{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T03:02:50Z","timestamp":1792638170706,"version":"4.5.0"},"reference-count":98,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T00:00:00Z","timestamp":1776038400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Glucose transporter type 4 (GLUT4), encoded by the SLC2A4 gene, is the final effector of insulin-stimulated glucose uptake in insulin-sensitive tissues: skeletal muscle, adipose tissue, and cardiac muscle. Its dynamic localization, retained intracellularly under basal conditions and extensively translocated to the plasma membrane upon stimulation, makes it a master regulator of glycemic homeostasis. While the canonical insulin pathway (PI3K\/Akt\/TBC1D4) is the most potent and specific mechanism in the postprandial state, its dysfunction is centrally associated with insulin resistance and type 2 diabetes mellitus (T2DM). Crucially, robust alternative signaling networks function completely independently of insulin to regulate GLUT4 synthesis and translocation. Prominent among these are contraction-mediated pathways in skeletal muscle, which employ calcium signaling (via CaMKII), mechanical\/metabolic stress sensors (via p38 MAPK \u03b3\/\u03b4), and AMP-activated protein kinase (AMPK). This review critically integrates current knowledge, linking the molecular architecture and post-translational modifications of GLUT4 to the complex, tissue-specific signaling networks that govern its vesicular trafficking. We emphasize the hierarchy, redundancy, and interdependence of these pathways, highlighting differences between acute translocation and chronic transcriptional adaptations. Finally, we discuss how deciphering insulin-independent mechanisms offers promising therapeutic opportunities, particularly in identifying pharmacological targets that mimic the metabolic benefits of physical exercise.<\/jats:p>","DOI":"10.3390\/ijms27083475","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T10:19:14Z","timestamp":1776075554000},"page":"3475","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Canonical and Alternative Pathways (Insulin and Exercise) of GLUT4 Synthesis, Signaling, Intracellular Clustering, and Recruitment to the Plasma Membrane"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4347-6725","authenticated-orcid":false,"given":"Arnulfo","family":"Ramos-Jim\u00e9nez","sequence":"first","affiliation":[{"name":"Institute of Biomedical Sciences, Autonomous University of Ciudad Juarez, Ciudad Juarez Campus, Chihuahua 32310, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2998-9727","authenticated-orcid":false,"given":"Mariazel","family":"Rubio-Valles","sequence":"additional","affiliation":[{"name":"Faculty of Physical Culture Sciences, Autonomous University of Chihuahua, University Circuit, Campus II, Chihuahua 31125, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8760-9497","authenticated-orcid":false,"given":"Jaime","family":"Guereca-Arvizuo","sequence":"additional","affiliation":[{"name":"Institute of Biomedical Sciences, Autonomous University of Ciudad Juarez, Ciudad Juarez Campus, Chihuahua 32310, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco A.","family":"Ju\u00e1rez-Oropeza","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, School of Medicine, National Autonomous University of Mexico, Mexico City 04510, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-3085-852X","authenticated-orcid":false,"given":"Javier A.","family":"Ramos-Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Autonomous University of Nuevo Leon, Monterrey 64460, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isaac A.","family":"Ch\u00e1vez-Guevara","sequence":"additional","affiliation":[{"name":"Faculty of Sports Ensenada, Autonomous University of Baja California, Ensenada 22860, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0401-0073","authenticated-orcid":false,"given":"Everardo","family":"Gonz\u00e1lez-Rodr\u00edguez","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Biomedical Sciences, Autonomous University of Chihuahua, University Circuit, Campus II, Chihuahua 31109, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ver\u00f3nica","family":"Moreno-Brito","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Biomedical Sciences, Autonomous University of Chihuahua, University Circuit, Campus II, Chihuahua 31109, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1772-5836","authenticated-orcid":false,"given":"Rosa P.","family":"Hern\u00e1ndez Torres","sequence":"additional","affiliation":[{"name":"Faculty of Physical Culture Sciences, Autonomous University of Chihuahua, University Circuit, Campus II, Chihuahua 31125, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1128","DOI":"10.1210\/clinem\/dgae626","article-title":"Defining Continuous Glucose Monitor Time in Range in a Large, Community-Based Cohort Without Diabetes","volume":"110","author":"Spartano","year":"2025","journal-title":"J. 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