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Zhang J, Yin Z, Yu L, Wang Z, Liu Y, Huang X, Wan S, Lan HY, Wang H. Macrophage Rmp Ameliorates Myocardial Infarction by Modulating Macrophage Polarization in Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:6248779. [PMID: 36092156 PMCID: PMC9459438 DOI: 10.1155/2022/6248779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/01/2022] [Accepted: 08/12/2022] [Indexed: 11/28/2022]
Abstract
Background Inflammation plays important roles during myocardial infarction (MI). Macrophage polarization is a major factor that drives the inflammatory process. Our previous study found that RNA polymerase II subunit 5-mediating protein (RMP) knockout in cardiomyocytes caused heart failure by impairing mitochondrial structure and function. However, whether macrophage RMP plays a role in MI has not been investigated. Methods Macrophage RMP-knockout in combination with a mouse model of MI was used to study the function of macrophage RMP in MI. Next, we modified bone marrow-derived macrophages (BMDMs) by plasmid transfection, and the BMDMs were administered to LysM-Cre/DTR mice by tail vein injection. Immunoblotting and immunofluorescence were used to detect macrophage polarization, fibrosis, angiogenesis, and the p38 signaling pathway in each group. Results Macrophage RMP deficiency aggravates cardiac dysfunction, promotes M1 polarization, and inhibits angiogenesis after MI. However, RMP overexpression in macrophages promotes M2 polarization and angiogenesis after MI. Mechanistically, we found that RMP regulates macrophage polarization through the heat shock protein 90- (HSP90-) p38 signaling pathway. Conclusions Macrophage RMP plays a significant role in MI, likely by regulating macrophage polarization via the HSP90-p38 signaling pathway.
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Affiliation(s)
- Jian Zhang
- Department of Cardiovascular Surgery, General Hospital of Northern Theater Command, No. 83, Wenhua Road, Shenhe District, Shenyang, Liaoning, China
| | - Zongtao Yin
- Department of Cardiovascular Surgery, General Hospital of Northern Theater Command, No. 83, Wenhua Road, Shenhe District, Shenyang, Liaoning, China
| | - Liming Yu
- Department of Cardiovascular Surgery, General Hospital of Northern Theater Command, No. 83, Wenhua Road, Shenhe District, Shenyang, Liaoning, China
| | - Zhishang Wang
- Department of Cardiovascular Surgery, General Hospital of Northern Theater Command, No. 83, Wenhua Road, Shenhe District, Shenyang, Liaoning, China
| | - Yu Liu
- Department of Cardiovascular Surgery, General Hospital of Northern Theater Command, No. 83, Wenhua Road, Shenhe District, Shenyang, Liaoning, China
| | - Xiaoru Huang
- Department of Medicine & Therapeutics, and Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Song Wan
- Division of Cardiothoracic Surgery, Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT, Hong Kong
| | - Hui-yao Lan
- Department of Medicine & Therapeutics, and Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Huishan Wang
- Department of Cardiovascular Surgery, General Hospital of Northern Theater Command, No. 83, Wenhua Road, Shenhe District, Shenyang, Liaoning, China
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Liang Q, Xu H, Liu M, Qian L, Yan J, Yang G, Chen L. Postnatal Deletion of Bmal1 in Cardiomyocyte Promotes Pressure Overload Induced Cardiac Remodeling in Mice. J Am Heart Assoc 2022; 11:e025021. [PMID: 35730615 PMCID: PMC9333388 DOI: 10.1161/jaha.121.025021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 04/29/2022] [Indexed: 11/16/2022]
Abstract
Background Mice with cardiomyocyte-specific deletion of Bmal1, a core clock gene, had spontaneous abnormal cardiac metabolism, dilated cardiomyopathy, and shortened lifespan. However, the role of cardiomyocyte Bmal1 in pressure overload induced cardiac remodeling is unknown. Here we aimed to understand the contribution of cardiomyocyte Bmal1 to cardiac remodeling in response to pressure overload induced by transverse aortic constriction or chronic angiotensin Ⅱ (AngⅡ) infusion. Methods and Results By generating a tamoxifen-inducible cardiomyocyte-specific Bmal1 knockout mouse line (cKO) and challenging the mice with transverse aortic constriction or AngⅡ, we found that compared to littermate controls, the cKO mice displayed remarkably increased cardiac hypertrophy and augmented fibrosis both after transverse aortic constriction and AngⅡ induction, as assessed by echocardiographic, gravimetric, histologic, and molecular analyses. Mechanistically, RNA-sequencing analysis of the heart after transverse aortic constriction exposure revealed that the PI3K/AKT signaling pathway was significantly activated in the cKOs. Consistent with the in vivo findings, in vitro study showed that knockdown of Bmal1 in cardiomyocytes significantly promoted phenylephrine-induced cardiomyocyte hypertrophy and triggered fibroblast-to-myofibroblast differentiation, while inhibition of AKT remarkedly reversed the pro-hypertrophy and pro-fibrosis effects of Bmal1 knocking down. Conclusions These results suggest that postnatal deletion of Bmal1 in cardiomyocytes may promote pressure overload-induced cardiac remodeling. Moreover, we identified PI3K/AKT signaling pathway as the potential mechanistic ties between Bmal1 and cardiac remodeling.
