title: Effects of experimental cryptorchidism on sperm motility and testicular endocrinology in adult male rats.
abstract: The effect of induced cryptorchidism on testicular function and sperm motility was investigated. Bilateral cryptorchidism was created surgically in adult male rats (treated group), and sham-operated rats were used as a control group. Five rats from each group were sacrificed on days 1, 3, 5, and 7 after surgery. The percentage of motile spermatozoa began to decrease 1 day after the operation, followed by an abrupt decline 3 and 5 days later in cryptorchid rats. Furthermore, there were significant decreases in the other sperm motility parameters 5 days after inducement of cryptorchidism. In cryptorchid rats, plasma concentrations of LH, FSH, testosterone, and inhibin B were significantly lower than in the control group 1 day after the operation. Thereafter, plasma concentrations of LH, FSH, and testosterone gradually increased in the cryptorchid rats. On the other hand, plasma concentrations of inhibin B showed a further decline from day 3 after the operation onward. Concentrations of immunoreactive (ir)-inhibin, but not testosterone, in testicular interstitial fluid were remarkably increased until 3 days after surgery in the cryptorchid rats, and declined thereafter. Testicular response to human chorionic gonadotropin (hCG) for testosterone release was decreased in the cryptorchid rats compared with the control rats, indicating that heat stress to testes resulted in a reduction of the activity of Leydig cells and Sertoli cells. These results clearly indicate that heat stress to the testes resulted in a significant reduction of sperm activity within 3 days, and this was followed by changes in testicular endocrine function.
authors.affiliation: Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Japan.
authors.forename: Longquan
authors.initials: L
authors.lastname: Ren
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Medan
authors.forename: Mariko
authors.initials: M
authors.lastname: Ozu
authors.forename: Chunmei
authors.initials: C
authors.lastname: Li
authors.forename: Gen
authors.initials: G
authors.lastname: Watanabe
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Taya
mesh_terms: D000818:Animals; D006063:Chorionic Gonadotropin / Q000378:metabolism; D003456:Cryptorchidism / Q000378:metabolism / Q000503:physiopathology*; D004195:Disease Models, Animal; D004703:Endocrine System / Q000473:pathology*; D004797:Enzyme-Linked Immunosorbent Assay; D005640:Follicle Stimulating Hormone / Q000378:metabolism; D007265:Inhibins / Q000097:blood / Q000378:metabolism; D007985:Leydig Cells; D007986:Luteinizing Hormone / Q000378:metabolism; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D012708:Sertoli Cells / Q000378:metabolism; D013081:Sperm Motility; D013737:Testis / Q000378:metabolism / Q000473:pathology*; D013739:Testosterone / Q000097:blood / Q000378:metabolism; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin; C422364:inhibin B; D013739:Testosterone; D007265:Inhibins; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone