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Definitive expression of c-mos in late meiotic prophase leads to phosphorylation of a 34 kda protein in cultured rat spermatocytes.

Authors: Nagao, Y 
Citation: Nagao Y Cell Biol Int 2002;26(2):193-201.
Pubmed: (View Article at PubMed) PMID:11846449
DOI: Full-text: DOI:10.1006/cbir.2001.0834

To investigate the role of c-mos in rat spermatogenesis, expression of c-mos, MAP kinase kinase (MAPKK), MAP kinase (MAPK), cdc2 and protein kinase A (PKA) by spermatogenic cell culture of 14 day-old rats was examined. MAPKK and PKA expressions were constitutive, whereas the expression of MAPK and cdc2 in spermatogonia initially decreased, but later increased on meiotic maturation of spermatocytes. c-mos expression was definitive of late meiotic prophase. c-mos immunoprecipitates prepared from the c-mos-enriched fraction (pI9.0-9.6) could form complex(es) in the cultured spermatogenic cell lysates. In vitro phosphorylation of the c-mos immune complexes revealed a 34 kDa protein that was phosphorylated at serine and threonine residues as a target of the c-mos signal. Its pI value was 4.4-4.5, and cdc2 was not detected, making it different from cdc2 (p34). These results suggest that the phosphorylation of the 34 kDa protein by the c-mos signal may play a crucial role in the meiotic division of rat spermatocytes.


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CRRD Object Information
CRRD ID: 1298984
Created: 2004-06-01
Species: All species
Last Modified: 2006-04-25
Status: ACTIVE


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