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Qi Z, Wang T, Chen X, Wong CK, Ding Q, Sauer H, Chen ZF, Long C, Yao X, Cai Z, Tsang SY. Extracellular and Intracellular Angiotensin II Regulate the Automaticity of Developing Cardiomyocytes via Different Signaling Pathways. Front Mol Biosci 2021; 8:699827. [PMID: 34513920 PMCID: PMC8425478 DOI: 10.3389/fmolb.2021.699827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 07/27/2021] [Indexed: 12/02/2022] Open
Abstract
Angiotensin II (Ang II) plays an important role in regulating various physiological processes. However, little is known about the existence of intracellular Ang II (iAng II), whether iAng II would regulate the automaticity of early differentiating cardiomyocytes, and the underlying mechanism involved. Here, iAng II was detected by immunocytochemistry and ultra-high performance liquid chromatography combined with electrospray ionization triple quadrupole tandem mass spectrometry in mouse embryonic stem cell–derived cardiomyocytes (mESC-CMs) and neonatal rat ventricular myocytes. Expression of AT1R-YFP in mESC-CMs revealed that Ang II type 1 receptors were located on the surface membrane, while immunostaining of Ang II type 2 receptors (AT2R) revealed that AT2R were predominately located on the nucleus and the sarcoplasmic reticulum. While extracellular Ang II increased spontaneous action potentials (APs), dual patch clamping revealed that intracellular delivery of Ang II or AT2R activator C21 decreased spontaneous APs. Interestingly, iAng II was found to decrease the caffeine-induced increase in spontaneous APs and caffeine-induced calcium release, suggesting that iAng II decreased spontaneous APs via the AT2R- and ryanodine receptor–mediated pathways. This is the first study that provides evidence of the presence and function of iAng II in regulating the automaticity behavior of ESC-CMs and may therefore shed light on the role of iAng II in fate determination.
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Affiliation(s)
- Zenghua Qi
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China
| | - Tao Wang
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, SAR China
| | - Xiangmao Chen
- School of Life Sciences, South China Normal University, Guangzhou, China
| | - Chun Kit Wong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Qianqian Ding
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Heinrich Sauer
- Department of Physiology, Justus Liebig University Giessen, Giessen, Germany
| | - Zhi-Feng Chen
- Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China
| | - Cheng Long
- School of Life Sciences, South China Normal University, Guangzhou, China
| | - Xiaoqiang Yao
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Zongwei Cai
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, SAR China
| | - Suk Ying Tsang
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Key Laboratory for Regenerative Medicine, Ministry of Education, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
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Li T, Zhang X, Cheng HJ, Zhang Z, Ahmad S, Varagic J, Li W, Cheng CP, Ferrario CM. Critical role of the chymase/angiotensin-(1-12) axis in modulating cardiomyocyte contractility. Int J Cardiol 2018; 264:137-144. [PMID: 29685688 DOI: 10.1016/j.ijcard.2018.03.066] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 02/23/2018] [Accepted: 03/13/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND Angiotensin-(1-12) [Ang-(1-12)] is a chymase-dependent source for angiotensin II (Ang II) cardiac activity. The direct contractile effects of Ang-(1-12) in normal and heart failure (HF) remain to be demonstrated. We assessed the hypothesis that Ang-(1-12) may modulate [Ca2+]i regulation and alter cardiomyocyte contractility in normal and HF rats. METHODS AND RESULTS We compared left ventricle (LV) myocyte contractile and calcium transient ([Ca2+]iT) responses to angiotensin peptides in 16 SD rats with isoproterenol-induced HF and 16 age-matched controls. In normal myocytes, versus baseline, Ang II (10-6 M) superfusion significantly increased myocyte contractility (dL/dtmax: 40%) and [Ca2+]iT (29%). Ang-(1-12) (4 × 10-6 M) caused similar increases in dL/dtmax (34%) and [Ca2+]iT (25%). Compared with normal myocytes, superfusion of Ang II and Ang-(1-12) in myocytes obtained from rats with isoproterenol-induced HF caused similar but significantly attenuated positive inotropic actions with about 42% to 50% less increases in dL/dtmax and [Ca2+]iT. Chymostatin abolished Ang-(1-12)-mediated effects in normal and HF myocytes. The presence of an inhibitory cAMP analog, Rp-cAMPS prevented Ang-(1-12)-induced inotropic effects in both normal and HF myocytes. Incubation of HF myocytes with pertussis toxin (PTX) further augmented Ang II-mediated contractility. CONCLUSIONS Ang-(1-12) stimulates cardiomyocyte contractile function and [Ca2+]iT in both normal and HF rats through a chymase mediated action. Altered inotropic responses to Ang-(1-12) and Ang II in HF myocytes are mediated through a cAMP-dependent mechanism that is coupled to both stimulatory G and inhibitory PTX-sensitive G proteins.
