TY - JOUR
T1 - Myeloid-derived cullin 3 promotes STAT3 phosphorylation by inhibiting OGT expression and protects against intestinal inflammation
AU - Li, Xinghui
AU - Zhang, Zhibin
AU - Li, Lupeng
AU - Gong, Wei
AU - Lazenby, Audrey J.
AU - Swanson, Benjamin J.
AU - Herring, Laura E.
AU - Asara, John M.
AU - Singer, Jeffrey D.
AU - Wen, Haitao
N1 - Funding Information:
We thank Hung-Ching Hsia from Dr. Albert Baldwin's laboratory for STAT3 plasmids and Drs. Xiaochun Yu and Xiaoyong Yang for OGT plasmid. We thank Drs. Lee Graves and David Smalley from UNC Proteomics Core Facility for MS analysis, Dr. Yan Shi from the UNC Genomics Core Facility for microarray experiment, Dr. Joel Parker from the UNC Lineberger Cancer Center for microarray data analysis, and Min Yuan and Susanne Breitkopf for metabolomics experiments. We acknowledge Drs. Nat Moorman, Ben Major, Michael Emanuele, George Booz, and Lance Wells for helpful discussions. This work was supported by National Institutes of Health grants K01DK098307 (to H. Wen), 5P01CA120964 (to J.M. Asara), and 5P30CA006516 (to J.M. Asara). The authors declare no competing financial interests
PY - 2017/4/1
Y1 - 2017/4/1
N2 - Signal transducer and activator of transcription 3 (STAT3) is a key mediator of intestinal inflammation and tumorigenesis. However, the molecular mechanism that modulates STAT3 phosphorylation and activation is not fully understood. Here, we demonstrate that modification of STAT3 with O-linked β-N-acetylglucosamine (O-GlcNAc) on threonine 717 (T717) negatively regulates its phosphorylation and targets gene expression in macrophages. We further found that cullin 3 (CUL3), a cullin family E3 ubiquitin ligase, down-regulates the expression of the O-GlcNAc transferase (OGT) and inhibits STAT3 OGlcNAcylation. The inhibitory effect of CUL3 on OGT expression is dependent on nuclear factor E2-related factor-2 (Nrf2), which binds to the Ogt promoter region and increases gene transcription. Myeloid deletion of Cul3 led to defective STAT3 phosphorylation in colon macrophages, which was accompanied by exacerbated colonic inflammation and inflammation-driven tumorigenesis. Thus, this study identifies a new form of posttranslational modification of STAT3, modulating its phosphorylation, and suggests the importance of immunometabolism on colonic inflammation and tumorigenesis.
AB - Signal transducer and activator of transcription 3 (STAT3) is a key mediator of intestinal inflammation and tumorigenesis. However, the molecular mechanism that modulates STAT3 phosphorylation and activation is not fully understood. Here, we demonstrate that modification of STAT3 with O-linked β-N-acetylglucosamine (O-GlcNAc) on threonine 717 (T717) negatively regulates its phosphorylation and targets gene expression in macrophages. We further found that cullin 3 (CUL3), a cullin family E3 ubiquitin ligase, down-regulates the expression of the O-GlcNAc transferase (OGT) and inhibits STAT3 OGlcNAcylation. The inhibitory effect of CUL3 on OGT expression is dependent on nuclear factor E2-related factor-2 (Nrf2), which binds to the Ogt promoter region and increases gene transcription. Myeloid deletion of Cul3 led to defective STAT3 phosphorylation in colon macrophages, which was accompanied by exacerbated colonic inflammation and inflammation-driven tumorigenesis. Thus, this study identifies a new form of posttranslational modification of STAT3, modulating its phosphorylation, and suggests the importance of immunometabolism on colonic inflammation and tumorigenesis.
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U2 - 10.1084/jem.20161105
DO - 10.1084/jem.20161105
M3 - Article
C2 - 28280036
AN - SCOPUS:85021987003
VL - 214
SP - 1093
EP - 1109
JO - Journal of Experimental Medicine
JF - Journal of Experimental Medicine
SN - 0022-1007
IS - 4
ER -