title: Hyperactivated motility of frozen-thawed spermatozoa from fertile and subfertile Japanese black bulls induced by cyclic adenosine 3',5'-monophosphate analogue, cBiMPS.
abstract: This study investigated whether a cyclic adenosine 3',5'-monophosphate (cAMP) analogue, cBiMPS, could induce hyperactivated motility in frozen-thawed Japanese Black bull spermatozoa and compared the ability of spermatozoa to undergo hyperactivation between fertile and subfertile bulls. Frozen-thawed spermatozoa from 3 fertile and 2 subfertile bulls were washed, suspended in BO-Hepes medium and incubated in the presence of 0.1 mM cBiMPS for up to 4 h. At 1-h intervals, the spermatozoa were examined for hyperactivated motility. The proportions of spermatozoa showing a circular swimming pattern with asymmetrical flagellar beating and those showing whiplash beating of flagella to the total number of motile spermatozoa were expressed as C% and W%, respectively. The motile spermatozoa % was barely affected by treatment with cBiMPS or the fertility status of the sperm donor, although it gradually decreased in all sperm samples during the 4-h incubation. In the fertile bulls, the C% was 0% at 0 h of incubation but rapidly increased during the 1-h incubation with cBiMPS. It then decreased slightly towards 4 h concomitantly with a gradual increase in W% towards 4 h. In the subfertile bulls, however, the cBiMPS-induced increase of C% was delayed for 1-3 h, although the incubation time-related changes in mean W% were similar between the fertile and subfertile bulls. In the vehicle controls for cBiMPS, the C% and W% were 0% throughout incubation for all the samples examined. The results suggest that hyperactivation of the flagellum can be induced by the cAMP analogue, cBiMPS, in frozen-thawed Japanese Black bull spermatozoa and that induction of hyperactivation may serve as a useful tool for detection of functional abnormality of spermatozoa from subfertile Japanese Black bulls.
authors.affiliation: Laboratory of Theriogenology, Division of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Japan. muraset@gifu-u.ac.jp
authors.forename: Tetsuma
authors.initials: T
authors.lastname: Murase
authors.forename: Ismail
authors.initials: I
authors.lastname: El-Kon
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Harayama
authors.forename: Koushi
authors.initials: K
authors.lastname: Mukoujima
authors.forename: Masaki
authors.initials: M
authors.lastname: Takasu
authors.forename: Kenji
authors.initials: K
authors.lastname: Sakai
mesh_terms: D000818:Animals; D002417:Cattle; D015925:Cryopreservation; D004004:Dichlororibofuranosylbenzimidazole / Q000031:analogs & derivatives* / Q000494:pharmacology; D007248:Infertility, Male / Q000175:diagnosis; D007564:Japan; D008297:Male; D012662:Semen Preservation; D013075:Sperm Capacitation / Q000187:drug effects; D013081:Sperm Motility / Q000187:drug effects*; D013094:Spermatozoa / Q000187:drug effects; D013873:Thionucleotides / Q000494:pharmacology*
chemical_list: D013873:Thionucleotides; C071644:5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole-3',5'-monophosphorothioate; D004004:Dichlororibofuranosylbenzimidazole