{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:35:16Z","timestamp":1787027716558,"version":"build-2736575974"},"reference-count":98,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,10,7]],"date-time":"2021-10-07T00:00:00Z","timestamp":1633564800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["DK116591"],"award-info":[{"award-number":["DK116591"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>Diabetic kidney is associated with an accumulation of extracellular matrix (ECM) leading to renal fibrosis. Dysregulation of retinoic acid metabolism involving retinoic acid receptors (RARs) and retinoid X receptors (RXRs) has been shown to play a crucial role in diabetic nephropathy (DN). Furthermore, RARs and peroxisome proliferator-activated receptor \u03b3 (PPAR\u03b3) are known to control the RXR-mediated transcriptional regulation of several target genes involved in DN. Recently, RAR and RXR have been shown to upregulate plasminogen activator inhibitor-1 (PAI-1), a major player involved in ECM accumulation and renal fibrosis during DN. Interestingly, hydrogen sulfide (H2S) has been shown to ameliorate adverse renal remodeling in DN. We investigated the role of RXR signaling in the ECM turnover in diabetic kidney, and whether H2S can mitigate ECM accumulation by modulating PPAR\/RAR-mediated RXR signaling. We used wild-type (C57BL\/6J), diabetic (C57BL\/6-Ins2Akita\/J) mice and mouse mesangial cells (MCs) as experimental models. GYY4137 was used as a H2S donor. Results showed that in diabetic kidney, the expression of PPAR\u03b3 was decreased, whereas upregulations of RXR\u03b1, RXR\u03b2, and RAR\u03b31 expression were observed. The changes were associated with elevated PAI-1, MMP-9 and MMP-13. In addition, the expressions of collagen IV, fibronectin and laminin were increased, whereas elastin expression was decreased in the diabetic kidney. Excessive collagen deposition was observed predominantly in the peri-glomerular and glomerular regions of the diabetic kidney. Immunohistochemical localization revealed elevated expression of fibronectin and laminin in the glomeruli of the diabetic kidney. GYY4137 reversed the pathological changes. Similar results were observed in in vitro experiments. In conclusion, our data suggest that RXR signaling plays a significant role in ECM turnover, and GYY4137 modulates PPAR\/RAR-mediated RXR signaling to ameliorate PAI-1-dependent adverse ECM turnover in DN.<\/jats:p>","DOI":"10.3390\/biom11101477","type":"journal-article","created":{"date-parts":[[2021,10,7]],"date-time":"2021-10-07T09:24:04Z","timestamp":1633598644000},"page":"1477","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["GYY4137 Regulates Extracellular Matrix Turnover in the Diabetic Kidney by Modulating Retinoid X Receptor Signaling"],"prefix":"10.3390","volume":"11","author":[{"given":"Subir Kumar","family":"Juin","sequence":"first","affiliation":[{"name":"Department of Physiology, University of Louisville School of Medicine, Louisville, KY 40202, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sathnur","family":"Pushpakumar","sequence":"additional","affiliation":[{"name":"Department of Physiology, University of Louisville School of Medicine, Louisville, KY 40202, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Utpal","family":"Sen","sequence":"additional","affiliation":[{"name":"Department of Physiology, University of Louisville School of Medicine, Louisville, KY 40202, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"F19","DOI":"10.1152\/ajprenal.00036.2012","article-title":"Aberrant production of extracellular matrix proteins and dysfunction in kidney endothelial cells with a short duration of diabetes","volume":"304","author":"Grutzmacher","year":"2013","journal-title":"Am. 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