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Signaling by extracellular nucleotides and P2 receptors plays an important role in renal pathophysiology, yet its contribution to fibroblast activation and fibrosis remains poorly understood. Here, we investigated the expression and function of G\n                    <jats:sub>q\/11<\/jats:sub>\n                    -coupled P2Y receptors in renal interstitial fibroblasts and their involvement in experimental kidney fibrosis. Using highly selective RNA in situ hybridization, we detected P2Y\n                    <jats:sub>1<\/jats:sub>\n                    (\n                    <jats:italic>P2ry1<\/jats:italic>\n                    ) and P2Y\n                    <jats:sub>6<\/jats:sub>\n                    (\n                    <jats:italic>P2ry6<\/jats:italic>\n                    ) receptor expression in interstitial fibroblasts. Notably, P2Y\n                    <jats:sub>6<\/jats:sub>\n                    expression was markedly upregulated in several experimental mouse models of renal fibrosis. Functional assays in primary cultured renal fibroblasts confirmed G\n                    <jats:sub>q\/11<\/jats:sub>\n                    -coupled P2Y receptor activity, as evidenced by transient intracellular Ca\u00b2\u207a elevations upon nucleotide stimulation. Primary cultured renal fibroblasts exhibited enhanced migration in response to extracellular uridine diphosphate (UDP). To assess the contribution of interstitial P2Y\n                    <jats:sub>6<\/jats:sub>\n                    receptors to fibrosis progression, we employed an adenine-induced nephropathy model with or without the selective P2Y\n                    <jats:sub>6<\/jats:sub>\n                    antagonist MRS2578. Pharmacological inhibition of P2Y\n                    <jats:sub>6<\/jats:sub>\n                    significantly reduced the mRNA expression of the myofibroblast marker \u03b1-smooth muscle actin and collagen I. Collectively, these findings suggest that upregulated P2Y\n                    <jats:sub>6<\/jats:sub>\n                    receptor signaling promotes the transition of resident interstitial cells into myofibroblasts during renal fibrosis, likely by modulating fibroblast migration. Inhibition of P2Y\n                    <jats:sub>6<\/jats:sub>\n                    signaling could represent a new strategy for reducing excessive renal fibrosis.\n                  <\/jats:p>","DOI":"10.1007\/s00424-026-03187-8","type":"journal-article","created":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T00:56:02Z","timestamp":1781657762000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Inhibition of (interstitial) P2Y6 receptors attenuates fibrosis progression"],"prefix":"10.1007","volume":"478","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3139-2904","authenticated-orcid":false,"given":"Lena Marie","family":"S\u00fc\u00df","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Petzendorfer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minh Linh","family":"Tran","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-5960-8231","authenticated-orcid":false,"given":"Bettina","family":"Firmke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anja","family":"S\u00fc\u00df","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6084-0659","authenticated-orcid":false,"given":"Richard","family":"Warth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5937-6756","authenticated-orcid":false,"given":"Katharina Anna-Elisabeth","family":"Broeker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8569-8588","authenticated-orcid":false,"given":"Anna-Lena","family":"Forst","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,17]]},"reference":[{"key":"3187_CR1","doi-asserted-by":"publisher","first-page":"129","DOI":"10.1038\/s41392-023-01379-7","volume":"8","author":"R Huang","year":"2023","unstructured":"Huang R, Fu P, Ma L (2023) Kidney fibrosis: from mechanisms to therapeutic medicines, Signal Transduct. 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