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Kidney Int. 2009 Jan;75(2):227-34. doi: 10.1038/ki.2008.487. Epub 2008 Sep 24.

Inhibition of JAK2 protects renal endothelial and epithelial cells from oxidative stress and cyclosporin A toxicity.

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Laboratorio de Nefrologia-Hipertension, Fundacion Jimenez Diaz-Capio, Universidad Autonoma, Madrid, Spain.


Cyclosporin A is an immunosuppressant drug widely used in solid organ transplantation, but it has nephrotoxic properties that promote oxidative stress. The JAK2/STAT pathway has been implicated in both cell protection and cell injury; therefore, we determined a role of JAK2 in oxidative stress-mediated renal cell injury using pathophysiologically relevant oxidative challenges. The AG490 JAK2 inhibitor and overexpression of a dominant negative JAK2 protein protected endothelial and renal epithelial cells in culture against peroxide, superoxide anion and cyclosporin A induced cell death while reducing intracellular oxidation in cells challenged with peroxide and cyclosporin A. The decrease in Bcl2 expression and caspase 3 activation, induced by oxidative stress, was prevented by AG490. In mouse models of ischemia/reperfusion and cyclosporin A nephrotoxicity, AG490 decreased peritubular capillary and tubular cell injury. Our study shows that JAK2 inhibition is a promising renoprotective strategy defending endothelial and tubular cells from cyclosporin A- and oxidative stress-induced death.

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