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Ferrara PJ, Lang MJ, Johnson JM, Watanabe S, McLaughlin KL, Maschek JA, Verkerke AR, Siripoksup P, Chaix A, Cox JE, Fisher-Wellman KH, Funai K. Weight loss increases skeletal muscle mitochondrial energy efficiency in obese mice. LIFE METABOLISM 2023; 2:load014. [PMID: 37206438 PMCID: PMC10195096 DOI: 10.1093/lifemeta/load014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Weight loss from an overweight state is associated with a disproportionate decrease in whole-body energy expenditure that may contribute to the heightened risk for weight regain. Evidence suggests that this energetic mismatch originates from lean tissue. Although this phenomenon is well documented, the mechanisms have remained elusive. We hypothesized that increased mitochondrial energy efficiency in skeletal muscle is associated with reduced expenditure under weight loss. Wildtype (WT) male C57BL6/N mice were fed with high fat diet for 10 weeks, followed by a subset of mice that were maintained on the obesogenic diet (OB) or switched to standard chow to promote weight loss (WL) for additional 6 weeks. Mitochondrial energy efficiency was evaluated using high-resolution respirometry and fluorometry. Mass spectrometric analyses were employed to describe the mitochondrial proteome and lipidome. Weight loss promoted ~50% increase in the efficiency of oxidative phosphorylation (ATP produced per O2 consumed, or P/O) in skeletal muscle. However, weight loss did not appear to induce significant changes in mitochondrial proteome, nor any changes in respiratory supercomplex formation. Instead, it accelerated the remodeling of mitochondrial cardiolipin (CL) acyl-chains to increase tetralinoleoyl CL (TLCL) content, a species of lipids thought to be functionally critical for the respiratory enzymes. We further show that lowering TLCL by deleting the CL transacylase tafazzin was sufficient to reduce skeletal muscle P/O and protect mice from diet-induced weight gain. These findings implicate skeletal muscle mitochondrial efficiency as a novel mechanism by which weight loss reduces energy expenditure in obesity.
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Affiliation(s)
- Patrick J. Ferrara
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
| | - Marisa J. Lang
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
| | - Jordan M. Johnson
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
| | - Shinya Watanabe
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
| | - Kelsey L. McLaughlin
- East Carolina Diabetes & Obesity Institute, East Carolina University
- Department of Physiology, East Carolina University
| | - J. Alan Maschek
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
- Metabolomics Core Research Facility, University of Utah
| | - Anthony R.P. Verkerke
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
| | | | - Amandine Chaix
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
- Molecular Medicine Program, University of Utah
| | - James E. Cox
- Diabetes & Metabolism Research Center, University of Utah
- Metabolomics Core Research Facility, University of Utah
- Department of Biochemistry, University of Utah
| | - Kelsey H. Fisher-Wellman
- East Carolina Diabetes & Obesity Institute, East Carolina University
- Department of Physiology, East Carolina University
| | - Katsuhiko Funai
- Diabetes & Metabolism Research Center, University of Utah
- Department of Nutrition & Integrative Physiology, University of Utah
- Molecular Medicine Program, University of Utah
- Department of Biochemistry, University of Utah
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2
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Zhao H, Wang W, Lin T, Gong L. Serum Metabolomics of Benign Essential Blepharospasm Using Liquid Chromatography and Orbitrap Mass Spectrometry. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:6876327. [PMID: 36452462 PMCID: PMC9704060 DOI: 10.1155/2022/6876327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 09/04/2022] [Accepted: 09/24/2022] [Indexed: 01/19/2024]
Abstract
Background Benign essential blepharospasm (BEB) is a form of focal dystonia that causes excessive involuntary spasms of the eyelids. Currently, the pathogenesis of BEB remains unclear. This study is aimed at investigating the serum metabolites profiles in patients with BEB and healthy control and to identify the mechanism and biomarkers of this disease. Methods 30 patients with BEB and 33 healthy controls were recruited for this study. We conducted the quantitative and nontargeted metabolomics analysis of the serum samples from 63 subjects by using liquid chromatography and Orbitrap mass spectrometry (LC-Orbitrap MS). Multivariate statistical analysis was performed to detect and identify different metabolites between the two groups. The Kyoto Encyclopedia of Genes and Genomes (KEGG) and receiver operating characteristic (ROC) curve analysis of the altered metabolites were performed. Results A total of 134 metabolites were found and identified. The metabolites belonged to several metabolic pathways including phenylalanine metabolism, phenylalanine, tyrosine and tryptophan biosynthesis, arginine biosynthesis, linoleic acid metabolism, tryptophan metabolism, aminoacyl-tRNA biosynthesis, sphingolipid metabolism, glycosphingolipid biosynthesis, leucine and isoleucine biosynthesis, and vitamin B6 metabolism. Eight metabolites were identified as the potential biomarkers. Conclusions These results demonstrated that serum metabolic profiling of BEB patients was significantly different from healthy controls based on LC-Orbitrap MS. Besides, metabolomics might provide useful information for a better understanding of BEB.
