title: Differential susceptibilities to BmNPV infection of two cell lines derived from the same silkworm ovarian tissues.
abstract: We previously established and characterized two insect cell lines (BmN-SWU1 and BmN-SWU2) from Bombyx mori ovaries. Here, we examined their differential susceptibilities to Bombyx mori nucleopolyhedrovirus (BmNPV) despite having originated from the same tissue source. BmN-SWU1 cells were susceptible and supported high titers of BmNPV replication, while BmN-SWU2 cells were resistant to BmNPV infection. Subcellular localization analysis demonstrated that very few BmNPV particles could be imported into BmN-SWU2 cells. However, initiation of BmNPV DNA replication but not amplification was detected in BmN-SWU2 cells after transfection with vA4prm-VP39-EGFP bacmid DNA. BmNPV transcription assays showed that late and very late but not early viral genes apparently were blocked in BmNSWU2 cells by unknown mechanisms. Further syncytium formation assays demonstrated that the BmNPV envelope fusion protein GP64 could not mediate BmN-SWU2 host cell-cell membrane fusion. Taken together, these results indicate that these two cell lines represent optimal tools for investigating host-virus interactions and insect antiviral mechanisms.
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China; Institute of Life Sciences, Chongqing Medical University, Chongqing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Chen
authors.affiliation: Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing, China.
authors.forename: Chun-Dong
authors.initials: CD
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: He
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Zhan-Qi
authors.initials: ZQ
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Ming-Ya
authors.initials: MY
authors.lastname: Cao
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Cai-Xia
authors.initials: CX
authors.lastname: Pan
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
authors.forename: Min-Hui
authors.initials: MH
authors.lastname: Pan
mesh_terms: D000818:Animals; D012831:Bombyx / Q000821:virology*; D002460:Cell Line; D004261:DNA Replication; D004279:DNA, Viral / Q000502:physiology; D005260:Female; D054884:Host-Pathogen Interactions; D017924:Nucleopolyhedroviruses / Q000472:pathogenicity* / Q000502:physiology; D010053:Ovary / Q000821:virology*; D014771:Virion / Q000378:metabolism
chemical_list: D004279:DNA, Viral