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Bienvenu LA, Bell JR, Weeks KL, Delbridge LMD, Young MJ. New Perspectives on Sex Steroid and Mineralocorticoid Receptor Signaling in Cardiac Ischemic Injury. Front Physiol 2022; 13:896425. [PMID: 35846011 PMCID: PMC9277457 DOI: 10.3389/fphys.2022.896425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 05/27/2022] [Indexed: 11/13/2022] Open
Abstract
The global burden of ischemic heart disease is burgeoning for both men and women. Although advances have been made, the need for new sex-specific therapies targeting key differences in cardiovascular disease outcomes in men and women remains. Mineralocorticoid receptor directed treatments have been successfully used for blood pressure control and heart failure management and represent a potentially valuable therapeutic option for ischemic cardiac events. Clinical and experimental data indicate that mineralocorticoid excess or inappropriate mineralocorticoid receptor (MR) activation exacerbates ischemic damage, and many of the intracellular response pathways activated in ischemia and subsequent reperfusion are regulated by MR. In experimental contexts, where MR are abrogated genetically or mineralocorticoid signaling is suppressed pharmacologically, ischemic injury is alleviated, and reperfusion recovery is enhanced. In the chronic setting, mineralocorticoid signaling induces fibrosis, oxidative stress, and inflammation, which can predispose to ischemic events and exacerbate post-myocardial infarct pathologies. Whilst a range of cardiac cell types are involved in mineralocorticoid-mediated regulation of cardiac function, cardiomyocyte-specific MR signaling pathways are key. Selective inhibition of cardiomyocyte MR signaling improves electromechanical resilience during ischemia and enhances contractile recovery in reperfusion. Emerging evidence suggests that the MR also contribute to sex-specific aspects of ischemic vulnerability. Indeed, MR interactions with sex steroid receptors may differentially regulate myocardial nitric oxide bioavailability in males and females, potentially determining sex-specific post-ischemic outcomes. There is hence considerable impetus for exploration of MR directed, cell specific therapies for both women and men in order to improve ischemic heart disease outcomes.
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Affiliation(s)
- Laura A. Bienvenu
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Baker Department of Cardiometabolic Health, University of Melbourne VIC, Melbourne, VIC, Australia
| | - James R. Bell
- Department of Microbiology, Anatomy, Physiology and Pharmacology, La Trobe University, Bundoora, VIC, Australia
- *Correspondence: James R. Bell,
| | - Kate L. Weeks
- Baker Department of Cardiometabolic Health, University of Melbourne VIC, Melbourne, VIC, Australia
- Department of Anatomy and Physiology, University of Melbourne, Parkville, VIC, Australia
| | - Lea M. D. Delbridge
- Department of Anatomy and Physiology, University of Melbourne, Parkville, VIC, Australia
| | - Morag J. Young
- Baker Department of Cardiometabolic Health, University of Melbourne VIC, Melbourne, VIC, Australia
- Cardiovascular Endocrinology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
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2
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Sharma P, Liu Chung Ming C, Wang X, Bienvenu LA, Beck D, Figtree GA, Boyle A, Gentile C. Biofabrication of advanced in vitro3D models to study ischaemic and doxorubicin-induced myocardial damage. Biofabrication 2022; 14. [PMID: 34983029 DOI: 10.1088/1758-5090/ac47d8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 01/04/2022] [Indexed: 11/11/2022]
Abstract
Current preclinicalin vitroandin vivomodels of cardiac injury typical of myocardial infarction (MI, or heart attack) and drug induced cardiotoxicity mimic only a few aspects of these complex scenarios. This leads to a poor translation of findings from the bench to the bedside. In this study, we biofabricated for the first time advancedin vitromodels of MI and doxorubicin (DOX) induced injury by exposing cardiac spheroids (CSs) to pathophysiological changes in oxygen (O2) levels or DOX treatment. Then, contractile function and cell death was analyzed in CSs in control versus I/R and DOX CSs. For a deeper dig into cell death analysis, 3D rendering analyses and mRNA level changes of cardiac damage-related genes were compared in control versus I/R and DOX CSs. Overall,in vitroCSs recapitulated major features typical of thein vivoMI and drug induced cardiac damages, such as adapting intracellular alterations to O2concentration changes and incubation with cardiotoxic drug, mimicking the contraction frequency and fractional shortening and changes in mRNA expression levels for genes regulating sarcomere structure, calcium transport, cell cycle, cardiac remodelling and signal transduction. Taken together, our study supports the use of I/R and DOX CSs as advancedin vitromodels to study MI and DOX-induced cardiac damage by recapitulating their complex in vivoscenario.