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Affiliation(s)
- Han Zhao
- Department of Ophthalmology, Eye, Ear, Nose, and Throat Hospital of Fudan University, Shanghai 200000, China
- Laboratory of Myopia, NHC Key Laboratory of Myopia (Fudan University), Chinese Academy of Medical Sciences, Fudan University, Shanghai 200000, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Fudan University, Shanghai 200000, China
| | - Wushuang Wang
- Department of Ophthalmology, Eye, Ear, Nose, and Throat Hospital of Fudan University, Shanghai 200000, China
- Laboratory of Myopia, NHC Key Laboratory of Myopia (Fudan University), Chinese Academy of Medical Sciences, Fudan University, Shanghai 200000, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Fudan University, Shanghai 200000, China
| | - Tong Lin
- Department of Ophthalmology, Eye, Ear, Nose, and Throat Hospital of Fudan University, Shanghai 200000, China
- Laboratory of Myopia, NHC Key Laboratory of Myopia (Fudan University), Chinese Academy of Medical Sciences, Fudan University, Shanghai 200000, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Fudan University, Shanghai 200000, China
| | - Lan Gong
- Department of Ophthalmology, Eye, Ear, Nose, and Throat Hospital of Fudan University, Shanghai 200000, China
- Laboratory of Myopia, NHC Key Laboratory of Myopia (Fudan University), Chinese Academy of Medical Sciences, Fudan University, Shanghai 200000, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Fudan University, Shanghai 200000, China
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3
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Jäntti MH, Jackson SN, Kuhn J, Parkkinen I, Sree S, Hinkle JJ, Jokitalo E, Deterding LJ, Harvey BK. Palmitate and thapsigargin have contrasting effects on ER membrane lipid composition and ER proteostasis in neuronal cells. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159219. [PMID: 35981704 PMCID: PMC9452468 DOI: 10.1016/j.bbalip.2022.159219] [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: 04/06/2022] [Revised: 07/21/2022] [Accepted: 08/10/2022] [Indexed: 11/25/2022]
Abstract
The endoplasmic reticulum (ER) is an organelle that performs several key functions such as protein synthesis and folding, lipid metabolism and calcium homeostasis. When these functions are disrupted, such as upon protein misfolding, ER stress occurs. ER stress can trigger adaptive responses to restore proper functioning such as activation of the unfolded protein response (UPR). In certain cells, the free fatty acid palmitate has been shown to induce the UPR. Here, we examined the effects of palmitate on UPR gene expression in a human neuronal cell line and compared it with thapsigargin, a known depletor of ER calcium and trigger of the UPR. We used a Gaussia luciferase-based reporter to assess how palmitate treatment affects ER proteostasis and calcium homeostasis in the cells. We also investigated how ER calcium depletion by thapsigargin affects lipid membrane composition by performing mass spectrometry on subcellular fractions and compared this to palmitate. Surprisingly, palmitate treatment did not activate UPR despite prominent changes to membrane phospholipids. Conversely, thapsigargin induced a strong UPR, but did not significantly change the membrane lipid composition in subcellular fractions. In summary, our data demonstrate that changes in membrane lipid composition and disturbances in ER calcium homeostasis have a minimal influence on each other in neuronal cells. These data provide new insight into the adaptive interplay of lipid homeostasis and proteostasis in the cell.
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Affiliation(s)
- Maria H Jäntti
- Molecular Mechanisms of Cellular Stress and Inflammation, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224, USA.
| | - Shelley N Jackson
- Translational Analytical Core, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224, USA
| | - Jeffrey Kuhn
- Mass Spectrometry Research and Support Group, National Institute of Environmental Health Sciences, Research Triangle Park, Durham, NC 27709, USA
| | - Ilmari Parkkinen
- Neuroscience Center, Helsinki Institute for Life Science, University of Helsinki, Haartmaninkatu 8, 00014 Helsinki, Finland
| | - Sreesha Sree
- Cell and Tissue Dynamics Research Programme, Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, Finland
| | - Joshua J Hinkle
- Molecular Mechanisms of Cellular Stress and Inflammation, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224, USA
| | - Eija Jokitalo
- Cell and Tissue Dynamics Research Programme, Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, Finland
| | - Leesa J Deterding
- Mass Spectrometry Research and Support Group, National Institute of Environmental Health Sciences, Research Triangle Park, Durham, NC 27709, USA
| | - Brandon K Harvey
- Molecular Mechanisms of Cellular Stress and Inflammation, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224, USA.
