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PI3K-Akt Signaling and Viral Infection

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PI3K-Akt pathway is an important mechanism through which viral infection influences various cell functions. Activating PI3K-Akt signaling is a strategy employed by viruses to slow down apoptosis and prolong viral replication in both acute and persistent infection. It is also probable that prevention of cell death facilitates virus-induced carcinogenesis. Accumulating evidence suggests that the activity of PI3K or Akt is critical for survival of a few viruses. Adenovirus relies on PI3K-mediated organization of actin filament for active internalization. Non-segmented negativesense RNA viruses require Akt to enhance synthesis of viral RNAs. On the other hand, PI3K-Akt signaling is associated with up-regulating interferon response. Higher PI3K-Akt activity might impede viral propagation due to activation of cellular defenses. Influenza A virus is an interesting case which requires active PI3K for penetration despite the negative effects of inducing immune response. Unlike most viruses, it was reported that VP1 protein of foot-and-mouth disease virus inhibits Akt to promote cell death. These reports confirm the multiple roles of PI3K-Akt pathway in viral infection. Here, more new information on the interaction between PI3K-Akt signaling and viral infection is discussed.

Keywords: PI3K-Akt signaling; apoptosis; carcinogenesis; endocytosis; immune response; multiplication; viruses

Document Type: Research Article


Publication date: 2008-11-01

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