Abstract:
:Mos is a germ cell-specific serine/threonine protein kinase that plays an important role during meiotic divisions of oocytes. Upon expression in somatic cells, Mos causes cell cycle perturbations leading to neoplastic transformation. Mos activates the MAP kinase pathway in both oocytes and transformed somatic cells. To determine the mechanism of cell cycle perturbation in mos-transformed cells, we examined the status of some key regulators of G1 phase. We provide evidence that Mos causes an elevation in the level of cyclin D1 in NIH/3T3 cells. As expected from the increased cyclin D1 level, mos transformation of NIH/3T3 cells caused an increase in the protein kinase activities of cyclin D1-Cdk4 and cyclin E-Cdk2 and induced hyperphosphorylation of the retinoblastoma protein. Of importance, the level of cyclin D1 was also elevated in eye lens of the c-mos-transgenic mice compared to normal mice. Our results indicate that the mechanism of cellular transformation by Mos involves an elevation in the level of cyclin D1 in somatic cells.
journal_name
Int J Oncoljournal_title
International journal of oncologyauthors
Yang Y,Pham CD,Arlinghaus RB,Khillan JS,Singh Bdoi
10.3892/ijo.12.5.1199subject
Has Abstractpub_date
1998-05-01 00:00:00pages
1199-202issue
5eissn
1019-6439issn
1791-2423journal_volume
12pub_type
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