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Xue M, Shi Y, Pang A, Men L, Hu Y, Zhou P, Long G, Tian X, Wang R, Zhao Y, Liao X, Shen Y, Cui Y. Corin plays a protective role via upregulating MAPK and downregulating eNOS in diabetic nephropathy endothelial dysfunction. FASEB J 2019; 34:95-106. [PMID: 31914697 DOI: 10.1096/fj.201900531rr] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 09/22/2019] [Accepted: 09/30/2019] [Indexed: 12/14/2022]
Abstract
Diabetic nephropathy (DN) is one of the leading causes of mortality in diabetic patients, but its pathogenesis is unclear. We aimed to study the role of the pro-ANP convertase Corin in the pathogenesis of DN. Corin and ANP expression in DN rat kidneys and high-glucose-treated HK-2 cells was analyzed by real-time PCR, western blotting, and immunohistochemical staining. The effect of Corin-siRNA or ANP-siRNA HK-2 cells on EA.hy926 cell migration was determined by scratch-wound healing assay. The expression of mitogen-activated protein kinase (MAPK) and endothelial NO synthase (eNOS) in EA.hy926 cells treated with conditioned medium from Corin-siRNA- or ANP-siRNA-transfected HK-2 cells was determined by western blotting. We found a significant reduction in Corin and ANP expression in DN rat kidneys. These results were recapitulated in HK-2 cells treated with high glucose. EA.hy926 cells treated with conditioned medium from Corin-deficient HK-2 cells had inhibited migration, increased MAPK activity, and decreased eNOS activity. Similar effects were observed with ANP-siRNA transfection. Finally, adding ANP to the Corin-deficient HK-2 conditioned medium rescued the above defects, indicating that Corin mediates its effects through ANP. In conclusion, Corin plays a renoprotective role through pro-ANP processing, and defects in Corin cause endothelial dysfunction through MAPK and eNOS signaling in DN.
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Affiliation(s)
- Meiting Xue
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China.,Key Laboratory of Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,Key Laboratory of Cancer Immunology and Biotherapy, Tianjin's Clinical Research Center for Cancer, Tianjin, China
| | - Yue Shi
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Aiming Pang
- State Key Laboratory of Experimental Hematology, Hematopoietic Stem Cell Transplantation Center, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Li Men
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yahui Hu
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Pengfei Zhou
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Guangfeng Long
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Xin Tian
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Rong Wang
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yonghua Zhao
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Xudong Liao
- Case Cardiovascular Research Institute, Case Western Reserve University School of Medicine, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Yanna Shen
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yujie Cui
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
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Huynh K, Bernardo BC, McMullen JR, Ritchie RH. Diabetic cardiomyopathy: mechanisms and new treatment strategies targeting antioxidant signaling pathways. Pharmacol Ther 2014; 142:375-415. [PMID: 24462787 DOI: 10.1016/j.pharmthera.2014.01.003] [Citation(s) in RCA: 404] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 01/08/2014] [Indexed: 12/14/2022]
Abstract
Cardiovascular disease is the primary cause of morbidity and mortality among the diabetic population. Both experimental and clinical evidence suggest that diabetic subjects are predisposed to a distinct cardiomyopathy, independent of concomitant macro- and microvascular disorders. 'Diabetic cardiomyopathy' is characterized by early impairments in diastolic function, accompanied by the development of cardiomyocyte hypertrophy, myocardial fibrosis and cardiomyocyte apoptosis. The pathophysiology underlying diabetes-induced cardiac damage is complex and multifactorial, with elevated oxidative stress as a key contributor. We now review the current evidence of molecular disturbances present in the diabetic heart, and their role in the development of diabetes-induced impairments in myocardial function and structure. Our focus incorporates both the contribution of increased reactive oxygen species production and reduced antioxidant defenses to diabetic cardiomyopathy, together with modulation of protein signaling pathways and the emerging role of protein O-GlcNAcylation and miRNA dysregulation in the progression of diabetic heart disease. Lastly, we discuss both conventional and novel therapeutic approaches for the treatment of left ventricular dysfunction in diabetic patients, from inhibition of the renin-angiotensin-aldosterone-system, through recent evidence favoring supplementation of endogenous antioxidants for the treatment of diabetic cardiomyopathy. Novel therapeutic strategies, such as gene therapy targeting the phosphoinositide 3-kinase PI3K(p110α) signaling pathway, and miRNA dysregulation, are also reviewed. Targeting redox stress and protective protein signaling pathways may represent a future strategy for combating the ever-increasing incidence of heart failure in the diabetic population.
