{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T01:55:20Z","timestamp":1790646920724,"version":"4.1.0"},"posted":{"date-parts":[[2026,9,25]]},"group-title":"Bioengineering","reference-count":86,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T00:00:00Z","timestamp":1790294400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,9,25]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>Arteries are among the first tissues to exhibit age-related dysfunction, yet the metabolic mechanisms driving vascular senescence remain poorly understood. Here, analysis of human aortic transcriptomic data identified HCAR1, encoding the lactate receptor GPR81, as one of the genes most significantly downregulated with age. We therefore investigated whether age-associated loss of GPR81 contributes to cellular senescence within the vessel wall. Senescent human endothelial cells and vascular smooth muscle cells accumulated neutral and oxidized lipids and exhibited increased labile iron and ferroptosis. Silencing GPR81 in early-passage cells recapitulated this metabolic phenotype together with multiple hallmarks of cellular senescence. Moreover, endothelial-specific deletion of GPR81 in young mice was sufficient to induce senescent cell accumulation, impaired lipid homeostasis, endothelial dysfunction, and elastin disorganization. Conversely, pharmacological activation of GPR81 with the agonist CHBA restored fatty acid metabolism, promoted glycolytic reprogramming, and attenuated ferroptotic stress and senescence-associated phenotypes. In lamin A knock-in (LAKI) progeroid mice, CHBA reduced arterial lipid accumulation and cellular senescence, shifted vascular cell composition toward a youthful state, improved endothelial integrity, and restored extracellular matrix homeostasis. Together, these findings identify age-associated loss of GPR81 as a driver of vascular metabolic dysfunction and cellular senescence and establish pharmacological GPR81 activation as a promising therapeutic strategy for preserving vascular homeostasis and mitigating age-associated cardiovascular disease.<\/jats:p>","DOI":"10.64898\/2026.09.20.753049","type":"posted-content","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T23:40:15Z","timestamp":1790379615000},"source":"Crossref","is-referenced-by-count":0,"title":["Lactate Receptor Activation Alleviates Senescence and Preserves Homeostasis of Aged Arteries"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-4039-0356","authenticated-orcid":false,"given":"Yulun","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hamsa Vardini","family":"Senthil Kumar","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sai Harsha","family":"Bhamidipati","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haibo","family":"Yu","sequence":"additional","affiliation":[{"name":"Shanghai Key Laboratory of Metabolic Remodeling and Health, Institute of Metabolism and Integrative Biology, Shanghai, 200438, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pihu","family":"Mehrotra","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA"},{"name":"Department of Chemical and Biological Engineering, Princeton, NJ 08544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedro","family":"Lei","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arundhati","family":"Das","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Saari","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, 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