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Role of β-Adrenergic Receptors and Estrogen in Cardiac Repair after Myocardial Infarction: An Overview. Int J Mol Sci 2021; 22:ijms22168957. [PMID: 34445662 PMCID: PMC8396463 DOI: 10.3390/ijms22168957] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 12/30/2022] Open
Abstract
Acute myocardial infarction (MI) is associated with an intense inflammatory response that is critical for cardiac repair but is also involved in the pathogenesis of adverse cardiac remodeling, i.e., the set of size, geometry, and structure changes that represent the structural substrate for the development of post-MI heart failure. Deciphering the pathophysiological mechanisms underlying cardiac repair after MI is, therefore, critical to favorably regulate cardiac wound repair and to prevent development of heart failure. Catecholamines and estrogen play an active role in regulating the inflammatory response in the infarcted area. For example, stress-induced catecholamines alter recruitment and trafficking of leukocytes to the heart. Additionally, estrogen affects rate of cardiac rupture during the acute phase of MI, as well as infarct size and survival in animal models of MI. In this review, we will summarize the role of β-adrenergic receptors and estrogen in cardiac repair after infarction in preclinical studies.
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Zhang L, Li C, Yang L, Adzika GK, Machuki JO, Shi M, Sun Q, Sun H. Estrogen Protects Vasomotor Functions in Rats During Catecholamine Stress. Front Cardiovasc Med 2021; 8:679240. [PMID: 34222374 PMCID: PMC8241912 DOI: 10.3389/fcvm.2021.679240] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/26/2021] [Indexed: 12/17/2022] Open
Abstract
The incidence of dysfunctional vasomotor diseases has mostly occurred in postmenopausal women but not in premenopausal women. Hence, this study sought to investigate the impact of estrogen deficiency during catecholamine stress on vasomotor function. Also, attempts were made to utilize estrogen replacement therapy to mitigate the adverse effects (pathological remodeling) of stress on the aortic vessels to preserve vasomotor functions. To do this, female Sprague-Dawley (SD) rats were ovariectomized (OVX) along with sham operations (Sham). Day 14 after OVX operation, 17-estradiol (E2) was subcutaneously implanted (OVX+E2). Day 35 after operation, stress was induced by isoproterenol (ISO) subcutaneous injections. Clinically relevant blood pressure indexes (systolic, diastolic, and mean atrial blood pressures) were assessed in the rats. Aortic vascular ring tensions were assessed in vitro to ascertain the impact of E2 on their vasomotor function. Aortic vascular rings (AVRs) from OVX+ISO exhibited a significant increase in contractility in response to phenylephrine than AVRs isolated from Sham+ISO rats. Also, sera levels of nitric oxide (NO) and endothelin-1 (ET-1) and the expression of p-eNOS/eNOS from vascular tissues were ascertained. We demonstrate that, during stress, E2 prevented excessive weight gain and OVX rats had higher blood pressures than those in the Sham group. Further, we showed that E2 decreases ET-1 expressions during stress while upregulating NO expressions via enhancing eNOS activities to facilitate vasomotor functions. Finally, histological assessment revealed the E2 treatments during stress preserved vasomotor functions by preventing excessive intima-media thickening and collagen depositions in the aortic vascular walls.
