Antimicrobial host defense peptides in an arteriviral infection: differential peptide expression and virus inactivation

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Show simple item record Sang, Yongming Ruchala, Piotr Lehrer, Robert I. Ross, Christopher R. Rowland, Raymond R. R. Blecha, Frank 2013-05-28T19:45:58Z 2013-05-28T19:45:58Z 2013-05-28
dc.description.abstract Antimicrobial host defense peptides (AHDPs) are effective against a wide range of microbes, including viruses. The arteriviral infection caused by porcine reproductive and respiratory syndrome virus (PRRSV) is a devastating pandemic that causes the most economically significant disease of swine. We sought to determine if the expression of AHDPs was influenced by infection with PRRSV, and if porcine AHDPs have direct antiviral activity against PRRSV. Because pulmonary alveolar macrophages (PAMs) are primary targets of PRRSV infection, gene expression of porcine AHDPs was evaluated in lungs from fetal and 2-wk-old congenitally infected pigs. In PRRSV-positive lungs and PAMs, gene expression of most porcine AHDPs showed little upregulation. However, gene expression of porcine β-defensin-1 (pBD-1), pBD-4, pBD-104, pBD-123, and pBD-125 were downregulated more than threefold in 2-wk-old congenitally infected pig lungs. Incubation of PRRSV with pBD-3 or PG-4 significantly inhibited viral infectivity in MARC-145 cells. Using nine protegrin or protegrin-derived peptides, we determined that a cyclic analog of PG-4 increased anti-PRRSV activity, and that substitution of phenylalanine with valine eliminated most PG-4 antiviral activity. In PAMs, pBD-3 and PG-4 at 5–40 μg/mL consistently suppressed PRRSV titers. Collectively, these findings suggest a potential role for some porcine AHDPs as innate antiviral effectors in PRRSV infection. Moreover, modulation of porcine innate immune mechanisms with AHDPs may be one means of limiting the impact of this costly pandemic viral disease. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.rights This is a copy of an article published in Viral Immunology © 2009 Mary Ann Liebert, Inc.; Viral Immunology is available online at: en_US
dc.subject Antimicrobial host defense peptides en_US
dc.subject Porcine reproductive and respiratory syndrome virus en_US
dc.title Antimicrobial host defense peptides in an arteriviral infection: differential peptide expression and virus inactivation en_US
dc.type Article (publisher version) en_US 2009 en_US
dc.citation.doi 10.1089/vim.2009.0005 en_US
dc.citation.epage 242 en_US
dc.citation.issue 4 en_US
dc.citation.jtitle Viral Immunology en_US
dc.citation.spage 235 en_US
dc.citation.volume 22 en_US
dc.contributor.authoreid ysang en_US
dc.contributor.authoreid ross4507 en_US
dc.contributor.authoreid rrowland en_US
dc.contributor.authoreid blecha en_US

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