This work was supported by the National Natural Science Foundation of China ( 31670177 ), Foundation of Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control (No. 2014-5 ), Construct Program of the Key Discipline in Hunan Province (No. 2011–75 ), and the Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study ( 2015-351 ). We appreciate the technical assistance of Kang Zheng and Zhifeng Long (University of South China) during the histopathological analysis.