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Xu T, Zhang Y, Liao G, Xuan H, Yin J, Bao J, Liu Y, Li D. Luteolin Pretreatment Ameliorates Myocardial Ischemia/Reperfusion Injury by lncRNA-JPX/miR-146b Axis. Anal Cell Pathol (Amst) 2023; 2023:4500810. [PMID: 38077523 PMCID: PMC10710365 DOI: 10.1155/2023/4500810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/03/2023] [Accepted: 11/13/2023] [Indexed: 12/18/2023] Open
Abstract
Background In the present study, we aimed to find out whether luteolin (Lut) pretreatment could ameliorate myocardial ischemia/reperfusion (I/R) injury by regulating the lncRNA just proximal to XIST (JPX)/microRNA-146b (miR-146b) axis. Methods We established the models in vitro (HL-1 cells) and in vivo (C57BL/6J mice) to certify the protection mechanism of Lut pretreatment on myocardial I/R injury. Dual luciferase reporter gene assay was utilized for validating that JPX could bind to miR-146b. JPX and miR-146b expression levels were determined by RT-qPCR. Western blot was utilized to examine apoptosis-related protein expression levels, including cleaved caspase-9, caspase-9, cleaved caspase-3, caspase-3, Bcl-2, Bax, and BAG-1. Apoptosis was analyzed by Annexin V-APC/7-AAD dualstaining, Hoechst 33342 staining, as well as flow cytometry. Animal echocardiography was used to measure cardiac function (ejection fraction (EF) and fractional shortening (FS) indicators). Results miR-146b was demonstrated to bind and recognize the JPX sequence site by dual luciferase reporter gene assay. The expression level of miR-146b was corroborated to be enhanced by H/R using RT-qPCR (P < 0.001 vs. Con). Moreover, JPX could reduce the expression of miR-146b, whereas inhibiting JPX could reverse the alteration (P < 0.001 vs. H/R, respectively). Western blot analysis demonstrated that Lut pretreatment increased BAG-1 expression level and Bcl-2/Bax ratio, but diminished the ratio of cleaved caspase 9/caspase 9 and cleaved caspase 3/caspase 3 (P < 0.001 vs. H/R, respectively). Moreover, the cell apoptosis change trend, measured by Annexin V-APC/7-AAD dualstaining, Hoechst 33342 staining, along with flow cytometry, was consistent with that of apoptosis-related proteins. Furthermore, pretreatment with Lut improved cardiac function (EF and FS) (P < 0.001 vs. I/R, respectively), as indicated in animal echocardiography. Conclusion Our results demonstrated that in vitro and in vivo, Lut pretreatment inhibited apoptosis via the JPX/miR-146b axis, ultimately improving myocardial I/R injury.
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Affiliation(s)
- Tongda Xu
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, China
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
| | - Yuanyuan Zhang
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, China
| | - Gege Liao
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, China
| | - Haochen Xuan
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
| | - Jie Yin
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
| | - Jieli Bao
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
| | - Yang Liu
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, China
| | - Dongye Li
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, Xuzhou, China
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
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Harada E, Mizuno Y, Ishii M, Ishida T, Yamada T, Kugimiya F, Yasue H. Beta-blockers are associated with increased B-type natriuretic peptide levels differently in men and women in heart failure with preserved ejection fraction. Am J Physiol Heart Circ Physiol 2022; 323:H276-H284. [PMID: 35714176 DOI: 10.1152/ajpheart.00029.2022] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Beta-blocker (BB) use is a mainstay for treatment of heart failure (HF) with reduced ejection fraction (HFrEF), whereas its efficacy for heart failure with preserved ejection fraction (HFpEF) remains controversial. Women outnumber men in HFpEF, whereas men outnumber women in HFrEF. Plasma B-type natriuretic peptide (BNP) is established as a biomarker for HF. We examined whether BB use is associated with plasma BNP levels differently in men and women with HFpEF. The study subjects comprised 721 patients with HFpEF (LVEF≥50%) (184 men, mean age 78.2±9.2 and 537 women, mean age 83.1±8.8), 179 on BB (66 men and 113 women) and 542 (118 men and 424 women) not, 583 in sinus rhythm (SR) and 138 in atrial fibrillation (AF). Multivariable logistic regression test was utilized. Plasma BNP levels were higher (P=0.0005), systolic blood pressure and LVEF lower (P=0.0003, and P=0.0059, respectively) on BBs than on no-BBs in women, whereas in men plasma BNP levels, systolic blood pressure, and LVEF were not altered significantly (P=0.0849, P=0.9129, and P=0.4718, respectively) on BBs compared to no-BBs in patients with SR. Multivariable logistic regression analysis revealed that BB use and women were a positive and a negative predictor for high BNP levels (P=0.003 and P=0.032, respectively) in SR but not in AF. BB use was associated with high plasma BNP levels and lower LVEF in women but not in men with HFpEF and SR, suggesting that the pathogenesis and of HFpEF may differ in men and women in SR.
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Affiliation(s)
- Eisaku Harada
- Division of Cardiovascular Medicine, Kumamoto Kinoh Hospital, Kumamoto Aging Research Institute, Kumamoto, Japan
| | - Yuji Mizuno
- Division of Cardiovascular Medicine, Kumamoto Kinoh Hospital, Kumamoto Aging Research Institute, Kumamoto, Japan
| | - Masanobu Ishii
- Department of Cardiovascular Medicine, Faculty of Life Science, Graduate School of Medical Sciences, Kumamoto University, Kumamoto City, Japan
| | - Toshifumi Ishida
- Division of Cardiovascular Medicine, Kumamoto Kinoh Hospital, Kumamoto Aging Research Institute, Kumamoto, Japan
| | - Toshihiro Yamada
- Division of Cardiovascular Medicine, Kumamoto Kinoh Hospital, Kumamoto Aging Research Institute, Kumamoto, Japan
| | - Fumihito Kugimiya
- Division of Cardiovascular Medicine, Kumamoto Kinoh Hospital, Kumamoto Aging Research Institute, Kumamoto, Japan
| | - Hirofumi Yasue
- Division of Cardiovascular Medicine, Kumamoto Kinoh Hospital, Kumamoto Aging Research Institute, Kumamoto, Japan
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3
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Chen J, Liu Y, Pan D, Xu T, Luo Y, Wu W, Wu P, Zhu H, Li D. Estrogen inhibits endoplasmic reticulum stress and ameliorates myocardial ischemia/reperfusion injury in rats by upregulating SERCA2a. Cell Commun Signal 2022; 20:38. [PMID: 35331264 PMCID: PMC8944077 DOI: 10.1186/s12964-022-00842-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 02/07/2022] [Indexed: 11/10/2022] Open
Abstract
Background The incidence of coronary heart disease (CHD) in premenopausal women is significantly lower than that of men of the same age, suggesting protective roles of estrogen for the cardiovascular system against CHD. This study aimed to confirm the protective effect of estrogen on myocardium during myocardial ischemia/reperfusion (MI/R) injury and explore the underlying mechanisms. Methods Neonatal rat cardiomyocytes and Sprague–Dawley rats were used in this study. Different groups were treated by bilateral ovariectomy, 17β-estradiol (E2), adenoviral infection, or siRNA transfection. The expression of sarcoplasmic reticulum Ca2+ ATPase pump (SERCA2a) and endoplasmic reticulum (ER) stress-related proteins were measured in each group to examine the effect of different E2 levels and determine the relationship between SERCA2a and ER stress. The cell apoptosis, myocardial infarction size, levels of apoptosis and serum cardiac troponin I, ejection fraction, calcium transient, and morphology changes of the myocardium and ER were examined to verify the effects of E2 on the myocardium. Results Bilateral ovariectomy resulted in reduced SERCA2a levels and more severe MI/R injury. E2 treatment increased SERCA2a expression. Both E2 treatment and exogenous SERCA2a overexpression decreased levels of ER stress-related proteins and alleviated myocardial damage. In contrast, SERCA2a knockdown exacerbated ER stress and myocardial damage. Addition of E2 after SERCA2a knockdown did not effectively inhibit ER stress or reduce myocardial injury. Conclusions Our data demonstrate that estrogen inhibits ER stress and attenuates MI/R injury by upregulating SERCA2a. These results provide a new potential target for therapeutic intervention and drug discovery in CHD. Video Abstract
Supplementary Information The online version contains supplementary material available at 10.1186/s12964-022-00842-2.
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Affiliation(s)
- Jingwen Chen
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China.,Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Yang Liu
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Defeng Pan
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Tongda Xu
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China.,Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Yuanyuan Luo
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Wanling Wu
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Pei Wu
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China
| | - Hong Zhu
- Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China.
| | - Dongye Li
- Institute of Cardiovascular Disease Research, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China. .,Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou, 221002, Jiangsu, People's Republic of China.