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Affiliation(s)
- Lin Zhang
- Department of Physiology, Xuzhou Medical University, Xuzhou, China.,Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, China
| | - Chenfei Li
- Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | - Liting Yang
- Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | | | | | - Mingjin Shi
- Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | - Qi Sun
- Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | - Hong Sun
- Department of Physiology, Xuzhou Medical University, Xuzhou, China
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Machuki JO, Zhang HY, Geng J, Fu L, Adzika GK, Wu L, Shang W, Wu J, Kexue L, Zhao Z, Sun H. Estrogen regulation of cardiac cAMP-L-type Ca 2+ channel pathway modulates sex differences in basal contraction and responses to β 2AR-mediated stress in left ventricular apical myocytes. Cell Commun Signal 2019; 17:34. [PMID: 30987657 PMCID: PMC6466778 DOI: 10.1186/s12964-019-0346-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 03/27/2019] [Indexed: 12/16/2022] Open
Abstract
Backgrounds/Aim Male and female hearts have many structural and functional differences. Here, we investigated the role of estrogen (E2) in the mechanisms of sex differences in contraction through the cAMP-L-type Ca2+channel pathway in adult mice left ventricular (LV) apical myocytes at basal and stress state. Methods Isolated LV apical myocytes from male, female (Sham) and ovariectomised mice (OVX) were used to investigate contractility, Ca2+ transients and L-type Ca2+ channel (LTCC) function. The levels of β2AR, intracellular cAMP, phosphodiesterase (PDE 3 and PDE 4), RyR2, PLB, SLN, and SERCA2a were compared among the experimental groups. Results We found that (1) intracellular cAMP, ICaL density, contraction and Ca2+ transient amplitudes were larger in Sham and OVX + E2 myocytes compared to male and OVX. (2) The mRNA expression of PDE 3 and 4 were lower in Sham and OVX + E2 groups compared with male and OVX groups. Treatment of myocytes with IBMX (100 μM) increased contraction and Ca2+ transient amplitude in both sexes and canceled differences between them. (3) β2AR-mediated stress decreased cAMP concentration and peak contraction and Ca2+ transient amplitude only in male and OVX groups but not in Sham or OVX + E2 groups suggesting a cardioprotective role of E2 in female mice. (4) Pretreatment of OVX myocytes with GPR30 antagonist G15 (100 nM) abolished the effects of E2, but ERα and ERβ antagonist ICI 182,780 (1 μM) did not. Moreover, activation of GPR30 with G1 (100 nM) replicated the effects of E2 on cAMP, contraction and Ca2+ transient amplitudes suggesting that the acute effects of E2 were mediated by GPR30 via non-genomic signaling. (5) mRNA expression of RyR2 was higher in myocytes from Sham than those of male while PLB and SLN were higher in male than Sham but no sex differences were observed in the mRNA of SERCA2a. Conclusion Collectively, these results demonstrate that E2 modulates the expression of genes related to the cAMP-LTCC pathway and contributes to sex differences in cardiac contraction and responses to stress. We also show that estrogen confers cardioprotection against cardiac stress by non-genomic acute signaling via GPR30.
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Affiliation(s)
| | - Hong-Yuan Zhang
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.,Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, 221002, China
| | - Juan Geng
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.,Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, 221002, China
| | - Lu Fu
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Gabriel Komla Adzika
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Lijuan Wu
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.,Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, 221002, China
| | - Wenkang Shang
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, 221002, China
| | - Jinxia Wu
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Li Kexue
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Zhiwei Zhao
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, 221002, China
| | - Hong Sun
- Physiology Department, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.
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Machuki J, Zhang H, Harding S, Sun H. Molecular pathways of oestrogen receptors and β-adrenergic receptors in cardiac cells: Recognition of their similarities, interactions and therapeutic value. Acta Physiol (Oxf) 2018; 222. [PMID: 28994249 PMCID: PMC5813217 DOI: 10.1111/apha.12978] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 09/07/2017] [Accepted: 10/02/2017] [Indexed: 12/18/2022]
Abstract
Oestrogen receptors (ERs) and β-adrenergic receptors (βARs) play important roles in the cardiovascular system. Moreover, these receptors are expressed in cardiac myocytes and vascular tissues. Numerous experimental observations support the hypothesis that similarities and interactions exist between the signalling pathways of ERs (ERα, ERβ and GPR30) and βARs (β1 AR, β2 AR and β3 AR). The recently discovered oestrogen receptor GPR30 shares structural features with the βARs, and this forms the basis for the interactions and functional overlap. GPR30 possesses protein kinase A (PKA) phosphorylation sites and PDZ binding motifs and interacts with A-kinase anchoring protein 5 (AKAP5), all of which enable its interaction with the βAR pathways. The interactions between ERs and βARs occur downstream of the G-protein-coupled receptor, through the Gαs and Gαi proteins. This review presents an up-to-date description of ERs and βARs and demonstrates functional synergism and interactions among these receptors in cardiac cells. We explore their signalling cascades and the mechanisms that orchestrate their interactions and propose new perspectives on the signalling patterns for the GPR30 based on its structural resemblance to the βARs. In addition, we explore the relevance of these interactions to cell physiology, drugs (especially β-blockers and calcium channel blockers) and cardioprotection. Furthermore, a receptor-independent mechanism for oestrogen and its influence on the expression of βARs and calcium-handling proteins are discussed. Finally, we highlight promising therapeutic avenues that can be derived from the shared pathways, especially the phosphatidylinositol-3-OH kinase (PI3K/Akt) pathway.