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Affiliation(s)
- Poonam Sharma
- The University of Newcastle Faculty of Health and Medicine, Kookaburra Cct, New Lambton Heights, New South Wales, 2305, AUSTRALIA
| | - Clara Liu Chung Ming
- University of Technology Sydney Faculty of Engineering, Building 11, Level 10, Room 115, University of Technology Sydney, Ultimo, Sydney, Ultimo, Sydney, New South Wales, 2007, AUSTRALIA
| | - Xiaowei Wang
- Baker Heart and Diabetes Institute South Australia, 75 Commercial Road, Melbourne, Victoria, 3004, AUSTRALIA
| | - Laura A Bienvenu
- Baker Heart and Diabetes Institute South Australia, 75 Commercial Road, Melbourne, Victoria, 3004, AUSTRALIA
| | - Domink Beck
- University of Technology Sydney Faculty of Engineering, Building 11, Level 10, Room 115, University of Technology Sydney, Ultimo, Sydney, Ultimo, Sydney, New South Wales, 2007, AUSTRALIA
| | - Gemma A Figtree
- , The University of Sydney Faculty of Medicine and Health, Reserve Rd, Sydney, New South Wales, 2000, AUSTRALIA
| | - Andrew Boyle
- The University of Newcastle Faculty of Health and Medicine, Kookaburra Cct, New Lambton Heights, New South Wales, 2305, AUSTRALIA
| | - Carmine Gentile
- University of Technology Sydney Faculty of Engineering, Building 11, Level 10, Room 115, 81 Broadway St, Ultimo, Sydney, Ultimo, Sydney, New South Wales, 2007, AUSTRALIA
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Bienvenu LA, Noonan J, Wang X, Peter K. Higher mortality of COVID-19 in males: sex differences in immune response and cardiovascular comorbidities. Cardiovasc Res 2020; 116:2197-2206. [PMID: 33063089 PMCID: PMC7665363 DOI: 10.1093/cvr/cvaa284] [Citation(s) in RCA: 161] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/08/2020] [Accepted: 10/01/2020] [Indexed: 02/07/2023] Open
Abstract
The high mortality rate of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection is a critical concern of the coronavirus disease 2019 (COVID-19) pandemic. Strikingly, men account for the majority of COVID-19 deaths, with current figures ranging from 59% to 75% of total mortality. However, despite clear implications in relation to COVID-19 mortality, most research has not considered sex as a critical factor in data analysis. Here, we highlight fundamental biological differences that exist between males and females, and how these may make significant contributions to the male-biased COVID-19 mortality. We present preclinical evidence identifying the influence of biological sex on the expression and regulation of angiotensin-converting enzyme 2 (ACE2), which is the main receptor used by SARS-CoV-2 to enter cells. However, we note that there is a lack of reports showing that sexual dimorphism of ACE2 expression exists and is of functional relevance in humans. In contrast, there is strong evidence, especially in the context of viral infections, that sexual dimorphism plays a central role in the genetic and hormonal regulation of immune responses, both of the innate and the adaptive immune system. We review evidence supporting that ineffective anti-SARS-CoV-2 responses, coupled with a predisposition for inappropriate hyperinflammatory responses, could provide a biological explanation for the male bias in COVID-19 mortality. A prominent finding in COVID-19 is the increased risk of death with pre-existing cardiovascular comorbidities, such as hypertension, obesity, and age. We contextualize how important features of sexual dimorphism and inflammation in COVID-19 may exhibit a reciprocal relationship with comorbidities, and explain their increased mortality risk. Ultimately, we demonstrate that biological sex is a fundamental variable of critical relevance to our mechanistic understanding of SARS-CoV-2 infection and the pursuit of effective COVID-19 preventative and therapeutic strategies.