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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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Abstract
PURPOSE OF THE REVIEW This review summarizes sex-related changes in the heart and vasculature that occur with aging, both in the presence and absence of cardiovascular disease (CVD). RECENT FINDINGS In the presence of CVD risk factors and/or overt CVD, sex-specific changes in the number of cardiomyocytes, extent of the myocardial extracellular matrix, and myocellular hypertrophy promote unique patterns of LV remodeling in men and women. In addition, age- and sex-specific vascular stiffening is also well established, driven by changes in endothelial dysfunction, elastin-collagen content, microvascular dysfunction, and neurohormonal signaling. Together, these changes in LV chamber geometry and morphology, coupled with heightened vascular stiffness, appear to drive both age-related increases in systolic function and declines in diastolic function, particularly in postmenopausal women. Accordingly, estrogen has been implicated as a key mediator, given its direct vasodilating properties, association with nitric oxide excretion, and involvement in myocellular Ca2+ handling, mitochondrial energy production, and oxidative stress. The culmination of the abovementioned sex-specific cardiac and vascular changes across the lifespan provides important insight into heart failure development, particularly of the preserved ejection fraction variety, while offering promise for future preventive strategies and therapeutic approaches.
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Affiliation(s)
- Andrew Oneglia
- Applied Physiology and Advanced Imaging Lab, University of Texas at Arlington, 655 West Mitchell St, Arlington, TX, 76010, USA
| | - Michael D Nelson
- Applied Physiology and Advanced Imaging Lab, University of Texas at Arlington, 655 West Mitchell St, Arlington, TX, 76010, USA
- Barbra Streisand Women's Heart Center, Smidt Heart Institute, Cedars-Sinai Medical Center, 127 S San Vicente Blvd, AHSP Suite A3206, Los Angeles, CA, 90048, USA
| | - C Noel Bairey Merz
- Barbra Streisand Women's Heart Center, Smidt Heart Institute, Cedars-Sinai Medical Center, 127 S San Vicente Blvd, AHSP Suite A3206, Los Angeles, CA, 90048, USA.
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Jiao L, Machuki JO, Wu Q, Shi M, Fu L, Adekunle AO, Tao X, Xu C, Hu X, Yin Z, Sun H. Estrogen and calcium handling proteins: new discoveries and mechanisms in cardiovascular diseases. Am J Physiol Heart Circ Physiol 2020; 318:H820-H829. [PMID: 32083972 DOI: 10.1152/ajpheart.00734.2019] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Estrogen deficiency is considered to be an important factor leading to cardiovascular diseases (CVDs). Indeed, the prevalence of CVDs in postmenopausal women exceeds that of premenopausal women and men of the same age. Recent research findings provide evidence that estrogen plays a pivotal role in the regulation of calcium homeostasis and therefore fine-tunes normal cardiomyocyte contraction and relaxation processes. Disruption of calcium homeostasis is closely associated with the pathological mechanism of CVDs. Thus, this paper maps out and summarizes the effects and mechanisms of estrogen on calcium handling proteins in cardiac myocytes, including L-type Ca2+ channel, the sarcoplasmic reticulum Ca2+ release channel named ryanodine receptor, sarco(endo)plasmic reticulum Ca2+-ATPase, and sodium-calcium exchanger. In so doing, we provide theoretical and experimental evidence for the successful design of estrogen-based prevention and treatment therapies for CVDs.
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Affiliation(s)
- Lijuan Jiao
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | | | - Qi Wu
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Mingjin Shi
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Lu Fu
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | | | - Xi Tao
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Chenxi Xu
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Xide Hu
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Zeyuan Yin
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Hong Sun
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, China
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Sex-Mediated Response to the Beta-Blocker Landiolol in Sepsis: An Experimental, Randomized Study. Crit Care Med 2019; 46:e684-e691. [PMID: 29634521 DOI: 10.1097/ccm.0000000000003146] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES To investigate any gender effect of the beta-1 adrenergic blocker, landiolol, on cardiac performance and energy metabolism in septic rats, and to explore the expression of genes and proteins involved in this process. DESIGN Randomized animal study. SETTING University research laboratory. SUBJECTS Male and female Wistar rats. INTERVENTIONS One hour after cecal ligation and puncture, male and female rats were randomly allocated to the following groups: sham male, cecal ligation and puncture male, cecal ligation and puncture + landiolol male, sham female, cecal ligation and puncture female, and cecal ligation and puncture + landiolol female. Cardiac MRI was carried out 18 hours after cecal ligation and puncture to assess in vivo cardiac function. Ex vivo cardiac function measurement and P magnetic resonance spectroscopy were subsequently performed using an isovolumic isolated heart preparation. Finally, we assessed cardiac gene and protein expression. MEASUREMENTS AND MAIN RESULTS In males, landiolol increased indexed stroke volume by reversing the indexed end-diastolic volume reduction without affecting left ventricle ejection fraction. In females, landiolol did not increase indexed stroke volume and indexed end-diastolic volume but decreased left ventricle ejection fraction. Landiolol had no effect on ex vivo cardiac function and on high-energy phosphate compounds. The effect of landiolol on the gene expression of natriuretic peptide receptor 3 and on protein expression of phosphorylated-AKT:AKT ratio and endothelial nitric oxide synthase was different in males and females. CONCLUSIONS Landiolol improved the in vivo cardiac performance of septic male rats while deleterious effects were reported in females. Expression of natriuretic peptide receptor 3, phosphorylated-AKT:AKT, and endothelial nitric oxide synthase are signaling pathways to investigate to better understand the sex differences in sepsis.
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8
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Felix ACS, Gastaldi AC, Dutra SG, de Freitas ACS, Philbois SV, de Paula Facioli T, Da Silva VJ, Fares TH, de Souza HCD. Early ovarian hormone deprivation increases cardiac contractility in old female rats—Role of physical training. Auton Neurosci 2019; 218:1-9. [DOI: 10.1016/j.autneu.2019.02.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 02/08/2019] [Accepted: 02/10/2019] [Indexed: 12/29/2022]
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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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Mechanism of interleukin-1 receptor antagonist protection against myocardial ischaemia/reperfusion-induced injury. Arch Cardiovasc Dis 2018; 111:545-554. [DOI: 10.1016/j.acvd.2017.12.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 12/05/2017] [Accepted: 12/06/2017] [Indexed: 12/15/2022]
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11
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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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12
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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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13
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Leposavić GM, Pilipović IM. Intrinsic and Extrinsic Thymic Adrenergic Networks: Sex Steroid-Dependent Plasticity. Front Endocrinol (Lausanne) 2018; 9:13. [PMID: 29441042 PMCID: PMC5797573 DOI: 10.3389/fendo.2018.00013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 01/11/2018] [Indexed: 12/30/2022] Open
Abstract
The thymus is sexually differentiated organ providing microenvironment for T-cell precursor differentiation/maturation in the major histocompatibility complex-restricted self-tolerant T cells. With increasing age, the thymus undergoes involution leading to the decline in efficacy of thymopoiesis. Noradrenaline from thymic nerve fibers and "(nor)adrenergic" cells is involved in the regulation of thymopoiesis. In rodents, noradrenaline concentration in thymus and adrenoceptor (AR) expression on thymic cells depend on sex and age. These differences are suggested to be implicated in the development of sexual diergism and the age-related decline in thymopoiesis. The programming of both thymic sexual differentiation and its involution occurs during the critical early perinatal period and may be reprogrammed during peripubertal development. The thymic (re)programming is critically dependent on circulating levels of gonadal steroids. Although the underlying molecular mechanisms have not yet been elucidated fully, it is assumed that the gonadal steroid action during the critical perinatal/peripubertal developmental periods leads to long-lasting changes in the efficacy of thymopoiesis partly through (re)programming of "(nor)adrenergic" cell networks and AR expression on thymic cells.
