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- W2130024105 abstract "Lamina-associated polypeptide (LAP) 2alpha is a nonmembrane-bound LAP2 isoform that forms complexes with nucleoplasmic A-type lamins. In this study, we show that the overexpression of LAP2alpha in fibroblasts reduced proliferation and delayed entry into the cell cycle from a G0 arrest. In contrast, stable down-regulation of LAP2alpha by RNA interference accelerated proliferation and interfered with cell cycle exit upon serum starvation. The LAP2alpha-linked cell cycle phenotype is mediated by the retinoblastoma (Rb) protein because the LAP2alpha COOH terminus directly bound Rb, and overexpressed LAP2alpha inhibited E2F/Rb-dependent reporter gene activity in G1 phase in an Rb-dependent manner. Furthermore, LAP2alpha associated with promoter sequences in endogenous E2F/Rb-dependent target genes in vivo and negatively affected their expression. In addition, the expression of LAP2alpha in proliferating preadipocytes caused the accumulation of hypophosphorylated Rb, which is reminiscent of noncycling cells, and initiated partial differentiation into adipocytes. The effects of LAP2alpha on cell cycle progression and differentiation may be highly relevant for the cell- and tissue-specific phenotypes observed in laminopathic diseases." @default.
- W2130024105 created "2016-06-24" @default.
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- W2130024105 date "2006-04-10" @default.
- W2130024105 modified "2023-09-24" @default.
- W2130024105 title "Lamina-associated polypeptide 2α regulates cell cycle progression and differentiation via the retinoblastoma–E2F pathway" @default.
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- W2130024105 doi "https://doi.org/10.1083/jcb.200511149" @default.
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