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Affiliation(s)
- Laura A Bienvenu
- Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, 75 Commercial Rd, Melbourne, VIC 3004, Australia
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Department of Cardiometabolic Health, University of Melbourne, VIC, Australia
| | - Jonathan Noonan
- Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, 75 Commercial Rd, Melbourne, VIC 3004, Australia
- Department of Cardiometabolic Health, University of Melbourne, VIC, Australia
- Deparment of Immunology, Monash University, Melbourne, VIC, Australia
- Centre for Immunobiology, College of Medical, Veterinary and Life Sciences, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Xiaowei Wang
- Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, 75 Commercial Rd, Melbourne, VIC 3004, Australia
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Department of Cardiometabolic Health, University of Melbourne, VIC, Australia
- Department of Medicine, Monash University, Melbourne, VIC, Australia
| | - Karlheinz Peter
- Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, 75 Commercial Rd, Melbourne, VIC 3004, Australia
- Department of Cardiometabolic Health, University of Melbourne, VIC, Australia
- Deparment of Immunology, Monash University, Melbourne, VIC, Australia
- Department of Medicine, Monash University, Melbourne, VIC, Australia
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4
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Bienvenu LA, Maluenda A, McFadyen JD, Searle AK, Yu E, Haller C, Chaikof EL, Peter K, Wang X. Combined Antiplatelet/Anticoagulant Drug for Cardiac Ischemia/Reperfusion Injury. Circ Res 2020; 127:1211-1213. [PMID: 32806996 DOI: 10.1161/circresaha.120.317450] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Laura A Bienvenu
- Atherothrombosis and Vascular Biology Laboratory (L.A.B., A.M., J.D.M., A.K.S., E.Y., K.P.).,Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia (L.A.B., A.M., A.K.S., E.Y., X.W.).,Cardiometabolic Health, University of Melbourne, VIC, Australia (L.A.B., J.D.M., K.P., X.W.)
| | - Ana Maluenda
- Atherothrombosis and Vascular Biology Laboratory (L.A.B., A.M., J.D.M., A.K.S., E.Y., K.P.).,Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia (L.A.B., A.M., A.K.S., E.Y., X.W.)
| | - James D McFadyen
- Atherothrombosis and Vascular Biology Laboratory (L.A.B., A.M., J.D.M., A.K.S., E.Y., K.P.).,Cardiometabolic Health, University of Melbourne, VIC, Australia (L.A.B., J.D.M., K.P., X.W.).,Medicine, Monash University, Melbourne, VIC, Australia (J.D.M., A.K.S., E.Y., K.P., X.W.)
| | - Amy K Searle
- Atherothrombosis and Vascular Biology Laboratory (L.A.B., A.M., J.D.M., A.K.S., E.Y., K.P.).,Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia (L.A.B., A.M., A.K.S., E.Y., X.W.).,Cardiometabolic Health, University of Melbourne, VIC, Australia (L.A.B., J.D.M., K.P., X.W.)
| | - Eefang Yu
- Atherothrombosis and Vascular Biology Laboratory (L.A.B., A.M., J.D.M., A.K.S., E.Y., K.P.).,Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia (L.A.B., A.M., A.K.S., E.Y., X.W.).,Medicine, Monash University, Melbourne, VIC, Australia (J.D.M., A.K.S., E.Y., K.P., X.W.)
| | - Carolyn Haller
- Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA (C.H., E.L.C.).,Wyss Institute of Biologically Inspired Engineering of Harvard University, Boston, MA (C.H., E.L.C.)
| | - Elliot L Chaikof
- Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA (C.H., E.L.C.).,Wyss Institute of Biologically Inspired Engineering of Harvard University, Boston, MA (C.H., E.L.C.)
| | - Karlheinz Peter
- Atherothrombosis and Vascular Biology Laboratory (L.A.B., A.M., J.D.M., A.K.S., E.Y., K.P.).,Cardiometabolic Health, University of Melbourne, VIC, Australia (L.A.B., J.D.M., K.P., X.W.).,Medicine, Monash University, Melbourne, VIC, Australia (J.D.M., A.K.S., E.Y., K.P., X.W.)
| | - Xiaowei Wang
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia (L.A.B., A.M., A.K.S., E.Y., X.W.).,Cardiometabolic Health, University of Melbourne, VIC, Australia (L.A.B., J.D.M., K.P., X.W.).,Medicine, Monash University, Melbourne, VIC, Australia (J.D.M., A.K.S., E.Y., K.P., X.W.)