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4
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Podkalicka P, Mucha O, Kaziród K, Szade K, Stępniewski J, Ivanishchuk L, Hirao H, Pośpiech E, Józkowicz A, Kupiec-Weglinski JW, Dulak J, Łoboda A. miR-378 affects metabolic disturbances in the mdx model of Duchenne muscular dystrophy. Sci Rep 2022; 12:3945. [PMID: 35273230 PMCID: PMC8913680 DOI: 10.1038/s41598-022-07868-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 02/22/2022] [Indexed: 02/08/2023] Open
Abstract
Although Duchenne muscular dystrophy (DMD) primarily affects muscle tissues, the alterations to systemic metabolism manifested in DMD patients contribute to the severe phenotype of this fatal disorder. We propose that microRNA-378a (miR-378) alters carbohydrate and lipid metabolism in dystrophic mdx mice. In our study, we utilized double knockout animals which lacked both dystrophin and miR-378 (mdx/miR-378-/-). RNA sequencing of the liver identified 561 and 194 differentially expressed genes that distinguished mdx versus wild-type (WT) and mdx/miR-378-/- versus mdx counterparts, respectively. Bioinformatics analysis predicted, among others, carbohydrate metabolism disorder in dystrophic mice, as functionally proven by impaired glucose tolerance and insulin sensitivity. The lack of miR-378 in mdx animals mitigated those effects with a faster glucose clearance in a glucose tolerance test (GTT) and normalization of liver glycogen levels. The absence of miR-378 also restored the expression of genes regulating lipid homeostasis, such as Acly, Fasn, Gpam, Pnpla3, and Scd1. In conclusion, we report for the first time that miR-378 loss results in increased systemic metabolism of mdx mice. Together with our previous finding, demonstrating alleviation of the muscle-related symptoms of DMD, we propose that the inhibition of miR-378 may represent a new strategy to attenuate the multifaceted symptoms of DMD.
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Affiliation(s)
- Paulina Podkalicka
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Olga Mucha
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Katarzyna Kaziród
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Krzysztof Szade
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Jacek Stępniewski
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Liudmyla Ivanishchuk
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Hirofumi Hirao
- The Dumont-UCLA Transplantation Center, Department of Surgery, Division of Liver and Pancreas Transplantation, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Ewelina Pośpiech
- Malopolska Centre of Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Alicja Józkowicz
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Jerzy W Kupiec-Weglinski
- The Dumont-UCLA Transplantation Center, Department of Surgery, Division of Liver and Pancreas Transplantation, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Józef Dulak
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland
| | - Agnieszka Łoboda
- Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, 30-387, Kraków, Poland.
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5
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Valentine WJ, Mostafa SA, Tokuoka SM, Hamano F, Inagaki NF, Nordin JZ, Motohashi N, Kita Y, Aoki Y, Shimizu T, Shindou H. Lipidomic Analyses Reveal Specific Alterations of Phosphatidylcholine in Dystrophic Mdx Muscle. Front Physiol 2022; 12:698166. [PMID: 35095541 PMCID: PMC8791236 DOI: 10.3389/fphys.2021.698166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 12/06/2021] [Indexed: 11/13/2022] Open
Abstract
In Duchenne muscular dystrophy (DMD), lack of dystrophin increases the permeability of myofiber plasma membranes to ions and larger macromolecules, disrupting calcium signaling and leading to progressive muscle wasting. Although the biological origin and meaning are unclear, alterations of phosphatidylcholine (PC) are reported in affected skeletal muscles of patients with DMD that may include higher levels of fatty acid (FA) 18:1 chains and lower levels of FA 18:2 chains, possibly reflected in relatively high levels of PC 34:1 (with 16:0_18:1 chain sets) and low levels of PC 34:2 (with 16:0_18:2 chain sets). Similar PC alterations have been reported to occur in the mdx mouse model of DMD. However, altered ratios of PC 34:1 to PC 34:2 have been variably reported, and we also observed that PC 34:2 levels were nearly equally elevated as PC 34:1 in the affected mdx muscles. We hypothesized that experimental factors that often varied between studies; including muscle types sampled, mouse ages, and mouse diets; may strongly impact the PC alterations detected in dystrophic muscle of mdx mice, especially the PC 34:1 to PC 34:2 ratios. In order to test our hypothesis, we performed comprehensive lipidomic analyses of PC and phosphatidylethanolamine (PE) in several muscles (extensor digitorum longus, gastrocnemius, and soleus) and determined the mdx-specific alterations. The alterations in PC 34:1 and PC 34:2 were closely monitored from the neonate period to the adult, and also in mice raised on several diets that varied in their fats. PC 34:1 was naturally high in neonate’s muscle and decreased until age ∼3-weeks (disease onset age), and thereafter remained low in WT muscles but was higher in regenerated mdx muscles. Among the muscle types, soleus showed a distinctive phospholipid pattern with early and diminished mdx alterations. Diet was a major factor to impact PC 34:1/PC 34:2 ratios because mdx-specific alterations of PC 34:2 but not PC 34:1 were strictly dependent on diet. Our study identifies high PC 34:1 as a consistent biochemical feature of regenerated mdx-muscle and indicates nutritional approaches are also effective to modify the phospholipid compositions.
