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Mice lacking P2Y 2 receptors have salt‐resistant hypertension and facilitated renal Na + and water reabsorption
Author(s) -
Rieg Timo,
Bundey Richard A.,
Chen Yu,
Deschenes George,
Junger Wolfgang,
Insel Paul A.,
Vallon Volker
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.07-8807com
Subject(s) - endocrinology , reabsorption , medicine , aldosterone , renal sodium reabsorption , receptor , chemistry , kidney , knockout mouse , vasopressin , plasma renin activity , epithelial sodium channel , renal physiology , angiotensin ii , renin–angiotensin system , blood pressure , biology , sodium , organic chemistry
ABSTRACT Extracellular nucleotides (e.g. , ATP) regulate many physiological and pathophysiological pro‐cesses through activation of nucleotide (P2) receptors in the plasma membrane. Here we report that gene‐targeted (knockout) mice that lack P2Y 2 receptors have salt‐resistant arterial hypertension in association with an inverse relationship between salt intake and heart rate, indicating intact baroreceptor function. Knockout mice have multiple alterations in their handling of salt and water: these include suppressed plasma renin and aldo‐sterone concentrations, lower renal expression of the aldosterone‐induced epithelial sodium channel α‐ENaC, greater medullary expression of the Na‐K‐2Cl‐cotrans‐porter NKCC2, and greater furosemide‐sensitive Na + reabsorption in association with greater renal medullary expression of aquaporin‐2 and vasopressin‐depen‐dent renal cAMP formation and water reabsorption despite similar vasopressin levels compared with wild type. Of note, smaller increases in plasma aldosterone were required to adapt renal Na + excretion to restricted intake in knockout mice, suggesting a facilitation in renal Na + retention. The results thus identify a previously unrecognized role for P2Y 2 receptors in blood pressure regulation that is linked to an inhibitory influence on renal Na + and water reabsorption. Based on these findings in knockout mice, we propose that a blunting in P2Y 2 receptor expression or activity is a new mechanism for salt‐resistant arterial hypertension.—Rieg, T., Bundey, R. A., Chen, Y., Deschenes, G., Junger, W., Insel, P. A., Vallon, V. Mice lacking P2Y2 receptors have salt‐resistant hypertension and facilitated renal Na+ and water reabsorption FASEB J. 21, 3717–3726 (2007)