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Gonadotropic response to testicular transplants in the rat.

Adult inbred male rats were bilaterally castrated and received one testicle as a transplant to the scrotum. The blood supply of the grafts was reestablished by performing an end—to—side anastomosis between an aorto—caval segment of the donor bearing the testicular vessels and the abdominal aorta plus vena cava of the recipient. The average ischemia was 40 min. After 9, 14 and 20 weeks the grafts were removed. Lutenizing hormone (LH) and follicle—stimulating hormone (FSH) were determined by radioimmunoassay in serum samples obtained at weekly intervals from intact controls, hypophysectomized, castrated, and transplanted rats. The transplant recipients maintained LH and FSH values within the range of intact controls (LH = 60–120 μg/ml; FSH = 350–550 μg/ml). Hypophysectomized rats displayed undetectable LH and FSH levels. Removal of the grafts was followed in each instance by a rise of LH and FSH in a castrate pattern. Histology revealed good preservation of the testicular structure after transplantation. (E...