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Affiliation(s)
- Gordana Momčilo Leposavić
- Department of Physiology, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
- *Correspondence: Gordana Momčilo Leposavić,
| | - Ivan M. Pilipović
- Immunology Research Centre “Branislav Janković”, Institute of Virology, Vaccines and Sera “Torlak”, Belgrade, Serbia
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Parks RJ, Bogachev O, Mackasey M, Ray G, Rose RA, Howlett SE. The impact of ovariectomy on cardiac excitation-contraction coupling is mediated through cAMP/PKA-dependent mechanisms. J Mol Cell Cardiol 2017; 111:51-60. [PMID: 28778766 DOI: 10.1016/j.yjmcc.2017.07.118] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 07/11/2017] [Accepted: 07/28/2017] [Indexed: 12/18/2022]
Abstract
Ovariectomy (OVX) promotes sarcoplasmic reticulum (SR) Ca2+ overload in ventricular myocytes. We hypothesized that the cyclic adenosine monophosphate (cAMP)/protein kinase A (PKA) pathway contributes to this Ca2+ dysregulation. Myocytes were isolated from adult female C57BL/6 mice following either OVX or sham surgery (surgery at ≈1mos). Contractions, Ca2+ concentrations (fura-2) and ionic currents were measured simultaneously (37°C, 2Hz) in voltage-clamped myocytes. Intracellular cAMP levels were determined with an enzyme immunoassay; phosphodiesterase (PDE) and adenylyl cyclase (AC) isoform expression was examined with qPCR. Ca2+ currents were similar in myocytes from sham and OVX mice but Ca2+ transients, excitation-contraction (EC)-coupling gain, SR content and contractions were larger in OVX than sham cells. To determine if the cAMP/PKA pathway mediated OVX-induced alterations in EC-coupling, cardiomyocytes were incubated with the PKA inhibitor H-89 (2μM), which abolished baseline differences. While basal intracellular cAMP did not differ, levels were higher in OVX than sham in the presence of a non-selective PDE inhibitor (300μM IBMX), or an AC activator (10μM forskolin). This suggests the production of cAMP by AC and its breakdown by PDE were enhanced by OVX. Consistent with this, mRNA levels for both AC5 and PDE4A were higher in OVX in comparison to sham. Differences in Ca2+ homeostasis and contractions were abolished when sham and OVX cells were dialyzed with patch pipettes containing the same concentration of 8-bromoadenosine-cAMP (50μM). Interestingly, selective inhibition of PDE4 increased Ca2+ current only in OVX cells. Together, these findings suggest that estrogen suppresses SR Ca2+ release and that this is regulated, at least in part, by the cAMP/PKA pathway. These changes in the cAMP/PKA pathway may promote Ca2+ dysregulation and cardiovascular disease when ovarian estrogen levels fall. These results advance our understanding of female-specific cardiomyocyte mechanisms that may affect responses to therapeutic interventions in older women.
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Affiliation(s)
- Randi J Parks
- Department of Pharmacology, Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada.
| | - Oleg Bogachev
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada.
| | - Martin Mackasey
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada.
| | - Gibanananda Ray
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada.
| | - Robert A Rose
- Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada.
| | - Susan E Howlett
- Department of Pharmacology, Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada; Department of Medicine (Geriatric Medicine), Faculty of Medicine, Dalhousie University, 5850 College Street, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada.
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Liu Y, Zhang J, Liu S, Wang W, Chen X, Jiang H, Li J, Wang K, Bai W, Zhang H, Qin L. Effects of oestrogen andCimicifuga racemosaon the cardiac noradrenaline pathway of ovariectomized rats. Exp Physiol 2017; 102:974-984. [PMID: 28590038 DOI: 10.1113/ep086285] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 06/05/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Yao Liu
- Department of Cardiology; Peking University People's Hospital; Beijing 100044 China
| | - Jing Zhang
- Department of Anatomy and Embryology; Peking University Health Science Center; Beijing 100191 China
| | - Shuya Liu
- Department of Stomatology; General Hospital of Armed Police; Beijing 100039 China
| | - Wenjuan Wang
- Department of Anatomy and Embryology; Peking University Health Science Center; Beijing 100191 China
| | - Xing Chen
- Department of Obstetrics and Gynecology; Peking University First Hospital; 100034 Beijing China
| | - Hai Jiang
- Department of Anatomy and Embryology; Peking University Health Science Center; Beijing 100191 China
| | - Junlei Li
- Department of Cardiology; Peking University People's Hospital; Beijing 100044 China
| | - Ke Wang
- Department of Anatomy and Embryology; Peking University Health Science Center; Beijing 100191 China
| | - Wenpei Bai
- Department of Obstetrics and Gynecology; Shijitan Hospital; Beijing 100038 China
| | - Haicheng Zhang
- Department of Cardiology; Peking University People's Hospital; Beijing 100044 China
| | - Lihua Qin
- Department of Anatomy and Embryology; Peking University Health Science Center; Beijing 100191 China
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Changes in cardiovascular function based on adrenalin and norepinephrine metabolism in ovariectomized rats. Exp Gerontol 2017; 91:15-24. [DOI: 10.1016/j.exger.2017.02.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 01/19/2017] [Accepted: 02/13/2017] [Indexed: 10/20/2022]
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Zhu S, Xu T, Luo Y, Zhang Y, Xuan H, Ma Y, Pan D, Li D, Zhu H. Luteolin Enhances Sarcoplasmic Reticulum Ca2+-ATPase Activity through p38 MAPK Signaling thus Improving Rat Cardiac Function after Ischemia/Reperfusion. Cell Physiol Biochem 2017; 41:999-1010. [DOI: 10.1159/000460837] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 12/01/2016] [Indexed: 01/15/2023] Open
Abstract
Background/Aims: A major challenge for current therapeutic strategies against ischemia/reperfusion (I/R) is the lack of effective drugs. Considering luteolin enhances the activity of sarcoplasmic reticulum Ca2+-ATPase (SERCA2a) to improve the systolic/diastolic function of rat hearts and cardiomyocytes during the I/R process, we studied the regulatory function of the p38 MAPK pathway in this protective mechanism. Methods: Isolated cardiomyocytes and perfused hearts were separately divided into five groups and used to investigate I/R. The phosphorylation of p38 and phospholamban (p-PLB), the levels and activity of SERCA2a and the levels of proteins related to apoptosis were measured. Apoptotic cells were assessed using the TUNEL assay. Single-cell shortening, Ca2+ transients, and the decay of the mitochondrial membrane potential (Δψm) were detected. Results: The p38 MAPK pathway was activated during the I/R process, and inhibiting it with SB203580 promoted p-PLB, which enhanced the activity of SERCA2a and relieved the calcium overload to promote the recovery of the Δψm and reduce cardiomyocyte apoptosis in I/R. Luteolin also suppressed the activation of the p38 MAPK pathway and showed cardioprotective effects during I/R injury. Conclusions: We conclude that luteolin enhances SERCA2a activity to improve systolic/diastolic function during I/R in rat hearts and cardiomyocytes by attenuating the inhibitive effects of the p38 pathway on p-PLB.
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Blenck CL, Harvey PA, Reckelhoff JF, Leinwand LA. The Importance of Biological Sex and Estrogen in Rodent Models of Cardiovascular Health and Disease. Circ Res 2016; 118:1294-312. [PMID: 27081111 DOI: 10.1161/circresaha.116.307509] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 03/21/2016] [Indexed: 01/01/2023]
Abstract
Nearly one-third of deaths in the United States are caused by cardiovascular disease (CVD) each year. In the past, CVD was thought to mainly affect men, leading to the exclusion of women and female animals from clinical studies and preclinical research. In light of sexual dimorphisms in CVD, a need exists to examine baseline cardiac differences in humans and the animals used to model CVD. In humans, sex differences are apparent at every level of cardiovascular physiology from action potential duration and mitochondrial energetics to cardiac myocyte and whole-heart contractile function. Biological sex is an important modifier of the development of CVD with younger women generally being protected, but this cardioprotection is lost later in life, suggesting a role for estrogen. Although endogenous estrogen is most likely a mediator of the observed functional differences in both health and disease, the signaling mechanisms involved are complex and are not yet fully understood. To investigate how sex modulates CVD development, animal models are essential tools and should be useful in the development of therapeutics. This review will focus on describing the cardiovascular sexual dimorphisms that exist both physiologically and in common animal models of CVD.
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Affiliation(s)
- Christa L Blenck
- From the Department of Molecular, Cellular, and Developmental Biology & BioFrontiers Institute, University of Colorado, Boulder (C.L.B., P.A.H., L.A.L.); and Women's Health Research Center and Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson (J.F.R.)
| | - Pamela A Harvey
- From the Department of Molecular, Cellular, and Developmental Biology & BioFrontiers Institute, University of Colorado, Boulder (C.L.B., P.A.H., L.A.L.); and Women's Health Research Center and Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson (J.F.R.)
| | - Jane F Reckelhoff
- From the Department of Molecular, Cellular, and Developmental Biology & BioFrontiers Institute, University of Colorado, Boulder (C.L.B., P.A.H., L.A.L.); and Women's Health Research Center and Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson (J.F.R.)
| | - Leslie A Leinwand
- From the Department of Molecular, Cellular, and Developmental Biology & BioFrontiers Institute, University of Colorado, Boulder (C.L.B., P.A.H., L.A.L.); and Women's Health Research Center and Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson (J.F.R.).