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Affiliation(s)
- J.O. Machuki
- Department of Physiology; Xuzhou Medical University; Xuzhou China
| | - H.Y. Zhang
- Department of Physiology; Xuzhou Medical University; Xuzhou China
| | - S.E. Harding
- National Heart and Lung Institute; Imperial College; London UK
| | - H. Sun
- Department of Physiology; Xuzhou Medical University; Xuzhou China
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Estrogen deficiency compromised the β 2AR-Gs/Gi coupling: implications for arrhythmia and cardiac injury. Pflugers Arch 2018; 470:559-570. [PMID: 29297096 DOI: 10.1007/s00424-017-2098-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 11/24/2017] [Accepted: 12/17/2017] [Indexed: 01/03/2023]
Abstract
Estrogen and β2-adrenergic receptors (β2AR) play important roles in the processes that protect the heart. Here, we investigated how ovariectomy influenced the β2AR downstream pathways in the context of catecholaminergic stress. In vivo and in vitro stress models were developed in female Sprague-Dawley (SD) rats by epinephrine (Epi) treatments. The cardiac function was evaluated at in vivo and in vitro levels in terms of contraction, rhythm, and injury. We found that myocardial contractility was not significantly different between Sham and ovariectomized (OVX) group rats in the normal state. However, Epi pretreatment decreased the contractility and increased abnormal rhythms especially in OVX group, which were attributed to lack of estrogen. Inhibition of the β2AR-Gi-PI3K/p38MAPK pathway with ICI118,551, PTX or LY294002 increased contractility and aggravated Epi-induced injury on cardiomyocytes, decreased p38MAPK phosphorylation, and only increased arrhythmia in Sham group. These results indicated that OVX exacerbated cardiac injury and abnormal rhythms through β2AR-Gi-PI3K and β2AR-Gi-p38MAPK pathways, respectively. In normal state, the levels of activated Gi were similar in both groups, but those of cAMP and activated Gs were higher in OVX group. Epi treatment increased activated Gi (especially in Sham group) and activated Gs and cAMP in Sham group but decreased it in OVX group. These results suggested that estrogen increased the Gi activity in normal and stress states and Gs activity in stress state. These results indicated that lack of estrogen impaired the β2AR-Gs/Gi coupling during stress which compromised cardiac contractility and increased abnormal rhythms.
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Goico A, Chandrasekaran M, Herrera CJ. Novel developments in stress cardiomyopathy: From pathophysiology to prognosis. Int J Cardiol 2016; 223:1053-1058. [DOI: 10.1016/j.ijcard.2016.08.241] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 08/09/2016] [Accepted: 08/12/2016] [Indexed: 12/20/2022]
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See Hoe LE, Schilling JM, Busija AR, Haushalter KJ, Ozberk V, Keshwani MM, Roth DM, Toit ED, Headrick JP, Patel HH, Peart JN. Chronic β1-adrenoceptor blockade impairs ischaemic tolerance and preconditioning in murine myocardium. Eur J Pharmacol 2016; 789:1-7. [PMID: 27373851 DOI: 10.1016/j.ejphar.2016.06.054] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 06/28/2016] [Accepted: 06/29/2016] [Indexed: 01/20/2023]
Abstract
β-adrenoceptor antagonists are commonly used in ischaemic heart disease (IHD) patients, yet may impair signalling and efficacy of 'cardioprotective' interventions. We assessed effects of chronic β1-adrenoceptor antagonism on myocardial resistance to ischaemia-reperfusion (IR) injury and the ability of cardioprotective interventions [classic ischaemic preconditioning (IPC); novel sustained ligand-activated preconditioning (SLP)] to reduce IR injury in murine hearts. Young male C57Bl/6 mice were untreated or received atenolol (0.5g/l in drinking water) for 4 weeks. Subsequently, two cardioprotective stimuli were evaluated: morphine pellets implanted (to induce SLP, controls received placebo) 5 days prior to Langendorff heart perfusion, and IPC in perfused hearts (3×1.5min ischaemia/2min reperfusion). Atenolol significantly reduced in vivo heart rate. Untreated control hearts exhibited substantial left ventricular dysfunction (~50% pressure development recovery, ~20mmHg diastolic pressure rise) with significant release of lactate dehydrogenase (LDH, tissue injury indicator) after 25min ischaemia/45min reperfusion. Contractile dysfunction and elevated LDH were reduced >50% with IPC and SLP. While atenolol treatment did not modify baseline contractile function, post-ischaemic function was significantly depressed compared to untreated hearts. Atenolol pre-treatment abolished beneficial effects of IPC, whereas SLP protection was preserved. These data indicate that chronic β1-adrenoceptor blockade can exert negative effects on functional IR tolerance and negate conventional IPC (implicating β1-adrenoceptors in IR injury and IPC signalling). However, novel morphine-induced SLP is resistant to inhibition by β1-adrenoceptor antagonism.
