RT Journal Article SR Electronic(1) A1 Tiwari, Vaibhav A1 Shukla, DeepakYR 2010 T1 Phosphoinositide 3 kinase signalling may affect multiple steps during herpes simplex virus type-1 entry JF Journal of General Virology, VO 91 IS 12 SP 3002 OP 3009 DO https://doi.org/10.1099/vir.0.024166-0 PB Microbiology Society, SN 1465-2099, AB Early interactions of herpes simplex virus type-1 (HSV-1) with cells lead to cytoskeletal changes facilitating filopodia formation and membrane fusion. Here, we demonstrate that phosphoinositide 3 kinase (PI3K) signalling may affect multiple steps during HSV-1 entry. An inhibitor of PI3K (LY294002) blocked HSV-1 entry and the blockage was cell-type- and gD receptor-independent. Entry inhibition was also observed with primary cultures of the human corneal fibroblasts and unrelated β- and γ-herpesviruses. Immunofluorescence analysis demonstrated that LY294002 negatively affected HSV-1-induced filopodia formation. Similar effects of the inhibitor were seen on HSV-1 glycoprotein-induced cell-to-cell fusion. Cells expressing HSV-1 glycoproteins (gB, gD, gH and gL) showed significantly less fusion with target cells in the presence of the inhibitor. Expression of a dominant-negative PI3K mutant negatively affected both entry and fusion. We also show that inhibition of PI3K signalling also affected RhoA activation required for HSV-1 entry into certain cell types., UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/vir.0.024166-0