Abstract:
:The sequence of ionic changes involved in initiation of acrosomal exocytosis in capacitated mouse spermatozoa was investigated. Earlier studies demonstrated that a large influx of Na+ is required for exocytosis, this Na+ apparently being associated with an increase in intracellular pH (pHi) via an Na(+)-H+ exchanger. This rise in pHi may in turn activate calcium channels and permit the influx of extracellular Ca2+ needed to trigger acrosomal exocytosis. In the present study, the dihydropyridine voltage-dependent calcium channel antagonist nifedipine was able to inhibit significantly exocytosis in sperm cells treated in various ways capable of stimulating acrosomal loss. The monovalent cation ionophore monensin can promote Na+ entry required for both capacitation and acrosomal exocytosis, as demonstrated by using chlortetracycline to monitor changes in sperm functional potential. In the presence of 10 nM nifedipine, monensin treatment accelerated capacitation but was unable to trigger exocytosis. The requirement for internalization of a high concentration of Na+ can be bypassed by the addition of 25 mM NH4Cl to raise the pHi of cells capacitated in 25 mM Na+ (insufficient Na+ to support exocytosis under usual conditions). Again, introduction of nifedipine was able to inhibit exocytosis. In a third experimental approach, amiloride-stimulated exocytosis in capacitated cells was significantly inhibited by nifedipine. In contrast to these treatments directed at specific mechanisms, the ability of the Ca2+ ionophore A23187 to promote more general entry of Ca2+ and thereby to accelerate capacitation and exocytosis was not inhibited by nifedipine.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Mol Reprod Devjournal_title
Molecular reproduction and developmentauthors
Fraser LRdoi
10.1002/mrd.1080360313subject
Has Abstractpub_date
1993-11-01 00:00:00pages
368-76issue
3eissn
1040-452Xissn
1098-2795journal_volume
36pub_type
杂志文章abstract::Amino acid analyses of nuclear basic proteins of an anuran amphibian, Rana catesbeiana, revealed that they are comprised of a full set of core histones and three types of lysine-rich, sperm-specific proteins. On the basis of their amino-acid compositions and partial amino-acid sequences of their trypsin-resistant core...
journal_title:Molecular reproduction and development
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