1887

Abstract

The multifunctional V protein of human parainfluenza virus type 2 (hPIV2) plays important roles in controlling viral genome replication, inhibiting the host interferon response and promoting virus growth. We screened a yeast two-hybrid library using V protein as bait to identify host factors that are important for other functions of V. One of several positive clones isolated from HeLa cell-derived cDNA library encodes caspase-1. We found that the C-terminal region of V interacts with the C-terminal region of caspase-1 in mammalian cells. Moreover, the V protein repressed caspase-1 activity and the formation of interleukin-1β (IL-1β) in a dose-dependent manner. IL-1β secretion induced by wild-type hPIV2 infection in human monocytic THP-1 cells was significantly lower than that induced by recombinant hPIV2 lacking V protein or having a mutant V. These data suggest that hPIV2 V protein inhibits caspase-1-mediated maturation of IL-1β via its interaction with caspase-1.

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2018-04-01
2020-01-29
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