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Affiliation(s)
- Qing Liang
- Advanced Institute for Medical SciencesDalian Medical UniversityDalianChina
| | - Hu Xu
- Advanced Institute for Medical SciencesDalian Medical UniversityDalianChina
| | - Min Liu
- Advanced Institute for Medical SciencesDalian Medical UniversityDalianChina
| | - Lei Qian
- Advanced Institute for Medical SciencesDalian Medical UniversityDalianChina
| | - Jin Yan
- Advanced Institute for Medical SciencesDalian Medical UniversityDalianChina
| | - Guangrui Yang
- School of BioengineeringDalian University of TechnologyDalianChina
| | - Lihong Chen
- Advanced Institute for Medical SciencesDalian Medical UniversityDalianChina
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Li C, Peng H, Kang YJ. Cardiomyocyte-Specific COMMD1 Deletion Suppresses Ischemia-Induced Myocardial Apoptosis. Cardiovasc Toxicol 2021; 21:572-581. [PMID: 33900545 DOI: 10.1007/s12012-021-09650-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/07/2021] [Indexed: 02/05/2023]
Abstract
Copper metabolism MURR domain 1 (COMMD1) increases in ischemic myocardium along with suppressed contractility. Cardiomyocyte-specific deletion of COMMD1 preserved myocardial contractile function in response to the same ischemic insult. This study was undertaken to test the hypothesis that cardiomyocyte protection in COMMD1 myocardium is responsible for the functional preservation of the heart in response to ischemic insult. After ischemic insult, there were significantly more cardiomyocytes in the cardiomyocyte-specific COMMD1 deletion myocardium than that in WT controls. This preservation of cardiomyocytes was paralleled by a significant suppression of apoptosis in the COMMD1 deletion myocardium compared to controls. In searching for the mechanistic understanding of the anti-apoptotic effect of COMMD1 deletion, we found the anti-apoptotic Bcl-2 mRNA and protein expression were upregulated and the pro-apoptotic Bax mRNA and protein expression were downregulated. The critical transcription factor RelA, maintaining a high ratio between Bcl-2 and Bax for anti-apoptotic action, was suppressed by ischemia, but was rescued in the COMMD1 deletion myocardium. Because COMMD1 is critically involved in RelA ubiquitination and degradation, the data obtained here demonstrate that COMMD1 deletion leads to RelA preservation in ischemic myocardium, promoting the Bcl-2 anti-apoptotic pathway and suppressing the Bax pro-apoptotic pathway, and in combination, leading to protection of cardiomyocytes from ischemia-induced apoptosis.
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Affiliation(s)
- Chen Li
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Hongxu Peng
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Y James Kang
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, 610041, China.
- Memphis Institute of Regenerative Medicine, University of Tennessee Health Science Center, Memphis, TN, 38163, USA.
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Chen Q, Chen L, Jian J, Li J, Zhang X. The mechanism of BAF60c in myocardial metabolism through the PGC1α/PPARα/mTOR signaling pathway in rats with heart failure. Biochem Cell Biol 2020; 100:93-103. [PMID: 33245682 DOI: 10.1139/bcb-2019-0450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BRM-associated factor (BAF) 60c promotes muscle glycolysis and improves glucose homeostasis. This study explored the mechanism of BAF60c in heart failure (HF). Fetal/adult rat models of HF were established, and the levels of cardiac contractile proteins and energy metabolism-, oxidative metabolism- and glycolysis-related factors were detected. Overexpression/siRNA BAF60c plasmids were injected into adult HF rats to estimate myocardial glucose uptake, high-energy phosphate contents, mitochondrial function, and cell proliferation and apoptosis. The overexpression/siRNA BAF60c plasmids were transfected into cardiac hypertrophic H9C2 cells to explore the in vitro effects. The interaction of BAF60c and PGC1α was detected. The results suggested that adult HF rats presented increased levels of fetal proteins (ssTnI and fTnT), BAF60c and glycolysis-related factors, and reduced levels of cardiac contractile proteins, PGC1α, PPARα, and oxidative metabolism-related factors. BAF60c knockdown improved glucose uptake, maintained the oxidative metabolism/glycolysis balance, promoted H9C2 cell proliferation, and inhibited apoptosis. PGC1α interacted with BAF60c. Knocking down BAF60c also activated the PGC1α/PPARα/mTOR pathway. Overexpression of PGC1α decreased the damage to H9C2 cells caused by BAF60c. Altogether, BAF60c downregulation activated the PGC1α/PPARα/mTOR pathway, maintained the oxidative metabolism/glycolysis balance and improved mitochondrial function in rat models of HF. This study may offer novel insights into HF treatment.
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Affiliation(s)
- Qiang Chen
- The First Affiliated Hospital of Baotou Medical College, Inner Mongolia Baotou Medical University, Department of Cardiology, The First Affiliated Hospital of Baotou Medical College, Inner Mongolia Baotou Medical University, Baotou, China, 014010;
| | - Lizhu Chen
- The First Affiliated Hospital of Baotou Medical College, Inner Mongolia Baotou Medical University, Baotou, China;
| | - Jianguo Jian
- The First Affiliated Hospital of Baotou Medical College, Inner Mongolia Baotou Medical University, Department of Cardiology, Baotou, China;
| | - Junping Li
- The First Affiliated Hospital of Baotou Medical College, Inner Mongolia Baotou Medical University, Department of Cardiology, Baotou, China;
| | - Xiaomiao Zhang
- The First Affiliated Hospital of Baotou Medical College, Inner Mongolia Baotou Medical University, Baotou, China;
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