{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T14:33:15Z","timestamp":1788964395866,"version":"build-2803163510"},"reference-count":60,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2023,8,22]],"date-time":"2023-08-22T00:00:00Z","timestamp":1692662400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Institutes of Health","award":["DK067912"],"award-info":[{"award-number":["DK067912"]}]},{"name":"National Institutes of Health","award":["DK112917"],"award-info":[{"award-number":["DK112917"]}]},{"name":"National Institutes of Health","award":["DK102233"],"award-info":[{"award-number":["DK102233"]}]},{"name":"National Institutes of Health","award":["#905770"],"award-info":[{"award-number":["#905770"]}]},{"name":"American Heart Association","award":["DK067912"],"award-info":[{"award-number":["DK067912"]}]},{"name":"American Heart Association","award":["DK112917"],"award-info":[{"award-number":["DK112917"]}]},{"name":"American Heart Association","award":["DK102233"],"award-info":[{"award-number":["DK102233"]}]},{"name":"American Heart Association","award":["#905770"],"award-info":[{"award-number":["#905770"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antioxidants"],"abstract":"<jats:p>The p21-activated kinase 1 (PAK1) is required for insulin-stimulated glucose uptake in skeletal muscle cells. However, whether PAK1 regulates skeletal muscle mitochondrial function, which is a central determinant of insulin sensitivity, is unknown. Here, the effect of modulating PAK1 levels (knockdown via siRNA, overexpression via adenoviral transduction, and\/or inhibition of activation via IPA3) on mitochondrial function was assessed in normal and\/or insulin-resistant rat L6.GLUT4myc and human muscle (LHCN-M2) myotubes. Human type 2 diabetes (T2D) and non-diabetic (ND) skeletal muscle samples were also used for validation of the identified signaling elements. PAK1 depletion in myotubes decreased mitochondrial copy number, respiration, altered mitochondrial structure, downregulated PGC1\u03b1 (a core regulator of mitochondrial biogenesis and oxidative metabolism) and PGC1\u03b1 activators, p38 mitogen-activated protein kinase (p38MAPK) and activating transcription factor 2 (ATF2). PAK1 enrichment in insulin-resistant myotubes improved mitochondrial function and rescued PGC1\u03b1 expression levels. Activated PAK1 was localized to the cytoplasm, and PAK1 enrichment concurrent with p38MAPK inhibition did not increase PGC1\u03b1 levels. PAK1 inhibition and enrichment also modified nuclear phosphorylated-ATF2 levels. T2D human samples showed a deficit for PGC1\u03b1, and PAK1 depletion in LHCN-M2 cells led to reduced mitochondrial respiration. Overall, the results suggest that PAK1 regulates muscle mitochondrial function upstream of the p38MAPK\/ATF2\/PGC1\u03b1-axis pathway.<\/jats:p>","DOI":"10.3390\/antiox12091658","type":"journal-article","created":{"date-parts":[[2023,8,23]],"date-time":"2023-08-23T07:25:24Z","timestamp":1692775524000},"page":"1658","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Toward Ameliorating Insulin Resistance: Targeting a Novel PAK1 Signaling Pathway Required for Skeletal Muscle Mitochondrial Function"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9724-5578","authenticated-orcid":false,"given":"Rekha","family":"Balakrishnan","sequence":"first","affiliation":[{"name":"Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope Beckman Research Institute, 1500 E Duarte Road, Duarte, CA 91010, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo A.","family":"Garcia","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope Beckman Research Institute, 1500 E Duarte Road, Duarte, CA 91010, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajakrishnan","family":"Veluthakal","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope Beckman Research Institute, 1500 E Duarte Road, Duarte, CA 91010, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janice M.","family":"Huss","sequence":"additional","affiliation":[{"name":"School of Medicine, Washington University, 660 S Euclid Ave, St. Louis, MO 63110, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph M.","family":"Hoolachan","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope Beckman Research Institute, 1500 E Duarte Road, Duarte, CA 91010, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debbie C.","family":"Thurmond","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope Beckman Research Institute, 1500 E Duarte Road, Duarte, CA 91010, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"88","DOI":"10.1038\/nrendo.2017.151","article-title":"Global aetiology and epidemiology of type 2 diabetes mellitus and its complications","volume":"14","author":"Zheng","year":"2018","journal-title":"Nat. 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