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Lee J, Kim B, Park MH, Choi KH, Kong C, Lee SH, Kim YY, Yu KH, Kim M. Effects of Colpomenia sinuosa Extract on Serum Lipid Level and Bone Formation in Ovariectomized Rats. ACTA ACUST UNITED AC 2016. [DOI: 10.3746/jkfn.2016.45.4.492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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20
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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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Sivasinprasasn S, Shinlapawittayatorn K, Chattipakorn SC, Chattipakorn N. Estrogenic Impact on Cardiac Ischemic/Reperfusion Injury. J Cardiovasc Transl Res 2016; 9:23-39. [PMID: 26786980 DOI: 10.1007/s12265-016-9675-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 01/07/2016] [Indexed: 11/29/2022]
Abstract
The increase in cardiovascular disease and metabolic syndrome incidence following the onset of menopause has highlighted the role of estrogen as a cardiometabolic protective agent. Specifically regarding the heart, estrogen induced an improvement in cardiac function, preserved calcium homeostasis, and inhibited the mitochondrial apoptotic pathway. The beneficial effects of estrogen in relation to cardiac ischemia/reperfusion (I/R) injury, such as reduced infarction and ameliorated post-ischemic recovery, have also been shown. Nevertheless, controversial findings exist and estrogen therapy is reported to be related to a higher rate of thromboembolic events and atrial fibrillation in post-menopausal women. Therefore, greater clarification is needed to evaluate the exact potential of estrogen use in cases of cardiac I/R injury. This article reviews the effects of estrogen, in both acute and chronic treatment, and collates the studies with regard to their in vivo, in vitro, or clinical trial settings in cases of cardiac I/R injury and myocardial infarction.
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Affiliation(s)
- Sivaporn Sivasinprasasn
- Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.,Cardiac Electrophysiology unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.,School of Medicine, Mae Fah Luang University, Chiang Rai, Thailand.,Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai, Thailand
| | - Krekwit Shinlapawittayatorn
- Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.,Cardiac Electrophysiology unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.,Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai, Thailand
| | - Siriporn C Chattipakorn
- Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.,Department of Oral Biology and Diagnostic Science, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand.,Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai, Thailand
| | - Nipon Chattipakorn
- Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand. .,Cardiac Electrophysiology unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand. .,Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai, Thailand.
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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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23
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Kalász J, Tóth EP, Bódi B, Fagyas M, Tóth A, Pal BH, Vari SG, Balog M, Blažetić S, Heffer M, Papp Z, Borbély A. Single acute stress-induced progesterone and ovariectomy alter cardiomyocyte contractile function in female rats. Croat Med J 2014; 55:239-49. [PMID: 24891282 PMCID: PMC4049214 DOI: 10.3325/cmj.2014.55.239] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Aim To assess how ovarian-derived sex hormones (in particular progesterone) modify the effects of single acute stress on the mechanical and biochemical properties of left ventricular cardiomyocytes in the rat. Methods Non-ovariectomized (control, n = 8) and ovariectomized (OVX, n = 8) female rats were kept under normal conditions or were exposed to stress (control-S, n = 8 and OVX-S, n = 8). Serum progesterone levels were measured using a chemiluminescent immunoassay. Left ventricular myocardial samples were used for isometric force measurements and protein analysis. Ca2+-dependent active force (Factive), Ca2+-independent passive force (Fpassive), and Ca2+-sensitivity of force production were determined in single, mechanically isolated, permeabilized cardiomyocytes. Stress- and ovariectomy-induced alterations in myofilament proteins (myosin-binding protein C [MyBP-C], troponin I [TnI], and titin) were analyzed by sodium dodecyl sulfate gel electrophoresis using protein and phosphoprotein stainings. Results Serum progesterone levels were significantly increased in stressed rats (control-S, 35.6 ± 4.8 ng/mL and OVX-S, 21.9 ± 4.0 ng/mL) compared to control (10 ± 2.9 ng/mL) and OVX (2.8 ± 0.5 ng/mL) groups. Factive was higher in the OVX groups (OVX, 25.9 ± 3.4 kN/m2 and OVX-S, 26.3 ± 3.0 kN/m2) than in control groups (control, 16.4 ± 1.2 kN/m2 and control-S, 14.4 ± 0.9 kN/m2). Regarding the potential molecular mechanisms, Factive correlated with MyBP-C phosphorylation, while myofilament Ca2+-sensitivity inversely correlated with serum progesterone levels when the mean values were plotted for all animal groups. Fpassive was unaffected by any treatment. Conclusion Stress increases ovary-independent synthesis and release of progesterone, which may regulate Ca2+-sensitivity of force production in left ventricular cardiomyocytes. Stress and female hormones differently alter Ca2+-dependent cardiomyocyte contractile force production, which may have pathophysiological importance during stress conditions affecting postmenopausal women.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Attila Borbély
- Attila Borbély, University of Debrecen, Institute of Cardiology, Division of Clinical Physiology, Móricz Zsigmond krt. 22, H-4032 Debrecen, Hungary,
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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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Obradovic M, Stewart AJ, Pitt SJ, Labudovic-Borovic M, Sudar E, Petrovic V, Zafirovic S, Maravic-Stojkovic V, Vasic V, Isenovic ER. In vivo effects of 17β-estradiol on cardiac Na(+)/K(+)-ATPase expression and activity in rat heart. Mol Cell Endocrinol 2014; 388:58-68. [PMID: 24662727 DOI: 10.1016/j.mce.2014.03.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Revised: 03/15/2014] [Accepted: 03/15/2014] [Indexed: 12/24/2022]
Abstract
In this study the in vivo effects of estradiol in regulating Na(+)/K(+)-ATPase function in rat heart was studied. Adult male Wistar rats were treated with estradiol (40μg/kg, i.p.) and after 24h the animals were sacrificed and the heart excised. Following estradiol administration, cardiac Na(+)/K(+)-ATPase activity, expression of the α1 subunit, and phosphorylation of the α1 subunit were significantly increased. These animals also had significantly decreased levels of digoxin-like immunoreactive factor(s). Na(+) levels were also significantly reduced but to a level that was still within the normal physiological range, highlighting the ability of the Na(+)/K(+)-ATPase to balance the ionic composition following treatment with estradiol. Estradiol treated rats also showed increased phosphorylation of protein kinase B (Akt), and extracellular-signal-regulated kinase 1/2 (ERK1/2). We therefore suggest a role for Akt and/or ERK1/2 in estradiol-mediated regulation of cardiac Na(+)/K(+)-ATPase expression and activity in rat heart.
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Affiliation(s)
- Milan Obradovic
- Institute of Nuclear Sciences Vinca, University of Belgrade, Laboratory of Radiobiology and Molecular Genetics, Mike Petrovica Alasa 12-14, 11000 Belgrade, Serbia.
| | - Alan J Stewart
- School of Medicine, University of St Andrews, North Haugh, St Andrews KY16 9TF, United Kingdom.
| | - Samantha J Pitt
- School of Medicine, University of St Andrews, North Haugh, St Andrews KY16 9TF, United Kingdom.
| | - Milica Labudovic-Borovic
- Institute of Histology and Embryology "Aleksandar Đ. Kostić", Faculty of Medicine, University of Belgrade, Visegradska 26, 11000 Belgrade, Serbia.
| | - Emina Sudar
- Institute of Nuclear Sciences Vinca, University of Belgrade, Laboratory of Radiobiology and Molecular Genetics, Mike Petrovica Alasa 12-14, 11000 Belgrade, Serbia.
| | - Voin Petrovic
- Institute of Nuclear Sciences Vinca, University of Belgrade, Laboratory of Physical Chemistry, Mike Petrovica Alasa 12-14, 11000 Belgrade, Serbia.
| | - Sonja Zafirovic
- Institute of Nuclear Sciences Vinca, University of Belgrade, Laboratory of Radiobiology and Molecular Genetics, Mike Petrovica Alasa 12-14, 11000 Belgrade, Serbia.
| | - Vera Maravic-Stojkovic
- Dedinje Cardiovascular Institute, Belgrade University, School of Medicine, Heroja Milana Tepica 1, 11000 Belgrade, Serbia.
| | - Vesna Vasic
- Institute of Nuclear Sciences Vinca, University of Belgrade, Laboratory of Physical Chemistry, Mike Petrovica Alasa 12-14, 11000 Belgrade, Serbia.
| | - Esma R Isenovic
- Institute of Nuclear Sciences Vinca, University of Belgrade, Laboratory of Radiobiology and Molecular Genetics, Mike Petrovica Alasa 12-14, 11000 Belgrade, Serbia.
