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It has been reported that urinary (U\u2010) FABP4 is associated with renal dysfunction and proteinuria in several glomerular kidney diseases. However, the clinical significance of U\u2010FABP4 in diabetic kidney disease (DKD) remains undetermined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Immunohistological analyses of FABP4 and FABP1 (liver\u2010type FABP), an established biomarker for impaired proximal tubules, were performed in the kidneys of patients with DKD and nonobese diabetic mice (KK\u2010Ta\/Akita mice). The associations between U\u2010FABP4 and U\u2010FABP1 with kidney function and metabolic indices were also investigated in patients with type 1 diabetes (<jats:italic>n<\/jats:italic>\u2009=\u200957, mean age: 61\u2009years) and patients with type 2 diabetes (<jats:italic>n<\/jats:italic>\u2009=\u2009608, mean age: 65\u2009years).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In both patients with diabetes and diabetic mice, FABP4 was expressed in injured glomeruli with increased markers of endoplasmic reticulum stress in addition to peritubular capillaries, whereas FABP1 was mainly expressed in proximal tubules. Levels of U\u2010FABP4 and U\u2010FABP1 were independently associated with each other, and both levels were independently associated with estimated glomerular filtration rate (eGFR) and urinary albumin\u2010to\u2010creatinine ratio (UACR) after adjustment of age, sex, type of diabetes, duration of diabetes, and systolic blood pressure in patients with diabetes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Urinary level of FABP4 derived from injured glomeruli with increased endoplasmic reticulum stress is independently associated with eGFR and UACR, suggesting a promising biomarker for glomerular damage in patients with diabetes.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jdi.14388","type":"journal-article","created":{"date-parts":[[2024,12,26]],"date-time":"2024-12-26T13:23:26Z","timestamp":1735219406000},"page":"670-679","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Urinary fatty acid\u2010binding protein 4 is a promising biomarker for glomerular damage in patients with diabetes mellitus"],"prefix":"10.1111","volume":"16","author":[{"given":"Marenao","family":"Tanaka","sequence":"first","affiliation":[{"name":"Department of Cardiovascular, Renal and Metabolic Medicine Sapporo Medical University School of Medicine  Sapporo Japan"},{"name":"Tanaka Medical Clinic  Yoichi Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7876-1772","authenticated-orcid":false,"given":"Tatsuya","family":"Sato","sequence":"additional","affiliation":[{"name":"Department of Cardiovascular, Renal and Metabolic Medicine Sapporo Medical University School of Medicine  Sapporo Japan"},{"name":"Department of Cellular Physiology and Signal Transduction Sapporo Medical University School of Medicine  Sapporo 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