Long‐chain acyl‐CoA synthetase 6 regulates lipid synthesis and mitochondrial oxidative capacity in human and rat skeletal muscle

Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipi...

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Veröffentlicht in:The Journal of physiology 2017-02, Vol.595 (3), p.677-693
Hauptverfasser: Teodoro, Bruno G., Sampaio, Igor H., Bomfim, Lucas H. M., Queiroz, André L., Silveira, Leonardo R., Souza, Anderson O., Fernandes, Anna M. A. P., Eberlin, Marcos N., Huang, Tai‐Yu, Zheng, Donghai, Neufer, P. Darrell, Cortright, Ronald N., Alberici, Luciane C.
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container_issue 3
container_start_page 677
container_title The Journal of physiology
container_volume 595
creator Teodoro, Bruno G.
Sampaio, Igor H.
Bomfim, Lucas H. M.
Queiroz, André L.
Silveira, Leonardo R.
Souza, Anderson O.
Fernandes, Anna M. A. P.
Eberlin, Marcos N.
Huang, Tai‐Yu
Zheng, Donghai
Neufer, P. Darrell
Cortright, Ronald N.
Alberici, Luciane C.
description Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism. Long‐chain acyl‐CoA synthetases (ACSL 1 to 6) are key enzymes regulating the partitioning of acyl‐CoA species toward different metabolic fates such as lipid synthesis or β‐oxidation. Despite our understanding of ecotopic lipid accumulation in skeletal muscle being associated with metabolic diseases such as obesity and type II diabetes, the role of specific ACSL isoforms in lipid synthesis remains unclear. In the present study, we describe for the first time the presence of ACSL6 mRNA in human skeletal muscle and the role that ACSL6 plays in lipid synthesis in both rodent and human skeletal muscle. ACSL6 mRNA was observed to be up‐regulated by acute high‐fat meal ingestion in both rodents and humans. In rats, we also demonstrated that fasting and chronic aerobic training negatively modulated the ACSL6 mRNA and other genes of lipid synthesis. Similar results were obtained following ACSL6 knockdown in rat myotubes, which was associated with a decreased accumulation of TAGs and lipid droplets. Under the same knockdown condition, we further demonstrate an increase in fatty acid content, p‐AMPK, mitochondrial content, mitochondrial respiratory rates and palmitate oxidation. These results were associated with increased PGC‐1α, UCP2 and UCP3 mRNA and decreased reactive oxygen species production. In human myotubes, ACSL6 overexpression reduced palmitate oxidation and PGC‐1α mRNA. In conclusion, ACSL6 drives acyl‐CoA toward lipid synthesis and its downregulation improves mitochondrial biogenesis, respiratory capacity and lipid oxidation. These outcomes are associated with the activation of the AMPK/PGC1‐α pathway. Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid acc
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M. ; Queiroz, André L. ; Silveira, Leonardo R. ; Souza, Anderson O. ; Fernandes, Anna M. A. P. ; Eberlin, Marcos N. ; Huang, Tai‐Yu ; Zheng, Donghai ; Neufer, P. Darrell ; Cortright, Ronald N. ; Alberici, Luciane C.</creator><creatorcontrib>Teodoro, Bruno G. ; Sampaio, Igor H. ; Bomfim, Lucas H. M. ; Queiroz, André L. ; Silveira, Leonardo R. ; Souza, Anderson O. ; Fernandes, Anna M. A. P. ; Eberlin, Marcos N. ; Huang, Tai‐Yu ; Zheng, Donghai ; Neufer, P. Darrell ; Cortright, Ronald N. ; Alberici, Luciane C.</creatorcontrib><description>Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism. Long‐chain acyl‐CoA synthetases (ACSL 1 to 6) are key enzymes regulating the partitioning of acyl‐CoA species toward different metabolic fates such as lipid synthesis or β‐oxidation. Despite our understanding of ecotopic lipid accumulation in skeletal muscle being associated with metabolic diseases such as obesity and type II diabetes, the role of specific ACSL isoforms in lipid synthesis remains unclear. In the present study, we describe for the first time the presence of ACSL6 mRNA in human skeletal muscle and the role