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Claudin-1 is normally located in the Bowman\u2019s capsule, but its overexpression can reach the podocytes and lead to albuminuria. In the proximal tubule (PT), claudin-2 forms paracellular channels selective for water, Na+, K+, and Ca2+. Claudin-2 gene mutations are associated with hypercalciuria and kidney stones. Claudin-10 has two splice variants, -10a and -10b; Claudin-10a acts as an anion-selective channel in the PT, and claudin-10b functions as a cation-selective pore in the thick ascending limb (TAL). Claudin-16 and claudin-19 mediate paracellular transport of Na+, Ca2+, and Mg2+ in the TAL, where the expression of claudin-3\/16\/19 and claudin-10b are mutually exclusive. The claudin-16 or -19 mutation causes familial hypomagnesemia with hypercalciuria and nephrocalcinosis. Claudin- 14 polymorphisms have been linked to increased risk of hypercalciuria. Claudin-10b mutations produce HELIX syndrome, which encompasses hypohidrosis, electrolyte imbalance, lacrimal gland dysfunction, ichthyosis, and xerostomia. Hypercalciuria and magnesuria in metabolic acidosis are related to downregulation of PT and TAL claudins. In the TAL, stimulation of calcium-sensing receptors upregulates claudin-14 and negatively acts on the claudin-16\/19 complex. Claudin-3 acts as a general barrier to ions in the collecting duct. If this barrier is disturbed, urine acidification might be impaired. Claudin-7 forms a nonselective paracellular channel facilitating Cl\u2013 and Na+ reabsorption in the collecting ducts. Claudin-4 and -8 serve as anion channels and mediate paracellular Cl\u2013 transport; their upregulation may contribute to pseudohypoaldosteronism II and salt-sensitive hypertension.<\/jats:p>","DOI":"10.23876\/j.krcp.21.279","type":"journal-article","created":{"date-parts":[[2022,3,15]],"date-time":"2022-03-15T03:05:27Z","timestamp":1647313527000},"page":"275-287","update-policy":"https:\/\/doi.org\/10.23876\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Claudins in kidney health and disease"],"prefix":"10.23876","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6915-1806","authenticated-orcid":true,"given":"Chor 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