ATP2B1 encodes the plasma membrane calcium ATPase isoform 1(PMCA1), which is expressed in all tissues and plays a critical role in intracellular calcium homeostasis. We recently reported that vascular smooth muscle cell specific knockout of the ATP2B1 causes hypertension by increasing intracellular calcium (Hypertension, 2012), However, further studies are needed to understand the relationship between ATP2B1 and hypertension. Patients with essential Lumacaftor purchase hypertension have been reported to have higher levels of urinary calcium excretion. Therefore, to evaluate the role of ATP2B1 in kidney,

we used Cre-loxp technology to eliminate ATP2B1 genes from distal tubules. Methods: We generated mice with distal tubule specific knockout of the ATP2B1 by Cre-loxp technology using a kidney-specific cadherin promoter (Ksp). The male mice with homozygous for the floxed ATP2B1 and heterozygous for Ksp-Cre, were used as knockout mice(KO) in all studies. We have evaluated blood pressure, urine volume and osmolarity. Blood pressure was measured by tail-cuff method and telemetry method. we compared urine in basal condition and water restriction. Results: The

birth ratios were not different between KO and control mice. KO mice grow and increase Adriamycin their body weight as with control mice. Mortality rate of KO and control mice were not different. There were no significant differences in blood pressure between KO and controls mice measured by the tail–cuff and telemetry method. Under basal conditions, by the water deprivation or the vasopressin administration, urine volume was increased, and osmolarity was decreased in KO mice compared to control mice. Urine analysis indicated that KO mice exhibit hypercalciuria compared with control mice. Levels of aquaporin-2 protein in inner and outer medulla were significantly lower in KO mice compared with controls.

Conclusion: Deletion of ATP2B1 gene in distal tubules leads to hypercalciuria and polyuria without hypertension. TAKESHIGE YUI1, FUJISAWA YOSHIHIDE3, SUFIUN ABU1, RAHMAN ASADUR1, RAFIQ KAZI1, NAKANO DAISUKE1, OGATA HIROAKI2, NISHIYAMA AKIRA1 1Department of Pharmacology, 3Life Science Research Center, Faculty of Medicine, Kagawa University, Japan; 2Department of Internal Medicine, Showa University Northern Yokohama Hospital, Japan; 3Division of Baf-A1 mw Research Instrument and Equipment, Faculty of Medicine, Kagawa Univercity, Japan Introduction: Studies were performed to examine the effects of a sodium-glucose co-transporter 2 (SGLT2) inhibitor, empagliflozin, on blood pressure and urinary excretion of sodium in salt-treated metabolic syndrome rats. Methods: Sixteen-week-old obese Otsuka Long Evans Tokushima Fatty (OLETF) rats were treated with 1%NaCl (drinking water, n = 10) and vehicle (0.5% CMC, n = 10) or empagliflozin (10 mg/kg/day, p.o., n = 10) for 5 weeks. Blood pressure was continuously measured by telemetory system.