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Affiliation(s)
- William J. Valentine
- Department of Molecular Therapy, National Center for Neurology and Psychiatry (NCNP), National Institute of Neuroscience, Kodaira, Tokyo, Japan
- Department of Lipid Signaling, National Center for Global Health and Medicine (NCGM), Shinjuku-ku, Japan
- *Correspondence: William J. Valentine,
| | - Sherif A. Mostafa
- Department of Lipid Signaling, National Center for Global Health and Medicine (NCGM), Shinjuku-ku, Japan
- Weill Cornell Medicine—Qatar, Doha, Qatar
| | - Suzumi M. Tokuoka
- Department of Lipidomics, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan
| | - Fumie Hamano
- Department of Lipid Signaling, National Center for Global Health and Medicine (NCGM), Shinjuku-ku, Japan
- Life Sciences Core Facility, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan
| | - Natsuko F. Inagaki
- Department of Lipid Signaling, National Center for Global Health and Medicine (NCGM), Shinjuku-ku, Japan
| | - Joel Z. Nordin
- Department of Molecular Therapy, National Center for Neurology and Psychiatry (NCNP), National Institute of Neuroscience, Kodaira, Tokyo, Japan
- Department of Laboratory Medicine, Centre for Biomolecular and Cellular Medicine, Karolinska Institutet, Huddinge, Sweden
| | - Norio Motohashi
- Department of Molecular Therapy, National Center for Neurology and Psychiatry (NCNP), National Institute of Neuroscience, Kodaira, Tokyo, Japan
| | - Yoshihiro Kita
- Life Sciences Core Facility, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan
| | - Yoshitsugu Aoki
- Department of Molecular Therapy, National Center for Neurology and Psychiatry (NCNP), National Institute of Neuroscience, Kodaira, Tokyo, Japan
- Yoshitsugu Aoki,
| | - Takao Shimizu
- Department of Lipid Signaling, National Center for Global Health and Medicine (NCGM), Shinjuku-ku, Japan
| | - Hideo Shindou
- Department of Lipid Signaling, National Center for Global Health and Medicine (NCGM), Shinjuku-ku, Japan
- Department of Medical Lipid Science, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan
- Hideo Shindou,
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6
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Ferrara PJ, Verkerke ARP, Maschek JA, Shahtout JL, Siripoksup P, Eshima H, Johnson JM, Petrocelli JJ, Mahmassani ZS, Green TD, McClung JM, Cox JE, Drummond MJ, Funai K. Low lysophosphatidylcholine induces skeletal muscle myopathy that is aggravated by high-fat diet feeding. FASEB J 2021; 35:e21867. [PMID: 34499764 DOI: 10.1096/fj.202101104r] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 07/27/2021] [Accepted: 08/09/2021] [Indexed: 12/25/2022]
Abstract
Obesity alters skeletal muscle lipidome and promotes myopathy, but it is unknown whether aberrant muscle lipidome contributes to the reduction in skeletal muscle contractile force-generating capacity. Comprehensive lipidomic analyses of mouse skeletal muscle revealed a very strong positive correlation between the abundance of lysophosphatidylcholine (lyso-PC), a class of lipids that is known to be downregulated with obesity, with maximal tetanic force production. The level of lyso-PC is regulated primarily by lyso-PC acyltransferase 3 (LPCAT3), which acylates lyso-PC to form phosphatidylcholine. Tamoxifen-inducible skeletal muscle-specific overexpression of LPCAT3 (LPCAT3-MKI) was sufficient to reduce muscle lyso-PC content in both standard chow diet- and high-fat diet (HFD)-fed conditions. Strikingly, the assessment of skeletal muscle force-generating capacity ex vivo revealed that muscles from LPCAT3-MKI mice were weaker regardless of diet. Defects in force production were more apparent in HFD-fed condition, where tetanic force production was 40% lower in muscles from LPCAT3-MKI compared to that of control mice. These observations were partly explained by reductions in the cross-sectional area in type IIa and IIx fibers, and signs of muscle edema in the absence of fibrosis. Future studies will pursue the mechanism by which LPCAT3 may alter protein turnover to promote myopathy.