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Affiliation(s)
- Karina Huynh
- Baker IDI Heart & Diabetes Institute, Melbourne, Australia; Department of Medicine, Monash University, Clayton, Victoria, Australia
| | | | - Julie R McMullen
- Baker IDI Heart & Diabetes Institute, Melbourne, Australia; Department of Medicine, Monash University, Clayton, Victoria, Australia; Department of Physiology, Monash University, Clayton, Victoria, Australia.
| | - Rebecca H Ritchie
- Baker IDI Heart & Diabetes Institute, Melbourne, Australia; Department of Medicine, Monash University, Clayton, Victoria, Australia.
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Bourgoin F, Bachelard H, Badeau M, Larivière R, Nadeau A, Pitre M. Effects of tempol on endothelial and vascular dysfunctions and insulin resistance induced by a high-fat high-sucrose diet in the rat. Can J Physiol Pharmacol 2013; 91:547-61. [DOI: 10.1139/cjpp-2012-0273] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated the effects of treatment with tempol (an antioxidant) on vascular and metabolic dysfunction induced by a high-fat high-sucrose (HFHS) diet. Rats were randomized to receive an HFHS or chow diet with or without tempol treatment (1.5 mmol·(kg body mass)−1·day−1) for 4 weeks. Blood pressure, heart rate, and blood flow were measured in the rats by using intravascular catheters and Doppler flow probes. Insulin sensitivity and vascular responses to insulin were assessed during a euglycemic–hyperinsulinemic clamp. In-vitro studies were performed to evaluate vascular reactivity and endothelial and inducible nitric oxide synthase (eNOS; iNOS) expression in vascular and muscle tissues. Endothelin, nitrotyrosine, and NAD(P)H oxidase expressions were determined in vascular tissues, and glucose transport activity and glucose transporter 4 (GLUT4) expression were examined in muscles. Tempol treatment was found to prevent alterations in insulin sensitivity, glucose transport activity, GLUT4 expression, and vascular reactivity, and to prevent increases in plasma insulin, blood pressure, and heart rate noted in the untreated HFHS-fed rats. These were associated with increased levels of eNOS expression in vascular and muscle tissues, but reductions in nitrotyrosine, endothelin, NAD(P)H oxidase, and iNOS expressions. Therefore, oxidative stress induced by a relatively short-term HFHS diet could contribute to the early development of vascular and metabolic abnormalities in rats.
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Affiliation(s)
- Frédéric Bourgoin
- Endocrinology and Nephrology Axis, CHUQ Research Center from the CHUL, Department of Medicine, Laval University, 2705 Laurier boulevard, Québec, QC G1V 4G2, Canada
| | - Hélène Bachelard
- Endocrinology and Nephrology Axis, CHUQ Research Center from the CHUL, Department of Medicine, Laval University, 2705 Laurier boulevard, Québec, QC G1V 4G2, Canada
| | - Mylène Badeau
- Endocrinology and Nephrology Axis, CHUQ Research Center from the CHUL, Department of Medicine, Laval University, 2705 Laurier boulevard, Québec, QC G1V 4G2, Canada
| | - Richard Larivière
- Division of Nephrology and Hypertension, CHUQ Research Center from the Hôtel-Dieu de Québec, Department of Medicine, Faculty of Medicine, Laval University, Québec, Canada
| | - André Nadeau
- Endocrinology and Nephrology Axis, CHUQ Research Center from the CHUL, Department of Medicine, Laval University, 2705 Laurier boulevard, Québec, QC G1V 4G2, Canada
| | - Maryse Pitre
- Endocrinology and Nephrology Axis, CHUQ Research Center from the CHUL, Department of Medicine, Laval University, 2705 Laurier boulevard, Québec, QC G1V 4G2, Canada
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Marrachelli VG, Centeno JM, Miranda I, Castelló-Ruiz M, Burguete MC, Jover-Mengual T, Salom JB, Torregrosa G, Miranda FJ, Alborch E. Diabetes impairs the atrial natriuretic peptide relaxant action mediated by potassium channels and prostacyclin in the rabbit renal artery. Pharmacol Res 2012; 66:392-400. [DOI: 10.1016/j.phrs.2012.07.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 07/23/2012] [Accepted: 07/30/2012] [Indexed: 01/11/2023]