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Affiliation(s)
- Tiankai Li
- Department of Cardiology, the First Affiliated Hospital of Harbin Medical University, Harbin, China; Department of Internal Medicine, Section on Cardiovascular Medicine, Wake Forest School of Medicine, Winston Salem, NC, United States
| | - Xiaowei Zhang
- Department of Internal Medicine, Section on Cardiovascular Medicine, Wake Forest School of Medicine, Winston Salem, NC, United States; Department of Cardiology, the Second Affiliated Hospital of Nantong University, Nantong, China
| | - Heng-Jie Cheng
- Department of Cardiology, the First Affiliated Hospital of Harbin Medical University, Harbin, China; Department of Internal Medicine, Section on Cardiovascular Medicine, Wake Forest School of Medicine, Winston Salem, NC, United States
| | - Zhi Zhang
- Department of Internal Medicine, Section on Cardiovascular Medicine, Wake Forest School of Medicine, Winston Salem, NC, United States; Cardiovascular Department, Shanghai First People's Hospital Affiliated to Shanghai Jiao Tong University, Shanghai, China
| | - Sarfaraz Ahmad
- Departments of Surgery, Internal Medicine-Nephrology, and Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Jasmina Varagic
- Departments of Surgery, Internal Medicine-Nephrology, and Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Weimin Li
- Department of Cardiology, the First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Che Ping Cheng
- Department of Cardiology, the First Affiliated Hospital of Harbin Medical University, Harbin, China; Department of Internal Medicine, Section on Cardiovascular Medicine, Wake Forest School of Medicine, Winston Salem, NC, United States.
| | - Carlos M Ferrario
- Departments of Surgery, Internal Medicine-Nephrology, and Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC, United States
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Zhang W, Liu Z, Zhang Y, Bao Q, Wu W, Huang H, Liu X. Silencing calreticulin gene might protect cardiomyocytes from angiotensin II-induced apoptosis. Life Sci 2018; 198:119-127. [PMID: 29453988 DOI: 10.1016/j.lfs.2018.02.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Revised: 02/10/2018] [Accepted: 02/13/2018] [Indexed: 02/05/2023]
Abstract
AIMS Calreticulin (CRT), as a chaperone, contributes to protein folding and quality control cycle. CRT is an important factor regulating Ca2+ that participates in cell apoptosis. However, the function of CRT in the heart is still controversial. Therefore, we aimed to investigate the potential role of CRT in angiotensin II-induced cardiomyocytes apoptosis. MAIN METHODS Primary cultured neonatal cardiomyocytes were stimulated with angiotensin II to induce the apoptosis. Expression of CRT and endoplasmic reticulum (ER) stress associated protein was detected by western blotting after angiotensin II stimulation for 24 h. The reactive oxygen species (ROS) production and mitochondrial membrane potential (MMP) were also detected. Additionally, the function of CRT on cardiomyocytes apoptosis and ER stress/unfolded protein response signaling pathway was investigated by transfecting specific CRT-targeting siRNA. KEY FINDINGS Cardiomyocytes apoptosis was induced by angiotensin II. The protein level of CRT was elevated after angiotensin -II stimulation for 24 h. Additionally, the protein levels of GRP78, ATF4, C-ATF6, CHOP and the ROS production were elevated, but the Bcl-2 expression and the level of MMP were down-regulated. After silencing CRT gene in the process of angiotensin II-induced cardiomyocytes apoptosis, cardiomyocytes apoptosis rate decreased, meanwhile the protein expression of CRT, GRP78, ATF4, C-ATF6 and CHOP were down-regulated. However, the Bcl-2 expression was up-regulated, and the increase of ROS and the loss of MMP were alleviated. SIGNIFICANCE Our study demonstrated that CRT might protect cardiomyocytes from apoptosis induced by angiotensin II, in which ER stress and mitochondria function were identified as possible underlying molecular bases.