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Affiliation(s)
- Patrick J Ferrara
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,East Carolina Diabetes & Obesity Institute, East Carolina University, Greenville, North Carolina, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA
| | - Anthony R P Verkerke
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,East Carolina Diabetes & Obesity Institute, East Carolina University, Greenville, North Carolina, USA
| | - J Alan Maschek
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Metabolomics, Mass Spectrometry, and Proteomics Core, University of Utah, Salt Lake City, Utah, USA
| | - Justin L Shahtout
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Piyarat Siripoksup
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Hiroaki Eshima
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of International Tourism, Nagasaki International University, Sasebo, Japan
| | - Jordan M Johnson
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,East Carolina Diabetes & Obesity Institute, East Carolina University, Greenville, North Carolina, USA
| | - Jonathan J Petrocelli
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Ziad S Mahmassani
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Thomas D Green
- East Carolina Diabetes & Obesity Institute, East Carolina University, Greenville, North Carolina, USA
| | - Joseph M McClung
- East Carolina Diabetes & Obesity Institute, East Carolina University, Greenville, North Carolina, USA
| | - James E Cox
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Metabolomics, Mass Spectrometry, and Proteomics Core, University of Utah, Salt Lake City, Utah, USA.,Department of Biochemistry, University of Utah, Salt Lake City, Utah, USA
| | - Micah J Drummond
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA.,Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Katsuhiko Funai
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,East Carolina Diabetes & Obesity Institute, East Carolina University, Greenville, North Carolina, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA.,Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, Utah, USA
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7
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Phospholipids: Identification and Implication in Muscle Pathophysiology. Int J Mol Sci 2021; 22:ijms22158176. [PMID: 34360941 PMCID: PMC8347011 DOI: 10.3390/ijms22158176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 07/24/2021] [Accepted: 07/26/2021] [Indexed: 12/29/2022] Open
Abstract
Phospholipids (PLs) are amphiphilic molecules that were essential for life to become cellular. PLs have not only a key role in compartmentation as they are the main components of membrane, but they are also involved in cell signaling, cell metabolism, and even cell pathophysiology. Considered for a long time to simply be structural elements of membranes, phospholipids are increasingly being viewed as sensors of their environment and regulators of many metabolic processes. After presenting their main characteristics, we expose the increasing methods of PL detection and identification that help to understand their key role in life processes. Interest and importance of PL homeostasis is growing as pathogenic variants in genes involved in PL biosynthesis and/or remodeling are linked to human diseases. We here review diseases that involve deregulation of PL homeostasis and present a predominantly muscular phenotype.
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8
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Mateus T, Martins F, Nunes A, Herdeiro MT, Rebelo S. Metabolic Alterations in Myotonic Dystrophy Type 1 and Their Correlation with Lipin. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18041794. [PMID: 33673200 PMCID: PMC7918590 DOI: 10.3390/ijerph18041794] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/06/2021] [Accepted: 02/08/2021] [Indexed: 12/14/2022]
Abstract
Myotonic dystrophy type 1 (DM1) is an autosomal dominant hereditary and multisystemic disease, characterized by progressive distal muscle weakness and myotonia. Despite huge efforts, the pathophysiological mechanisms underlying DM1 remain elusive. In this review, the metabolic alterations observed in patients with DM1 and their connection with lipin proteins are discussed. We start by briefly describing the epidemiology, the physiopathological and systemic features of DM1. The molecular mechanisms proposed for DM1 are explored and summarized. An overview of metabolic syndrome, dyslipidemia, and the summary of metabolic alterations observed in patients with DM1 are presented. Patients with DM1 present clinical evidence of metabolic alterations, namely increased levels of triacylglycerol and low-density lipoprotein, increased insulin and glucose levels, increased abdominal obesity, and low levels of high-density lipoprotein. These metabolic alterations may be associated with lipins, which are phosphatidate phosphatase enzymes that regulates the triacylglycerol levels, phospholipids, lipid signaling pathways, and are transcriptional co-activators. Furthermore, lipins are also important for autophagy, inflammasome activation and lipoproteins synthesis. We demonstrate the association of lipin with the metabolic alterations in patients with DM1, which supports further clinical studies and a proper exploration of lipin proteins as therapeutic targets for metabolic syndrome, which is important for controlling many diseases including DM1.
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Affiliation(s)
| | | | | | | | - Sandra Rebelo
- Correspondence: ; Tel.: +351-924-406-306; Fax: +351-234-372-587
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9
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Van Pelt DW, Kharaz YA, Sarver DC, Eckhardt LR, Dzierzawski JT, Disser NP, Piacentini AN, Comerford E, McDonagh B, Mendias CL. Multiomics analysis of the mdx/mTR mouse model of Duchenne muscular dystrophy. Connect Tissue Res 2021; 62:24-39. [PMID: 32664808 DOI: 10.1080/03008207.2020.1791103] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE/AIM Duchenne muscular dystrophy (DMD) is a progressive neuromuscular disease characterized by extensive muscle weakness. Patients with DMD lack a functional dystrophin protein, which transmits force and organizes the cytoskeleton of skeletal muscle. Multiomic studies have been proposed as a way to obtain novel insight about disease processes from preclinical models, and we used this approach to study pathological changes in dystrophic muscles. MATERIALS AND METHODS We evaluated hindlimb muscles of male mdx/mTR mice, which lack a functional dystrophin protein and have deficits in satellite cell abundance and proliferative capacity. Wild type (WT) C57BL/6 J mice served as controls. Muscle fiber contractility was measured, along with changes in the transcriptome using RNA sequencing, and in the proteome, metabolome, and lipidome using mass spectrometry. RESULTS While mdx/mTR mice displayed gross pathological changes and continued cycles of degeneration and regeneration, we found no differences in permeabilized fiber contractility between strains. However, there were numerous changes in the transcriptome and proteome related to protein balance, contractile elements, extracellular matrix, and metabolism. There was only a 53% agreement in fold-change data between the proteome and transcriptome. Numerous changes in markers of skeletal muscle metabolism were observed, with dystrophic muscles exhibiting elevated glycolytic metabolites such as 6-phosphoglycerate, fructose-6-phosphate and glucose-6-phosphate, fructose bisphosphate, phosphorylated hexoses, and phosphoenolpyruvate. CONCLUSIONS These findings highlight the utility of multiomics in studying muscle disease, and provide additional insight into the pathological changes in dystrophic muscles that might help to indirectly guide evidence-based nutritional or exercise prescription in DMD patients.
