Rozendaal J C, Crews D
Department of Zoology, University of Texas, Austin 78712.
Horm Behav. 1989 Jun;23(2):194-202. doi: 10.1016/0018-506x(89)90060-3.
Dihydrotestosterone was implanted directly into the brain of castrated male Cnemidophorus inornatus, a direct sexual ancestor of the parthenogenetic species C. uniparens. Only implants located in the anterior hypothalamus--preoptic area (AH-POA) induced male-typical sexual behavior. Implants in other brain regions, including the ventromedial hypothalamus, failed to elicit courtship or copulatory behavior. Radioimmunoassay revealed no significant difference in the concentrations of circulating androgens between the responding and nonresponding animals. Previous data from this laboratory demonstrated that the AH-POA controls male-like pseudosexual behavior in C. uniparens. The current results support the hypotheses that (i) the AH-POA is the major area of hormone action in the brain controlling male-typical sexual behavior in C. inornatus as in other vertebrates and (ii) the neural circuits controlling male-typical behavior have been conserved in the evolution of the parthenogen C. uniparens.
双氢睾酮被直接植入阉割后的雄性无饰鞭尾蜥的大脑中，无饰鞭尾蜥是孤雌生殖物种单性鞭尾蜥的直系有性生殖祖先。只有位于下丘脑前部——视前区（AH-POA）的植入物能诱发雄性典型性行为。植入其他脑区（包括腹内侧下丘脑）的植入物未能引发求偶或交配行为。放射免疫分析显示，有反应和无反应的动物之间循环雄激素浓度没有显著差异。该实验室之前的数据表明，AH-POA控制着单性鞭尾蜥的雄性样假性行为。目前的结果支持以下假设：（i）AH-POA是大脑中激素作用的主要区域，如同在其他脊椎动物中一样，控制着无饰鞭尾蜥的雄性典型性行为；（ii）控制雄性典型行为的神经回路在孤雌生殖的单性鞭尾蜥的进化过程中得以保留。
