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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Hypertension 2015 ; 65 (3): 569-76 Nephropedia Template TP
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RENAL TRANSPORTER ACTIVATION DURING ANGIOTENSIN II HYPERTENSION IS BLUNTED IN IFN-??/? AND IL-17A ?/? MICE #MMPMID25601932
Kamat NV; Thabet SR; Xiao L; Saleh MA; Kirabo A; Madhur MS; Delpire E; Harrison DG; McDonough AA
Hypertension 2015[Mar]; 65 (3): 569-76 PMID25601932show ga
Ample genetic and physiological evidence establishes that renal salt handling is a critical regulator of blood pressure. Studies also establish a role for the immune system, T-cell infiltration and immune cytokines in hypertension. This study aimed to connect immune cytokines, specifically IFN-? and IL-17A, to sodium transporter regulation in the kidney during angiotensin II (AngII) hypertension. C57BL/6J (wild type, WT) mice, responded to AngII infusion (490 ng/kg/min, 2 weeks) with a rise in blood pressure (to 170 mmHg) and a significant decrease in the rate of excretion of a saline challenge. In comparison, mice that lacked the ability to produce either IFN-? (IFN-??/?) or IL-17A (IL-17A?/?) exhibited a blunted rise in blood pressure (to <150 mmHg), and both genotypes maintained baseline diuretic and natriuretic responses to a saline challenge. Along the distal nephron, AngII infusion increased abundance of the phosphorylated forms of the Na-K-2Cl cotransporter, Na-Cl cotransporter and Ste20/SPS-1 related proline-alanine rich kinase, in both the WT and IL-17A?/? but not in IFN-??/? mice; epithelial Na channel abundance increased similarly in all three genotypes. In the proximal nephron, AngII infusion significantly decreased abundance of Na/H-exchanger isoform 3 and the motor myosin VI in IL-17A?/? and IFN-??/? , but not WT; the Na-phosphate cotransporter decreased in all three genotypes. Our results suggest that during AngII hypertension both IFN-? and IL-17A production interfere with the pressure natriuretic decrease in proximal tubule sodium transport and that IFN-? production is necessary to activate distal sodium reabsorption.