Smale L, Dark J, Zucker I
Department of Psychology, University of California, Berkeley 94720.
J Biol Rhythms. 1988 Winter;3(4):349-55. doi: 10.1177/074873048800300404.
Pinealectomy completely prevented gonadal regression as well as reduction in body weight and white adipose tissue content of the gonadal and retroperitoneal fat deposits in male meadow voles transferred from long to short day lengths. Pineal influences on pelage characteristics depended on which parameter was assessed. For instance, the increase in guard hair length observed in short-day control voles was blocked by pinealectomy; however, a similar increase in underhair length was unaffected by removal of the pineal gland. Photoperiod-dependent changes in fat deposition, testicular activity, and guard hair length presumably rely on altered pineal secretory activity to transduce the effects of day length on the neuroendocrine axis; however, mechanisms independent of pineal activity may be capable of mediating photoperiodic control of underhair growth.
松果体切除完全阻止了从长日照转移到短日照的雄性草甸田鼠性腺退化以及体重减轻和性腺及腹膜后脂肪沉积物中白色脂肪组织含量的减少。松果体对被毛特征的影响取决于所评估的参数。例如，在短日照对照田鼠中观察到的针毛长度增加被松果体切除所阻断；然而，绒毛长度的类似增加不受松果体摘除的影响。脂肪沉积、睾丸活动和针毛长度的光周期依赖性变化可能依赖于松果体分泌活动的改变来传导日照长度对神经内分泌轴的影响；然而，独立于松果体活动的机制可能能够介导对绒毛生长的光周期控制。
