title: Porcine circovirus type 2 decreases the infection and replication of attenuated classical swine fever virus in porcine alveolar macrophages.
abstract: Recently, it has been noted that porcine circovirus type 2 (PCV2) infection adversely affects the protective efficacy of Lapinized Philippines Coronel (LPC) vaccine, an attenuated strain of classical swine fever virus (CSFV), in pigs. In order to investigate the possible mechanisms of the PCV2-derived interference, an in vitro model was established to study the interaction of LPC virus (LPCV) and PCV2 in porcine alveolar macrophages (AMs). The results showed that PCV2 reduced the LPCV infection in AMs and the levels of PCV2-derived interference were dose-dependent. The PCV2-derived interference also reduced the replication level of LPCV in AMs. The full-length PCV2 DNA and its fragment DNA C9 CpG-ODN were involved in the reduction of LPCV infection in AMs, whereas UV-inactivated PCV2 was not. In addition, a moderate negative correlation between the LPCV antigen-containing rate and IFN-γ production was observed, and had a dose-dependent trend with the level of PCV2-inoculation. The results of the present study may partially explain how PCV2 infection interferes with the efficacy of LPC vaccine.
authors.affiliation: Division of Hog Cholera Research, Animal Health Research Institute, Council of Agriculture, No. 376, Chung-Cheng Rd., Tansui District, New Taipei City 251, Taiwan.
authors.forename: Yu-Liang
authors.initials: YL
authors.lastname: Huang
authors.affiliation: Graduate Institute of Veterinary Medicine, School of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan; Graduate Institute of Molecular and Comparative Pathobiology, School of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan.
authors.forename: Victor Fei
authors.initials: VF
authors.lastname: Pang
authors.affiliation: Division of Hog Cholera Research, Animal Health Research Institute, Council of Agriculture, No. 376, Chung-Cheng Rd., Tansui District, New Taipei City 251, Taiwan.
authors.forename: Ming-Chung
authors.initials: MC
authors.lastname: Deng
authors.affiliation: Division of Hog Cholera Research, Animal Health Research Institute, Council of Agriculture, No. 376, Chung-Cheng Rd., Tansui District, New Taipei City 251, Taiwan.
authors.forename: Chia-Yi
authors.initials: CY
authors.lastname: Chang
authors.affiliation: Graduate Institute of Veterinary Medicine, School of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan; Graduate Institute of Molecular and Comparative Pathobiology, School of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan. Electronic address: crjeng@ntu.edu.tw.
authors.forename: Chian-Ren
authors.initials: CR
authors.lastname: Jeng
mesh_terms: D000818:Animals; D018173:Circoviridae Infections / Q000276:immunology / Q000662:veterinary* / Q000821:virology; D017925:Circovirus / Q000235:genetics / Q000276:immunology*; D006691:Classical Swine Fever / Q000276:immunology* / Q000517:prevention & control / Q000821:virology; D006692:Classical Swine Fever Virus / Q000276:immunology*; D016207:Cytokines / Q000276:immunology; D004306:Dose-Response Relationship, Immunologic; D016676:Macrophages, Alveolar / Q000276:immunology / Q000821:virology*; D009838:Oligodeoxyribonucleotides / Q000276:immunology; D012367:RNA, Viral / Q000737:chemistry / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D013047:Specific Pathogen-Free Organisms; D013552:Swine; D014765:Viral Vaccines / Q000276:immunology* / Q000592:standards; D014779:Virus Replication / Q000276:immunology
chemical_list: C408982:CPG-oligonucleotide; D016207:Cytokines; D009838:Oligodeoxyribonucleotides; D012367:RNA, Viral; D014765:Viral Vaccines
keywords: Alveolar macrophage; Classical swine fever virus; Lapinized Philippines Coronel; Porcine circovirus type 2