Acrosome reaction inactivation in sea urchin sperm
نویسندگان
چکیده
منابع مشابه
Egg sialoglycans increase intracellular pH and potentiate the acrosome reaction of sea urchin sperm.
Sea urchin egg jelly (EJ) triggers sperm acrosome reaction (AR), an exocytotic event required for membrane fusion of the gametes. Purified fucose sulfate polymer (FSP) in EJ is one inducer of the AR. Binding of FSP to its receptor regulates opening of two distinct calcium channels and also elevates intracellular pH (pH(i)). EJ also contains sialic acid-rich glycans (sialoglycans (SG)) that were...
متن کاملCharacterization of a monoclonal antibody that induces the acrosome reaction of sea urchin sperm
A monoclonal antibody, J18/29, induces the acrosome reaction (AR) in spermatozoa of the sea urchin Strongylocentrotus purpuratus. J18/29 induces increases in both intracellular Ca2+ and intracellular pH similar to those occurring upon induction of the AR by the natural inducer, the fucose sulfate-rich glycoconjugate of egg jelly. Lowering the Ca2+ concentration or the pH of the seawater inhibit...
متن کاملInvolvement of zinc in the regulation of pHi, motility, and acrosome reactions in sea urchin sperm
When sperm of Strongylocentrotus purpuratus or Lytechinus pictus are diluted into seawater, motility is initiated; and when exposed to egg jelly, an acrosome reaction is induced. In the presence of a variety of structurally different metal chelators (0.1-1 mM EDTA, EGTA, phenanthroline, dipyridyl, cysteine, or dithiothreitol), motility initiation is delayed and the acrosome reaction is inhibite...
متن کاملThe exocytosis regulatory proteins syntaxin and VAMP are shed from sea urchin sperm during the acrosome reaction.
Syntaxin is a cytoplasmically oriented plasma membrane protein and VAMP (vesicle-associated membrane protein; synaptobrevin) is a protein associated with the secretory vesicle membrane. These two proteins form part of a complex which is thought to mediate the fusion of plasma and vesicle membranes during exocytosis. This paper reports the identification of syntaxin and VAMP homologues in sea ur...
متن کاملEvidence for the activation of two different Ca2+ channels during the egg jelly-induced acrosome reaction of sea urchin sperm.
The influx of Ca2+ and its subsequent intracellular increase are required for the acrosome reaction of sea urchin sperm to occur. Spermatozoa must undergo this reaction, which is triggered by the egg jelly, in order to fertilize the egg. Here, the egg jelly-induced Ca2+ influx mechanisms have been studied in sperm loaded with FURA-2 using Mn2+ under the assumption that this divalent ion is an i...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
سال: 1998
ISSN: 0167-4889
DOI: 10.1016/s0167-4889(97)00127-4