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Affiliation(s)
- Louise E See Hoe
- Menzies Health Institute Queensland, Griffith University, Southport, Australia
| | - Jan M Schilling
- VA San Diego Healthcare System, San Diego, USA; Department of Anesthesiology, University of California San Diego, USA
| | - Anna R Busija
- VA San Diego Healthcare System, San Diego, USA; Department of Anesthesiology, University of California San Diego, USA
| | - Kristofer J Haushalter
- VA San Diego Healthcare System, San Diego, USA; Department of Anesthesiology, University of California San Diego, USA; Department of Chemistry and Biochemistry, University of California San Diego, USA
| | - Victoria Ozberk
- Menzies Health Institute Queensland, Griffith University, Southport, Australia
| | - Malik M Keshwani
- Department of Pharmacology, University of California San Diego, USA
| | - David M Roth
- VA San Diego Healthcare System, San Diego, USA; Department of Anesthesiology, University of California San Diego, USA
| | - Eugene Du Toit
- Menzies Health Institute Queensland, Griffith University, Southport, Australia
| | - John P Headrick
- Menzies Health Institute Queensland, Griffith University, Southport, Australia
| | - Hemal H Patel
- VA San Diego Healthcare System, San Diego, USA; Department of Anesthesiology, University of California San Diego, USA
| | - Jason N Peart
- Menzies Health Institute Queensland, Griffith University, Southport, Australia.
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Zhang RQ, Li DY, Xu TD, Zhu SS, Pan HJ, Fang F, Wu X, Sun H. Antioxidative effect of luteolin pretreatment on simulated ischemia/reperfusion injury in cardiomyocyte and perfused rat heart. Chin J Integr Med 2016; 23:518-527. [PMID: 26956461 DOI: 10.1007/s11655-015-2296-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Indexed: 01/08/2023]
Abstract
OBJECTIVE To investigate the antioxidative effect and mechanism of luteolin on rat cardiomyocytes and isolated hearts followed by simulated ischemia/reperfusion (SI/R) injury. METHODS The left ventricular cardiomyocytes and the isolated hearts from adult rats were subjected to SI/R injury. The experiment groups included control, SI/R, luteolin + SI/R (Lut + SI/R), vitamin E (Vit E) + SI/R, and LY294002 + luteolin + SI/R (LY + Lut + SI/R) groups. Cell viability, shortening amplitude, lactate dehydrogenase (LDH) release, superoxide dismutase (SOD) activity, the production of reactive oxygen species (ROS) and malondialdehyde (MDA), expression levels of Akt, phosphorylated Akt, NOX2 (gp91phox), NOX2 mRNA, mitogen-activated protein kinase (p38 MAPK) and phosphorylated p38MAPK were all measured after 3-h simulated ischemia and 2-h simulated reperfusion procedure in cardiomyocytes. Vit E was used as a standard control. The contractile function of isolated hearts was further observed after they were subjected to 30-min global ischemia and 120-min reperfusion. RESULTS Pretreatment with 8-μmol/L luteolin substantially increased cell viability and shortening amplitude, while reducing evidence of oxidative stress-induced damage in the cells. In addition, the expression of NOX2, NOX2 mRNA and phosphorylation of p38MAPK were all downregulated. Furthermore, pretreatment with 40-μmol/L luteolin improved the recovery of myocardial contractile function following SI/R-induced injury, and luteolin markedly increased phosphorylation of Akt. However, all of the above effects were partially inhibited by the phosphatidylinositol 3-kinase (PI3K) inhibitor, LY294002. CONCLUSIONS Luteolin prevents SI/R-induced myocardial damage by reducing oxidative stress-induced injury in isolated rat hearts and cardiomyocytes, and the cardioprotection induced by luteolin was partially mediated by the PI3K/Akt pathway.
