1
|
Ignacio A, Cipelli M, Takiishi T, Favero Aguiar C, Fernandes Terra F, Ghirotto B, Martins Silva E, Castoldi A, Magalhães YT, Antonio T, Nunes Padovani B, Ioshie Hiyane M, Andrade-Oliveira V, Forti FL, Olsen Saraiva Camara N. Lack of mTORC2 signaling in CD11c+ myeloid cells inhibits their migration and ameliorates experimental colitis. J Leukoc Biol 2024; 116:779-792. [PMID: 38652699 DOI: 10.1093/jleuko/qiae084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 01/30/2024] [Accepted: 03/05/2024] [Indexed: 04/25/2024] Open
Abstract
The mammalian target of rapamycin (mTOR) pathway plays a key role in determining immune cells function through modulation of their metabolic status. By specific deletion of Rictor in CD11c+ myeloid cells (referred to here as CD11cRicΔ/Δ), we investigated the role of mTOR complex 2 (mTORC2) signaling in dendritic cells (DCs) function in mice. We showed that upon dextran sulfate sodium-induced colitis, the lack of mTORC2 signaling CD11c+ cells diminishes the colitis score and abrogates DC migration to the mesenteric lymph nodes, thereby diminishing the infiltration of T helper 17 cells in the lamina propria and subsequent inflammation. These findings corroborate with the abrogation of cytoskeleton organization and the decreased activation of Rac1 and Cdc42 GTPases observed in CD11c+-mTORC2-deficient cells. Meta-analysis on colonic samples from ulcerative colitis patients revealed increased gene expression of proinflammatory cytokines, which coincided with augmented expression of the mTOR pathway, a positive correlation between the DC marker ITGAX and interleukin-6, the expression of RICTOR, and CDC42. Together, this work proposes that targeting mTORC2 on DCs offers a key to hamper inflammatory responses, and this way, ameliorates the progression and severity of intestinal inflammatory diseases.
Collapse
Affiliation(s)
- Aline Ignacio
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Marcella Cipelli
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Tatiane Takiishi
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Cristhiane Favero Aguiar
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Fernanda Fernandes Terra
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Bruno Ghirotto
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Eloisa Martins Silva
- Center for Natural and Human Sciences, Federal University of ABC. Alameda da Universidade (UFABC) 09606045, São Bernardo do Campo, SP, Brazil
| | - Angela Castoldi
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Yuli Thamires Magalhães
- Laboratory of Signaling in Biomolecular Systems, Department of Biochemistry, Institute of Chemistry, University of São Paulo. Av. Prof. Lineu Prestes, 748 05508900, São Paulo, Brazil
| | - Tiago Antonio
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Barbara Nunes Padovani
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Meire Ioshie Hiyane
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Vinicius Andrade-Oliveira
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
| | - Fabio Luis Forti
- Laboratory of Signaling in Biomolecular Systems, Department of Biochemistry, Institute of Chemistry, University of São Paulo. Av. Prof. Lineu Prestes, 748 05508900, São Paulo, Brazil
| | - Niels Olsen Saraiva Camara
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo. Av. Prof. Lineu Prestes 1730, ICB IV, 05508000 São Paulo, Brazil
- Laboratory of Renal Physiology, Department of Medicine, Federal University of São Paulo (UNIFESP). Rua Botucatu 740, 04023-062, São Paulo, Brazil
| |
Collapse
|
2
|
Xie B, Li J, Lou Y, Chen Q, Yang Y, Zhang R, Liu Z, He L, Cheng Y. Reprogramming macrophage metabolism following myocardial infarction: A neglected piece of a therapeutic opportunity. Int Immunopharmacol 2024; 142:113019. [PMID: 39217876 DOI: 10.1016/j.intimp.2024.113019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 08/15/2024] [Accepted: 08/22/2024] [Indexed: 09/04/2024]
Abstract
Given the global prevalence of myocardial infarction (MI) as the leading cause of mortality, there is an urgent need to devise novel strategies that target reducing infarct size, accelerating cardiac tissue repair, and preventing detrimental left ventricular (LV) remodeling. Macrophages, as a predominant type of innate immune cells, undergo metabolic reprogramming following MI, resulting in alterations in function and phenotype that significantly impact the progression of MI size and LV remodeling. This article aimed to delineate the characteristics of macrophage metabolites during reprogramming in MI and elucidate their targets and functions in cardioprotection. Furthermore, we summarize the currently proposed regulatory mechanisms of macrophage metabolic reprogramming and identify the regulators derived from endogenous products and natural small molecules. Finally, we discussed the challenges of macrophage metabolic reprogramming in the treatment of MI, with the goal of inspiring further fundamental and clinical research into reprogramming macrophage metabolism and validating its potential therapeutic targets for MI.
