The organization of the cortical layer of amphibian ova. 1. The ultrastructure of the cortex of the oocytes and ova of the clawed toad: the effect of divalent cations

Ultrastructure of oocyte and egg cortical layer isolated in media containing various ions has been studied. The following results were obtained: 1) in cortical layer a two-component cytoskeletal system is present; morphology of this system changes during development; 2) cytoskeleton of the egg corte...

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Bibliographic Details
Published inOntogenez Vol. 21; no. 3; p. 286
Main Author Riabova, L V
Format Journal Article
LanguageRussian
Published Russia (Federation) 01.05.1990
Subjects
Animals
Calcium - pharmacology
Cations, Divalent
Cells, Cultured - drug effects
Cells, Cultured - ultrastructure
Culture Media
Cytoskeleton - drug effects
Cytoskeleton - ultrastructure
Female
Magnesium - pharmacology
Oocytes - drug effects
Oocytes - ultrastructure
Ovum - drug effects
Ovum - ultrastructure
Xenopus laevis
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Summary:Ultrastructure of oocyte and egg cortical layer isolated in media containing various ions has been studied. The following results were obtained: 1) in cortical layer a two-component cytoskeletal system is present; morphology of this system changes during development; 2) cytoskeleton of the egg cortex acts as a two-component system in response to the influence of Ca2+: the cortex per se is destroyed while subcortex is contracted; 3) cytoskeleton of the oocyte cortex is destroyed under the influence of Ca2+; 4) nature and sensitivity to the absence of Mg2+ in the medium varies for cytoskeletal structures of oocyte and egg cortex.
ISSN:0475-1450