期刊
REPRODUCTION FERTILITY AND DEVELOPMENT
卷 20, 期 2, 页码 247-252出版社
CSIRO PUBLISHING
DOI: 10.1071/RD07146
关键词
sperm motility
资金
- EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH &HUMAN DEVELOPMENT [F31HD043693] Funding Source: NIH RePORTER
- NICHD NIH HHS [F31 HD043693-02, F31 HD043693-01, F31 HD043693, F31 HD43693] Funding Source: Medline
Soluble adenylyl cyclase (SACY) is an essential component of cAMP-signalling cascades that activate sperm motility and capacitate sperm. SACY activity is stimulated by HCO(3)(-)and Ca2+. Sperm from Sacy(-/-)(null) mice were immotile or weakly motile, but cAMP analogues N-6,2'-O-dibutyryladenosine 3',5'-cyclic monophosphate (dbcAMP) and adenosine 3',5'-cyclic monophosphate acetoxymethyl ester (cAMP-AM) activated motility. Null sperm activated by dbcAMP quickly developed hairpin bends at the junction of the midpiece and principal piece, which could be prevented by omitting HCO3-. Treating Sacy(-/-)sperm with thimerosal or NH4Cl to raise flagellar cytoplasmic Ca2+ could not substitute for cAMP analogues in activating motility; however, sperm activated with cAMP-AM hyperactivated after thimerosal treatment. Treating activated wild-type sperm with SACY inhibitor KH7 did not prevent hyperactivation from developing during capacitation in vitro, although high doses impaired motility. These results indicate that, while the SACY/cAMP signalling pathway is required for motility activation, it is not directly involved in triggering hyperactivation.
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