NOS1-derived Nitric Oxide Promotes NF-kB Stability And Transcriptional Activity By Inhibiting Suppressor Of Cytokine Signaling (SOCS-1) In Response To TLR4 Activation | 36099
Journal of Clinical & Cellular Immunology
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Nitric oxide synthases are a family of enzymes that catalyze the production of nitric oxide (NO) from L-arginine. NO is an
important cellular signaling molecule, having essential roles in many biological processes including the control of blood
pressure, regulation of neuronal activity and immune responses. NOS3 (endothelial NOS or e NOS) and NOS2 (inducible NOS
or I NOS) have been appreciated as mediators of inflammatory processes. However, considerably less is known about the role
of NOS1 (neuronal NOS or n NOS) in inflammation. We have uncovered an important role for this enzyme in regulating TLR4
signaling. We demonstrate that in contrast to the enhanced susceptibility of NOS2
-/- and NOS3
-/- mice to LPS, NOS1
are, in fact, more resistant to LPS-induced lethality and tissue injury. We demonstrate that the loss of NOS1 attenuates TLR4-
stimulated cytokine production and NF-κB activity in vivo and in vitro. Macrophages from NOS1
-/- animals demonstrate an
LPS-induced decrease in protein levels of the p65 subunit of NF-κB. This decrease in p65 protein correlates with an increase
in protein levels of suppressor of cytokine signaling-1 (SOCS1) and increased physical association between SOCS1 and p65.
On studying the mechanism of NOS1-regulation of inflammation we found that an early pulse of NOS1-derived NO was
required to stabilize p65 in the nucleus of macrophages via the inhibitory S-nitrosation of suppressor of Cytokine Signaling-1
(SOCS1). NOS1-derived NO through nitrosation of Cys147 and Cys179 on SOCS1 permits p65-mediated pro-inflammatory
gene transcription and is essential for the mechanism of inflammation. Taken together, our results demonstrate that NOS1 is a
fundamental early regulator of gene transcription of the inflammatory response thereby heavily impacting the course, type and
duration of the inflammatory process.
Mirza Saqib Baig has a research background in innate immunity and inflammation. Presently, he is working as a Scientist at the Department of Bioscience and Bioengineering, Indian Institute of Technology (IIT), India. Dr. Baig earned his Ph.D. from Central Drug Research Institute, India in 2009. Further, he underwent his postdoctoral training at the Department of Medicine, University of Illinois at Chicago and Mayo Clinic, Rochester, MN, USA. Dr. Baig has been honored with various international and national awards. He has published several research articles in peer-reviewed international Journals, including his recent cutting-edge findings in the Journal of Experimental Medicine (JEM).