Developmental and comparative immunology | 2019
Sp-CBL inhibits white spot syndrome virus replication by enhancing apoptosis in mud crab (Scylla paramamosain).
Abstract
In mammals, casitas B-lineage lymphoma (CBL) family proteins, a RING-type E3 ubiquitin ligase, are involved in many signal transduction pathways. However, the functions of CBL in invertebrates are not well elucidated. In this study, Sp-CBL containing CBL-N, CBL-2, CBL-3 and RING domains was identified in mud crab Scylla paramamosain. Sp-CBL was widely expressed in all tissues tested and found to be significantly up-regulated in the hemocytes of mud crab challenged by white spot syndrome virus (WSSV). The RNA interference of Sp-CBL increased the copy number of WSSV and declined the apoptosis rate of hemocytes. In addition, Sp-CBL could affect the activities of caspase 3 and the mitochondrial membrane potential. Taken together, the results of this study revealed that Sp-CBL could restrict WSSV proliferation through enhancing the apoptosis of the hemocytes, which would provide a novel insight into the anti-viral response in the innate immunity system of mud crab.