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5
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Bienvenu LA, Wang X, Peter K. Prime time viewing of the ischaemic heart: new technologies allow imaging and flow assessment of the microvasculature in the beating heart. Cardiovasc Res 2019; 115:1817-1819. [PMID: 31270528 DOI: 10.1093/cvr/cvz168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Laura A Bienvenu
- Atherothrombosis and Vascular Biology Program, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Xiaowei Wang
- Atherothrombosis and Vascular Biology Program, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Karlheinz Peter
- Atherothrombosis and Vascular Biology Program, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
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Affiliation(s)
- Lea M D Delbridge
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia; Department of Physiology, University of Auckland, Auckland, New Zealand.
| | - Laura A Bienvenu
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
| | - Kimberley M Mellor
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia; Department of Physiology, University of Auckland, Auckland, New Zealand; Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
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7
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Chandramouli C, Reichelt ME, Curl CL, Varma U, Bienvenu LA, Koutsifeli P, Raaijmakers AJA, De Blasio MJ, Qin CX, Jenkins AJ, Ritchie RH, Mellor KM, Delbridge LMD. Diastolic dysfunction is more apparent in STZ-induced diabetic female mice, despite less pronounced hyperglycemia. Sci Rep 2018; 8:2346. [PMID: 29402990 PMCID: PMC5799292 DOI: 10.1038/s41598-018-20703-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 01/23/2018] [Indexed: 12/17/2022] Open
Abstract
Diabetic cardiomyopathy is a distinct pathology characterized by early emergence of diastolic dysfunction. Increased cardiovascular risk associated with diabetes is more marked for women, but an understanding of the role of diastolic dysfunction in female susceptibility to diabetic cardiomyopathy is lacking. To investigate the sex-specific relationship between systemic diabetic status and in vivo occurrence of diastolic dysfunction, diabetes was induced in male and female mice by streptozotocin (5x daily i.p. 55 mg/kg). Echocardiography was performed at 7 weeks post-diabetes induction, cardiac collagen content assessed by picrosirius red staining, and gene expression measured using qPCR. The extent of diabetes-associated hyperglycemia was more marked in males than females (males: 25.8 ± 1.2 vs 9.1 ± 0.4 mM; females: 13.5 ± 1.5 vs 8.4 ± 0.4 mM, p < 0.05) yet in vivo diastolic dysfunction was evident in female (E/E' 54% increase, p < 0.05) but not male diabetic mice. Cardiac structural abnormalities (left ventricular wall thinning, collagen deposition) were similar in male and female diabetic mice. Female-specific gene expression changes in glucose metabolic and autophagy-related genes were evident. This study demonstrates that STZ-induced diabetic female mice exhibit a heightened susceptibility to diastolic dysfunction, despite exhibiting a lower extent of hyperglycemia than male mice. These findings highlight the importance of early echocardiographic screening of asymptomatic prediabetic at-risk patients.
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Affiliation(s)
- Chanchal Chandramouli
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
- National Heart Centre, Singapore, Singapore
| | - Melissa E Reichelt
- School of Biomedical Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Claire L Curl
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
| | - Upasna Varma
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
| | - Laura A Bienvenu
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
| | - Parisa Koutsifeli
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
- Department of Physiology, University of Auckland, Auckland, New Zealand
| | | | - Miles J De Blasio
- Heart Failure Pharmacology, Baker Heart & Diabetes Institute, Melbourne, Victoria, Australia
- School of Biosciences, University of Melbourne, Melbourne, Victoria, Australia
| | - Cheng Xue Qin
- Heart Failure Pharmacology, Baker Heart & Diabetes Institute, Melbourne, Victoria, Australia
- Department of Pharmacology and Therapeutics, University of Melbourne, Melbourne, Victoria, Australia
| | - Alicia J Jenkins
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, New South Wales, Australia
| | - Rebecca H Ritchie
- Heart Failure Pharmacology, Baker Heart & Diabetes Institute, Melbourne, Victoria, Australia
- Department of Pharmacology and Therapeutics, University of Melbourne, Melbourne, Victoria, Australia
| | - Kimberley M Mellor
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
- Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Lea M D Delbridge
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia.
