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Klotho has renoprotective effect and its expression is commonly suppressed in CKD patients. We showed that chronic hypoxia in unilateral ureteral obstruction model mice is associated with renal Klotho promoter methylation and expression silencing. Administration of low\u2010dose of sodium hydrosulfide (NaHS) effectively ameliorated renal tubulointerstitial fibrosis in the mouse model by demethylating Klotho promoter and restoring its expression. Mechanistically, hypoxia microenvironment in CKD reduced cellular oxygen availability and Fe\n                    <jats:sup>2+<\/jats:sup>\n                    concentration, and led to impaired activity of ten\u2010eleven translocation (TET), which is critical in maintaining Klotho promoter demethylation status. NaHS treatment greatly improved hypoxia condition, restored TET activity, reversed DNA methylation, and thus, increased Klotho expression. Our results strongly suggested that correcting hypoxia condition to restore TET activity could be a promising therapeutic strategy against CKD.\n                  <\/jats:p>","DOI":"10.1096\/fj.201902957rr","type":"journal-article","created":{"date-parts":[[2020,7,30]],"date-time":"2020-07-30T23:34:22Z","timestamp":1596152062000},"page":"11474-11487","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Hydrogen sulfide attenuates renal fibrosis by inducing TET\u2010dependent DNA demethylation on Klotho promoter"],"prefix":"10.1096","volume":"34","author":[{"given":"Yulu","family":"Gu","sequence":"first","affiliation":[{"name":"Department of Nephrology Zhongshan Hospital Fudan University Shanghai China"},{"name":"Shanghai Key Laboratory of Kidney and Blood Purification Shanghai 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