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Affiliation(s)
- Rui-Qu Zhang
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China
| | - Dong-Ye Li
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China.
| | - Tong-da Xu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China
| | - Sha-Sha Zhu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China
| | - Huan-Jun Pan
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China
| | - Fang Fang
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China
| | - Xin Wu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China
| | - Hong Sun
- Department of Physiology, Xuzhou Medical College, Xuzhou, Jiangsu Province, 221002, China.
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Cao X, Zhou C, Chong J, Fu L, Zhang L, Sun D, Hou H, Zhang Y, Li D, Sun H. Estrogen resisted stress-induced cardiomyopathy through increasing the activity of β2AR–Gαs signal pathway in female rats. Int J Cardiol 2015; 187:377-86. [DOI: 10.1016/j.ijcard.2015.02.113] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 02/16/2015] [Accepted: 02/21/2015] [Indexed: 02/08/2023]
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Bao L, Lu F, Chen H, Min Q, Chen X, Song Y, Zhao B, Bu H, Sun H. High concentration of epigallocatechin-3-gallate increased the incidences of arrhythmia and diastolic dysfunction via β2-adrenoceptor. J Food Sci 2015; 80:T659-63. [PMID: 25676191 DOI: 10.1111/1750-3841.12803] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 12/18/2014] [Indexed: 11/28/2022]
Abstract
Epigallocatechin-3-gallate (EGCG) is the major and most potent representative in green tea, which has been proved to modulate myocardial contractility. Whether EGCG has some negative effects on cardiac function is not known. In the present study, we investigated the effects of EGCG at different doses on cardiac contraction and explored whether β2 -adrenoceptor (β2 AR) was involved in EGCG-induced cardiac effects. Isolated rat hearts were mounted on the Langendorff system and perfused with different concentrations of EGCG in low or normal calcium Krebs-Henseleit (KH) buffer. The contraction of hearts was measured. Ventricular myocytes were cultured with EGCG and isoprenaline (ISO, 10(-7) M) for 12 h. ICI118,551 (55 nM) was used to inhibit β2 AR. Cardiomyocyte shortening, viability, and responsiveness to ISO (10(-9) M) were measured. EGCG dose dependently enhanced contractility of perfused heart in low calcium KH buffer. In the normal calcium KH buffer, EGCG at low dose (20 μM) increased heart contraction, while at high dose (50 μM), it increased the incidences of arrhythmia and diastolic dysfunction. In isolated ventricular myocytes, EGCG at the concentration of 0.001 to 1.0 μΜ did not affect their contraction. However, the responsiveness to ISO and the survival of myocytes were increased by EGCG (0.01 μM). The increased responsiveness was partially abolished by ICI118,551. The data obtained in this study demonstrated that EGCG at low dose conferred cardioprotection, yet at high dose increased the incidences of arrhythmia and diastolic dysfunction. β2 AR was involved in EGCG-induced cardiac effects.