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8
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Bienvenu LA, Morgan J, Reichelt ME, Delbridge LM, Young MJ. Chronic in vivo nitric oxide deficiency impairs cardiac functional recovery after ischemia in female (but not male) mice. J Mol Cell Cardiol 2017; 112:8-15. [DOI: 10.1016/j.yjmcc.2017.08.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 08/24/2017] [Accepted: 08/26/2017] [Indexed: 12/29/2022]
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9
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Fletcher EK, Morgan J, Kennaway DR, Bienvenu LA, Rickard AJ, Delbridge LMD, Fuller PJ, Clyne CD, Young MJ. Deoxycorticosterone/Salt-Mediated Cardiac Inflammation and Fibrosis Are Dependent on Functional CLOCK Signaling in Male Mice. Endocrinology 2017; 158:2906-2917. [PMID: 28911177 DOI: 10.1210/en.2016-1911] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 07/13/2017] [Indexed: 12/19/2022]
Abstract
Activation of the mineralocorticoid receptor (MR) promotes inflammation, fibrosis, and hypertension. Clinical and experimental studies show that MR antagonists have significant therapeutic benefit for all-cause heart failure; however, blockade of renal MRs limits their widespread use. Identification of key downstream signaling mechanisms for the MR in the cardiovascular system may enable development of targeted MR antagonists with selectivity for pathological MR signaling and lower impact on physiological renal electrolyte handling. One candidate pathway is the circadian clock, the dysregulation of which is associated with cardiovascular diseases. We have previously shown that the circadian gene Per2 is dysregulated in hearts with selective deletion of cardiomyocyte MR. We therefore investigated MR-mediated cardiac inflammation and fibrosis in mice that lack normal regulation and oscillation of the circadian clock in peripheral tissues, that is, CLOCKΔ19 mutant mice. The characteristic cardiac inflammatory/fibrotic response to a deoxycorticosterone (DOC)/salt for 8 weeks was significantly blunted in CLOCKΔ19 mice when compared with wild-type mice, despite a modest increase at "baseline" for fibrosis and macrophage number in CLOCKΔ19 mice. In contrast, cardiac hypertrophy in response to DOC/salt was significantly greater in CLOCKΔ19 vs wild-type mice. Markers for renal inflammation and fibrosis were similarly attenuated in the CLOCKΔ19 mice given DOC/salt. Moreover, increased CLOCK expression in H9c2 cardiac cells enhanced MR-mediated transactivation of Per1, suggesting cooperative signaling between these transcription factors. This study demonstrates that the full development of MR-mediated cardiac inflammation and fibrosis is dependent on intact signaling by the circadian protein CLOCK.
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Affiliation(s)
- Elizabeth K Fletcher
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
- Department of Physiology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - James Morgan
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
| | - David R Kennaway
- School of Medicine, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Laura A Bienvenu
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
- Department of Physiology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Amanda J Rickard
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
| | - Lea M D Delbridge
- Department of Physiology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Peter J Fuller
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
- Department of Medicine, Monash University, Clayton, Victoria 3168, Australia
| | - Colin D Clyne
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
| | - Morag J Young
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, Victoria 3168, Australia
- Department of Medicine, Monash University, Clayton, Victoria 3168, Australia
- Department of Physiology, Monash University, Clayton, Victoria 3168, Australia
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Ip WTK, McAlindon A, Miller SE, Bell JR, Curl CL, Huggins CE, Mellor KM, Raaijmakers AJA, Bienvenu LA, McLennan PL, Pepe S, Delbridge LMD. Dietary omega-6 fatty acid replacement selectively impairs cardiac functional recovery after ischemia in female (but not male) rats. Am J Physiol Heart Circ Physiol 2016; 311:H768-80. [PMID: 27422989 DOI: 10.1152/ajpheart.00690.2015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 07/12/2016] [Indexed: 02/05/2023]
Abstract
A definitive understanding of the role of dietary lipids in determining cardioprotection (or cardiodetriment) has been elusive. Randomized trial findings have been variable and sex specificity of dietary interventions has not been determined. In this investigation the sex-selective cardiac functional effects of three diets enriched by omega-3 or omega-6 polyunsaturated fatty acids (PUFA) or enriched to an equivalent extent in saturated fatty acid components were examined in rats after an 8-wk treatment period. In females the myocardial membrane omega-6:omega-3 PUFA ratio was twofold higher than males in the omega-6 diet replacement group. In diets specified to be high in omega-3 PUFA or in saturated fat, this sex difference was not apparent. Isolated cardiomyocyte and heart Langendorff perfusion experiments were performed, and molecular measures of cell viability were assessed. Under basal conditions the contractile performance of omega-6 fed female cardiomyocytes and hearts was reduced compared with males. Omega-6 fed females exhibited impaired systolic resilience after ischemic insult. This response was associated with increased postischemia necrotic cell damage evaluated by coronary lactate dehydrogenase during reperfusion in omega-6 fed females. Cardiac and myocyte functional parameters were not different between omega-3 and saturated fat dietary groups and within these groups there were no discernible sex differences. Our data provide evidence at both the cardiac and cardiomyocyte levels that dietary saturated fatty acid intake replacement with an omega-6 (but not omega-3) enriched diet has selective adverse cardiac effect in females. This finding has potential relevance in relation to women, cardiac risk, and dietary management.
