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Sci.","IJMS"],"abstract":"<jats:p>GLP-1RAs improve glycemia and body weight, but their effects extend beyond insulin secretion and appetite suppression. Experimental evidence indicates that GLP-1 receptor signaling can relieve lipotoxic stress by reducing lipid influx, restoring lipid trafficking, promoting cholesterol efflux, improving mitochondrial and endoplasmic reticulum homeostasis, and suppressing inflammatory and apoptotic signaling. In pancreatic beta cells, saturated fatty acids, oxidized low-density lipoprotein and excess free cholesterol disrupt membrane microdomains, insulin-granule trafficking, calcium signaling, autophagic flux and beta-cell identity. Preclinical studies with individual GLP-1RAs, principally exendin-4 and liraglutide, implicate cAMP\/PKA, PI3K\/Akt, ERK1\/2, AMPK, Nrf2 and autophagy-related pathways in these protective responses. A relevant mechanism is induction of ATP-binding cassette transporter A1 (ABCA1): exendin-4 stimulates ABCA1 transcription through the CaMKK\/CaMKIV\/PREB axis, linking incretin signaling to cholesterol export and preservation of glucose-stimulated insulin secretion. Recent work indicates spatially organized GLP-1R signaling at endoplasmic reticulum\u2013mitochondria contact sites. Preclinical genetic evidence in mouse metabolic dysfunction-associated steatohepatitis (MASH) models indicates that pericentral liver sinusoidal endothelial GLP-1 receptors contribute to weight-loss-independent semaglutide-mediated improvements in steatosis, fibrosis and immune remodeling; whether an analogous causal mechanism operates in human MASH remains unknown. This review integrates systemic nutrient unloading, beta-cell cholesterol homeostasis and intrahepatic endothelial signaling as complementary mechanisms of metabolic protection.<\/jats:p>","DOI":"10.3390\/ijms27188378","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T13:32:12Z","timestamp":1790083932000},"page":"8378","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["GLP-1 Receptor Agonists as Molecular Relievers of Lipotoxic Stress: From Pancreatic Beta-Cell Cholesterol Efflux to Systemic and Tissue-Specific Metabolic Protection"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8046-6756","authenticated-orcid":false,"given":"Wenyi","family":"Jiang","sequence":"first","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0012-5263","authenticated-orcid":false,"given":"Kensaku","family":"Fukunaga","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toshihiro","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-8909-9821","authenticated-orcid":false,"given":"Takanobu","family":"Saheki","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takafumi","family":"Yoshimura","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haotian","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-2998-2448","authenticated-orcid":false,"given":"Rathana","family":"Ly","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2179-5039","authenticated-orcid":false,"given":"Hitomi","family":"Imachi","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7335-7196","authenticated-orcid":false,"given":"Koji","family":"Murao","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki-cho, Kita-gun 761-0793, Kagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1802","DOI":"10.1172\/JCI29103","article-title":"Islet Beta Cell Failure in Type 2 Diabetes","volume":"116","author":"Prentki","year":"2006","journal-title":"J. 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