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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Renin+Angiotensin+Aldosterone+Syst 2015 ; 16 (4): 1135-48 Nephropedia Template TP
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Nuclear Expression of Renin-Angiotensin System Components in NRK-52E Renal Epithelial Cells #MMPMID24961503
Introduction: Isolated nuclei of sheep proximal tubules express angiotensin receptors as well as angiotensinogen (AGT) and renin. The present study characterized the NRK-52E tubular epithelial cell line for the intracellular expression of renin-angiotensin system (RAS) components. Methods: RAS components were visualized by immunofluorescent staining in intact cells and protein expression in isolate nuclei. Results: An antibody to the Ang I sequence of AGT (AI-AGT) revealed only cytosolic staining, while an antibody to an internal epitope of AGT (Int-AGT) revealed primarily nuclear staining. Immunoblots of nuclear and cytosolic fractions confirmed the differential cell staining of AGT. Immunostaining for renin was present on nuclei of intact cells. Nuclear renin activity averaged 0.77 ± 0.05 nmol/mg protein/hr that was reduced by aliskiren (0.13 ± 0.01 nmol/mg/hr, n=3, p<0.01); trypsin activation increased activity 3-fold. Peptide staining localized Ang II and Ang-(1?7) to the nucleus and peptide content averaged 59 ± 2 and 57 ± 22 fmol/mg (n=4), respectively. Peptide metabolism in isolated nuclei revealed the processing of Ang I to Ang-(1?7) by thimet oligopeptidase. Conclusion: We conclude that the NRK-52E cells express an intracellular RAS localized to the nucleus and may be an appropriate cell model to elucidate the functional relevance of this system.