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Affiliation(s)
- Douglas W Van Pelt
- Department of Rehabilitation Sciences, College of Health Sciences, University of Kentucky , Lexington, KY, USA
| | - Yalda A Kharaz
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool , Liverpool, UK
| | - Dylan C Sarver
- Department of Orthopaedic Surgery, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Logan R Eckhardt
- Department of Orthopaedic Surgery, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Justin T Dzierzawski
- Department of Orthopaedic Surgery, University of Michigan Medical School , Ann Arbor, MI, USA
| | | | - Alex N Piacentini
- Research Institute, Hospital for Special Surgery , New York, NY, USA
| | - Eithne Comerford
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool , Liverpool, UK
| | - Brian McDonagh
- Department of Physiology, School of Medicine, National University of Ireland , Galway, Ireland
| | - Christopher L Mendias
- Department of Orthopaedic Surgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Research Institute, Hospital for Special Surgery , New York, NY, USA.,Department of Physiology & Biophysics, Weill Cornell Medical College , New York, NY, USA
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10
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Bal NC, Periasamy M. Uncoupling of sarcoendoplasmic reticulum calcium ATPase pump activity by sarcolipin as the basis for muscle non-shivering thermogenesis. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190135. [PMID: 31928193 DOI: 10.1098/rstb.2019.0135] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Thermogenesis in endotherms relies on both shivering and non-shivering thermogenesis (NST). The role of brown adipose tissue (BAT) in NST is well recognized, but the role of muscle-based NST has been contested. However, recent studies have provided substantial evidence for the importance of muscle-based NST in mammals. This review focuses primarily on the role of sarcoplasmic reticulum (SR) Ca2+-cycling in muscle NST; specifically, it will discuss recent data showing how uncoupling of sarcoendoplasmic reticulum calcium ATPase (SERCA) (inhibition of Ca2+ transport but not ATP hydrolysis) by sarcolipin (SLN) results in futile SERCA pump activity, increased ATP hydrolysis and heat production contributing to muscle NST. It will also critically examine how activation of muscle NST can be an important factor in regulating metabolic rate and whole-body energy homeostasis. In this regard, SLN has emerged as a powerful signalling molecule to promote mitochondrial biogenesis and oxidative metabolism in muscle. Furthermore, we will discuss the functional interplay between BAT and muscle, especially with respect to how reduced BAT function in mammals could be compensated by muscle-based NST. Based on the existing data, we argue that SLN-mediated thermogenesis is an integral part of muscle NST and that muscle NST potentially contributed to the evolution of endothermy within the vertebrate clade. This article is part of the theme issue 'Vertebrate palaeophysiology'.
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Affiliation(s)
- Naresh C Bal
- KIIT School of Biotechnology, KIIT University, Bhubaneswar, Odisha 751021, India
| | - Muthu Periasamy
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA
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11
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Gu R, Huang T, Xiao J, Liao Z, Li J, Lan H, Ouyang J, Hu J, Liao H. The IRE1α Arm of UPR Regulates Muscle Cells Immune Characters by Restraining p38 MAPK Activation. Front Physiol 2019; 10:1198. [PMID: 31607947 PMCID: PMC6761248 DOI: 10.3389/fphys.2019.01198] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 09/03/2019] [Indexed: 12/24/2022] Open
Abstract
Skeletal muscle repair and systemic inflammation/immune responses are linked to endoplasmic reticulum stress (ER stress) pathways in myopathic muscle, and muscle cells play an active role in muscular immune reactions by exhibiting immunological characteristics under persistent proinflammation stimuli. Whether ER stress affects the intrinsic immunological capacities of myocytes in the inflammatory milieu, as it does to immune cells, and which arms of the unfolded protein response (UPR) mainly participate in these processes remain mostly unknown. We investigated this issue and showed that inflammatory stimuli can induce the activation of the protein kinase R (PKR)-like endoplasmic reticulum kinase (PERK) and inositol-requiring enzyme 1α (IRE1α) arms of the UPR in myocytes both in vivo and in vitro. UPR stressor administration reversed the increased IFN-γ-induced expression of the MHC-II molecule H2-Ea, the MHC-I molecule H-2Kb, toll-like receptor 3 (TLR3) and some proinflammatory myokines in differentiated primary myotubes in vitro. However, further IRE1α inhibition thoroughly corrected the trend in the UPR stressor-triggered suppression of immunobiological molecules. In IFN-γ-treated myotubes, dramatic p38 MAPK activation was observed under IRE1α inhibitory conditions, and the pharmacological inhibition of p38 reversed the immune molecule upregulation induced by IRE1α inhibition. In parallel, our coculturing system verified that the ovalbumin (OVA) antigen presentation ability of inflamed myotubes to OT-I T cells was enhanced by IRE1α inhibition, but was attenuated by further p38 inhibition. Thus, the present findings demonstrated that p38 MAPK contributes greatly to IRE1α arm-dependent immunobiological suppression in myocytes under inflammatory stress conditions.
