TGF-beta-activated kinase 1 signaling maintains intestinal integrity by preventing accumulation of reactive oxygen species in the intestinal epithelium.
The intestinal epithelium is constantly exposed to inducers of reactive oxygen species (ROS), such as commensal microorganisms. Levels of ROS are normally maintained at nontoxic levels, but dysregulation of ROS is involved in intestinal inflammatory diseases. In this article, we report that TGF-β-activated kinase 1 (TAK1) is a key regulator of ROS in the intestinal epithelium. tak1 gene deletion in the mouse intestinal epithelium caused tissue damage involving enterocyte apoptosis, disruption of tight junctions, and inflammation. Disruption of TNF signaling, which is a major intestinal damage inducer, rescued the inflammatory conditions but not apoptosis or disruption of tight junctions in the TAK1-deficient intestinal epithelium, suggesting that TNF is not a primary inducer of the damage noted in TAK1-deficient intestinal epithelium. We found that TAK1 deficiency resulted in reduced expression of several antioxidant-responsive genes and reduced the protein level of a key antioxidant transcription factor NF-E2-related factor 2, which resulted in accumulation of ROS. Exogenous antioxidant treatment reduced apoptosis and disruption of tight junctions in the TAK1-deficient intestinal epithelium. Thus, TAK1 signaling regulates ROS through transcription factor NF-E2-related factor 2, which is important for intestinal epithelial integrity.
Kajino-Sakamoto
Rie
R
Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695, USA.
Omori
Emily
E
Nighot
Prashant K
PK
Blikslager
Anthony T
AT
Matsumoto
Kunihiro
K
Ninomiya-Tsuji
Jun
J
D000818:Animals; D015153:Blotting, Western; D004848:Epithelium / Q000201:enzymology / Q000276:immunology; D015870:Gene Expression; D005786:Gene Expression Regulation / Q000276:immunology; D018928:Immunity, Mucosal / Q000502:physiology*; D007150:Immunohistochemistry; D007413:Intestinal Mucosa / Q000201:enzymology* / Q000276:immunology; D020930:MAP Kinase Kinase Kinases / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D051267:NF-E2-Related Factor 2 / Q000276:immunology / Q000378:metabolism*; D018384:Oxidative Stress / Q000276:immunology; D017382:Reactive Oxygen Species / Q000276:immunology / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D000099151:MAP Kinase Kinase Kinase 7
D020930:MAP Kinase Kinase Kinases; D051267:NF-E2-Related Factor 2; D017382:Reactive Oxygen Species; D000099151:MAP Kinase Kinase Kinase 7