Format

Send to

Choose Destination
FASEB J. 2005 Mar;19(3):362-70.

TNF-alpha acts via p38 MAPK to stimulate expression of the ubiquitin ligase atrogin1/MAFbx in skeletal muscle.

Author information

1
Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA. yiping@bcm.tmc.edu
2
U KY, Lexington

Abstract

Atrogin1/MAFbx is an ubiquitin ligase that mediates muscle atrophy in a variety of catabolic states. We recently found that H2O2 stimulates atrogin1/MAFbx gene expression. Since the cytokine tumor necrosis factor-alpha (TNF-alpha) stimulates both reactive oxygen production and general activity of the ubiquitin conjugating pathway, we hypothesized that TNF-alpha would also increase atrogin1/MAFbx gene expression. As with H2O2, we found that TNF-alpha exposure up-regulates atrogin1/MAFbx mRNA within 2 h in C2C12 myotubes. Intraperitoneal injection of TNF-alpha increased atrogin1/MAFbx mRNA in skeletal muscle of adult mice within 4 h. Exposing myotubes to either TNF-alpha or H2O2 also produced general activation of the mitogen-activated protein kinases (MAPKs): p38, ERK1/2, and JNK. The increase in atrogin1/MAFbx gene expression induced by TNF-alpha was not altered significantly by ERK inhibitor PD98059 or the JNK inhibitor SP600125. In contrast, atrogin1/MAFbx up-regulation and the associated increase in ubiquitin conjugating activity were both blunted by p38 inhibitors, either SB203580 or curcumin. These data suggest that TNF-alpha acts via p38 to increase atrogin1/MAFbx gene expression in skeletal muscle.

PMID:
15746179
PMCID:
PMC3099533
DOI:
10.1096/fj.04-2364com
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Atypon Icon for PubMed Central
Loading ...
Support Center