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Affiliation(s)
- RuiCai Gu
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Tao Huang
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - JiangWei Xiao
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - ZhaoHong Liao
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - JunHua Li
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - HaiQiang Lan
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Jun Ouyang
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - JiJie Hu
- Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Hua Liao
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
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12
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Sunderhaus ER, Law AD, Kretzschmar D. ER responses play a key role in Swiss-Cheese/Neuropathy Target Esterase-associated neurodegeneration. Neurobiol Dis 2019; 130:104520. [PMID: 31233884 DOI: 10.1016/j.nbd.2019.104520] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 05/01/2019] [Accepted: 06/20/2019] [Indexed: 01/08/2023] Open
Abstract
Swiss Cheese (SWS) is the Drosophila orthologue of Neuropathy Target Esterase (NTE), a phospholipase that when mutated has been shown to cause a spectrum of disorders in humans that range from intellectual disabilities to ataxia. Loss of SWS in Drosophila also causes locomotion deficits, age-dependent neurodegeneration, and an increase in lysophosphatidylcholine (LPC) and phosphatidylcholine (PC). SWS is localized to the Endoplasmic Reticulum (ER), and recently, it has been shown that perturbing the membrane lipid composition of the ER can lead to the activation of ER stress responses through the inhibition of the Sarco/Endoplasmic Reticulum Ca2+ ATPase (SERCA). To investigate whether ER stress induction occurs in NTE-associated disorders, we used the fly sws null mutant as a model. sws flies showed an activated ER stress response as determined by elevated levels of the chaperone GRP78 and by increased splicing of XBP, an ER transcription factor that activates transcriptional ER stress responses. To address whether ER stress plays a role in the degenerative and behavioral phenotypes detected in sws1, we overexpressed XBP1, or treated the flies with tauroursodeoxycholic acid (TUDCA), a chemical known to attenuate ER stress-mediated cell death. Both manipulations suppressed the locomotor deficits and neurodegeneration of sws1. In addition, sws1 flies showed reduced SERCA levels and expressing additional SERCA also suppressed the sws1-related phenotypes. This suggests that the disruption in lipid compositions and its effect on SERCA are inducing ER stress, aimed to ameliorate the deleterious effects of sws1. This includes the effects on lipid composition because XBP1 and SERCA expression also reduced the LPC levels in sws1. Promoting cytoprotective ER stress pathways may therefore provide a therapeutic approach to alleviate the neurodegeneration and motor symptoms seen in NTE-associated disorders.
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Affiliation(s)
- Elizabeth R Sunderhaus
- Oregon Institute of Occupational Health Sciences, 3181 SW Sam Jackson Park Rd., Portland, OR 97239, United States of America
| | - Alexander D Law
- Oregon Institute of Occupational Health Sciences, 3181 SW Sam Jackson Park Rd., Portland, OR 97239, United States of America
| | - Doris Kretzschmar
- Oregon Institute of Occupational Health Sciences, 3181 SW Sam Jackson Park Rd., Portland, OR 97239, United States of America.
