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Mazur A, Guernec A, Lautridou J, Dupas J, Dugrenot E, Belhomme M, Theron M, Guerrero F. Angiotensin Converting Enzyme Inhibitor Has a Protective Effect on Decompression Sickness in Rats. Front Physiol 2018; 9:64. [PMID: 29545754 PMCID: PMC5838564 DOI: 10.3389/fphys.2018.00064] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 01/18/2018] [Indexed: 01/31/2023] Open
Abstract
Introduction: Commercial divers, high altitude pilots, and astronauts are exposed to some inherent risk of decompression sickness (DCS), though the mechanisms that trigger are still unclear. It has been previously showed that diving may induce increased levels of serum angiotensin converting enzyme. The renin angiotensin aldosterone system (RAAS) is one of the most important regulators of blood pressure and fluid volume. The purpose of the present study was to control the influence of angiotensin II on the appearance of DCS. Methods: Sprague Dawley rats have been pre-treated with inhibitor of angiotensin II receptor type 1 (losartan; 10 mg/kg), angiotensin-converting enzyme (ACE) inhibitor (enalapril; 10 mg/kg), and calcium-entry blocker (nifedipine; 20 mg/kg). The experimental groups were treated for 4 weeks before exposure to hyperbaric pressure while controls were not treated. Seventy-five rats were subjected to a simulated dive at 1000 kPa absolute pressure for 45 min before starting decompression. Clinical assessment took place over a period of 60 min after surfacing. Blood samples were collected for measurements of TBARS, interleukin 6 (IL-6), angiotensin II (ANG II) and ACE. Results: The diving protocol induced 60% DCS in non-treated animals. This ratio was significantly decreased after treatment with enalapril, but not other vasoactive drugs. Enalapril did not change ANG II or ACE concentration, while losartant decreased post dive level of ACE but not ANG II. None of the treatment modified the effect of diving on TBARS and IL-6 values. Conclusion: Results suggests that the rennin angiotensin system is involved in a process of triggering DCS but this has to be further investigated. However, a vasorelaxation mediated process, which potentially could increase the load of inert gas during hyperbaric exposure, and antioxidant properties were excluded by our results.
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Affiliation(s)
- Aleksandra Mazur
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - Anthony Guernec
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - Jacky Lautridou
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - Julie Dupas
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - Emmanuel Dugrenot
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - Marc Belhomme
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - Michael Theron
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
| | - François Guerrero
- EA4324 ORPHY, Institut Brestois Santé Agro Matière, Université de Bretagne Occidentale, Brest, France
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Understanding the mechanisms of angiotensin II signaling involved in hypertension and its long-term sequelae: insights from Bartter's and Gitelman's syndromes, human models of endogenous angiotensin II signaling antagonism. J Hypertens 2016; 32:2109-19; discussion 2119. [PMID: 25202962 DOI: 10.1097/hjh.0000000000000321] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Angiotensin II (Ang II) plays a key role in hypertension, renal and cardiovascular pathophysiology via intracellular pathways that involve the activation of a multiplicity of signaling mechanisms. Although experimental and genetic animal models have been developed and used to explore Ang II signaling's role in hypertension, a complete understanding of the processes mediating Ang II signaling in hypertension in humans remains elusive. One impediment is that these animal models do not exhibit all the traits of human hypertension, making it impossible to extrapolate from them to humans. To overcome this issue, we have used patients with Bartter's and Gitelman's syndromes, a human model of endogenously blunted and blocked Ang II signaling that presents a constellation of clinical findings which manifest themselves as the opposite of hypertension. This article reviews the aspects of the pathophysiology of human hypertension and its short and long term sequelae, and uses the results of our studies in Bartter's and Gitelman's syndromes along with those of others to gain better insight and understanding of the role of Ang II signaling in these processes.