Collapse
Affiliation(s)
- Baoping Xie
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China; Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Jiangxi Provincial Key Laboratory of Tissue Engineering, Gannan Medical University, Ganzhou 341000, China
| | - Jiahua Li
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China
| | - Yanmei Lou
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China
| | - Qi Chen
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China
| | - Ying Yang
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China
| | - Rong Zhang
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China
| | - Zhongqiu Liu
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China.
| | - Liu He
- Department of Endocrinology, Guangdong Provincial Hospital of Chinese Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangdong 510006, China.
| | - Yuanyuan Cheng
- State Key Laboratory of Traditional Chinese Medicine Syndrome, Key Laboratory for Translational Cancer Research of Chinese Medicine, Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China, International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, China; Chinese Medicine Guangdong Laboratory, Guangdong, Hengqin, China.
| |
Collapse
|
3
|
Zeng W, Li F, Jin S, Ho PC, Liu PS, Xie X. Functional polarization of tumor-associated macrophages dictated by metabolic reprogramming. J Exp Clin Cancer Res 2023; 42:245. [PMID: 37740232 PMCID: PMC10517486 DOI: 10.1186/s13046-023-02832-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 09/12/2023] [Indexed: 09/24/2023] Open
Abstract
Macrophages are highly plastic in different tissues and can differentiate into functional subpopulations under different stimuli. Tumor-associated macrophages (TAMs) are one of the most important innate immune cells implicated in the establishment of an immunosuppressive tumor microenvironment (TME). Recent evidence pinpoints the critical role of metabolic reprogramming in dictating pro-tumorigenic functions of TAMs. Both tumor cells and macrophages undergo metabolic reprogramming to meet energy demands in the TME. Understanding the metabolic rewiring in TAMs can shed light on immune escape mechanisms and provide insights into repolarizing TAMs towards anti-tumorigenic function. Here, we discuss how metabolism impinges on the functional divergence of macrophages and its relevance to macrophage polarization in the TME.
Collapse
Affiliation(s)
- Wentao Zeng
- School of Life and Environmental Sciences, Shaoxing University, Shaoxing, 312000, Zhejiang, China
| | - Fei Li
- School of Life and Environmental Sciences, Shaoxing University, Shaoxing, 312000, Zhejiang, China
| | - Shikai Jin
- School of Life and Environmental Sciences, Shaoxing University, Shaoxing, 312000, Zhejiang, China
| | - Ping-Chih Ho
- Department of Fundamental Oncology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
- Ludwig Lausanne Branch, Lausanne, Switzerland
| | - Pu-Ste Liu
- Institute of Cellular and System Medicine, National Health Research Institute, Miaoli, Taiwan, ROC
| | - Xin Xie
- School of Life and Environmental Sciences, Shaoxing University, Shaoxing, 312000, Zhejiang, China.
| |
Collapse
|
4
|
Du Y, Cai X. Therapeutic potential of natural compounds from herbs and nutraceuticals in spinal cord injury: Regulation of the mTOR signaling pathway. Biomed Pharmacother 2023; 163:114905. [PMID: 37207430 DOI: 10.1016/j.biopha.2023.114905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/13/2023] [Accepted: 05/16/2023] [Indexed: 05/21/2023] Open
Abstract
Spinal cord injury (SCI) is a disease in which the spinal cord is subjected to various external forces that cause it to burst, shift, or, in severe cases, injure the spinal tissue, resulting in nerve injury. SCI includes not only acute primary injury but also delayed and persistent spinal tissue injury (i.e., secondary injury). The pathological changes post-SCI are complex, and effective clinical treatment strategies are lacking. The mammalian target of rapamycin (mTOR) coordinates the growth and metabolism of eukaryotic cells in response to various nutrients and growth factors. The mTOR signaling pathway has multiple roles in the pathogenesis of SCI. There is evidence for the beneficial effects of natural compounds and nutraceuticals that regulate the mTOR signaling pathways in a variety of diseases. Therefore, the effects of natural compounds on the pathogenesis of SCI were evaluated by a comprehensive review using electronic databases, such as PubMed, Web of Science, Scopus, and Medline, combined with our expertise in neuropathology. In particular, we reviewed the pathogenesis of SCI, including the importance of secondary nerve injury after the primary mechanical injury, the roles of the mTOR signaling pathways, and the beneficial effects and mechanisms of natural compounds that regulate the mTOR signaling pathway on pathological changes post-SCI, including effects on inflammation, neuronal apoptosis, autophagy, nerve regeneration, and other pathways. This recent research highlights the value of natural compounds in regulating the mTOR pathway, providing a basis for developing novel therapeutic strategies for SCI.
