出现了生殖器官萎缩。这些结果表明，光辐照度和波长是叙利亚仓鼠生殖系统光周期调节的重要决定因素。
