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Deprecated: Implicit conversion from float 334.4 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Clin+Chim+Acta 2013 ; 421 (ä): 236-42 Nephropedia Template TP
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A linear relationship between the ex-vivo sodium mediated expression of two sodium regulatory pathways as a surrogate marker of salt sensitivity of blood pressure in exfoliated human renal proximal tubule cells: The virtual renal biopsy #MMPMID23454474
Gildea JJ; Lahiff DT; Van Sciver RE; Weiss RS; Shah N; McGrath HE; Schoeffel CD; Jose PA; Carey RM; Felder RA
Clin Chim Acta 2013[Jun]; 421 (ä): 236-42 PMID23454474show ga
Background: Salt sensitivity (SS) of blood pressure (BP) affects 25% of adults, shares comorbidity with hypertension, and has no convenient diagnostic test. We tested the hypothesis that urine-derived exfoliated renal proximal tubule cells (RPTCs) could diagnose the degree of an individual's SS of BP. Methods: Subjects were selected who had their SS of BP determined 5 y prior to this study (salt-sensitive: ?7 mm Hg increase in mean arterial pressure (MAP) following transition from a random weekly diet of low (10 mmol/day) to high (300 mmol/day) sodium (Na+) intake, N = 4; inverse salt-sensitive (ISS): ?7 mm Hg increase in MAP transitioning from a high to low Na+ diet, N = 3, and salt-resistant (SR): <7 mm Hg change in MAP transitioned on either diet, N = 5). RPTC responses to 2 independent Na+ transport pathways were measured. Results: There was a negative correlation between the degree of SS and dopamine-1 receptor (D1R) plasma membrane recruitment (y = ?0.0107x + 0.68 relative fluorescent units (RFU), R2 = 0.88, N = 12, P < 0.0001) and angiotensin II-stimulated intracellular Ca++ (y = ?0.0016x + 0.0336, R2 = 0.7112, P < 0.001, N = 10) concentration over baseline. Conclusions: Isolating RPTCs from urine provides a personalized cell-based diagnostic test of SS index that offers advantages over a 2-week controlled diet with respect to cost and patient compliance. Furthermore, the linear relationship between the change in MAP and response to 2 Na+ regulatory pathways suggests that an individual's RPTC response to intracellular Na+ is personalized and predictive.