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Calò LA, Maiolino G. Mechanistic approach to the pathophysiology of target organ damage in hypertension from studies in a human model with characteristics opposite to hypertension: Bartter's and Gitelman's syndromes. J Endocrinol Invest 2015; 38:711-6. [PMID: 25740064 DOI: 10.1007/s40618-015-0249-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 01/26/2015] [Indexed: 12/28/2022]
Abstract
INTRODUCTION Extensive studies using Bartter's/Gitelman's syndrome patients have provided insights into the angiotensin II (Ang II) signaling pathways involved in the regulation of vascular tone and cardiovascular-renal remodeling. The renin-angiotensin-aldosterone system is activated in these syndromes, however, patients do not develop hypertension and cardiovascular remodeling and clinically manifest conditions opposite to hypertension. The short- and the long-term signaling of Ang II remains an important matter of investigation to shed light on mechanisms responsible for the pathophysiology of hypertension and its long-term complications. The long-term signaling of Ang II is involved in the pathophysiology of cardiovascular-renal remodeling and inflammatory responses in which the balance between RhoA/Rho kinase pathway and NO system plays a crucial role. METHODS AND RESULTS In this brief review, the results of our studies in Bartter's and Gitelman's syndromes are reported on these processes. CONCLUSIONS The information obtained from these studies can clarify, confirm or be used to extend the biochemical mechanisms responsible for the pathophysiology of hypertension and its long-term complications and could offer further chances to identify additional potential significant targets of therapy.
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Affiliation(s)
- L A Calò
- Department of Medicine, Nephrology and Hypertension, University of Padova, Via Giustiniani, 2, 35128, Padua, Italy.
| | - G Maiolino
- Department of Medicine, Nephrology and Hypertension, University of Padova, Via Giustiniani, 2, 35128, Padua, Italy
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Angiotensin II and Cardiovascular-Renal Remodelling in Hypertension: Insights from a Human Model Opposite to Hypertension. High Blood Press Cardiovasc Prev 2015; 22:215-23. [PMID: 25759028 DOI: 10.1007/s40292-015-0082-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 03/04/2015] [Indexed: 01/20/2023] Open
Abstract
Insights into the Angiotensin II (Ang II) signalling pathways have been provided by extensive studies using Bartter's/Gitelman's syndromes patients. These syndromes are characterized by activation of the renin-angiotensin-aldosterone system but do not develop hypertension and cardiovascular remodelling, therefore represent a mirror image of hypertension and clinically manifest themselves as the opposite of hypertension. The short and the long-term signalling of Ang II remain an important matter of investigation to shed light on mechanisms responsible for the pathophysiology of hypertension and its long-term complications, such as cardiovascular remodelling and atherogenesis. In particular the long-term signalling of Ang II is involved in the pathophysiology of cardiovascular-renal remodelling, inflammatory and hypertrophic responses in which the relationship between RhoA/Rho kinase pathway and NO system plays a crucial role. This review reports the results of our studies in Bartter's and Gitelman's syndromes to get better insight these processes and the role of Ang II signaling. The information obtained from the studies in Bartter's/Gitelman's patients can, in fact, clarify, confirm or be used to gather more general data on the biochemical mechanisms responsible for the pathophysiology of hypertension and its long-term complications and could contribute to identify additional potential significant targets of therapy.
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Asirvatham-Jeyaraj N, King AJ, Northcott CA, Madan S, Fink GD. Cyclooxygenase-1 inhibition attenuates angiotensin II-salt hypertension and neurogenic pressor activity in the rat. Am J Physiol Heart Circ Physiol 2013; 305:H1462-70. [PMID: 24014677 DOI: 10.1152/ajpheart.00245.2013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Cyclooxygenase (COX)-derived prostanoids contribute to angiotensin II (ANG II) hypertension (HTN). However, the specific mechanisms by which prostanoids act are unclear. ANG II-induced HTN is caused partly by increased sympathetic nervous system activity, especially in a setting of high dietary salt intake. This study tested the hypothesis that COX-derived prostanoids cause ANG II-salt sympathoexcitation and HTN. Experiments were conducted in conscious rats. Infusion of ANG II (150 ng·kg(-1)·min(-1) sc) caused a marked HTN in rats on 2% salt diet, but a much smaller increase in blood pressure in rats on 0.4% salt diet. The nonselective COX inhibitor ketoprofen (2 mg/kg sc) given throughout the ANG-II infusion period attenuated HTN development in rats on 2% NaCl diet, but not in rats on 0.4% NaCl diet. The acute depressor response to ganglion blockade was used to assess neurogenic pressor activity in rats on 2% NaCl diet. Ketoprofen-treated rats showed a smaller fall in arterial pressure in response to ganglion blockade during ANG-II infusion than did nontreated controls. In additional experiments, ketoprofen-treated rats exhibited smaller increases in plasma norepinephrine levels and whole body norepinephrine spillover than we previously reported in ANG II-salt HTN. Finally, the effects of the selective COX-1 inhibitor SC560 (10 mg·kg(-1)·day(-1) ip) and the selective COX-2 inhibitor nimesulide (10 mg·kg(-1)·day(-1) ip) were investigated. Treatment with SC560 but not nimesulide significantly reduced blood pressure and the depressor response to ganglion blockade in ANG II-salt HTN rats. The results suggest that COX-1 products are critical for sympathoexcitation and the full development of ANG II-salt HTN in rats.