Collapse
Affiliation(s)
- Yan Du
- Department of Emergency Medicine, Shengjing Hospital of China Medical University, Shenyang, Liaoning, PR China
| | - Xue Cai
- Department of Emergency Medicine, Shengjing Hospital of China Medical University, Shenyang, Liaoning, PR China.
| |
Collapse
|
5
|
Chauvin C, Alvarez-Simon D, Radulovic K, Boulard O, Laine W, Delacre M, Waldschmitt N, Segura E, Kluza J, Chamaillard M, Poulin LF. NOD2 in monocytes negatively regulates macrophage development through TNFalpha. Front Immunol 2023; 14:1181823. [PMID: 37415975 PMCID: PMC10320732 DOI: 10.3389/fimmu.2023.1181823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 05/23/2023] [Indexed: 07/08/2023] Open
Abstract
Objective It is believed that intestinal recruitment of monocytes from Crohn's Disease (CD) patients who carry NOD2 risk alleles may repeatedly give rise to recruitment of pathogenic macrophages. We investigated an alternative possibility that NOD2 may rather inhibit their differentiation from intravasating monocytes. Design The monocyte fate decision was examined by using germ-free mice, mixed bone marrow chimeras and a culture system yielding macrophages and monocyte-derived dendritic cells (mo-DCs). Results We observed a decrease in the frequency of mo-DCs in the colon of Nod2-deficient mice, despite a similar abundance of monocytes. This decrease was independent of the changes in the gut microbiota and dysbiosis caused by Nod2 deficiency. Similarly, the pool of mo-DCs was poorly reconstituted in a Nod2-deficient mixed bone marrow (BM) chimera. The use of pharmacological inhibitors revealed that activation of NOD2 during monocyte-derived cell development, dominantly inhibits mTOR-mediated macrophage differentiation in a TNFα-dependent manner. These observations were supported by the identification of a TNFα-dependent response to muramyl dipeptide (MDP) that is specifically lost when CD14-expressing blood cells bear a frameshift mutation in NOD2. Conclusion NOD2 negatively regulates a macrophage developmental program through a feed-forward loop that could be exploited for overcoming resistance to anti-TNF therapy in CD.
Collapse
Affiliation(s)
- Camille Chauvin
- U1019, Institut Pasteur de Lille, Univ. Lille, Centre National de la Recherche Scientifique, Inserm, Centre Hospitalo- Universitaire Lille, Lille, France
- INSERM U1138, Centre de Recherche des Cordeliers, Paris, France
| | - Daniel Alvarez-Simon
- U1019, Institut Pasteur de Lille, Univ. Lille, Centre National de la Recherche Scientifique, Inserm, Centre Hospitalo- Universitaire Lille, Lille, France
| | - Katarina Radulovic
- Unité de Recherche Clinique, Centre Hospitalier de Valenciennes, Valenciennes CEDEX, France
| | | | - William Laine
- UMR9020-U1277 - CANTHER - Cancer Heterogeneity Plasticity and Resistance to Therapies, University Lille, Lille, France
| | - Myriam Delacre
- U1019, Institut Pasteur de Lille, Univ. Lille, Centre National de la Recherche Scientifique, Inserm, Centre Hospitalo- Universitaire Lille, Lille, France
| | - Nadine Waldschmitt
- Chair of Nutrition and Immunology, School of Life Sciences, Technische Universität München, Freising-Weihenstephan, Germany
| | - Elodie Segura
- INSERM U932, Institut Curie, Paris Sciences et Lettres Research University, Paris, France
| | - Jérome Kluza
- UMR9020-U1277 - CANTHER - Cancer Heterogeneity Plasticity and Resistance to Therapies, University Lille, Lille, France
| | | | | |
Collapse
|
6
|
Wu Q, Lv Q, Liu X, Ye X, Cao L, Wang M, Li J, Yang Y, Li L, Wang S. Natural compounds from botanical drugs targeting mTOR signaling pathway as promising therapeutics for atherosclerosis: A review. Front Pharmacol 2023; 14:1083875. [PMID: 36744254 PMCID: PMC9894899 DOI: 10.3389/fphar.2023.1083875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 01/05/2023] [Indexed: 01/22/2023] Open
Abstract
Atherosclerosis (AS) is a chronic inflammatory disease that is a major cause of cardiovascular diseases (CVDs), including coronary artery disease, hypertension, myocardial infarction, and heart failure. Hence, the mechanisms of AS are still being explored. A growing compendium of evidence supports that the activity of the mechanistic/mammalian target of rapamycin (mTOR) is highly correlated with the risk of AS. The mTOR signaling pathway contributes to AS progression by regulating autophagy, cell senescence, immune response, and lipid metabolism. Various botanical drugs and their functional compounds have been found to exert anti- AS effects by modulating the activity of the mTOR signaling pathway. In this review, we summarize the pathogenesis of AS based on the mTOR signaling pathway from the aspects of immune response, autophagy, cell senescence, and lipid metabolism, and comb the recent advances in natural compounds from botanical drugs to inhibit the mTOR signaling pathway and delay AS development. This review will provide a new perspective on the mechanisms and precision treatments of AS.
Collapse
Affiliation(s)
- Qian Wu
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Qianyu Lv
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Xiao’an Liu
- Capital University of Medical, Beijing, China
| | - Xuejiao Ye
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Linlin Cao
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Manshi Wang
- Beijing Xicheng District Guangwai Hospital, Beijing, China
| | - Junjia Li
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Yingtian Yang
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Lanlan Li
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| | - Shihan Wang
- Guang’anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China
| |
Collapse
|
7
|
Lin H, Chen X, Pan J, Ke J, Zhang A, Liu Y, Wang C, Chang ACY, Gu J. Secretion of miRNA-326-3p by senescent adipose exacerbates myocardial metabolism in diabetic mice. J Transl Med 2022; 20:278. [PMID: 35729559 PMCID: PMC9210699 DOI: 10.1186/s12967-022-03484-7] [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] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 06/13/2022] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Adipose tissue homeostasis is at the heart of many metabolic syndromes such as diabetes. Previously it has been demonstrated that adipose tissues from diabetic patients are senescent but whether this contributes to diabetic cardiomyopathy (DCM) remains to be elucidated. METHODS The streptozotocin (STZ) type 1 diabetic mice were established as animal model, and adult mouse ventricular myocytes (AMVMs) isolated by langendorff perfusion as well as neonatal mouse ventricular myocytes (NMVMs) were used as cell models. Senescent associated β galactosidase (SA-β-gal) staining and RT-qPCR were used to identify the presence of adipose senescence in diabetic adipose tissue. Senescent adipose were removed either by surgery or by senolytic treatment. Large extracellular vesicles (LEVs) derived from adipose tissue and circulation were separated by ultracentrifugation. Cardiac systolic and diastolic function was evaluated through cardiac ultrasound. Cardiomyocytes contraction function was evaluated by the Ionoptix HTS system and live cell imaging, mitochondrial morphology and functions were evaluated by transmission electron microscope, live cell fluorescent probe and seahorse analysis. RNA-seq for AMVMs and miRNA-seq for LEVs were performed, and bioinformatic analysis combined with RT-qPCR and Western blot were used to elucidate underlying mechanism that senescent adipose derives LEVs exacerbates myocardial metabolism. RESULTS SA-β-gal staining and RT-qPCR identified the presence of adipose tissue senescence in STZ mice. Through surgical as well as pharmacological means we show that senescent adipose tissue participates in the pathogenesis of DCM in STZ mice by exacerbates myocardial metabolism through secretion of LEVs. Specifically, expression of miRNA-326-3p was up-regulated in LEVs isolated from senescent adipose tissue, circulation, and cardiomyocytes of STZ mice. Up-regulation of miRNA-326-3p coincided with myocardial transcriptomic changes in metabolism. Functionally, we demonstrate that miRNA-326-3p inhibited the expression of Rictor and resulted in impaired mitochondrial and contractile function in cardiomyocytes. CONCLUSION We demonstrate for the first time that senescent adipose derived LEVs exacerbates myocardial metabolism through up-regulated miRNA-326-3p which inhibits Rictor in cardiomyocytes. Furthermore, reducing senescence burden in adipose tissue is capable of relieving myocardial metabolism disorder in diabetes mellitus.
Collapse
Affiliation(s)
- Hao Lin
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Xiaonan Chen
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Jianan Pan
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Jiahan Ke
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Alian Zhang
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Yangyang Liu
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Changqian Wang
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Alex Chia Yu Chang
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China.
- Shanghai Institute of Precision Medicine, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China.
| | - Jun Gu
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China.
| |
Collapse
|