Effect of human chorionic gonadotropin on luteinizing hormone and prolactin binding by testes of bilaterally cryptorchid rats.

This study investigates the ability of the testis in the cryptorchid state to bind luteinizing hormone (LH) and prolactin (Prl). For this purpose, rats were made bilaterally cryptorchid at 21 days of age; sham-operated rats were used as controls. At 56 days, the animals were injected with saline or with increasing doses of human chorionic gonadotropin (hCG: 1, 10 or 100 IU) and killed 8 or 24 h after injection.