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Affiliation(s)
- Wendy T K Ip
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Andrew McAlindon
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Sarah E Miller
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - James R Bell
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Claire L Curl
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Catherine E Huggins
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Kimberley M Mellor
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Antonia J A Raaijmakers
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Laura A Bienvenu
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia
| | - Peter L McLennan
- Graduate School of Medicine, Centre for Human Applied Physiology, University of Wollongong, Wollongong, Australia; and
| | - Salvatore Pepe
- Murdoch Children's Research Institute, Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - Lea M D Delbridge
- Cardiac Phenomics Laboratory, Department of Physiology, University of Melbourne, Parkville, Australia;
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Bienvenu LA, Reichelt ME, Morgan J, Fletcher EK, Bell JR, Rickard AJ, Delbridge LM, Young MJ. Cardiomyocyte Mineralocorticoid Receptor Activation Impairs Acute Cardiac Functional Recovery After Ischemic Insult. Hypertension 2015; 66:970-7. [PMID: 26351032 DOI: 10.1161/hypertensionaha.115.05981] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Accepted: 08/11/2015] [Indexed: 01/03/2023]
Abstract
Loss of mineralocorticoid receptor signaling selectively in cardiomyocytes can ameliorate cardiac fibrotic and inflammatory responses caused by excess mineralocorticoids. The aim of this study was to characterize the role of cardiomyocyte mineralocorticoid receptor signaling in ischemia-reperfusion injury and recovery and to identify a role of mineralocorticoid receptor modulation of cardiac function. Wild-type and cardiomyocyte mineralocorticoid receptor knockout mice (8 weeks) were uninephrectomized and maintained on (1) high salt (0.9% NaCl, 0.4% KCl) or (2) high salt plus deoxycorticosterone pellet (0.3 mg/d, 0.9% NaCl, 0.4% KCl). After 8 weeks of treatment, hearts were isolated and subjected to 20 minutes of global ischemia plus 45 minutes of reperfusion. Mineralocorticoid excess increased peak contracture during ischemia regardless of genotype. Recovery of left ventricular developed pressure and rates of contraction and relaxation post ischemia-reperfusion were greater in knockout versus wild-type hearts. The incidence of arrhythmic activity during early reperfusion was significantly higher in wild-type than in knockout hearts. Levels of autophosphorylated Ca(2+)/calmodulin protein kinase II (Thr287) were elevated in hearts from wild-type versus knockout mice and associated with increased sodium hydrogen exchanger-1 expression. These findings demonstrate that cardiomyocyte-specific mineralocorticoid receptor-dependent signaling contributes to electromechanical vulnerability in acute ischemia-reperfusion via a mechanism involving Ca(2+)/calmodulin protein kinase II activation in association with upstream alteration in expression regulation of the sodium hydrogen exchanger-1.
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Affiliation(s)
- Laura A Bienvenu
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - Melissa E Reichelt
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - James Morgan
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - Elizabeth K Fletcher
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - James R Bell
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - Amanda J Rickard
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - Lea M Delbridge
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.)
| | - Morag J Young
- From the Department of Cardiovascular Endocrinology, Hudson Institute of Medical Research, Clayton, Australia (L.A.B., J.M., E.K.F., A.J.R., M.J.Y.); and Department of Physiology, Melbourne University, Parkville, Australia (L.A.B., M.E.R., J.R.B., L.M.D.).