that ACSL6 plays in lipid synthesis in both rodent and human skeletal muscle. ACSL6 mRNA was observed to be up‐regulated by acute high‐fat meal ingestion in both rodents and humans. In rats, we also demonstrated that fasting and chronic aerobic training negatively modulated the ACSL6 mRNA and other genes of lipid synthesis. Similar results were obtained following ACSL6 knockdown in rat myotubes, which was associated with a decreased accumulation of TAGs and lipid droplets. Under the same knockdown condition, we further demonstrate an increase in fatty acid content, p‐AMPK, mitochondrial content, mitochondrial respiratory rates and palmitate oxidation. These results were associated with increased PGC‐1α, UCP2 and UCP3 mRNA and decreased reactive oxygen species production. In human myotubes, ACSL6 overexpression reduced palmitate oxidation and PGC‐1α mRNA. In conclusion, ACSL6 drives acyl‐CoA toward lipid synthesis and its downregulation improves mitochondrial biogenesis, respiratory capacity and lipid oxidation. These outcomes are associated with the activation of the AMPK/PGC1‐α pathway. Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism.</description><identifier>ISSN: 0022-3751</identifier><identifier>EISSN: 1469-7793</identifier><identifier>DOI: 10.1113/JP272962</identifier><identifier>PMID: 27647415</identifier><identifier>CODEN: JPHYA7</identifier><language>eng</language><publisher>England: Wiley Subscription Services, Inc</publisher><subject>ACSL6 ; Animals ; Cells, Cultured ; Citrate (si)-Synthase - metabolism ; Coenzyme A Ligases - genetics ; Coenzyme A Ligases - metabolism ; Diet, High-Fat ; Exercise ; Fasting ; Fatty acids ; Fatty Acids - metabolism ; Female ; human skeletal muscle ; Humans ; Lipid Metabolism - physiology ; Lipids ; long‐chain acyl‐CoA synthetase ; Male ; Metabolism ; mitochondria ; Mitochondria, Muscle - metabolism ; Muscle ; Muscle Fibers, Skeletal - metabolism ; Muscle Metabolism ; Musculoskeletal system ; Obesity - metabolism ; Oxidation ; Oxidation-Reduction ; Oxygen Consumption ; primary skeletal muscle cells ; Rats, Wistar ; Research Paper ; RNA, Messenger - metabolism ; Rodents ; Skeletal Muscle ; triacylglycerol synthesis ; β‐oxidation</subject><ispartof>The Journal of physiology, 2017-02, Vol.595 (3), p.677-693</ispartof><rights>2016 The Authors. The Journal of Physiology © 2016 The Physiological Society</rights><rights>2016 The Authors. The Journal of Physiology © 2016 The Physiological Society.</rights><rights>Journal compilation © 2017 The Physiological Society</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5116-cf059ab2fb04b4213f174985e249ccc422e8ff6fb51704288e1f757e553e69083</citedby><cites>FETCH-LOGICAL-c5116-cf059ab2fb04b4213f174985e249ccc422e8ff6fb51704288e1f757e553e69083</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5285616/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5285616/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,723,776,780,881,1411,1427,27901,27902,45550,45551,46384,46808,53766,53768</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27647415$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Teodoro, Bruno G.</creatorcontrib><creatorcontrib>Sampaio, Igor H.</creatorcontrib><creatorcontrib>Bomfim, Lucas H. M.</creatorcontrib><creatorcontrib>Queiroz, André L.</creatorcontrib><creatorcontrib>Silveira, Leonardo R.</creatorcontrib><creatorcontrib>Souza, Anderson O.</creatorcontrib><creatorcontrib>Fernandes, Anna M. A. P.</creatorcontrib><creatorcontrib>Eberlin, Marcos N.</creatorcontrib><creatorcontrib>Huang, Tai‐Yu</creatorcontrib><creatorcontrib>Zheng, Donghai</creatorcontrib><creatorcontrib>Neufer, P. Darrell</creatorcontrib><creatorcontrib>Cortright, Ronald N.</creatorcontrib><creatorcontrib>Alberici, Luciane C.