Perisuprachiasmatic lesions enhance the increase of gonadotropin secretion in acutely ovariectomized rats.
Diestrous female rats were bilaterally lesioned in the perisuprachiasmatic region (peri-SCN region) or in the medial preoptic area (MPOA) and ovariectomized immediately after lesioning. Blood was collected at one hour before and at 4.24 and 48 h after surgery. Radioimmunological determination of the serum gonadotropin concentrations revealed that lesioning of the peri-SCN region enhanced significantly the castration-induced increase of FSH and LH secretion at 4 and 24 h, whereas MPOA lesions did not influence the serum hormone levels as compared to the sham-lesioned controls. The findings suggest that the peri-SCN region, but not the MPOA may be involved in the control of the increase of gonadotropin secretion following ovariectomy in rats.
D000818:Animals; D002369:Castration; D004031:Diestrus; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006062:Gonadotropins / Q000097:blood / Q000378:metabolism*; D007032:Hypothalamus, Anterior / Q000502:physiology*; D007986:Luteinizing Hormone / Q000097:blood; D010053:Ovary / Q000502:physiology*; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains
D006062:Gonadotropins; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone