1
|
Kugler BA, Thyfault JP, McCoin CS. Sexually dimorphic hepatic mitochondrial adaptations to exercise: a mini-review. J Appl Physiol (1985) 2023; 134:685-691. [PMID: 36701482 PMCID: PMC10027083 DOI: 10.1152/japplphysiol.00711.2022] [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: 11/22/2022] [Revised: 01/23/2023] [Accepted: 01/23/2023] [Indexed: 01/27/2023] Open
Abstract
Exercise is a physiological stress that disrupts tissue and cellular homeostasis while enhancing systemic metabolic energy demand mainly through the increased workload of skeletal muscle. Although the extensive focus has been on skeletal muscle adaptations to exercise, the liver senses these disruptions in metabolic energy homeostasis and responds to provide the required substrates to sustain increased demand. Hepatic metabolic flexibility is an energetically costly process that requires continuous mitochondrial production of the cellular currency ATP. To do so, the liver must maintain a healthy functioning mitochondrial pool, attained through well-regulated and dynamic processes. Intriguingly, some of these responses are sex-dependent. This mini-review examines the hepatic mitochondrial adaptations to exercise with a focus on sexual dimorphism.
Collapse
Affiliation(s)
- Benjamin A Kugler
- Department of Cell Biology and Physiology, The University of Kansas Medical Center, Kansas City, Kansas, United States
- KU Diabetes Institute, The University of Kansas Medical Center, Kansas City, Kansas, United States
- Kansas Center for Metabolism and Obesity Research, The University of Kansas Medical Center, Kansas City, Kansas, United States
| | - John P Thyfault
- Department of Cell Biology and Physiology, The University of Kansas Medical Center, Kansas City, Kansas, United States
- KU Diabetes Institute, The University of Kansas Medical Center, Kansas City, Kansas, United States
- Kansas Center for Metabolism and Obesity Research, The University of Kansas Medical Center, Kansas City, Kansas, United States
- Center for Children's Healthy Lifestyles and Nutrition, Kansas City, Missouri, United States
- Division of Endocrinology and Metabolism, Department of Internal Medicine, The University of Kansas Medical Center, Kansas City, Kansas, United States
- Kansas City Veterans Affairs Medical Center, Kansas City, Missouri, United States
| | - Colin S McCoin
- Department of Cell Biology and Physiology, The University of Kansas Medical Center, Kansas City, Kansas, United States
- KU Diabetes Institute, The University of Kansas Medical Center, Kansas City, Kansas, United States
- Kansas Center for Metabolism and Obesity Research, The University of Kansas Medical Center, Kansas City, Kansas, United States
- Center for Children's Healthy Lifestyles and Nutrition, Kansas City, Missouri, United States
- Kansas City Veterans Affairs Medical Center, Kansas City, Missouri, United States
| |
Collapse
|
2
|
Deng L, Yi S, Yin X, Li Y, Luan Q. MFN2 knockdown promotes osteogenic differentiation of iPSC-MSCs through aerobic glycolysis mediated by the Wnt/β-catenin signaling pathway. Stem Cell Res Ther 2022; 13:162. [PMID: 35413941 PMCID: PMC9006575 DOI: 10.1186/s13287-022-02836-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 03/21/2022] [Indexed: 12/02/2022] Open
Abstract
Background Mitofusin-2 (MFN2) is a kind of GTPase that participates in the regulation of mitochondrial fusion, which is related to a variety of physiological and pathological processes, including energy metabolism, cell differentiation, and embryonic development. However, it remains unclear whether MFN2 is involved in the metabolism and osteogenic differentiation of mesenchymal stem cells (MSCs). Methods MFN2 knockdown (MFN2-KD) and MFN2-overexpressing (MFN2-OE) induced pluripotent stem cell-derived mesenchymal stem cells (iPSC-MSCs) were constructed by lentivirus. The commercial kits were utilized to detect the glycolysis and oxidative phosphorylation (OXPHOS) rate. Flow cytometry, Western blot, quantitative real-time polymerase chain reaction (qRT-PCR), RNA-seq, immunofluorescence, and immunoprecipitation were employed for phenotype and molecular mechanism assessment. Results We demonstrated that MFN2 and Wnt/β-catenin signaling pathway regulated glycolysis of iPSC-MSCs. The lack of MFN2 promoted the osteogenic differentiation of iPSC-MSCs, and aerobic glycolysis in the presence of sufficient oxygen, which increased glucose consumption and lactic acid production, as well as the glycolytic enzyme activity and gene expression. Inhibiting the Wnt/β-catenin signaling pathway normalized the enhanced glycolytic rate and osteogenic differentiation of MFN2-KD iPSC-MSCs. MFN2-OE iPSC-MSCs displayed the opposite phenotype. Conclusions Downregulating MFN2 promotes osteogenic differentiation of iPSC-MSCs through aerobic glycolysis mediated by the Wnt/β-catenin signaling pathway. Our research reveals the new function of MFN2 in regulating the osteogenic differentiation and energy metabolism of MSCs, which will provide a new therapeutic target and theoretical basis for alveolar bone repair and periodontal regenerative treatment. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-022-02836-w.
Collapse
Affiliation(s)
- Lidi Deng
- Department of Periodontology, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing, 100081, People's Republic of China
| | - Siqi Yi
- Department of Periodontology, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing, 100081, People's Republic of China
| | - Xiaohui Yin
- Department of First Clinical Division, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing, 100081, People's Republic of China
| | - Yang Li
- Department of Cell Biology, School of Basic Medical Sciences, Peking University Stem Cell Research Center, Peking University, Beijing, 100191, People's Republic of China.
| | - Qingxian Luan
- Department of Periodontology, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing, 100081, People's Republic of China.
| |
Collapse
|
3
|
Xu Y, Tang Z, Dai H, Hou J, Li F, Tang Z, Zhang D. MiR-195 promotes pancreatic β-cell dedifferentiation by targeting Mfn2 and impairing Pi3k/Akt signaling in type 2 diabetes. Obesity (Silver Spring) 2022; 30:447-459. [PMID: 35088561 DOI: 10.1002/oby.23360] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 11/10/2021] [Accepted: 11/16/2021] [Indexed: 01/20/2023]
Abstract
OBJECTIVE The aim of this study was to research the role and underlying mechanism of miR-195 involved in pancreatic β-cell dedifferentiation induced by hyperlipemia in type 2 diabetes mellitus. METHODS High-fat-diet-induced obese C57BL/6J mice and palmitate-stimulated Min6 cells were used as the models of β-cell dedifferentiation in vivo and in vitro, respectively. The expression of miR-195 and insulin secretion during β-cell dedifferentiation were measured. Also, the influence of regulated miR-195 expression on β-cell dedifferentiation was examined. Meanwhile, the IRS-1/2/Pi3k/Akt pathway and mitofusin-2 (Mfn2) expression were investigated during β-cell dedifferentiation. RESULTS MiR-195 was upregulated during lipotoxicity-induced β-cell dedifferentiation in both in vivo and in vitro experiments, and miR-195 functionally contributed to lipotoxicity-induced β-cell dedifferentiation. Furthermore, miR-195 inhibited IRS-1/2/Pi3k/Akt pathway activation, which accompanied β-cell dedifferentiation. Mfn2, a target of miR-195, was found to be downregulated and was associated with increased mitochondrial production of reactive oxygen species during β-cell dedifferentiation. Instructively, inhibition of miR-195, at least partially, reversed the downregulation of Mfn2, restored IRS-1/2/Pi3k/Akt pathway activation, and prevented β-cell dedifferentiation. CONCLUSIONS MiR-195 promoted β-cell dedifferentiation through negatively regulating Mfn2 expression and inhibiting the IRS-1/2/Pi3k/Akt pathway, providing a promising treatment for type 2 diabetes mellitus.
Collapse
Affiliation(s)
- Yuhua Xu
- Department of Endocrinology, Affiliated Hospital of Nantong University, Jiangsu, China
| | - Zixuan Tang
- Department of Endocrinology, Affiliated Hospital of Nantong University, Jiangsu, China
| | - Hui Dai
- Department of Endocrinology, Affiliated Hospital of Nantong University, Jiangsu, China
| | - Jue Hou
- Department of Endocrinology, Affiliated Hospital of Nantong University, Jiangsu, China
| | - Fangqin Li
- Department of Endocrinology, Affiliated Hospital of Nantong University, Jiangsu, China
| | - Zhuqi Tang
- Department of Endocrinology, Affiliated Hospital of Nantong University, Jiangsu, China
| | - Dongmei Zhang
- Medical Research Center, Affiliated Hospital 2 of Nantong University, Jiangsu, China
| |
Collapse
|
4
|
Pei H, Du J, Song X, He L, Zhang Y, Li X, Qiu C, Zhang Y, Hou J, Feng J, Gao E, Li D, Yang Y. Melatonin prevents adverse myocardial infarction remodeling via Notch1/Mfn2 pathway. Free Radic Biol Med 2016; 97:408-417. [PMID: 27387769 DOI: 10.1016/j.freeradbiomed.2016.06.015] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 06/04/2016] [Accepted: 06/16/2016] [Indexed: 01/17/2023]
Abstract
Mitochondrial dysfunction is linked with myocardial infarction (MI), a disorder in which Notch1 has attracted increasing attention. However, the involvement of Notch1 in mitochondrial impairment after an MI is poorly understood, as is the role of mitochondrial fusion-associated protein 2 (Mfn2). Moreover, whether melatonin potentiates the Notch1/Mfn2 pathway in post-MI cardiac damage remains unclear. In our study, small interfering RNAs against Notch1 or Mfn2 and Jagged1 peptide were delivered via intramyocardial injection. At 3 days after these treatments, MI was induced by ligation of the anterior descending branch. We found that this ablation of Notch1 or Mfn2 aggravated post-MI injury, including worsened mitochondrial damage and increased generation of reactive oxygen species (ROS). In contrast, Jagged1 improved mitochondrial structure and function, decreased ROS production and attenuated post-MI injury. Interestingly, though Mfn2 expression was mildly regulated by Notch1 signaling in myocardium, Mfn2 deficiency nearly eliminated the cardioprotection by Jagged1, as evidenced by suppressed cardiac function, aggravated myocardial fibrosis, increased cell apoptosis, worsened mitochondrial impairment and enhanced oxidative stress. These observations revealed that Mfn2 plays an indispensable role in protection against MI-induced injury by Notch1. The mechanism might involve disrupting a damaging cycle of mitochondrial damage and ROS generation. Furthermore, melatonin activated Notch1 signaling and increased Mfn2 expression were reversed by luzindole, a nonselective antagonist of the melatonin receptor. Notably, melatonin attenuated post-MI injury in normal mice, but not in mice deficient in Notch1 or Mfn2. These results demonstrate that melatonin attenuates post-MI injury via the Notch1/Mfn2 pathway in a receptor-dependent manner.
Collapse
Affiliation(s)
- Haifeng Pei
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China; Third Military Medical University, Chongqing 400042, China
| | - Jin Du
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Xiaofeng Song
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Lei He
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Yufei Zhang
- Department of Medical Genetics and Developmental Biology, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032, China
| | - Xiuchuan Li
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Chenming Qiu
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Yangyang Zhang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Juanni Hou
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Juan Feng
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Erhe Gao
- Center of Translational Medicine, Temple University School of Medicine, Philadelphia, PA 19140, USA
| | - De Li
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Yongjian Yang
- Department of Cardiology, Chengdu Military General Hospital, Chengdu 610083, China; Third Military Medical University, Chongqing 400042, China.
| |
Collapse
|
5
|
KONG DEXIAN, SONG GUANGYAO, WANG CHAO, MA HUIJUAN, REN LUPING, NIE QIAN, ZHANG XUEMEI, GAN KEXIN. Overexpression of mitofusin 2 improves translocation of glucose transporter 4 in skeletal muscle of high-fat diet-fed rats through AMP-activated protein kinase signaling. Mol Med Rep 2013; 8:205-10. [DOI: 10.3892/mmr.2013.1457] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 04/23/2013] [Indexed: 11/05/2022] Open
|
6
|
Gan KX, Wang C, Chen JH, Zhu CJ, Song GY. Mitofusin-2 ameliorates high-fat diet-induced insulin resistance in liver of rats. World J Gastroenterol 2013; 19:1572-1581. [PMID: 23538485 PMCID: PMC3602474 DOI: 10.3748/wjg.v19.i10.1572] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Revised: 11/13/2012] [Accepted: 01/05/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effects of mitofusin-2 (MFN2) on insulin sensitivity and its potential targets in the liver of rats fed with a high-fat diet (HFD).
