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  • Title: An essential role for RIG-I in toll-like receptor-stimulated phagocytosis.
    Author: Kong L, Sun L, Zhang H, Liu Q, Liu Y, Qin L, Shi G, Hu JH, Xu A, Sun YP, Li D, Shi YF, Zang JW, Zhu J, Chen Z, Wang ZG, Ge BX.
    Journal: Cell Host Microbe; 2009 Aug 20; 6(2):150-61. PubMed ID: 19683681.
    Abstract:
    Retinoic acid-inducible gene-I (RIG-I) plays an important role in antiviral response by recognizing double-stranded RNA. Here we demonstrate an unanticipated role of RIG-I in Toll-like receptor (TLR)-stimulated phagocytosis. Stimulation with lipopolysaccharide (LPS), a ligand of TLR4, induced the expression of RIG-I in macrophages. Depletion of RIG-I by RNAi or gene targeting inhibited the LPS-induced phagocytosis of bacteria. Cellular processes involved in phagocytosis, such as small GTPase Cdc42/Rac1 activation, actin polymerization, and actin-regulator Arp2/3 recruitment, were also impaired in RIG-I-deficient macrophages activated by LPS. Moreover, RIG-I(-/-) mice were found to be more susceptible to infection with Escherichia coli as compared to wild-type mice. Thus, the regulatory functions of RIG-I are strikingly broad, including a role not only in antiviral responses but in antibacterial responses as well.
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