A Ca(2+)-dependent signalling circuit regulates influenza A virus internalization and infection.

Abstract:

:Various viruses enter host cells via endocytosis, but the molecular mechanisms underlying the specific internalization pathways remain unclear. Here we show that influenza A viruses (IAVs) enter cells via redundant pathways of clathrin-mediated and clathrin-independent endocytosis, with intracellular Ca(2+) having a central role in regulation of both pathways by activating a signalling axis comprising RhoA, Rho-kinase, phosphatidylinositol 4-phosphate 5-kinase (PIP5K) and phospholipase C (PLC). IAV infection induces oscillations in the cytosolic Ca(2+) concentration of host cells, the prevention of which markedly attenuates virus internalization and infection. The small GTPase RhoA is found both to function downstream of the virus-induced Ca(2+) response and itself to induce Ca(2+) oscillations in a manner dependent on Rho-kinase and subsequent PIP5K-PLC signalling. This signalling circuit regulates both clathrin-mediated and clathrin-independent endocytosis during virus infection and seems to constitute a key mechanism for regulation of IAV internalization and infection.

journal_name

Nat Commun

journal_title

Nature communications

authors

Fujioka Y,Tsuda M,Nanbo A,Hattori T,Sasaki J,Sasaki T,Miyazaki T,Ohba Y

doi

10.1038/ncomms3763

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2763

issn

2041-1723

pii

ncomms3763

journal_volume

4

pub_type

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