</creatorcontrib><title>Long‐chain acyl‐CoA synthetase 6 regulates lipid synthesis and mitochondrial oxidative capacity in human and rat skeletal muscle</title><title>The Journal of physiology</title><addtitle>J Physiol</addtitle><description>Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism. Long‐chain acyl‐CoA synthetases (ACSL 1 to 6) are key enzymes regulating the partitioning of acyl‐CoA species toward different metabolic fates such as lipid synthesis or β‐oxidation. Despite our understanding of ecotopic lipid accumulation in skeletal muscle being associated with metabolic diseases such as obesity and type II diabetes, the role of specific ACSL isoforms in lipid synthesis remains unclear. In the present study, we describe for the first time the presence of ACSL6 mRNA in human skeletal muscle and the role that ACSL6 plays in lipid synthesis in both rodent and human skeletal muscle. ACSL6 mRNA was observed to be up‐regulated by acute high‐fat meal ingestion in both rodents and humans. In rats, we also demonstrated that fasting and chronic aerobic training negatively modulated the ACSL6 mRNA and other genes of lipid synthesis. Similar results were obtained following ACSL6 knockdown in rat myotubes, which was associated with a decreased accumulation of TAGs and lipid droplets. Under the same knockdown condition, we further demonstrate an increase in fatty acid content, p‐AMPK, mitochondrial content, mitochondrial respiratory rates and palmitate oxidation. These results were associated with increased PGC‐1α, UCP2 and UCP3 mRNA and decreased reactive oxygen species production. In human myotubes, ACSL6 overexpression reduced palmitate oxidation and PGC‐1α mRNA. In conclusion, ACSL6 drives acyl‐CoA toward lipid synthesis and its downregulation improves mitochondrial biogenesis, respiratory capacity and lipid oxidation. These outcomes are associated with the activation of the AMPK/PGC1‐α pathway. Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism.</description><subject>ACSL6</subject><subject>Animals</subject><subject>Cells, Cultured</subject><subject>Citrate (si)-Synthase - metabolism</subject><subject>Coenzyme A Ligases - genetics</subject><subject>Coenzyme A Ligases - metabolism</subject><subject>Diet, High-Fat</subject><subject>Exercise</subject><subject>Fasting</subject><subject>Fatty acids</subject><subject>Fatty Acids - metabolism</subject><subject>Female</subject><subject>human skeletal muscle</subject><subject>Humans</subject><subject>Lipid Metabolism - physiology</subject><subject>Lipids</subject><subject>long‐chain acyl‐CoA synthetase</subject><subject>Male</subject><subject>Metabolism</subject><subject>mitochondria</subject><subject>Mitochondria, Muscle - metabolism</subject><subject>Muscle</subject><subject>Muscle Fibers, Skeletal - metabolism</subject><subject>Muscle Metabolism</subject><subject>Musculoskeletal system</subject><subject>Obesity - metabolism</subject><subject>Oxidation</subject><subject>Oxidation-Reduction</subject><subject>Oxygen Consumption</subject><subject>primary skeletal muscle cells</subject><subject>Rats, Wistar</subject><subject>Research Paper</subject><subject>RNA, Messenger - metabolism</subject><subject>Rodents</subject><subject>Skeletal Muscle</subject><subject>triacylglycerol synthesis</subject><subject>β‐oxidation</subject><issn>0022-3751</issn><issn>1469-7793</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNks1qFTEUgIMo9loFn0ACbtxMzX8mG6FctFou2EVdh0wmcyc1k1yTmersXPQBfEafxKm9LVUQXIXD-fhOzg8AzzE6whjT16dnRBIlyAOwwkyoSkpFH4IVQoRUVHJ8AJ6UcoEQpkipx-CASMEkw3wFrjYpbn9-_2F74yM0dg5LsE7HsMxx7N1oioMCZredghldgcHvfLtPFl-giS0c_Jhsn2KbvQkwffOtGf2lg9bsjPXjDBdzPw0m_qazGWH57MLiDnCYig3uKXjUmVDcs_17CD69e3u-fl9tPp58WB9vKssxFpXtEFemIV2DWMMIph2WTNXcEaastYwQV3ed6BqOJWKkrh3uJJeOc-qEQjU9BG9uvLupGVxrXRyzCXqX_WDyrJPx-s9M9L3epkvNSc0FFovg1V6Q05fJlVEPvlgXgokuTUXjWtSUKkzVf6CUC8EVZQv68i_0Ik05LpO4FlJMpJT3atucSsmuu_s3Rvr6CvTtFSzoi_t93oG3a1-Aoxvgqw9u_qdIn5-eYYKWxn8Bliy9rQ</recordid><startdate>20170201</startdate><enddate>20170201</enddate><creator>Teodoro, Bruno G.</creator><creator>Sampaio, Igor H.</creator><creator>Bomfim, Lucas H. 