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Leo CH, Joshi A, Hart JL, Woodman OL. Endothelium-dependent nitroxyl-mediated relaxation is resistant to superoxide anion scavenging and preserved in diabetic rat aorta. Pharmacol Res 2012; 66:383-91. [PMID: 22898326 DOI: 10.1016/j.phrs.2012.07.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 07/30/2012] [Accepted: 07/30/2012] [Indexed: 10/28/2022]
Abstract
The aim of the study was to investigate whether diabetes-induced oxidant stress affects the contribution of nitroxyl (HNO) to endothelium-dependent relaxation in the rat aorta. Organ bath techniques were employed to determine vascular function of rat aorta. Pharmacological tools (3mM l-cysteine, 5mM 4-aminopyridine (4-AP), 200μM carboxy-PTIO and 100μM hydroxocobalamin, HXC) were used to distinguish between NO and HNO-mediated relaxation. Superoxide anion levels were determined by lucigenin-enhanced chemiluminescence. In the diabetic aorta, where there is increased superoxide anion production, responses to the endothelium-dependent relaxant ACh were not affected when the contribution of NO to relaxation was abolished by either HXC or carboxy-PTIO, indicating a preserved HNO-mediated relaxation. Conversely, when the contribution of HNO was inhibited with l-cysteine or 4-AP, the sensitivity and maximum relaxation to ACh was significantly decreased, suggesting that the contribution of NO was impaired by diabetes. Furthermore, whereas HNO appears to be derived from eNOS in normal aorta, in the diabetic aorta it may also arise from an eNOS-independent source, perhaps derived from nitrosothiol stores. Similarly, exposure to the superoxide anion generator, pyrogallol (100μM) significantly reduced the sensitivity to the NO donor, DEANONOate and ACh-induced NO-mediated relaxation but had no effect on responses to the HNO donor, Angeli's salt and ACh-induced HNO-mediated relaxation in the rat aorta. These findings demonstrate that NO-mediated relaxation is impaired during oxidative stress but the HNO component of relaxation is preserved under those conditions.
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Affiliation(s)
- C H Leo
- School of Medical Sciences, Health Innovations Research Institute, RMIT University, Bundoora, Victoria, Australia
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Abstract
Cardiovascular autonomic neuropathy (CAN), in which patients present with damage of autonomic nerve fibres, is one of the most common complications of diabetes. CAN leads to abnormalities in heart rate and vascular dynamics, which are features of diabetic heart failure. Dysregulated neurohormonal activation, an outcome of diabetic neuropathy, has a significant pathophysiological role in diabetes-associated cardiovascular disease. Key players in neurohormonal activation include cardioprotective neuropeptides and their receptors, such as substance P (SP), neuropeptide Y (NPY), calcitonin-gene-related peptide (CGRP), atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP) and C-type natriuretic peptide (CNP). These neuropeptides are released from the peripheral or autonomic nervous system and have vasoactive properties. They are further implicated in cardiomyocyte hypertrophy, calcium homeostasis, ischaemia-induced angiogenesis, protein kinase C signalling and the renin-angiotensin-aldosterone system. Therefore, dysregulation of the expression of neuropeptides or activation of the neuropeptide signalling pathways can negatively affect cardiac homeostasis. Targeting neuropeptides and their signalling pathways might thus serve as new therapeutic interventions in the treatment of heart failure associated with diabetes. This review discusses how neuropeptide dysregulation in diabetes might affect cardiac functions that contribute to the development of heart failure.