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Affiliation(s)
- Lei Bao
- Dept. of Clinical Medicine, Xuzhou Medical College, Xuzhou, 221004, Jiangsu, China
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Sun Y, Wang Y, Zhang L, Xu C, Liu Y, Kang S, Yan C, Li D, Sun H. Prevention of cardiac events caused by surgical stress in aged rats: simultaneously activating β2-adrenoceptor and inhibiting β1-adrenoceptor. Stress 2014; 17:373-81. [PMID: 24754893 DOI: 10.3109/10253890.2014.915392] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Increased plasma catecholamine levels are associated with a high risk of perioperative cardiac events in aged individuals undergoing non-cardiac surgical interventions. Given the different effects of β1-adrenoreceptor (β1AR) and β2-adrenoreceptor (β2AR) stimulation by catecholamine in cardiomyocytes, this study evaluated whether simultaneous inhibition of β1AR and activation of β2AR is better than separate application in reducing the risk of perioperative cardiac events in aged rats undergoing non-cardiac surgery. Male aged Sprague-Dawley (SD) rats were divided into five groups. Normal group received no treatment. Surgery group received an abdominal surgery with hypoxia. β1- group, β2+ group, β2+ group and β1+β2+ group received surgery and hypoxia with metoprolol (100 mg/kg·d), fenoterol (250 μg/kg·d) or both, respectively. The drugs were given three days before surgery with treatment continued through post-surgical day 7. The results showed that simultaneous activation of β2AR with a β2AR agonist and inhibition of β1AR with a selective β1AR blocker normalized myocardial oxygen consumption, decreased myocardial damage, augmented cardiomyocyte survival, improved cardiac function, reduced the incidence of arrhythmia, thus decreasing the occurrence of cardiac events in perioperative aged rats undergoing non-cardiac surgery. The results demonstrated that combined use of β2AR agonist and β1AR blocker achieved better general effects than use of either one alone. Our results provide a new insight into preventing perioperative cardiac events for elderly patients undergoing surgical stress.
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Kang S, Liu Y, Sun D, Zhou C, Liu A, Xu C, Hao Y, Li D, Yan C, Sun H. Chronic activation of the G protein-coupled receptor 30 with agonist G-1 attenuates heart failure. PLoS One 2012; 7:e48185. [PMID: 23110207 PMCID: PMC3482180 DOI: 10.1371/journal.pone.0048185] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Accepted: 09/25/2012] [Indexed: 11/18/2022] Open
Abstract
G protein-coupled receptor (GPR) 30 is a novel estrogen receptor. Recent studies suggest that activation of the GPR30 confers rapid cardioprotection in isolated rat heart. It is unknown whether chronic activation of GPR30 is beneficial or not for heart failure. In this study we investigated the cardiac effect of sustained activation or inhibition of GPR30. Female Sprague–Dawley rats were divided into 7 groups #2Q1: sham surgery (Sham), bilateral ovariectomy (OVX), OVX+estrogen (E2), OVX+isoproterenol (ISO), OVX+ISO+G-1, OVX+ISO+E2+G15, OVX+ISO+E2. ISO (85 mg/kg×17 day, sc) was given to make the heart failure models. G-1(120 µg/kg·d×14 day) was used to activate GPR30 and G15 (190 µg/kg·d×14 day) was used to inhibit GPR30. Concentration of brain natriuretic peptide in serum, masson staining in isolated heart, contractile function and the expression of β1 and β2- adrenergic receptor (AR) of ventricular myocytes were also determined. Our data showed that ISO treatment led to heart failure in OVX rats. G-1 or E2 treatment decreased concentration of brain natriuretic peptide, reduced cardiac fibrosis, and enhanced contraction of the heart. Combined treatment with β1 (CGP20712A) and β2-AR (ICI118551) antagonist abolished the improvement of myocardial function induced by G-1. We also found that chronic treatment with G-1 normalized the expression of β1-AR and increased the expression of β2-AR. Our results indicate that chronic activation of the GPR30 with its agonist G-1 attenuates heart failure by normalizing the expression of β1-AR and increasing the expression of β2-AR.