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Affiliation(s)
- Wen Zhang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan 61004, China
| | - Zhiyue Liu
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan 61004, China
| | - Yanmei Zhang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan 61004, China
| | - Qinxue Bao
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan 61004, China
| | - Wenchao Wu
- Laboratory of Cardiovascular Diseases, Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - He Huang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan 61004, China..
| | - Xiaojing Liu
- Laboratory of Cardiovascular Diseases, Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China..
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Pan W. Festschrift to highlight the career of Abba J. Kastin as a founding editor, researcher, and educator in the peptide field. Preface. Peptides 2015; 72:1-3. [PMID: 26275336 DOI: 10.1016/j.peptides.2015.08.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Weihong Pan
- Biopotentials Sleep Center, Baton Rouge, LA 70809, USA.
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De Mello WC. Aldosterone Disrupts the Intercellular Flow of Glucose in Cardiac Muscle. Front Endocrinol (Lausanne) 2015; 6:185. [PMID: 26696961 PMCID: PMC4675854 DOI: 10.3389/fendo.2015.00185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 11/27/2015] [Indexed: 01/14/2023] Open
Abstract
The activation of the renin-angiotensin system is known to impair intercellular communication in the heart, but the role of aldosterone on the process of chemical communication and particularly the intercellular diffusion of glucose between cardiomyocytes is not known. This problem was investigated in cell pairs isolated from the left ventricle of adult Wistar Kyoto rats. For this, fluorescent glucose was dialyzed into one cell of the pair using the whole cell clamp technique, and its diffusion from cell-to-cell through gap junctions was followed by measuring the fluorescence intensity in the dialyzed as well as in non-dialyzed cell as a function of time. The results indicated that (1) in cell pairs exposed to aldosterone (100 nM) for 24 h, the intercellular flow of glucose through gap junctions was disrupted; (2) although the mechanism by which aldosterone disrupts the cell-to-cell flow of glucose is multifactorial, two major factors are involved: oxidative stress and PKC activation; (3) the effect of aldosterone was significantly reduced by spironolactone (100 nM); and (4) calculation of gap junction permeability (Pj) indicated an average values of 0.3 ± 0.001 × 10(-4) cm/s (n = 31) (four animals) for controls and 24 ± 0.03 × 10(-6) cm/s (n = 34) (four animals) (P < 0.05) for cell pairs exposed to aldosterone (100 nM) for 24 h. Bis-1 (10(-9)M), which is a selective PKC inhibitor, added to the aldosterone solution, improved the value of Pj to 0.21 ± 0.001 × 10(-4) cm/s (n = 24) (P < 0.05), whereas spironolactone (100 nM) added to aldosterone solution, reduced significantly the effect of the hormone on junctional permeability to glucose.
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Affiliation(s)
- Walmor C. De Mello
- School of Medicine, University of Puerto Rico, San Juan, PR, USA
- *Correspondence: Walmor C. De Mello,
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