{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T21:05:53Z","timestamp":1792098353341,"version":"4.4.0"},"reference-count":35,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2019,1,15]],"date-time":"2019-01-15T00:00:00Z","timestamp":1547510400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Counsil of Science and technology","award":["U.P (CST\/SERPD\/D- 5051)"],"award-info":[{"award-number":["U.P (CST\/SERPD\/D- 5051)"]}]},{"name":"Sanjay Gandhi PGI","award":["39\/392\/2015"],"award-info":[{"award-number":["39\/392\/2015"]}]},{"DOI":"10.13039\/501100001412","name":"Council of Scientific and Industrial Research","doi-asserted-by":"publisher","award":["09\/590\/(0156)\/2014"],"award-info":[{"award-number":["09\/590\/(0156)\/2014"]}],"id":[{"id":"10.13039\/501100001412","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001412","name":"Council of Scientific and Industrial Research","doi-asserted-by":"publisher","award":["09\/590\/(0159)\/2016"],"award-info":[{"award-number":["09\/590\/(0159)\/2016"]}],"id":[{"id":"10.13039\/501100001412","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Cellular Biochemistry"],"published-print":{"date-parts":[[2019,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The contribution of proximal tubules (PT) to albumin uptake is now well recognized, however, its regulation is understudied area. There are reports suggesting that insulin resistance is associated with the development of albuminuria in nondiabetic individuals. We have previously reported reduced insulin receptor (IR) expression in renal\u2010tubular\u2010epithelial cells, including PT in various models of insulin resistance. However, the effect of a physiological fall in insulin levels and the role for IR in PT in tubular albumin uptake is not clear. To address these gaps in our understanding, we estimated urine excretion and renal uptake of albumin in fasted and fed C57Bl\/6 mice injected with fluorescein isothiocyanate (FITC)\u2010albumin (5\u2009\u00b5g\/mL\/kg body weight, intraperitoneal, \n<jats:italic>n<\/jats:italic>\u2009=\u20096 per group). In addition, we compared spot urine analysis from 33 clinically healthy humans after overnight fasting (when insulin levels are lower than in the fed state) and then at 2\u2009hours after 75\u2009g oral glucose challenge (postprandial). Fasted mice had attenuated renal uptake of FITC\u2010albumin and higher excretion in urine, relative to fed mice (\n<jats:italic>P<\/jats:italic>\u2009=\u20090.04). Moreover, a significant drop in urine albumin\u2010to\u2010creatinine ratio (ACR) and urine albumin concentration (UAC) was observed in the postprandial state in these subjects (\n<jats:italic>P<\/jats:italic>\u2009=\u20090.001 and \n<jats:italic>P<\/jats:italic>\u2009=\u20090.017, for ACR and UAC, respectively). The drop was negatively associated with postprandial blood glucose levels (\u03c1\u2009=\u2009\u22120.36, \n<jats:italic>P<\/jats:italic>\u2009=\u20090.03 for \u0394UAC and \u03c1\u2009=\u2009\u22120.34, \n<jats:italic>P<\/jats:italic>\u2009=\u20090.05 for \u0394ACR). To test the role of IR in PT, we analyzed 24\u2010hour urine albumin excretion in male mice with targeted deletion of IR from PT (insulin receptor\u00a0knockout [IRKO]) and their wild\u2010type (WT) littermates (\n<jats:italic>n<\/jats:italic>\u2009=\u20097 per group). IRKO mice had significantly higher 24\u2010hour urine albumin excretion relative to WT. Moreover, kidneys from KO mice revealed reduced expression of megalin and cubulin proteins in the PT relative to the WT. We also demonstrated insulin (100\u2009nM) induced albumin internalization in human proximal tubule cells (hPT) and this effect of insulin was attenuated in hydroxy\u20102\u2010naphthalenylmethylphosphonic acid (100\u2009\u00b5M), a tyrosine kinase inhibitor, pretreated hPT. Our findings revealed albumin excretion was attenuated by glucose administration to fasting individuals implying a regulatory role for insulin in PT albumin reabsorption. Thus albuminuria associated with insulin resistance\/diabetes may relate not only to glomerular dysfunction but also to impairment in insulin\u2010mediated reabsorption.<\/jats:p>","DOI":"10.1002\/jcb.28359","type":"journal-article","created":{"date-parts":[[2019,1,15]],"date-time":"2019-01-15T11:00:58Z","timestamp":1547550058000},"page":"10688-10696","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Deletion of insulin receptor in the proximal tubule and fasting augment albumin excretion"],"prefix":"10.1002","volume":"120","author":[{"given":"Manju","family":"Kumari","sequence":"first","affiliation":[{"name":"Department of Molecular Medicine and Biotechnology Sanjay Gandhi Postgraduate Institute of Medical Sciences Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajni","family":"Sharma","sequence":"additional","affiliation":[{"name":"Department of Molecular Medicine and Biotechnology Sanjay Gandhi Postgraduate Institute of Medical Sciences Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaurav","family":"Pandey","sequence":"additional","affiliation":[{"name":"Department of Molecular Medicine and Biotechnology Sanjay Gandhi Postgraduate Institute of Medical Sciences Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolyn M.","family":"Ecelbarger","sequence":"additional","affiliation":[{"name":"Department of Medicine Division of Endocrinology and Metabolism, Georgetown University Washington District of Columbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prabhaker","family":"Mishra","sequence":"additional","affiliation":[{"name":"Department of Biostatistics and Health Informatics Sanjay Gandhi Postgraduate Institute of Medical Sciences Lucknow 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