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Calò LA, Davis PA, Pagnin E, Dal Maso L, Caielli P, Rossi GP. Calcitonin gene-related peptide, heme oxygenase-1, endothelial progenitor cells and nitric oxide-dependent vasodilation relationships in a human model of angiotensin II type-1 receptor antagonism. J Hypertens 2012; 30:1406-13. [PMID: 22573121 DOI: 10.1097/hjh.0b013e32835414f7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE An increased number of endothelial progenitor cells (EPCs), which correlated with heme oxygenase-1 gene expression and nitric oxide-mediated vasodilation [flow-mediated dilation (FMD)], has been recently reported by us in Bartter/Gitelman syndromes, rare diseases that represent a human model of endogenous angiotensin (Ang) II type-1 receptor antagonism and depicting an opposite picture of hypertension. Calcitonin gene-related peptide (CGRP), which prevents circulating EPCs senescence and reverses Ang II-induced EPCs senescence is reduced in hypertensive patients, its level is stimulated by heme oxygenase-1 and is related with stimulation of nitric oxide. This study reports on CGRP concentration and heme oxygenase-1 protein level in Bartter/Gitelman syndrome's patients compared with healthy individuals and analyzes their relationships with EPCs [CD34⁺kinase insert domain receptor (KDR⁺), CD133⁺KDR⁺, CD34⁺CD133⁺KDR⁺) as well as FMD. METHODS AND RESULTS CGRP concentration (ELISA) and heme oxygenase-1 protein level (sandwich immunoassay) were higher in Bartter/Gitelman syndrome : 38.20 ± 8.23 pg/ml vs. 25.07 ± 3.51, P < 0.002 and 9.44 ± 3.1 ng/ml vs. 5.52 ± 1.1, P < 0.007, respectively. CD133⁺KDR⁺ and CD34⁺CD133⁺KDR⁺ (direct three-color flow cytometry analysis) and FMD (B-mode echo scan of brachial artery) were confirmed higher in Bartter/Gitelman syndrome. CGRP and heme oxygenase-1 strongly correlated (P < 0.0001) and did not differ by group. In Bartter/Gitelman syndrome, both CGRP and heme oxygenase-1 were strongly correlated with both EPCs and FMD. CONCLUSIONS Using a human model opposite to hypertension, this study provides information on the relationships between CGRP, heme oxygenase-1, FMD, major clinical and biochemical factors involved in cardiovascular disease, and EPC-specific populations and may also serve to confirm the utility of Bartter/Gitelman syndrome patients in delineating EPCs and related factors roles in the pathophysiology of cardiovascular remodeling in humans.