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MacDonald JK, Pyle WG, Reitz CJ, Howlett SE. Cardiac contraction, calcium transients, and myofilament calcium sensitivity fluctuate with the estrous cycle in young adult female mice. Am J Physiol Heart Circ Physiol 2014; 306:H938-53. [DOI: 10.1152/ajpheart.00730.2013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
This study established conditions to induce regular estrous cycles in female C57BL/6J mice and investigated the impact of the estrous cycle on contractions, Ca2+ transients, and underlying cardiac excitation-contraction (EC)-coupling mechanisms. Daily vaginal smears from group-housed virgin female mice were stained to distinguish estrous stage (proestrus, estrus, metestrus, diestrus). Ventricular myocytes were isolated from anesthetized mice. Contractions and Ca2+ transients were measured simultaneously (4 Hz, 37°C). Interestingly, mice did not exhibit regular cycles unless they were exposed to male pheromones in bedding added to their cages. Field-stimulated myocytes from mice in estrus had larger contractions (∼2-fold increase), larger Ca2+ transients (∼1.11-fold increase), and longer action potentials (>2-fold increase) compared with other stages. Larger contractions and Ca2+ transients were not observed in estrus myocytes voltage-clamped with shorter action potentials. Voltage-clamp experiments also demonstrated that estrous stage had no effect on Ca2+ current, EC-coupling gain, diastolic Ca2+, sarcoplasmic reticulum (SR) Ca2+ content, or fractional release. Although contractions were largest in estrus, myofilament Ca2+ sensitivity was lowest (EC50 values ∼1.15-fold higher) in conjunction with increased phosphorylation of myosin binding protein C in estrus. Contractions were enhanced in ventricular myocytes from mice in estrus because action potential prolongation increased SR Ca2+ release. These findings demonstrate that cyclical changes in reproductive hormones associated with the estrous cycle can influence myocardial electrical and contractile function and modify Ca2+ homeostasis. However, such changes are unlikely to occur in female mice housed in groups under conventional conditions, since these mice do not exhibit regular estrous cycles.
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Affiliation(s)
| | - W. Glen Pyle
- Cardiovascular Research Group, Department of Biomedical Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Cristine J. Reitz
- Cardiovascular Research Group, Department of Biomedical Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Susan E. Howlett
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Medicine (Geriatric Medicine), Dalhousie University, Halifax, Nova Scotia, Canada
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Dose-effects of aorta-infused clenbuterol on spinal cord ischemia-reperfusion injury in rabbits. PLoS One 2013; 8:e84095. [PMID: 24391890 PMCID: PMC3877193 DOI: 10.1371/journal.pone.0084095] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Accepted: 11/11/2013] [Indexed: 01/17/2023] Open
Abstract
Background The β2 adrenergic receptor (β2AR) plays an important role in ischemia-reperfusion (I/R) injury in various organs. Recently, a selective β2AR agonist clenbuterol was suggested to protect against cerebral I/R injury. This study was designed to investigate changes of β2ARs after spinal cord I/R injury and dose-effects of aorta-infused clenbuterol on spinal cord I/R injury in rabbits. Methods Spinal cord ischemia was induced in New Zealand white rabbits by infrarenal abdominal aortic occlusion with a balloon catheter for 30 minutes except the sham group. During occlusion, nothing (I/R group), normal saline (NS group) or clenbuterol at different doses of 0.005, 0.01, 0.05, 0.1, 0.5, or 1 mg/kg (C0.005, C0.01, C0.05, C0.1, C0.5, and C1 groups) was infused into the occluded aortic segments. The hemodynamic data, blood glucose and serum electrolytes were measured during experimental period. Neurological function was assessed according to the modified Tarlov scales until 48 hours after reperfusion. After that, the lumbar spinal cord was harvested for β2AR immunohistochemistry and histopathologic evaluation in the anterior horns. Results The β2AR expression in the anterior horns of the spinal cord was significantly higher in the I/R group than in the sham group. Tarlov scores and the number of viable α-motor neurons were higher in C0.01-C0.5 groups than in the NS group, C0.005 and C1 groups and were highest in the C0.1 group. Hypotension and hyperglycemia were found in the C1 group. Conclusion β2ARs in the anterior horn were upregulated after spinal cord I/R injury. Aortic-infused clenbuterol (0.01–0.5 mg/kg) can attenuate spinal cord I/R injury dose-dependently during the ischemic period. The Optimal dosage was 0.1 mg/kg. Activation of β2AR could be a new therapeutic strategy for the treatment of spinal cord I/R injury.
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Wu X, Xu T, Li D, Zhu S, Chen Q, Hu W, Pan D, Zhu H, Sun H. ERK/PP1a/PLB/SERCA2a and JNK pathways are involved in luteolin-mediated protection of rat hearts and cardiomyocytes following ischemia/reperfusion. PLoS One 2013; 8:e82957. [PMID: 24386130 PMCID: PMC3875429 DOI: 10.1371/journal.pone.0082957] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Accepted: 10/29/2013] [Indexed: 11/19/2022] Open
Abstract
Luteolin has long been used in traditional Chinese medicine for treatment of various diseases. Recent studies have suggested that administration of luteolin yields cardioprotective effects during ischemia/reperfusion (I/R) in rats. However, the precise mechanisms of this action remain unclear. The aim of this study is to confirm that luteolin-mediated extracellular signal regulated kinase (ERK1/2) and c-Jun N-terminal kinase (JNK) pathways are responsible for their cardioprotective effects during I/R. Wistar rats were divided into the following groups: (i) DMSO group (DMSO); (ii) I/R group (I/R); (iii) luteolin+I/R group (Lut+I/R); (iv) ERK1/2 inhibitor PD98059+I/R group (PD+I/R); (v) PD98059+luteolin+I/R group (PD+Lut+I/R); and (vi) JNK inhibitor SP600125+I/R group (SP+I/R). The following properties were measured: contractile function of isolated heart and cardiomyocytes; infarct size; the release of lactate dehydrogenase (LDH); the percentage of apoptotic cells; the expression levels of Bcl-2 and Bax; and phosphorylation status of ERK1/2, JNK, type 1 protein phosphatase (PP1a), phospholamban (PLB) and sarcoplasmic reticulum Ca2+-ATPase (SERCA2a). Our data showed that pretreatment with luteolin or SP600125 significantly improved the contraction of the isolated heart and cardiomyocytes, reduced infarct size and LDH activity, decreased the rate of apoptosis and increased the Bcl-2/Bax ratio. However, pretreatment with PD98059 alone before I/R had no effect on the above indexes. Further, these consequences of luteolin pretreatment were abrogated by co-administration of PD98059. We also found that pretreatment with PD98059 caused a significant increase in JNK expression, and SP600125 could cause ERK1/2 activation during I/R. In addition, we are the first to demonstrate that luteolin affects PP1a expression, which results in the up-regulation of the PLB, thereby relieving its inhibition of SERCA2a. These results showed that luteolin improves cardiomyocyte contractile function after I/R injury by an ERK1/2-PP1a-PLB-SERCA2a-mediated mechanism independent of JNK signaling pathway.
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Affiliation(s)
- Xin Wu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Tongda Xu
- Department of The First Clinical College, Nanjing Traditional Chinese Medicine University, Nanjing, Jiangsu, PR China
| | - Dongye Li
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
- Department of The First Clinical College, Nanjing Traditional Chinese Medicine University, Nanjing, Jiangsu, PR China
- * E-mail: (DL); (HS)
| | - Shasha Zhu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Qiuping Chen
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Wenjing Hu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Defeng Pan
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Hong Zhu
- Institute of Cardiovascular Disease Research, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
| | - Hong Sun
- Department of Physiology, Xuzhou Medical College, Xuzhou, Jiangsu, PR China
- * E-mail: (DL); (HS)
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Fares E, Pyle WG, Ray G, Rose RA, Denovan-Wright EM, Chen RP, Howlett SE. The impact of ovariectomy on calcium homeostasis and myofilament calcium sensitivity in the aging mouse heart. PLoS One 2013; 8:e74719. [PMID: 24058623 PMCID: PMC3776741 DOI: 10.1371/journal.pone.0074719] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 08/05/2013] [Indexed: 12/20/2022] Open
Abstract
This study determined whether deficiency of ovarian estrogen starting very early in life promoted age-associated Ca(2+) dysregulation and contractile dysfunction in isolated ventricular myocytes. Myocytes were isolated from anesthetized C57BL/6 female mice. Animals received an ovariectomy or sham-operation at one month and were aged to ~24 months. Excitation-contraction coupling parameters were compared in fura-2 loaded myocytes (37°C). While Ca(2+) transients were larger and faster in field-stimulated myocytes from ovariectomized mice, ovariectomy had no effect on peak fractional shortening. Similarly, ovariectomy had no effect on fractional shortening measured in vivo by echocardiography (values were 60.5 ± 2.9 vs. 60.3 ± 2.5% in sham and ovariectomized, respectively; n=5 mice/group). Ovariectomy did decrease myofilament Ca(2+) sensitivity, as evidenced by a 26% increase in the Ca(2+) required to activate actomyosin MgATPase in ovariectomized hearts. Larger Ca(2+) transients were attributable to a 48% increase in peak Ca(2+) current, along with an increase in the amplitude, width and frequency of Ca(2+) sparks measured in fluo-4 loaded myocytes. These changes in Ca(2+) handling were not due to increased expression of Ca(2+) channels (Cav1.2), sarcoplasmic reticulum Ca(2+) ATPase (SERCA2) or Na(+)-Ca(2+) exchanger in ovariectomized hearts. However, ovariectomy increased sarcoplasmic reticulum Ca(2+) stores by ~90% and promoted spontaneous Ca(2+) release from the sarcoplasmic reticulum when compared to sham controls. These observations demonstrate that long-term ovariectomy promotes intracellular Ca(2+) dysregulation, reduces myofilament Ca(2+) sensitivity and increases spontaneous Ca(2+) release in the aging female heart.
