RESUMO
<p><b>OBJECTIVE</b>To investigate the effects of Newcastle disease virus (NDV) infection on the expression of survivin and cell cycle in human tongue squamous carcinoma TSCCa cells.</p><p><b>METHODS</b>The proliferation of TSCCa cells infected with NDV in vitro was evaluated by means of MTT assay, and survivin expression in the infected cells was detected using RT-PCR and Western blotting. Flow cytometry was performed to assess the changes in the cell apoptosis, cell cycle and cell proliferation index (PI) of the cells.</p><p><b>RESULTS</b>NDV infection resulted in decreased survivin expression and increased apoptosis of TSCCa cells, with reduced cell percentage in G2/M and S phases and lowered PI of the cells, showing significant differences from those of the negative control cells (P<0.05).</p><p><b>CONCLUSION</b>NDV infection can inhibit survivin expression, affect the cell cycle of TSCCa cells and induce their apoptosis.</p>