Cortical reaction and zona hardening in mouse oocytes following exposure to ethanol
Mouse oocytes were treated with 8% ethanol for 3-6 min. The rate and pathways of parthenogenetic activation, occurrence of cortical reaction, and zona solubility changes were assessed in alcohol-treated eggs. The incidence of parthenogenetic activation was greatest (91%) after 3-4-min exposure, and...
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Published in | The Journal of experimental zoology Vol. 233; no. 2; p. 269 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
01.02.1985
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Abstract | Mouse oocytes were treated with 8% ethanol for 3-6 min. The rate and pathways of parthenogenetic activation, occurrence of cortical reaction, and zona solubility changes were assessed in alcohol-treated eggs. The incidence of parthenogenetic activation was greatest (91%) after 3-4-min exposure, and it was reduced (84%) after 5-6-min exposure to alcohol. Also, the rate of haploid single pronucleate parthenogenones decreased and the rate of fragmented ova increased with increase time of exposure to ethanol. Ultrastructural observations showed occurrence of cortical reaction, disappearance and subsequent reappearance of short microvilli. A slight damage occurred to the ER in alcohol-exposed ova. The zona dissolution assay utilizing alpha-chymotrypsin demonstrated decreased solubility of the zonae pellucidae after exposure to alcohol. The zona dissolution t50 increased from 0.5-2.5 min in nontreated unfertilized oocytes to about 4 h in activated ova. The t50 of in vivo fertilized eggs was 4 1/2 h. Empty zonae exposed to alcohol lysed at the same rate as nontreated control zonae did. The results indicate that activation of mouse oocytes with alcohol initiates completion of meiosis and triggers the cortical reaction, which results in subsequent hardening of the zona pellucida. |
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AbstractList | Mouse oocytes were treated with 8% ethanol for 3-6 min. The rate and pathways of parthenogenetic activation, occurrence of cortical reaction, and zona solubility changes were assessed in alcohol-treated eggs. The incidence of parthenogenetic activation was greatest (91%) after 3-4-min exposure, and it was reduced (84%) after 5-6-min exposure to alcohol. Also, the rate of haploid single pronucleate parthenogenones decreased and the rate of fragmented ova increased with increase time of exposure to ethanol. Ultrastructural observations showed occurrence of cortical reaction, disappearance and subsequent reappearance of short microvilli. A slight damage occurred to the ER in alcohol-exposed ova. The zona dissolution assay utilizing alpha-chymotrypsin demonstrated decreased solubility of the zonae pellucidae after exposure to alcohol. The zona dissolution t50 increased from 0.5-2.5 min in nontreated unfertilized oocytes to about 4 h in activated ova. The t50 of in vivo fertilized eggs was 4 1/2 h. Empty zonae exposed to alcohol lysed at the same rate as nontreated control zonae did. The results indicate that activation of mouse oocytes with alcohol initiates completion of meiosis and triggers the cortical reaction, which results in subsequent hardening of the zona pellucida. |
Author | Yuan, L C Gulyas, B J |
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SubjectTerms | Animals Ethanol - pharmacology Female Meiosis Mice Mice, Inbred Strains Oocytes - drug effects Oocytes - ultrastructure Ovum - drug effects Parthenogenesis - drug effects Time Factors Zona Pellucida - drug effects |
Title | Cortical reaction and zona hardening in mouse oocytes following exposure to ethanol |
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