1. From the Departments of Pharmacology and Toxicology (C.Z., K.M.B., M.X., J.M.A., X.L., P.-L.L.) and Physiology and Biophysics (Q.L.), Medical College of Virginia, Virginia Commonwealth University, Richmond, VA; current address (C.Z.): Department of Nephrology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.