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Leo CH, Hart JL, Woodman OL. 3′,4′-Dihydroxyflavonol restores endothelium-dependent relaxation in small mesenteric artery from rats with type 1 and type 2 diabetes. Eur J Pharmacol 2011; 659:193-8. [DOI: 10.1016/j.ejphar.2011.03.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 02/22/2011] [Accepted: 03/15/2011] [Indexed: 02/07/2023]
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Malakul W, Thirawarapan S, Ingkaninan K, Sawasdee P. Effects of Kaempferia parviflora Wall. Ex Baker on endothelial dysfunction in streptozotocin-induced diabetic rats. JOURNAL OF ETHNOPHARMACOLOGY 2011; 133:371-377. [PMID: 20959137 DOI: 10.1016/j.jep.2010.10.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 08/18/2010] [Accepted: 10/05/2010] [Indexed: 05/30/2023]
Abstract
AIM OF THE STUDY The aim of the present study was to investigate an ethanolic extract of Kaempferia parviflora (KPE) reduces oxidative stress and preserves endothelial function in aortae from diabetic rats. MATERIALS AND METHODS Diabetes was induced in Sprague-Dawley rats by streptozotocin (STZ) treatment (55 mg/kg i.v.). Vascular reactivity and superoxide generation were assessed in aortic rings using standard organ bath techniques and lucigenin-enhanced chemiluminescence, respectively. RESULTS Eight weeks after STZ treatment blood glucose was elevated compared to citrate treated control rats and there was an increased aortic generation of superoxide anion. In aortic rings acetylcholine-induced relaxation was impaired whereas endothelium-independent relaxation to sodium nitroprusside was unaffected. When aortic rings were acutely exposed to KPE (1, 10 and 100 μg/ml) there was a significant reduction in the detection of superoxide anion and enhanced relaxation to acetylcholine. Two separate groups of rats (control and diabetic) were orally administered daily with KPE (100 mg/kg body weight) for 4 weeks. KPE treatment reduced superoxide generation and increased the nitrite levels in diabetic aortae, and enhanced acetylcholine-induced relaxation. In the presence of N(G)-nitro-L-arginine (L-NNA), the relaxation to acetylcholine in aortic rings of diabetic rats was only partially inhibited, but was totally abolished in aortic rings from the KPE-treated diabetic rats. Indomethacin did not affect relaxation to acetylcholine in aortic rings of any group. CONCLUSIONS These results suggest that KPE, acutely in vitro or after 4 weeks administration in vivo, reduces oxidant stress, increases NO bioavailability and preserves endothelium-dependent relaxation in aortae from diabetic rats.
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Affiliation(s)
- Wachirawadee Malakul
- Department of Physiology, Faculty of Medical Sciences, Naresuan University, Muang, Phitsanulok 65000, Thailand.
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Fatehi-Hassanabad Z, Chan CB, Furman BL. Reactive oxygen species and endothelial function in diabetes. Eur J Pharmacol 2010; 636:8-17. [DOI: 10.1016/j.ejphar.2010.03.048] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2009] [Revised: 02/27/2010] [Accepted: 03/22/2010] [Indexed: 02/07/2023]
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3',4'-Dihydroxyflavonol prevents diabetes-induced endothelial dysfunction in rat aorta. Life Sci 2009; 85:54-9. [PMID: 19409910 DOI: 10.1016/j.lfs.2009.04.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Revised: 03/31/2009] [Accepted: 04/25/2009] [Indexed: 02/07/2023]
Abstract
AIMS Diabetes increases oxidant stress and impairs endothelium-dependent relaxation. We investigated whether the antioxidant 3',4'-dihydroxyflavonol (DiOHF) reduces the release of superoxide (O(2)(-)) and preserves endothelial function in aortae from diabetic rats. MAIN METHODS Type-1 diabetes was induced in Sprague-Dawley rats by streptozotocin (STZ) treatment (55 mg/kg i.v.) and vascular reactivity and superoxide generation were assessed in aortic rings using standard organ bath techniques and lucigenin-enhanced chemiluminescence respectively. KEY FINDINGS Eight weeks after STZ treatment blood glucose was elevated (39.4+/-0.4 mM) compared to citrate treated control rats (5.5+/-0.1 mM, P<0.05) and there was an increased aortic generation of O(2)(-) (control 670+/-101, diabetic 1535+/-249 units/mg dry weight, P<0.05). In aortic rings acetylcholine (ACh)-induced relaxation was impaired (R(max) control 78+/-2, diabetic 66+/-3%, P<0.01) whereas endothelium-independent relaxation to sodium nitroprusside (SNP) was unaffected (R(max) control 100+/-1, diabetic 101+/-2%). When aortic rings were acutely exposed to DiOHF (10(-5) M) there was a significant reduction in the detection of O(2)(-) (control 124+/-15, diabetic 165+/-21 units/mg, P<0.01) and enhanced relaxation to ACh (R(max) control 84+/-3, diabetic 87+/-3%). Two separate groups of rats (control and diabetic) were treated daily with DiOHF (5 mg/kg i.p.) for 7 days. DiOHF treatment reduced superoxide generation in diabetic aortae (untreated diabetic 1471+/-358, DiOHF-treated diabetic 580+/-115 units/mg, P<0.05) and enhanced acetylcholine-induced relaxation (R(max) untreated diabetic 58+/-5, DiOHF-treated diabetic 71+/-4%, P<0.05). SIGNIFICANCE DiOHF, acutely in vitro or after 1 week treatment in vivo, reduces oxidant stress and preserves endothelium-dependent relaxation in aortae from diabetic rats.
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