{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T07:47:29Z","timestamp":1773733649096,"version":"3.50.1"},"reference-count":84,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T00:00:00Z","timestamp":1773360000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the National Key Clinical Specialty Discipline Construction Program of China","award":["2199000764"],"award-info":[{"award-number":["2199000764"]}]},{"name":"the Peking University Health Science Center International Institute of Comprehensive Health","award":["JKCJ202102"],"award-info":[{"award-number":["JKCJ202102"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The role of bile acid metabolism within the skeletal muscle microenvironment in sarcopenia remains unclear. This study investigated bile acid alterations and the function of the ATP Binding Cassette Subfamily B Member 1 (ABCB1) transporter in muscle microvascular endothelial cells (MMECs) during aging. Using a sarcopenic mouse model stratified by muscle density, we found elevated deoxycholic acid (DCA) and lithocholic acid (LCA) levels but reduced tauroursodeoxycholic acid (TUDCA) levels in muscle, correlating with downregulated ABCB1\/P-glycoprotein expression. In vitro, inhibition of ABCB1 in MMECs impaired bile acid efflux, promoted inflammation, and compromised endothelial health. Conditioned medium from these MMECs reduced the viability, proliferation, and differentiation of C2C12 myoblasts, downregulated myogenic factors, and increased atrophy markers. Furthermore, we identified miR-135a-5p as a direct upstream regulator of ABCB1 in MMECs, and demonstrated that it mediates bile acid efflux impairment and subsequent myoblast dysfunction. Our findings reveal a novel \u201cbile acid\u2013MMEC\u2013muscle\u201d axis in sarcopenia, where miR-135a-5p-mediated ABCB1 downregulation in MMECs disrupts the local bile acid milieu and impairs muscle regeneration, highlighting ABCB1 as a potential therapeutic target for aging-related muscle loss.<\/jats:p>","DOI":"10.3390\/ijms27062649","type":"journal-article","created":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T17:36:48Z","timestamp":1773423408000},"page":"2649","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Bile Acid Metabolism Affects Muscle Regeneration in Aging Skeletal Muscle in a Manner Associated with Regulation of ABCB1 Expression"],"prefix":"10.3390","volume":"27","author":[{"given":"Xiaoqing","family":"Wu","sequence":"first","affiliation":[{"name":"Gastroenterology Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2022-6512","authenticated-orcid":false,"given":"Yanan","family":"Wei","sequence":"additional","affiliation":[{"name":"Geriatric Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6371-9763","authenticated-orcid":false,"given":"Qian","family":"Xue","sequence":"additional","affiliation":[{"name":"Geriatric Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xia","family":"Li","sequence":"additional","affiliation":[{"name":"Geriatric Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lihua","family":"Deng","sequence":"additional","affiliation":[{"name":"Geriatric Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Menghan","family":"Li","sequence":"additional","affiliation":[{"name":"Geriatric Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yulan","family":"Liu","sequence":"additional","affiliation":[{"name":"Gastroenterology Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0878-2054","authenticated-orcid":false,"given":"Jingtong","family":"Wang","sequence":"additional","affiliation":[{"name":"Geriatric Department, Peking University People\u2019s Hospital, Beijing 100044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2636","DOI":"10.1016\/S0140-6736(19)31138-9","article-title":"Sarcopenia","volume":"393","author":"Sayer","year":"2019","journal-title":"Lancet"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"300","DOI":"10.1016\/j.jamda.2019.12.012","article-title":"Asian Working Group for Sarcopenia: 2019 Consensus Update on Sarcopenia Diagnosis and Treatment","volume":"21","author":"Chen","year":"2020","journal-title":"J. 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