The RelA/p65 subunit of NF-κB specifically regulates cyclin D1 protein stability: Implications for cell cycle withdrawal and skeletal myogenesis

Document Type

Article

Abstract

Studies support that NF-κB functions in cellular growth through the transcriptional regulation of cyclin D1 but whether such regulation is attributed to a single NF-B κsubunit remains unclear. To address this issue we examined endogenous cyclin D1 levels during cell cycle reentry in mouse embryonic fibroblasts (MEFs) lacking specific NF-B κsignaling subunits. Results showed that each of these subunits were dispensable for regulating cyclin D1 transcription. However' we found that resulting cyclin D1 protein was severely reduced in MEFs lacking only RelA/p65. Cyclohexamide treatment revealed that this regulation was due to an increase in protein turnover. Similar downregulation of cyclin D1 protein' but not RNA' was observed in vivo in multiple tissues lacking RelA/p65. Co-immunoprecipitation analysis also showed that RelA/p65 and cyclin D1 were capable of interacting' thus providing a possible explanation for cyclin D1 protein stability. In addition, although the decrease in cyclin D1 in RelA/p65-/- MEFs was concomitant with lower CDK4 activity during cell cycle re-entry, this was not sufficient to affect S phase progression. Nevertheless' similar decreases in cyclin D1 protein in primary RelA/p65-/- myoblasts was adequate to accelerate cell cycle exit and differentiation of these cells. Based on these findings we conclude that RelA/p65 functions as a specific regulator of cyclin D1 protein stability' necessary for proper cell cycle withdrawal during skeletal myogenesis. J. Cell. Biochem. 106: 42-51, 2009. © 2008 Wiley-Liss, Inc.

Keywords

Cell cycle, Myogenesis, Nf-kappa b; Cyclin D1, P65, Protein stability, RelA

Publication Date

1-1-2009

Publication Title

Journal of Cellular Biochemistry

ISSN

07302312

E-ISSN

10974644

Volume

106

Issue

1

First Page

42

Last Page

51

PubMed ID

19016262

Digital Object Identifier (DOI)

10.1002/jcb.21976

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