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Affiliation(s)
- Elias Fares
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - W. Glen Pyle
- Cardiovascular Research Group, Department of Biomedical Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Gibanananda Ray
- Department of Physiology & Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Robert A. Rose
- Department of Physiology & Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada
| | | | - Robert P. Chen
- Pediatric Cardiology, IWK Health Centre and Dalhousie University, Halifax, Nova Scotia, Canada
| | - Susan E. Howlett
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Medicine (Geriatric Medicine), Dalhousie University, Halifax, Nova Scotia, Canada
- * E-mail:
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Miao G, Chen Z, Fang X, Liu M, Hao G, An H, Zhang Z, Lu L, Zhang J, Zhang L. Relationship between the autoantibody and expression of β3-adrenoceptor in lung and heart. PLoS One 2013; 8:e68747. [PMID: 23861938 PMCID: PMC3702604 DOI: 10.1371/journal.pone.0068747] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Accepted: 06/03/2013] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Evidences suggest that β3 -adrenoceptor (β3-AR) plays an important role in heart failure (HF), although no data is reported indicating how these effects may change with the increasing age. Pulmonary congestion and edema are the major life-threatening complications associated with HF. The purpose of this study is to explore the relationship between the anti-β3-AR autoantibody and the expression of β3-AR in the lungs and heart for both aged patients and rats with HF. METHODS Synthetic β3-AR peptides served as the target antigens in ELISA were used to screen the anti-β3-AR autoantibody in aged patients and rats. Two aged rat models were constructed based on aortic banding and sham-operation. The expression of β3-AR mRNA and protein in the lung and heart was measured in intervention and non-intervention groups by Western blot analysis at the baseline, 5(th), 7(th), 9(th) and 11(th) week, respectively. RESULTS The frequency and titer of anti-β3-AR autoantibody in aged patients and rats with HF were higher than those in the control group (p<0.05). The expression of β3-AR mRNA and protein in pulmonary tissues decreased continually from the 7(th) week (p<0.05), followed by HF observed during the 9(th) week. The expression of β3-AR in myocardial tissues continued to increase after the 9(th) week (p<0.05), and the expression of both β3-AR mRNA and protein in the BRL group [HF group with BRL37344 (4-[-[2-hydroxy-(3-chlorophenyl)ethyl-amino] phenoxyacetic acid) (a β3-AR agonist) injection] was positively correlated with BRL37344 when compared with non-BRL group (HF group without BRL37344 injection) (p<0.05). CONCLUSION Anti-β3-AR autoantibody was detected in aged patients and rats with HF. The expression of β3-AR mRNA and protein in pulmonary tissues decreased continually, and began earlier than in the heart, but its expression in myocardial tissues increased continually and could be further promoted by β3-AR agonist.
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Affiliation(s)
- Guobin Miao
- Department of Internal Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Zhe Chen
- Department of Internal Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Xiangyang Fang
- Department of Internal Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Miaobing Liu
- Department of Internal Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Gang Hao
- Department of Pathophysiology, Capital Medical University, Beijing, China
| | - Huiling An
- Department of Internal Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Zhiyong Zhang
- Heart Failure Center, Department of Cardiology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Lingqiao Lu
- Department of Pathophysiology, Capital Medical University, Beijing, China
| | - Jian Zhang
- Medical and Health Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
- * E-mail: (JZ); (LZ)
| | - Lin Zhang
- Heart Failure Center, Department of Cardiology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
- * E-mail: (JZ); (LZ)
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Meitzen J, Perry AN, Westenbroek C, Hedges VL, Becker JB, Mermelstein PG. Enhanced striatal β1-adrenergic receptor expression following hormone loss in adulthood is programmed by both early sexual differentiation and puberty: a study of humans and rats. Endocrinology 2013; 154:1820-31. [PMID: 23533220 PMCID: PMC3628022 DOI: 10.1210/en.2012-2131] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
After reproductive senescence or gonadectomy, changes occur in neural gene expression, ultimately altering brain function. The endocrine mechanisms underlying these changes in gene expression beyond immediate hormone loss are poorly understood. To investigate this, we measured changes in gene expression the dorsal striatum, where 17β-estradiol modulates catecholamine signaling. In human caudate, quantitative PCR determined a significant elevation in β1-adrenergic receptor (β1AR) expression in menopausal females when compared with similarly aged males. No differences were detected in β2-adrenergic and D1- and D2-dopamine receptor expression. Consistent with humans, adult ovariectomized female rats exhibited a similar increase in β1AR expression when compared with gonadectomized males. No sex difference in β1AR expression was detected between intact adults, prepubertal juveniles, or adults gonadectomized before puberty, indicating the necessity of pubertal development and adult ovariectomy. Additionally, increased β1AR expression in adult ovariectomized females was not observed if animals were masculinized/defeminized with testosterone injections as neonates. To generate a model system for assessing functional impact, increased β1AR expression was induced in female-derived cultured striatal neurons via exposure to and then removal of hormone-containing serum. Increased β1AR action on cAMP formation, cAMP response element-binding protein phosphorylation and gene expression was observed. This up-regulation of β1AR action was eliminated with 17β-estradiol addition to the media, directly implicating this hormone as a regulator of β1AR expression. Beyond having implications for the known sex differences in striatal function and pathologies, these data collectively demonstrate that critical periods early in life and at puberty program adult gene responsiveness to hormone loss after gonadectomy and potentially reproductive senescence.
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Affiliation(s)
- John Meitzen
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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Patrizio M, Musumeci M, Piccone A, Raggi C, Mattei E, Marano G. Hormonal regulation of β-myosin heavy chain expression in the mouse left ventricle. J Endocrinol 2013. [PMID: 23179080 DOI: 10.1530/joe-12-0201] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We investigated the influence of sex hormones on the expression of α- and β-cardiac myosin heavy chain isoforms (α-MHC and β-MHC) in C57bl/6 mice of both sexes under physiological and pathological conditions. In the left ventricles (LVs) of fertile female mice, β-MHC expression was tenfold higher compared with the age-matched males, whereas no difference was found in α-MHC expression. These differences disappeared after ovariectomy or in immature mice. We also found a sex-related difference in expression of β-adrenoceptors (β1-AR), as mRNA levels of this gene were 40% lower in fertile females compared with males of the same age but did not differ in prepubertal or ovariectomized animals. Interestingly, the deletion of both β1- and β2-ARs abolished sex difference of β-MHC expression, as mRNA levels in the LVs of knockout males were increased and reached values comparable to those of knockout females. Moreover, the β1-AR antagonist metoprolol induced about a threefold increase in β-MHC expression in adult male mice. The capability of gender to regulate β-MHC expression was also evaluated in the presence of hemodynamic overload. Thoracic aortic coarctation (TAC) produced cardiac hypertrophy along with a 12-fold increase in β-MHC and a 50% decrease in β1-AR expression in males but not in females, thus abolishing the gender difference observed in sham animals for such genes. By contrast, TAC did not change β2-AR expression. In conclusion, our results show that the expression of β-MHC and β1-AR in the LVs undergo gender-related and correlated changes under both physiological and pathological conditions and suggest a role of β1-AR-mediated signaling.
