Prolific generation of NO by inducible nitric oxide synthase (iNOS) can cause unintended injury to host cells during glomerulonephritis and other inflammatory diseases. While much is known about the mechanisms of iNOS induction, few transcriptional repressors have been found. We explored the role of signal transducers and activators of transcription 3 (STAT3) proteins in interleukin (IL)-1β- and lipopolysaccharide (LPS)+interferon (IFN)-γ-mediated iNOS induction in murine mesangial cells. Both stimuli induced rapid phosphorylation of STAT3 and sequence-specific STAT3 DNA-binding activity. Supershift assays with a STAT3 element probe demonstrated that nuclear factor κB (NF-κB) p65 and p50 complexed with STAT3 in the DNA—protein complex. The direct interaction of STAT3 and NF-κB p65 was verified in vivo by co-immunoprecipitation and in vitro by pull-down assays with glutathione S-transferase-NF-κB p65 fusion protein and in vitro-translated STAT3α. Overexpression of STAT3 dramatically inhibited IL-1β- or LPS+IFN-γ-mediated induction of iNOS promoter-luciferase constructs that contained the wild-type iNOS promoter or ones harbouring mutated STAT-binding elements. In tests of indirect inhibitory effects of STAT3, overexpression of STAT3 dramatically inhibited the activity of an NF-κB-dependent promoter devoid of STAT-binding elements without affecting NF-κB DNA-binding activity. Thus STAT3, via direct interactions with NF-κB p65, serves as a dominant-negative inhibitor of NF-κB activity to suppress indirectly cytokine induction of the iNOS promoter in mesangial cells. These results provide a new model for the termination of NO production by activated iNOS following exposure to pro-inflammatory stimuli.
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October 2002
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Research Article|
October 01 2002
Signal transducers and activators of transcription 3 (STAT3) inhibits transcription of the inducible nitric oxide synthase gene by interacting with nuclear factor κB Available to Purchase
Zhiyuan YU;
Zhiyuan YU
Departments of Internal Medicine and of Integrative Biology, Pharmacology and Physiology, The University of Texas Medical School at Houston, 6431 Fannin, MSB 4.148, Houston, TX 77030, U.S.A.
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Wenzheng ZHANG;
Wenzheng ZHANG
Departments of Internal Medicine and of Integrative Biology, Pharmacology and Physiology, The University of Texas Medical School at Houston, 6431 Fannin, MSB 4.148, Houston, TX 77030, U.S.A.
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Bruce C. KONE
Bruce C. KONE
1
Departments of Internal Medicine and of Integrative Biology, Pharmacology and Physiology, The University of Texas Medical School at Houston, 6431 Fannin, MSB 4.148, Houston, TX 77030, U.S.A.
1To whom correspondence should be addressed (e-mail [email protected]).
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Publisher: Portland Press Ltd
Received:
April 12 2002
Revision Received:
May 29 2002
Accepted:
June 11 2002
Accepted Manuscript online:
June 11 2002
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London ©2002
2002
Biochem J (2002) 367 (1): 97–105.
Article history
Received:
April 12 2002
Revision Received:
May 29 2002
Accepted:
June 11 2002
Accepted Manuscript online:
June 11 2002
Citation
Zhiyuan YU, Wenzheng ZHANG, Bruce C. KONE; Signal transducers and activators of transcription 3 (STAT3) inhibits transcription of the inducible nitric oxide synthase gene by interacting with nuclear factor κB. Biochem J 1 October 2002; 367 (1): 97–105. doi: https://doi.org/10.1042/bj20020588
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