Poliovirus receptor (PVR, CD155) is an immunoglobulin-like, transmembrane glycoprotein originally described as a mediator of poliovirus attachment to cells and later identified as important in adherens junction formation. Also known as nectin-like 5 (Necl-5), PVR binds nectin-3 and interacts with integrin αvβ3 and PDGFR to regulate integrin clustering and focal contact formation at the leading edge of migrating cells. Research studies demonstrate that PVR and nectin-3 regulate contact inhibition during cell motility and proliferation in transformed 3T3 cells. Additional research indicates that PVR (CD155, Necl-5) expression may play a role in invasiveness of lung adenocarcinoma. In the immune system, CD155 plays a role in natural killer (NK) cell-mediated cytotoxicity.