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Affiliation(s)
- Mario Patrizio
- Department of Drug Research and Evaluation, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
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Sex differences in mechanisms of cardiac excitation-contraction coupling. Pflugers Arch 2013; 465:747-63. [PMID: 23417603 PMCID: PMC3651827 DOI: 10.1007/s00424-013-1233-0] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 01/29/2013] [Accepted: 01/30/2013] [Indexed: 11/25/2022]
Abstract
The incidence and expression of cardiovascular diseases differs between the sexes. This is not surprising, as cardiac physiology differs between men and women. Clinical and basic science investigations have shown important sex differences in cardiac structure and function. The pervasiveness of sex differences suggests that such differences must be fundamental, likely operating at a cellular level. Indeed, studies have shown that isolated ventricular myocytes from female animals have smaller and slower contractions and underlying calcium transients compared to males. Recent evidence suggests that this arises from sex differences in components of the cardiac excitation–contraction coupling pathway, the sequence of events linking myocyte depolarization to calcium release from the sarcoplasmic reticulum and subsequent contraction. The concept that sex hormones may regulate intracellular calcium at the level of the cardiomyocyte is important, as levels of these hormones decline in both men and women as the incidence of cardiovascular disease rises. This review focuses on the impact of sex on cardiac contraction, in particular at the cellular level, and highlights specific components of the excitation–contraction coupling pathway that differ between the sexes. Understanding sex hormone regulation of calcium homeostasis in the heart may reveal new avenues for therapeutic strategies to treat cardiac dysfunction and cardiovascular diseases.
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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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Dent MR, Tappia PS, Dhalla NS. Gender related alterations of β-adrenoceptor mechanisms in heart failure due to arteriovenous fistula. J Cell Physiol 2012; 227:3080-7. [PMID: 22015551 DOI: 10.1002/jcp.23058] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This study was undertaken to determine gender related changes in different components of β-adrenoceptor (β-AR) system in response to arteriovenous fistula (AV-shunt), which is known to produce heart failure due to volume overload. AV-shunt was induced in male and female rats for 16 weeks by the needle technique; ovariectomized (OVX) rats treated with or without estrogen were also used. Although AV-shunt for 16 weeks produced cardiac hypertrophy in both sexes, male animals showed cardiac dysfunction whereas cardiac performance was maintained in females. Both β(1) -AR and β(2) -AR protein content and mRNA levels were decreased in male and increased in female hearts post-AV-shunt. The basal adenylyl cyclase (AC) activity was lower in the female heart; however, AC protein content and the increase in epinephrine (EPi)-stimulated AC activity were greater in the female AV-shunt group as compared to males. While AC V/VI and β-arrestin 2 mRNA levels were decreased in males, mRNA level for GRK2 was increased in females post-AV-shunt. In contrast to intact females, AV-shunt OVX animals showed depressed cardiac function, decreased β(1) -AR, β(2) -AR, and AC protein content, as well as reduced EPi-stimulated AC activity. Treatment of OVX rats with 17-β estradiol attenuated the AV-shunt induced changes in β-AR and AC protein content as well as cardiac dysfunction. These results reveal that β-AR signal transduction system in response to AV-shunt is downregulated in males and upregulated in females. Furthermore, estrogen appears to play an important role in the upregulation of β-AR mechanisms and the maintenance of cardiac function in AV-shunt females.
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Affiliation(s)
- Melissa R Dent
- Faculty of Medicine, Department of Physiology, University of Manitoba, Institute of Cardiovascular Sciences, St. Boniface Hospital Research, Winnipeg, Canada
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36
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Ross JL, Howlett SE. Age and ovariectomy abolish beneficial effects of female sex on rat ventricular myocytes exposed to simulated ischemia and reperfusion. PLoS One 2012; 7:e38425. [PMID: 22701638 PMCID: PMC3368849 DOI: 10.1371/journal.pone.0038425] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Accepted: 05/09/2012] [Indexed: 12/24/2022] Open
Abstract
Sex differences in responses to myocardial ischemia have been described, but whether cardiomyocyte function is influenced by sex in the setting of ischemia and reperfusion has not been elucidated. This study compared contractions and intracellular Ca2+ in isolated ventricular myocytes exposed to ischemia and reperfusion. Cells were isolated from anesthetized 3-month-old male and female Fischer 344 rats, paced at 4 Hz (37°C), exposed to simulated ischemia (20 mins) and reperfused. Cell shortening (edge detector) and intracellular Ca2+ (fura-2) were measured simultaneously. Cell viability was assessed with Trypan blue. Ischemia reduced peak contractions and increased Ca2+ levels equally in myocytes from both sexes. However, contraction amplitudes were reduced in reperfusion in male myocytes, while contractions recovered to exceed control levels in females (62.6±5.1 vs. 140.1±15.8%; p<0.05). Only 60% of male myocytes excluded trypan blue dye after ischemia and reperfusion, while all female cardiomyocytes excluded the dye (p<0.05). Parallel experiments were conducted in myocytes from ∼24-month-old female rats or 5–6-month-old rats that had an ovariectomy at 3–4 weeks of age. Beneficial effects of female sex on myocyte viability and contractile dysfunction in reperfusion were abolished in cells from 24-month-old females. Aged female myocytes also exhibited elevated intracellular Ca2+ and alternans in ischemia. Cells from ovariectomized rats displayed increased Ca2+ transients and spontaneous activity in ischemia compared to sham-operated controls. None of the myocytes from ovariectomized rats were viable after 15 minutes of ischemia, while 75% of sham cells remained viable at end of reperfusion (p<0.05). These findings demonstrate that cardiomyocytes from young adult females are more resistant to ischemia and reperfusion injury than cells from males. Age and OVX abolish these beneficial effects and induce Ca2+ dysregulation at the level of the cardiomyocyte. Thus, beneficial effects of estrogen in ischemia and reperfusion are mediated, in part, by effects on cardiomyocytes.
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Affiliation(s)
- Jenna L. Ross
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Susan E. Howlett
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
- Division of Geriatric Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
- * E-mail:
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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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Jiang X, Gao L, Zhang Y, Wang G, Liu Y, Yan C, Sun H. A comparison of the effects of ketamine, chloral hydrate and pentobarbital sodium anesthesia on isolated rat hearts and cardiomyocytes. J Cardiovasc Med (Hagerstown) 2012; 12:732-5. [PMID: 21873882 DOI: 10.2459/jcm.0b013e32834a6697] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVES The study was intended to investigate which commonly used anesthetic in intact animals has the least effect on the function of isolated hearts and cardiomyocytes among the anesthetized animals. METHODS The hearts of male Sprague-Dawley rats were removed after they were anesthetized with ketamine, chloral hydrate or pentobarbital sodium, respectively, or were cervically dislocated. They were mounted on a Langendorff shelf. Heart rate (HR), left ventricular systolic pressure (LVSP), and maximal rate of increase of left ventricular pressure (+dp/dt) were observed and recorded. Cell shorting amplitude and survival rate were detected in isolated cardiomyocytes. RESULTS The application of ketamine and pentobarbital sodium led to a significant decrease in HR, LVSP and +dp/dt in isolated hearts. Furthermore, pentobarbital sodium inhibited cell shorting amplitude and reduced the survival rate of isolated cardiomyocytes. Chloral hydrate did not significantly alter HR, LVSP, +dp/dt, cell shorting amplitude and survival rate. CONCLUSION The effects of anesthetics on cardiac parameters were considered when choosing an anesthesia administration. The results suggested that chloral hydrate as an anesthetic was appropriately applied for the studies of isolated hearts and cardiomyocytes.
