Volume 41, Issue 10 pp. 1113-1120
ORIGINAL ARTICLE

Cyclosporine metabolic side effects: association with the WNK4 system

Semyon Melnikov

Semyon Melnikov

Laboratory of Biochemical Pharmacology

SM and HM contributed equally to the performance of this study.

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Haim Mayan

Haim Mayan

Department of Medicine E, Sheba Medical Center, Sackler School of Medicine, Tel Aviv University, Tel Hashomer, Israel

SM and HM contributed equally to the performance of this study.

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Shinichi Uchida

Shinichi Uchida

Department of Nephrology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan

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Eliezer J. Holtzman

Eliezer J. Holtzman

Laboratory of Molecular Nephrology, Sheba Medical Center, Sackler School of Medicine, Tel Aviv University, Tel Hashomer, Israel

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Zvi Farfel

Zvi Farfel

Department of Medicine E, Sheba Medical Center, Sackler School of Medicine, Tel Aviv University, Tel Hashomer, Israel

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First published: 24 March 2011
Citations: 52
Haim Mayan MD, Department of Medicine E, Sheba Medical Center, Tel Hashomer, Israel 52621, Tel.: 97235302437; fax: 97235302460; e-mail: [email protected]

Abstract

Eur J Clin Invest 2011; 41 (10): 1113–1120

Background Cyclosporine is used for treatment of transplanted patients and for immune-mediated diseases. Cyclosporine is known to cause a combination of metabolic side effects including hypertension, hyperkalemia, hypercalciuria and hypomagnesemia. These side effects except for hypomagnesemia are the cardinal features of familial hyperkalemia and hypertension (FHHt), also called pseudohypoaldosteronism type II (PHA II). FHHt is caused by mutations in the kinases WNK1 and WNK4 resulting in an increase in renal Na-Cl cotransporter (NCC) apical distribution and function. Therefore, we studied whether cyclosporine’s metabolic side effects are mediated by WNK4 and NCC.

Design Sprague-Dawley (SD) rats were treated by cyclosporine 25 mg kg−1 subcutaneously for 14 days. Blood pressure, blood chemistry values and kidney WNK4 protein were determined. In addition, mDCT cells were exposed to cyclosporine, and their WNK4 mRNA and protein content, and their NCC protein content and phosphorylation were determined.

Results The rats developed an FHHt-like syndrome including hypertension, hyperkalemia and salt-sensitive hypercalciuria. A significant increase in their kidney WNK4 protein content (0·13 ± 0·01 vs. 0·67 ± 0·16 WNK4/GAPDH in controls, P = 0·0183) was found. In mDCT cells, cyclosporine caused a rise in WNK4 mRNA levels and also a threefold rise in WNK4 protein content. This rise was followed by a rise in NCC protein content and pSer71 phosphorylation.

Conclusions These observations may explain in part the mechanism of cyclosporine-induced hypertension, hyperkalemia and hypercalciuria.

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