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Affiliation(s)
- Lorenzo A Calò
- Department of Medicine, Clinica Medica 4, University of Padova, Padova, Veneto, Italy
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Ortiz RM, Mamalis A, Navar LG. Aldosterone Receptor Antagonism Reduces Urinary C-Reactive Protein Excretion in Angiotensin II-Infused, Hypertensive Rats. ACTA ACUST UNITED AC 2012; 3:184-91. [PMID: 20161115 DOI: 10.1016/j.jash.2009.01.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Elevated C-reactive protein (CRP) may contribute to elevated arterial pressure in Ang II-dependent hypertension. However, the in vivo effects of Ang II and of mineralocorticoid receptor (MR) antagonism on CRP during Ang II-dependent hypertension have not been examined. In addition, urinary CRP excretion as a method to monitor the progression of Ang II-induced inflammation has not been evaluated. METHODS Urine samples were collected from three groups (n = 10/group) of rats: 1) normotensive control, 2) angiotensin II infused (Ang II; 60 ng/min), and 3) Ang II + eplerenone (epl; 25 mg/d). A diet containing epl (0.1 %) was provided after 1 week of Ang II infusion. RESULTS After 28 d, Ang II increased SBP from 136 +/- 5 to 207 +/- 8 mmHg; this response in SBP was not altered following MR antagonism (215 +/- 6 mmHg). Ang II-infusion increased plasma CRP from 14 +/- 2 to 26 +/- 3 mug/mL and increased urinary CRP excretion nearly 8-fold (143 +/- 26 vs 1102 +/- 115 ng/d). Treatment with eplerenone reduced plasma CRP by 25 % and urinary immunoreactive CRP (irCRP) by 34 % in Ang II-infused rats suggesting that aldosterone contributes to the CRP-associated inflammatory response in Ang II-dependent hypertension. CONCLUSIONS The increase in SBP preceded the increase in irCRP excretion by at least 4 days suggesting that CRP does not significantly contribute to increased arterial blood pressure in Ang II-dependent hypertension. The blockade of MR reduced plasma CRP and urinary irCRP excretion demonstrating the contribution of aldosterone to the Ang II-induced generation of CRP. Furthermore, urinary CRP may serve as a non-invasive index for monitoring cardiovascular inflammation during hypertension.
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Affiliation(s)
- Rudy M Ortiz
- Division of Natural Sciences, University of California, Merced CA
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Calò LA, Davis PA. The PGC1alpha-PPARdelta-HO-1 system: supporting evidence from studies in Bartter's/Gitelman's syndromes. Cardiovasc Res 2010; 86:535. [PMID: 20228397 DOI: 10.1093/cvr/cvq085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Abstract
The renin-angiotensin system (RAS) is usually associated with its systemic action on cardiovascular homoeostasis. However, recent studies suggest that at a local tissue level, the RAS influences tumour growth. The potential of the RAS as a target for cancer treatment and the suggested underlying mechanisms of its paracrine effects are reviewed here. These include modulation of angiogenesis, cellular proliferation, immune responses and extracellular matrix formation. Knowledge of the RAS has increased dramatically in recent years with the discovery of new enzymes, peptides and feedback mechanisms. The local RAS appears to influence tumour growth and metastases and there is evidence of tissue- and tumour-specific differences. Recent experimental studies provide strong evidence that drugs that inhibit the RAS have the potential to reduce cancer risk or retard tumour growth and metastases. Manipulation of the RAS may, therefore, provide a safe and inexpensive anticancer strategy.
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Affiliation(s)
- Eleanor I Ager
- Department of Surgery, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia.
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Calò LA, Puato M, Schiavo S, Zanardo M, Tirrito C, Pagnin E, Balbi G, Davis PA, Palatini P, Pauletto P. Absence of vascular remodelling in a high angiotensin-II state (Bartter's and Gitelman's syndromes): implications for angiotensin II signalling pathways. Nephrol Dial Transplant 2008; 23:2804-9. [PMID: 18344243 DOI: 10.1093/ndt/gfn118] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Angiotensin II (Ang II) is a powerful proinflammatory cytokine and growth factor that activates NF-kappaB, as well as NAD(P)H oxidase, and thus is a key factor for the induction and progression of cardiovascular diseases. Our previous studies have shown high Ang II and high blood pressure-driven proatherogenic remodelling in an animal model. To further explore Ang II in proatherogenic vascular remodelling independent of blood pressure, we used Bartter's/Gitelman's syndrome (BS/GS) patients given their elevated plasma Ang II, yet normo/hypotension, because extensive mechanistic studies in these patients suggest they are a good model to explore Ang II-mediated signalling. METHODS The study evaluated BS/GS patients for nitric oxide-dependent (FMD) and -independent vasodilation and intima-media thickness (IMT) of the carotid arteries compared with healthy subjects and essential hypertensive patients. RESULTS The results showed the absence of IMT growth in BS/GS patients as cumulative mean-IMT and mean maximum-IMT levels in BS/GS did not differ from normotensives: 0.58 +/- 0.09 mm versus 0.60 +/- 0.09 and 0.67 +/- 0.09 versus 0.70 +/- 0.13 respectively, P = ns, but were significantly lower compared with hypertensive patients: 0.69 +/- 0.13, P < 0.046 and 0.85 +/- 0.19, P < 0.018, respectively. FMD was increased in BS/GS versus hypertensives or normotensive controls (10.8 +/- 2.7% versus 6.5 +/- 2.3 and 8.7 +/- 1.9, P < 0.002 respectively) while endothelium-independent dilation did not differ (10.2 +/- 3.6% versus 7.2 +/- 1.9 and 8.2 +/- 3.3, P = ns) between groups. CONCLUSIONS Our study in BS/GS provides to our knowledge the first clinical data that point to a direct proatherogenic role for Ang II. However, because the data are derived from findings in BS/GS and therefore are indirect, further studies in this and other models using more direct approaches should be pursued to demonstrate a direct proatherogenic effect of Ang II as well as further studies on Ang II type 2 receptor (AT2R) signalling that the spectrum of findings of this and other studies indicate as involved in the lack of vascular remodelling.