METHODS: Rats were fed with a control or HFD for 4 or 8 wk, and were then infected with a control or an MFN2 expressing adenovirus once a week for 3 wk starting from the 9th wk. Blood glucose (BG), plasma insulin and insulin sensitivity of rats were determined at end of the 4th and 8th wk, and after treatment with different amounts of MFN2 expressing adenovirus (108, 109 or 1010 vp/kg body weight). BG levels were measured by Accu-chek Active Meter. Plasma insulin levels were analyzed by using a Rat insulin enzyme-linked immunosorbent assay kit. Insulin resistance was evaluated by measuring the glucose infusion rate (GIR) using a hyperinsulinemic euglycemic clamp technique. The expression or phosphorylation levels of MFN2 and essential molecules in the insulin signaling pathway, such as insulin receptor (INSR), insulin receptor substrate 2 (IRS2), phosphoinositide-3-kinase (PI3K), protein kinase beta (AKT2) and glucose transporter type 2 (GLUT2) was assayed by quantitative real-time polymerase chain reaction and Western-blotting.
RESULTS: After the end of 8 wk, the body weight of rats receiving the normal control diet (ND) and the HFD was not significantly different (P > 0.05). Compared with the ND group, GIR in the HFD group was significantly decreased (P < 0.01), while the levels of BG, triglycerides (TG), total cholesterol (TC) and insulin in the HFD group were significantly higher than those in the ND group (P < 0.05). Expression of MFN2 mRNA and protein in liver of rats was significantly down-regulated in the HFD group (P < 0.01) after 8 wk of HFD feeding. The expression of INSR, IRS2 and GLUT2 were down-regulated markedly (P < 0.01). Although there were no changes in PI3K-P85 and AKT2 expression, their phosphorylation levels were decreased significantly (P < 0.01). After intervention with MFN2 expressing adenovirus for 3 wk, the expression of MFN2 mRNA and protein levels were up-regulated (P < 0.01). There was no difference in body weight of rats between the groups. The levels of BG, TG, TC and insulin in rats were lower than those in the Ad group (P < 0.05), but GIR in rats infected with Ad-MFN2 was significantly increased (P < 0.01), compared with the Ad group. The expression of INSR, IRS2 and GLUT2 was increased, while phosphorylation levels of PI3K-P85 and AKT2 were increased (P < 0.01), compared with the Ad group.
CONCLUSION: HFDs induce insulin resistance, and this can be reversed by MFN2 over-expression targeting the insulin signaling pathway.
Collapse
|
7
|
Increased insulin sensitivity and distorted mitochondrial adaptations during muscle unloading. Int J Mol Sci 2012; 13:16971-85. [PMID: 23443131 PMCID: PMC3546734 DOI: 10.3390/ijms131216971] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Revised: 11/27/2012] [Accepted: 11/29/2012] [Indexed: 11/17/2022] Open
Abstract
We aimed to further investigate mitochondrial adaptations to muscle disuse and the consequent metabolic disorders. Male rats were submitted to hindlimb unloading (HU) for three weeks. Interestingly, HU increased insulin sensitivity index (ISI) and decreased blood level of triglyceride and insulin. In skeletal muscle, HU decreased expression of pyruvate dehydrogenase kinase 4 (PDK4) and its protein level in mitochondria. HU decreased mtDNA content and mitochondrial biogenesis biomarkers. Dynamin-related protein (Drp1) in mitochondria and Mfn2 mRNA level were decreased significantly by HU. Our findings provide more extensive insight into mitochondrial adaptations to muscle disuse, involving the shift of fuel utilization towards glucose, the decreased mitochondrial biogenesis and the distorted mitochondrial dynamics.
Collapse
|