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      JAK-STAT and the renin-angiotensin system : The role of the JAK-STAT pathway in blood pressure and intrarenal renin-angiotensin system regulation

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          Abstract

          The renin-angiotensin system (RAS) plays important roles in blood pressure control and tissue disease. An inappropriate local angiotensin II elevation in the kidneys leads to the development of hypertension, tissue damage and chronic injury. Studies have demonstrated that the JAK-STAT pathway mediates angiotensin II-triggered gene transcription. The JAK-STAT pathway in turn, acting as an amplifying system, contributes to further intrarenal RAS activation. These observations prompt the suggestion that the JAK-STAT pathway may be of importance in elucidating the mechanisms RAS-associated tissue injury. Accordingly, this review provides a brief overview of the interactions between the JAK-STAT pathway and the RAS, specifically the RAS expressed in the kidneys.

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          Angiotensin II stimulates extracellular matrix protein synthesis through induction of transforming growth factor-beta expression in rat glomerular mesangial cells.

          W Border, S Kagami, Joan W. Miller … (1994)
          Angiotensin II (Ang II) has been implicated in the development of progressive glomerulosclerosis, but the precise mechanism of this effect remains unclear. In an experimental model, we have shown previously that TGF-beta plays a key role in glomerulosclerosis by stimulating extracellular matrix protein synthesis, increasing matrix protein receptors, and altering protease/protease-inhibitor balance, thereby inhibiting matrix degradation. We hypothesized that Ang II contributes to glomerulosclerosis through induction of TGF-beta. Ang II treatment of rat mesangial cells in culture increased TGF-beta and matrix components biglycan, fibronectin, and collagen type I at both the mRNA and protein levels in a time- and dose-dependent manner. Saralasin, a competitive inhibitor of Ang II, prevented the stimulation. Ang II also promoted conversion of latent TGF-beta to the biologically active form. Coincubation of mesangial cells with Ang II and neutralizing antibody to TGF-beta blocked the Ang II-induced increases in matrix protein expression. Continuous in vivo administration of Ang II to normal rats for 7 d resulted in 70% increases in glomerular mRNA for both TGF-beta and collagen type I. These results indicate that Ang II induces mesangial cell synthesis of matrix proteins and show that these effects are mediated by Ang II induction of TGF-beta expression. This mechanism may well contribute to glomerulosclerosis in vivo.
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            STAT1 and STAT3 in tumorigenesis

            Lidia Avalle, Sara Pensa, Gabriella Regis … (2012)
            The transcription factors STAT1 and STAT3 appear to play opposite roles in tumorigenesis. While STAT3 promotes cell survival/proliferation, motility and immune tolerance and is considered as an oncogene, STAT1 mostly triggers anti-proliferative and pro-apoptotic responses while enhancing anti-tumor immunity. Despite being activated downstream of common cytokine and growth factor receptors, their activation is reciprocally regulated and perturbation in their balanced expression or phosphorylation levels may re-direct cytokine/growth factor signals from proliferative to apoptotic, or from inflammatory to anti-inflammatory. Here we review the functional canonical and non-canonical effects of STAT1 and STAT3 activation in tumorigenesis and their potential cross-regulation mechanisms.
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              Vascular inflammation and the renin-angiotensin system.

              Adrian Recinos III, Mohsen Eledrisi, Allan R. Brasier (2002)
              It is now well established that vascular inflammation is an independent risk factor for the development of atherosclerosis. In otherwise healthy patients, chronic elevations of circulating interleukin-6 or its biomarkers are predictors for increased risk in the development and progression of ischemic heart disease. Although multifactorial in etiology, vascular inflammation produces atherosclerosis by the continuous recruitment of circulating monocytes into the vessel wall and by contributing to an oxidant-rich inflammatory milieu that induces phenotypic changes in resident (noninflammatory) cells. In addition, the renin-angiotensin system (RAS) has important modulatory activities in the atherogenic process. Recent work has shown that angiotensin II (Ang II) has significant proinflammatory actions in the vascular wall, inducing the production of reactive oxygen species, inflammatory cytokines, and adhesion molecules. These latter effects on gene expression are mediated, at least in part, through the cytoplasmic nuclear factor-kappaB transcription factor. Through these actions, Ang II augments vascular inflammation, induces endothelial dysfunction, and, in so doing, enhances the atherogenic process. Our recent studies have defined a molecular mechanism for a biological positive-feedback loop that explains how vascular inflammation can be self-sustaining through upregulation of the vessel wall Ang II tone. Ang II produced locally by the inflamed vessel induces the synthesis and secretion of interleukin-6, a cytokine that induces synthesis of angiotensinogen in the liver through a janus kinase (JAK)/signal transducer and activator of transcription (STAT)-3 pathway. Enhanced angiotensinogen production, in turn, supplies more substrate to the activated vascular RAS, where locally produced Ang II synergizes with oxidized lipid to perpetuate atherosclerotic vascular inflammation. These observations suggest that one mechanism by which RAS antagonists prevent atherosclerosis is by reducing vascular inflammation. Moreover, antagonizing the vascular nuclear factor-kappaB and/or hepatic JAK/STAT pathways may modulate the atherosclerotic process.
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                Author and article information

                Journal
                Journal ID (nlm-ta): JAKSTAT
                Journal ID (iso-abbrev): JAKSTAT
                Journal ID (publisher-id): JKST
                Title: JAK-STAT
                Publisher: Landes Bioscience
                ISSN (Print): 2162-3988
                ISSN (Electronic): 2162-3996
                Publication date (Print): 01 October 2012
                Publication date (Electronic): 01 October 2012
                Publication date PMC-release: 01 October 2012
                Volume: 1
                Issue: 4
                Pages: 250-256
                Affiliations
                [1 ]Department of Physiology and Hypertension and Renal Center of Excellence; Tulane University Health Sciences Center; New Orleans, LA USA
                [2 ]Departments of Biomedical Sciences and Pathology and Laboratory Medicine; Cedars-Sinai Medical Center; Los Angeles, CA USA
                Author notes
                [* ]Correspondence to: Ryousuke Satou; E-mail: rsato@ 123456tulane.edu
                Article
                Publisher ID: 2012JAKS0046R Publisher Item ID: 22729
                DOI: 10.4161/jkst.22729
                PMC ID: 3670281
                PubMed ID: 24058780
                SO-VID: bdcaa039-ebf3-44a0-8150-dc1187f5dab9
                Copyright © Copyright © 2012 Landes Bioscience
                License:

                This is an open-access article licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. The article may be redistributed, reproduced, and reused for non-commercial purposes, provided the original source is properly cited.

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                Subject: Review

                Keywords: kidney,renin-angiotensin system,angiotensin ii,jak-stat pathway,angiotensinogen,hypertension
                Data availability:
                Keywords: kidney, renin-angiotensin system, angiotensin ii, jak-stat pathway, angiotensinogen, hypertension

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