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Affiliation(s)
- Shoulei Kang
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Ying Liu
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Di Sun
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Chunle Zhou
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Aiying Liu
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Chuanying Xu
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Yanling Hao
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Dongye Li
- Institute of Cardiovascular Disease Research, Xuzhou Medical College Affiliated Hospital, Xuzhou, 221002, China
- * E-mail: (DL); (HS)
| | - Changdong Yan
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
| | - Hong Sun
- Department of Physiology, Xuzhou Medical College, Xuzhou, 221002, China
- * E-mail: (DL); (HS)
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Jiang X, Xu C, Wang Y, Gao L, Yan C, Li D, Sun H. β2-adrenoceptor transfection enhances contractile reserve of isolated rat ventricular myocytes exposed to chronic isoprenaline stimulation by improving β1-adrenoceptor responsiveness. J Recept Signal Transduct Res 2012; 32:36-41. [PMID: 22216755 DOI: 10.3109/10799893.2011.610107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT Heart failure (HF) is a progressive deterioration in heart function associated with overactivity of the sympathetic nervous system. Elevated sympathetic nervous system activity down regulates the β-adrenergic signal system, suppressing β-adrenoceptors (β-ARs)-mediated contractile support in the failing heart. OBJECTIVE We investigated the effects of β(2)-AR gene transfer on shortening amplitude of isolated ventricular myocytes under chronic exposure to isoprenaline (ISO), and further determine the contributions of β(1)-AR and β(2)-AR to the contraction. MATERIALS AND METHODS Cardiomyocytes were isolated from adult rat hearts and then transfected with β(2)-AR gene using an adenovirus vector. Four hours after the infection, cardiomyocytes were treated with ISO for another 24 hours to imitate high levels of circulating catecholamines in HF. Western blotting was performed to measure myocardial protein expression of β(2)-AR. Video-based edge-detection system was used to evaluate basal and ISO-stimulated shortening amplitudes of cardiomyocytes. RESULTS β(2)-AR gene transfer increased β(2)-AR protein content. Chronic ISO stimulation produced a negative inotropic response, whereas acute ISO stimulation showed a positive inotropic response. β(2)-AR gene transfer had no significant effects on shortening amplitude of cardiomyocytes under normal conditions, but enhanced the blunted contraction of cardiomyocytes under pathological conditions induced by chronic ISO stimulation, and the effect was inhibited by β(1)-AR antagonist, CGP 20712A, instead of β(2)-AR antagonist, ICI 118,551. DISCUSSION AND CONCLUSIONS We conclude that β(2)-AR gene transfer in isolated ventricular myocytes under chronic ISO stimulation improves cellular contraction, and the beneficial effects might be mediated by improving β(1)-adrenoceptor responsiveness.
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Affiliation(s)
- XinWei Jiang
- Department of Physiology, Xuzhou Medical College, Xuzhou, China
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Liu A, Gao L, Kang S, Liu Y, Xu C, Sun H, Li D, Yan C. Testosterone enhances estradiol's cardioprotection in ovariectomized rats. J Endocrinol 2012; 212:61-9. [PMID: 21965546 DOI: 10.1530/joe-11-0181] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
After menopause, the development of cardiovascular disease (CVD) is due not only to estrogen decline but also to androgen decline. This study examined the effects of either estradiol (E(2)) or testosterone replacement alone or E(2)-testosterone combination on isolated myocytes in ovariectomized (Ovx) rats subjected to ischemia/reperfusion (I/R). Furthermore, we determined whether the effects are associated with β(2)-adrenoceptor (β(2)-AR). Five groups of adult female Sprague-Dawley rats were used: Sham operation (Sham) rats, bilateral Ovx rats, Ovx rats with E(2) 40 μg/kg per day (Ovx+E), Ovx rats with testosterone 150 μg/kg per day (Ovx+T), and Ovx rats with E(2) 40 μg/kg per day+testosterone 150 μg/kg per day (Ovx+E/T). We determined the lactate dehydrogenase (LDH) release, percentage of rod-shaped cells and apoptosis of ventricular myocytes from rats of all groups subjected to I/R. Then, we determined the above indices and contractile function with or without a selective β(2)-AR antagonist ICI 118 551. We also determined the expression of β(2)-AR. Our data show that either E(2) or testosterone replacement alone or E(2) and testosterone in combination decreased the LDH release, increased the percentage of rod-shaped cells, reduced apoptotic cells (%), and combination treatment appeared to be more effective than either E(2) or testosterone replacement alone. ICI 118 551 abolished the effects of the three. Combination supplementation also enhanced the expression of β(2)-AR. We concluded that in Ovx rats, testosterone enhances E(2)'s cardioprotection, while E(2) and testosterone in combination was more effective and the protective effects may be associated with β(2)-AR. The study highlights the potential therapeutic application for CVD in postmenopausal women.
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Affiliation(s)
- Aiying Liu
- Department of Physiology, Xuzhou Medical College, Xuzhou, Jiangsu 221002, China
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Salvianolic Acid A Demonstrates Cardioprotective Effects in Rat Hearts and Cardiomyocytes After Ischemia/Reperfusion Injury. J Cardiovasc Pharmacol 2011; 58:535-42. [DOI: 10.1097/fjc.0b013e31822de355] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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