Document Detail

Effects of thioglycolic acid on progesterone-induced maturation of Xenopus oocytes.
MedLine Citation:
PMID:  20077179     Owner:  NLM     Status:  MEDLINE    
In order to examine the effects of thioglycolic acid (TGA) on reproduction, Xenopus oocytes were treated with different concentrations of TGA. During culture, frequencies of germinal vesicle breakdown (GVBD) and MI-MII transition were determined. Samples collected at indicated times were subjected to immunoblotting. Data indicated that TGA accelerated the frequency of GVBD, but inhibited polar body extrusion and formation of MII-arrested eggs in a concentration-dependent manner. At 4 h after progesterone addition, phosphorylation of extracellular signal-regulated kinase (ERK) and p90 ribosomal S6 kinase, two members of the mitogen-activated protein kinase (MAPK) pathway, was upregulated in TGA-treated oocytes. The regulatory subunit of M-phase promoting factor (MPF)-cyclin B was also upregulated by TGA, while phospho-Cdc2 was downregulated. At 8 h, Cdc2 dephosphorylation and cyclin B1 were downregulated by TGA treatment. However, TGA exerted no effect on Mos, an MAPKKK (MAPK kinase kinase). In conclusion, TGA has the potential to inhibit in vitro maturation of Xenopus oocyte with increased GVBD frequency accompanied by alterations in protein expression and phosphorylation involved in MPF and MAPK pathways. Since egg formation is essential to maintain appropriate reproductive capacity, our findings may have certain toxicological implications.
Ling Zhang; Shao-Ying Hou; Dong Wang; Kun Wu; Lei Xia
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of toxicology and environmental health. Part A     Volume:  72     ISSN:  1528-7394     ISO Abbreviation:  J. Toxicol. Environ. Health Part A     Publication Date:  2009  
Date Detail:
Created Date:  2010-01-15     Completed Date:  2010-02-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100960995     Medline TA:  J Toxicol Environ Health A     Country:  England    
Other Details:
Languages:  eng     Pagination:  1123-31     Citation Subset:  IM    
Department of Nutrition and Food Hygiene, Harbin Medical University, Heilongjiang, China.
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MeSH Terms
CDC2 Protein Kinase / metabolism
Cyclin B1 / metabolism
Hair Preparations / pharmacology*
Mitogen-Activated Protein Kinases / metabolism
Oocytes / drug effects*
Progesterone / pharmacology*
Signal Transduction
Thioglycolates / pharmacology*
Xenopus laevis
Reg. No./Substance:
0/Cyclin B1; 0/Hair Preparations; 0/Thioglycolates; 57-83-0/Progesterone; EC Protein Kinase; EC Protein Kinases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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