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Darrell</au><au>Cortright, Ronald N.</au><au>Alberici, Luciane C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Long‐chain acyl‐CoA synthetase 6 regulates lipid synthesis and mitochondrial oxidative capacity in human and rat skeletal muscle</atitle><jtitle>The Journal of physiology</jtitle><addtitle>J Physiol</addtitle><date>2017-02-01</date><risdate>2017</risdate><volume>595</volume><issue>3</issue><spage>677</spage><epage>693</epage><pages>677-693</pages><issn>0022-3751</issn><eissn>1469-7793</eissn><coden>JPHYA7</coden><abstract>Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism. Long‐chain acyl‐CoA synthetases (ACSL 1 to 6) are key enzymes regulating the partitioning of acyl‐CoA species toward different metabolic fates such as lipid synthesis or β‐oxidation. Despite our understanding of ecotopic lipid accumulation in skeletal muscle being associated with metabolic diseases such as obesity and type II diabetes, the role of specific ACSL isoforms in lipid synthesis remains unclear. In the present study, we describe for the first time the presence of ACSL6 mRNA in human skeletal muscle and the role that ACSL6 plays in lipid synthesis in both rodent and human skeletal muscle. ACSL6 mRNA was observed to be up‐regulated by acute high‐fat meal ingestion in both rodents and humans. In rats, we also demonstrated that fasting and chronic aerobic training negatively modulated the ACSL6 mRNA and other genes of lipid synthesis. Similar results were obtained following ACSL6 knockdown in rat myotubes, which was associated with a decreased accumulation of TAGs and lipid droplets. Under the same knockdown condition, we further demonstrate an increase in fatty acid content, p‐AMPK, mitochondrial content, mitochondrial respiratory rates and palmitate oxidation. These results were associated with increased PGC‐1α, UCP2 and UCP3 mRNA and decreased reactive oxygen species production. In human myotubes, ACSL6 overexpression reduced palmitate oxidation and PGC‐1α mRNA. In conclusion, ACSL6 drives acyl‐CoA toward lipid synthesis and its downregulation improves mitochondrial biogenesis, respiratory capacity and lipid oxidation. These outcomes are associated with the activation of the AMPK/PGC1‐α pathway. Key points Long‐chain acyl‐CoA synthetase 6 (ACSL6) mRNA is present in human and rat skeletal muscle, and is modulated by nutritional status: exercise and fasting decrease ACSL6 mRNA, whereas acute lipid ingestion increase its expression. ACSL6 genic inhibition in rat primary myotubes decreased lipid accumulation, as well as activated the higher mitochondrial oxidative capacity programme and fatty acid oxidation through the AMPK/PGC1‐α pathway. ACSL6 overexpression in human primary myotubes increased phospholipid species and decreased oxidative metabolism.</abstract><cop>England</cop><pub>Wiley Subscription Services, Inc</pub><pmid>27647415</pmid><doi>10.1113/JP272962</doi><tpages>17</tpages><oa>free_for_read</oa></addata></record>
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subjects ACSL6
Animals
Cells, Cultured
Citrate (si)-Synthase - metabolism
Coenzyme A Ligases - genetics
Coenzyme A Ligases - metabolism
Diet, High-Fat
Exercise
Fasting
Fatty acids
Fatty Acids - metabolism
Female
human skeletal muscle
Humans
Lipid Metabolism - physiology
Lipids
long‐chain acyl‐CoA synthetase
Male
Metabolism
mitochondria
Mitochondria, Muscle - metabolism
Muscle
Muscle Fibers, Skeletal - metabolism
Muscle Metabolism
Musculoskeletal system
Obesity - metabolism
Oxidation
Oxidation-Reduction
Oxygen Consumption
primary skeletal muscle cells
Rats, Wistar
Research Paper
RNA, Messenger - metabolism
Rodents
Skeletal Muscle
triacylglycerol synthesis
β‐oxidation
title Long‐chain acyl‐CoA synthetase 6 regulates lipid synthesis and mitochondrial oxidative capacity in human and rat skeletal muscle
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