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Bienvenu LA, Reichelt ME, Morgan J, Delbridge LM, Young MJ. O128 Cardiomyocyte mineralocorticoid receptor signalling contributes to sex specific ischemic injury responses and reduces functional recovery post-ischemia/reperfusion. Glob Heart 2014. [DOI: 10.1016/j.gheart.2014.03.1338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Rickard AJ, Morgan J, Bienvenu LA, Fletcher EK, Cranston GA, Shen JZ, Reichelt ME, Delbridge LM, Young MJ. Cardiomyocyte mineralocorticoid receptors are essential for deoxycorticosterone/salt-mediated inflammation and cardiac fibrosis. Hypertension 2012; 60:1443-50. [PMID: 23108646 DOI: 10.1161/hypertensionaha.112.203158] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Because the role of mineralocorticoid receptors in specific cell types in cardiac remodeling remains unknown, we have compared cardiac responses with deoxycorticosterone/salt in cardiomyocyte mineralocorticoid receptor-null (MyoMRKO) and wild-type (WT) mice at 8 days and 8 weeks. No differences in cardiac function between untreated WT and MyoMRKO mice were found, whereas profibrotic markers were reduced in MyoMRKO hearts at baseline. At 8 days, MyoMRKO showed monocyte/macrophage recruitment equivalent to WT mice in response to deoxycorticosterone/salt but a suppression of markers of fibrosis compared with WT. At 8 weeks, MyoMRKO mice showed no deoxycorticosterone/salt-induced increase in inflammatory cell infiltration and collagen deposition or in proinflammatory gene expression. Although some profibrotic markers were equivalently increased in both genotypes, MyoMRKO mice also showed increased baseline levels of mRNA and protein for the transforming growth factor-β/connective tissue growth factor inhibitor decorin compared with WT that was accompanied by higher levels of matrix metalloproteinase 2/matrix metalloproteinase 9 activity. These data point to a direct role for cardiomyocyte mineralocorticoid receptor in both deoxycorticosterone/salt-induced tissue inflammation and remodeling and suggest potential mechanisms for the cardioprotective effects of selective mineralocorticoid receptor blockade in cardiomyocytes that may involve regulation of matrix metalloproteinase 2/matrix metalloproteinase 9 activity and the transforming growth factor-β-connective tissue growth factor profibrotic pathway.
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Affiliation(s)
- Amanda J Rickard
- Prince Henry’s Institute of Medical Research, Clayton, Victoria, Australia
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Bienvenu LA, Morgan J, Rickard AJ, Tesch GH, Cranston GA, Fletcher EK, Delbridge LMD, Young MJ. Macrophage mineralocorticoid receptor signaling plays a key role in aldosterone-independent cardiac fibrosis. Endocrinology 2012; 153:3416-25. [PMID: 22653557 DOI: 10.1210/en.2011-2098] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Mineralocorticoid receptor (MR) activation promotes the development of cardiac fibrosis and heart failure. Clinical evidence demonstrates that MR antagonism is protective even when plasma aldosterone levels are not increased. We hypothesize that MR activation in macrophages drives the profibrotic phenotype in the heart even when aldosterone levels are not elevated. The aim of the present study was to establish the role of macrophage MR signaling in mediating cardiac tissue remodeling caused by nitric oxide (NO) deficiency, a mineralocorticoid-independent insult. Male wild-type (MRflox/flox) and macrophage MR-knockout (MRflox/flox/LysMCre/+; mac-MRKO) mice were uninephrectomized, maintained on 0.9% NaCl drinking solution, with either vehicle (control) or the nitric oxide synthase (NOS) inhibitor NG-nitro-l-arginine methyl ester (L-NAME; 150 mg/kg/d) for 8 wk. NO deficiency increased systolic blood pressure at 4 wk in wild-type L-NAME/salt-treated mice compared with all other groups. At 8 wk, systolic blood pressure was increased above control in both L-NAME/salt treated wild-type and mac-MRKO mice by approximately 28 mm Hg by L-NAME/salt. Recruitment of macrophages was increased 2- to 3-fold in both L-NAME/salt treated wild-type and mac-MRKO. Inducible NOS positive macrophage infiltration and TNFα mRNA expression was greater in wild-type L-NAME/salt-treated mice compared with mac-MRKO, demonstrating that loss of MR reduces M1 phenotype. mRNA levels for markers of vascular inflammation and oxidative stress (NADPH oxidase 2, p22phox, intercellular adhesion molecule-1, G protein-coupled chemokine receptor 5) were similar in treated wild-type and mac-MRKO mice compared with control groups. In contrast, L-NAME/salt treatment increased interstitial collagen deposition in wild-type by about 33% but not in mac-MRKO mice. mRNA levels for connective tissue growth factor and collagen III were also increased above control treatment in wild-type (1.931 ± 0.215 vs. 1 ± 0.073) but not mac-MRKO mice (1.403 ± 0.150 vs. 1.286 ± 0.255). These data demonstrate that macrophage MR are necessary for the translation of inflammation and oxidative stress into interstitial and perivascular fibrosis after NO deficiency, even when plasma aldosterone is not elevated.
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