Induction of the Acrosome Reaction of Sea Urchin Spermatozoa by Means of Urea. (acrosome reaction/spermatozoa/urea/sea urchin)
نویسندگان
چکیده
منابع مشابه
Characterization 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 کاملEgg 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 کاملThe effect of platelet activating factor on the motility and acrosome reaction of ram spermatozoa
Platelet activating factor (PAF) is a novel signaling phospholipids that in addition to platelet activation has many biological properties. The acrosome reaction, as an essential step in mammalian fertilization, can occur in response to several agents such as PAF. Therefore, the present study aimed to assess the effect of PAF on the motility and acrosome reaction of ram spermatozoa. Semen was c...
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 Physiology of Sea-urchin Spermatozoa
Since Gray showed in 1928 that dilute suspensions of sea-urchin spermatozoa respire at a higher rate, per spermatozoon, than dense suspensions, evidence has been accumulating which suggests that sea-urchin spermatozoa are in different physiological conditions in suspensions of different densities. This paper is concerned with these differences and, in particular, with the effects of rigorous pH...
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ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 1983
ISSN: 0012-1592,1440-169X
DOI: 10.1111/j.1440-169x.1983.00153.x