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13
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Fajardo VA, Mikhaeil JS, Leveille CF, Tupling AR, LeBlanc PJ. Elevated whole muscle phosphatidylcholine: phosphatidylethanolamine ratio coincides with reduced SERCA activity in murine overloaded plantaris muscles. Lipids Health Dis 2018. [PMID: 29534725 PMCID: PMC5851149 DOI: 10.1186/s12944-018-0687-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND An increase in phosphatidylcholine:phosphatidylethanolamine (PC:PE) and a decrease in fatty acyl chain length, monounsaturated:polyunsaturated (MUFA:PUFA) fatty acyl ratio reduces SERCA activity in liposomes and in mouse models of obesity and muscular dystrophy. We have previously shown that maximal SERCA activity is significantly reduced in mechanically overloaded (OVL) plantaris, however, whether changes in PC:PE ratio or fatty acyl composition may contribute to the alterations in maximal SERCA activity remain unknown. Here, we tested the hypotheses that in OVL plantaris 1) PC:PE ratio would negatively correlate with maximal SERCA activity and 2) PC fatty acyl chain length (ACL) and/or MUFA:PUFA ratio would positively correlate with maximal SERCA activity. METHODS To overload plantaris in mice, we transected the soleus and gastrocnemius tendons from one leg, while the contralateral leg underwent a sham surgery. After two weeks, plantaris muscles were extracted, homogenized and processed for SERCA activity and lipid analyses. Specifically, we performed HPTLC densitometry to examine changes in PC, PE, and the ratio of PC:PE. We also performed gas chromatography to assess any potential changes to fatty acyl composition. RESULTS SERCA activity was significantly reduced in OVL plantaris compared with sham. Coinciding with this, we found a significant increase in PC but not PE in OVL plantaris. In turn, there was an increase in PC:PE but did not reach significance (p = 0.09). However, we found a significant negative correlation between PC:PE and maximal SERCA activity. Fatty acyl composition of PE remained similar between OLV and sham and PC demonstrated higher percent mole fraction of 17:1, 18:1, and ACL compared to sham. In addition, PC ACL, % MUFA, % PUFA, or MUFA:PUFA did not significantly correlate with maximal SERCA activity. CONCLUSIONS Our results indicate that the phospholipid headgroup PC:PE negatively correlated and could potentially contribute to reductions in SERCA activity seen in functionally overloaded plantaris. In contrast, fatty acyl chain (ACL, % MUFA, % PUFA, MUFA:PUFA) did not correlate with maximal SERCA activity. Future studies will determine whether altering PC:PE with genetic and dietary interventions can influence SERCA activity and ultimately change the physiological outcome in response to muscle overloading.
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Affiliation(s)
- Val A Fajardo
- Department of Health Sciences, Brock University, St. Catharines, ON, L2S 3A1, Canada.,Centre for Bone and Muscle Health, Faculty of Applied Health Sciences, Brock University, St. Catharines, ON, Canada
| | - John S Mikhaeil
- Department of Health Sciences, Brock University, St. Catharines, ON, L2S 3A1, Canada.,Centre for Bone and Muscle Health, Faculty of Applied Health Sciences, Brock University, St. Catharines, ON, Canada
| | - Cameron F Leveille
- Department of Health Sciences, Brock University, St. Catharines, ON, L2S 3A1, Canada.,Centre for Bone and Muscle Health, Faculty of Applied Health Sciences, Brock University, St. Catharines, ON, Canada
| | - A Russell Tupling
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Paul J LeBlanc
- Department of Health Sciences, Brock University, St. Catharines, ON, L2S 3A1, Canada. .,Centre for Bone and Muscle Health, Faculty of Applied Health Sciences, Brock University, St. Catharines, ON, Canada.
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14
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Montgomery MK, Brown SHJ, Mitchell TW, Coster ACF, Cooney GJ, Turner N. Association of muscle lipidomic profile with high-fat diet-induced insulin resistance across five mouse strains. Sci Rep 2017; 7:13914. [PMID: 29066734 PMCID: PMC5654831 DOI: 10.1038/s41598-017-14214-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 10/05/2017] [Indexed: 12/20/2022] Open
Abstract
Different mouse strains exhibit variation in their inherent propensities to develop metabolic disease. We recently showed that C57BL6, 129X1, DBA/2 and FVB/N mice are all susceptible to high-fat diet-induced glucose intolerance, while BALB/c mice are relatively protected, despite changes in many factors linked with insulin resistance. One parameter strongly linked with insulin resistance is ectopic lipid accumulation, especially metabolically active ceramides and diacylglycerols (DAG). This study examined diet-induced changes in the skeletal muscle lipidome across these five mouse strains. High-fat feeding increased total muscle triacylglycerol (TAG) content, with elevations in similar triacylglycerol species observed for all strains. There were also generally consistent changes across strains in the abundance of different phospholipid (PL) classes and the fatty acid profile of phospholipid molecular species, with the exception being a strain-specific difference in phospholipid species containing two polyunsaturated fatty acyl chains in BALB/c mice (i.e. a diet-induced decrease in the other four strains, but no change in BALB/c mice). In contrast to TAG and PL, the high-fat diet had a minor influence on DAG and ceramide species across all strains. These results suggest that widespread alterations in muscle lipids are unlikely a major contributors to the favourable metabolic profile of BALB/c mice and rather there is a relatively conserved high-fat diet response in muscle of most mouse strains.
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Affiliation(s)
- Magdalene K Montgomery
- Department of Pharmacology, School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
- Diabetes & Metabolism Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - Simon H J Brown
- School of Medicine, University of Wollongong, Wollongong, NSW, Australia
- llawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, Australia
| | - Todd W Mitchell
- School of Medicine, University of Wollongong, Wollongong, NSW, Australia
- llawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, Australia
| | - Adelle C F Coster
- School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia
| | - Gregory J Cooney
- Diabetes & Metabolism Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
- St Vincent's Clinical School, University of New South Wales, Sydney, NSW, Australia
| | - Nigel Turner
- Department of Pharmacology, School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia.
- Diabetes & Metabolism Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia.
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