Yan Guo1, Li Zhang2, Feng Li2, Chang-Ping Hu3, Zheng Zhang4. 1. Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China; Department of Pharmacy, Taoyuan Hospital, Taoyuan, Hunan 415700, China. 2. Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China. 3. Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China. Electronic address: huchangping@yahoo.com. 4. Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China; Hunan Provincial Key Laboratory of Cardiovascular Research, Central South University, Changsha, Hunan 410078, China. Electronic address: zzhang@csu.edu.cn.