Molecular events mediating sperm activation
Article Abstract:
Egg jelly retards the respiration of L. Pictus and A. punctulata sperm, and the reaction of these sperm with speract and resact counter this inhibition, indicating that these peptides might control respiration and/or motility together with element in the egg jelly that enhances fertilization. Sperm in sea urchin react to peptides isolated from egg-conditioned media of the homologous species, hinting that the sperm reaction may be mediated through particular peptide receptors on the sperm surface. The induction of the acrosome reaction is a response to extracellular signals from the egg, its related cellular and acellular structures and the female reproductive tract.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
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Lipophilic organizing structures of sperm nuclei target membrane vesicle binding and are incorporated into the nuclear envelope
Article Abstract:
A study was conducted to examine the origin of the nuclear envelope in a cell-free system from fertilized eggs of the sea urchin. Staining methods revealed the existence of lipophilic structures (LS) in the demembrenated sperm nuclei that were resistant to solubilization in non-ionic detergent Triton X-100. These structures initiated ATP-dependent membrane vesicle binding in a fertilized egg extract but lose this ability when LS is removed from the sperm nuclei. LS is recovered by binding to the acrosomal pole, which consequently allows nuclear envelope formation.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1995
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Successive electrical responses to insemination and concurrent sperm entries in the polyspermic egg of the ctenophore Beroe ovata
Article Abstract:
An experiment was conducted to study the electrophysiological events that occur during fertilization of the polyspermic egg of Beroe ovata. Results show that eggs evoke a number of sperm-induced egg electrical potentials depending on the number of male pronuclei in its cortex, indicating the autonomy of each sperm entry. However, comparison of in vitro and in vivo inseminations showed the presence of both polyspermic and monospermic eggs.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
User Contributions:
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