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Affiliation(s)
- Xinwei Jiang
- Department of Physiology, Xuzhou Medical College, Xuzhou, China
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Curl CL, Bell JR, Delbridge LM. ‘Gain’-ful insight into the cardiomyocyte Ca2+ seX factor. J Mol Cell Cardiol 2012; 52:7-9. [DOI: 10.1016/j.yjmcc.2011.10.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 10/07/2011] [Indexed: 10/16/2022]
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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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Fares E, Parks RJ, MacDonald JK, Egar JM, Howlett SE. Ovariectomy enhances SR Ca2+ release and increases Ca2+ spark amplitudes in isolated ventricular myocytes. J Mol Cell Cardiol 2012; 52:32-42. [DOI: 10.1016/j.yjmcc.2011.09.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 08/18/2011] [Accepted: 09/02/2011] [Indexed: 11/24/2022]
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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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Qi L, Pan H, Li D, Fang F, Chen D, Sun H. Luteolin improves contractile function and attenuates apoptosis following ischemia-reperfusion in adult rat cardiomyocytes. Eur J Pharmacol 2011; 668:201-7. [PMID: 21723277 DOI: 10.1016/j.ejphar.2011.06.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 06/01/2011] [Accepted: 06/14/2011] [Indexed: 01/17/2023]
Abstract
Luteolin occurs in a variety of plants and possesses antioxidant and anti-inflammatory properties. However, its role in protection against ischemia-reperfusion injury in Sprague-Dawley rats has not been elucidated. In the present study, we tested the contractile function of left ventricular cardiomyocytes with different concentrations of luteolin: 0.5, 1.5, 2.5 and 5.0 μg/ml after simulated. We investigated the direct effect of luteolin against necrosis and apoptosis following ischemia-reperfusion in cardiomyocytes. We further observed the function of isolated hearts subjected to ischemia-reperfusion with or without 10.0 μg/ml luteolin pretreatment. Following 24h incubation with or without luteolin, adult rat cardiomyocytes were subjected to 3h of ischemia followed by 2h of reperfusion for contractile function and necrosis (trypan blue exclusion and lactate dehydrogenase release) or 18 h of reperfusion for apoptosis studies. The cardiomyocyte shortening amplitude depended on different concentrations of luteolin, increasing significantly at 2.5 μg/ml luteolin (P<0.01). Necrosis and apoptosis were reduced by luteolin at 2.5 μg/ml. In addition, the expression of Bcl-2 was upregulated by luteolin and the ratio of Bax to Bcl-2 was decreased. Luteolin inhibited the activation of Caspase3 after ischemia-reperfusion in cardiomyocytes. Furthermore, luteolin at 10.0 μg/ml improved ischemia-reperfusion induced myocardial function, by improving heart rate, +dp/dt(max) and -dp/dt(max), and also limiting the decline of left ventricular systolic pressure (LVSP) and elevation of left ventricular end-diastolic pressure (LVEDP) to some extent. Our results demonstrated that luteolin prevents ischemia-reperfusion injury by reducing necrosis and apoptosis in rat cardiomyocytes.
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Affiliation(s)
- Lingling Qi
- Institute of Cardiovascular Disease Research, Xuzhou Medical College Affiliated Hospital, China
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McIntosh VJ, Chandrasekera PC, Lasley RD. Sex differences and the effects of ovariectomy on the β-adrenergic contractile response. Am J Physiol Heart Circ Physiol 2011; 301:H1127-34. [PMID: 21685268 DOI: 10.1152/ajpheart.00711.2010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The presence of sex differences in myocardial β-adrenergic responsiveness is controversial, and limited studies have addressed the mechanism underlying these differences. Studies were performed using isolated perfused hearts from male, intact female and ovariectomized female mice to investigate sex differences and the effects of ovarian hormone withdrawal on β-adrenergic receptor function. Female hearts exhibited blunted contractile responses to the β-adrenergic receptor agonist isoproterenol (ISO) compared with males but not ovariectomized females. There were no sex differences in β(1)-adrenergic receptor gene or protein expression. To investigate the role of adenylyl cyclase, phosphodiesterase, and the cAMP-signaling cascade in generating sex differences in the β-adrenergic contractile response, dose-response studies were performed in isolated perfused male and female hearts using forskolin, 3-isobutyl-1-methylxanthine (IBMX), and 8-(4-chlorophenylthio)adenosine 3',5'-cyclic monophosphate (CPT-cAMP). Males showed a modestly enhanced contractile response to forskolin at 300 nM and 5 μM compared with females, but there were no sex differences in the response to IBMX or CPT-cAMP. The role of the A(1) adenosine receptor (A(1)AR) in antagonizing the β-adrenergic contractile response was investigated using both the A(1)AR agonist 2-chloro-N(6)-cyclopentyl-adenosine and A(1)AR knockout (KO) mice. Intact females showed an enhanced A(1)AR anti-adrenergic effect compared with males and ovariectomized females. The β-adrenergic contractile response was potentiated in both male and female A(1)ARKO hearts, with sex differences no longer present above 1 nM ISO. The β-adrenergic contractile response is greater in male hearts than females, and minor differences in the action of adenylyl cyclase or the A(1)AR may contribute to these sex differences.
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Affiliation(s)
- Victoria J McIntosh
- Department of Physiology and the Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, Michigan, USA
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Fang F, Li D, Pan H, Chen D, Qi L, Zhang R, Sun H. Luteolin Inhibits Apoptosis and Improves Cardiomyocyte Contractile Function through the PI3K/Akt Pathway in Simulated Ischemia/Reperfusion. Pharmacology 2011; 88:149-58. [DOI: 10.1159/000330068] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Accepted: 05/23/2011] [Indexed: 11/19/2022]
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Xu C, Liu A, Sun H, Sun Y, Wang G, Gao L, Hao Y, Yan C. beta2-Adrenoceptor confers cardioprotection against hypoxia in isolated ventricular myocytes and the effects depend on estrogenic environment. J Recept Signal Transduct Res 2010; 30:255-61. [PMID: 20602544 DOI: 10.3109/10799893.2010.488242] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Estrogen plays a cardioprotective role in female rat hearts subjected to ischemia/reperfusion injury. The its effects are, at least partially, associated with decreased cardiomyocyte contraction and increased expression of beta(2)-adrenoceptor (beta(2)-AR). We tested whether beta(2)-AR could be involved in cardioprotection against ischemic damage and whether the roles of beta(2)-AR were dependent on estrogenic environment. We first determined the effects of hypoxia/reoxygenation (H/R) on cardiomyocyte shortening in female rats. We then determined the roles of beta(2)-AR in cardiomyocyte shortening, lactate dehydrogenase (LDH) release in culture medium, and cell death during hypoxia in isolated myocytes from female rats. We further determined the effects of estrogen on the roles of beta(2)-AR during hypoxia. H/R induced short-term hibernation and stunning at the level of ventricular myocytes from normal female rats. Inhibition of beta(2)-AR with ICI118,551 significantly elevated adrenergic contractile reserve, myocardial injury, and cell death in normal female rats during hypoxia, whereas ovariectomy (OVX) prominently enhanced myocyte contraction, myocardial injury, and cell death, and deprived the alternations in normal female rats. These changes were restored to normal by estrogen replacement (OVX+E(2)). These data suggest that beta(2)-AR may be involved in the cardioprotection against ischemic damage, and the cardioprotection may depend on estrogenic environment.
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Affiliation(s)
- Chuanying Xu
- Department of Physiology, Xuzhou Medical College, Xuzhou, China
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Liu MJ, Fei SJ, Qiao WL, Du DS, Zhang YM, Li Y, Zhang JF. The protective effect of 17beta-estradiol postconditioning against hypoxia/reoxygenation injury in human gastric epithelial cells. Eur J Pharmacol 2010; 645:151-7. [PMID: 20654613 DOI: 10.1016/j.ejphar.2010.06.060] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 06/09/2010] [Accepted: 06/24/2010] [Indexed: 11/16/2022]
Abstract
The purpose of this study was to investigate the effects and mechanisms of 17beta-estradiol pharmacological postconditioning on gastric epithelial cells hypoxia/reoxygenation injury by using an in vitro model of human gastric epithelial cells. The model of hypoxia/reoxygenation was established with human gastric epithelial cell line. The gastric epithelial cell viability was detected by 3-(4, 5-dimethylthazol-2-yl)-2, 5-diphenyl tetrazolium bromide (MTT) assays. Gastric epithelial cellular apoptosis was determined by Hoechst 33258 fluorochrome staining and flow cytometric analysis. Contents of malondialdehyde (MDA) and the activity of superoxide dismutase (SOD) were measured by Colorimetry analysis. The protein expression of Bcl-2 and Bax in different groups was determined by Western blot analyses and immunocytochemistry assay. 17beta-estradiol (10(-8), 10(-7) and 10(-6)mol/l) inhibited hypoxia/reoxygenation injury and 17beta-estradiol (10(-6)mol/l) obviously attenuated hypoxia/reoxygenation injury 3h hypoxia followed by 4h reoxygenation. 17beta-estradiol promoted gastric epithelial cell viability and inhibited the gastric epithelial cell apoptosis, and meanwhile, decreased the MDA content and increased SOD activity. The level of Bcl-2 protein was restored to the normal level by 17beta-estradiol pharmacological postconditioning. In contrast, the Bax protein level was markedly reduced by 17beta-estradiol pharmacological postconditioning. These effects of 17beta-estradiol were inhibited by pretreatment with fulvestrant. These data suggested that 17beta-estradiol seems involved in regulation of gastric hypoxia/reoxygenation injury and gastroprotection, and its protective effects were strongly related to estrogen receptor.
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Affiliation(s)
- Mei-Jing Liu
- Department of Physiology, Xuzhou Medical College, 84 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China
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Improvement of Contractile Function in Isolated Cardiomyocytes From Ischemia-Reperfusion Rats by Ginkgolide B Pretreatment. J Cardiovasc Pharmacol 2009; 54:3-9. [DOI: 10.1097/fjc.0b013e3181a91410] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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