Toll-Like Receptor-2/6 and Toll-Like Receptor-9 Agonists Suppress Viral Replication but Not Airway Hyperreactivity in Guinea Pigs

作者：Drake Matthew G^*; Evans Scott E; Dickey Burton F; Fryer Allison D; Jacoby David B

来源：American Journal of Respiratory Cell and Molecular Biology, 2013, 48(6): 790-796.

DOI：10.1165/rcmb.2012-0498OC

• Toll-like receptor
• airway hyperreactivity
• muscarinic receptor
• parainfluenza virus

Respiratory virus infections cause airway hyperreactivity (AHR). Preventative strategies for virus-induced AHR remain limited. Toll-like receptors (TLRs) have been suggested as a therapeutic target because of their central role in triggering antiviral immune responses. Previous studies showed that concurrent treatment with TLR2/6 and TLR9 agonists reduced lethality and the microbial burden in murine models of bacterial and viral pneumonia. This study investigated the effects of TLR2/6 and TLR9 agonist pretreatment on parainfluenza virus pneumonia and virus-induced AHR in guinea pigs in vivo. Synthetic TLR2/6 lipopeptide agonist Pam(2)CSK(4) and Class C oligodeoxynucleotide TLR9 agonist ODN2395, administered in combination 24 hours before virus infection, significantly reduced viral replication in the lung. Despite a fivefold reduction in viral titers, concurrent TLR2/6 and TLR9 agonist pretreatment did not prevent virus-induced AHR or virus-induced inhibitory M2 muscarinic receptor dysfunction. Interestingly, the TLR agonists independently caused non-M2-dependent AHR. These data confirm the therapeutic antiviral potential of TLR agonists, while suggesting that virus inhibition may be insufficient to prevent virus-induced airway pathophysiology. Furthermore, TLR agonists independently cause AHR, albeit through a distinctly different mechanism from that of parainfluenza virus.

• 出版日期2013-6