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Affiliation(s)
- Lorenzo A Calò
- Department of Clinical and Experimental Medicine, Clinica Medica 4, University of Padova, Via Giustiniani, 2, 35128 Padova, Italy.
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Linking inflammation and hypertension in humans: studies in Bartter's/Gitelman's syndrome patients. J Hum Hypertens 2007; 22:223-5. [DOI: 10.1038/sj.jhh.1002309] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Calò LA, Davis PA, Palatini P, Semplicini A, Pessina AC. Urinary albumin excretion, endothelial dysfunction and cardiovascular risk: study in Bartter's/Gitelman's syndromes and relevance for hypertension. J Hum Hypertens 2007; 21:904-6. [PMID: 17495949 DOI: 10.1038/sj.jhh.1002231] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Calò LA, Pessina AC. RhoA/Rho-kinase pathway: much more than just a modulation of vascular tone. Evidence from studies in humans. J Hypertens 2007; 25:259-64. [PMID: 17211228 DOI: 10.1097/hjh.0b013e328010d4d2] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
RhoA/Rho-kinase signaling and its relationship/balance with the nitric oxide level, angiotensin II and vasopressors for cardiovascular pathophysiology is of increasing importance, and its involvement goes far beyond blood pressure regulation. The deep involvement of this pathway in cardiovascular biology is now known to include a wide spectrum of conditions relating to the long-term complications of hypertension, and in general of cardiovascular pathophysiology, such as changes in cardiovascular structure (remodeling) and the induction of atherosclerosis, involvement in the pathophysiological relationships between inflammation and hypertension, and in those between hypertension, glucose metabolism and insulin resistance. Studies from our laboratory have made an important contribution to the understanding of the cellular and molecular mechanisms mediated by the RhoA/Rho-kinase pathway, which include all the aspects of cardiovascular pathophysiology in which this pathway plays a role. In addition, if it is considered that our contribution to the clarification of these mechanisms only comes from studies in humans, their impact on the scenario of the RhoA/Rho-kinase pathway's biology, essentially supported by studies 'in vitro' or in animal models, is immediate. This review examines all the aspects of RhoA/Rho-kinase signaling in the light of the available data, and gives an updated and useful overall picture of its involvement in cardiovascular pathophysiology.
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Affiliation(s)
- Lorenzo A Calò
- Department of Clinical and Experimental Medicine, Clinica Medica 4, University of Padova, Padua, Italy.
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Pagnin E, Davis PA, Semplicini A, Calò LA. The search for a link between inflammation and hypertension—contribution from Bartter's/Gitelman's syndromes. Nephrol Dial Transplant 2006; 21:2340-2. [PMID: 16611677 DOI: 10.1093/ndt/gfl173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Calò LA, Pagnin E, Mussap M, Davis PA, Semplicini A. Rho/Rho-kinase and C-reactive protein relationship in hypertension and atherosclerosis. Nephrol Dial Transplant 2005; 21:1131-2. [PMID: 16287911 DOI: 10.1093/ndt/gfi272] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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