RESUMO
<p><b>OBJECTIVE</b>To investigate the role of Wnt signaling pathway on paraquat (PQ)induced PC12 cells damage.</p><p><b>METHODS</b>Using PC12 cells, in this study CCK8 assay was used to detect the effect of cell viability. The cell apoptosis and cell cycle was detected by flow cytometry. The real-time polymerase chain reaction (RT-PCR) was used to measure the mRNA expression of Wnt pathway key genes including Fzd1, Dvl2 and β-catenin and downstream genes including Bax, Bcl2, Survivin, Cyclin D1 and C-myc.</p><p><b>RESULT</b>Compared with the control, PC12 cells viability in 50.00 and 100.00 µmol/L PQ treatment groups were obviously decreased, the cell cycle S phase arrest, and cell apoptosis increased (P<0.05). The 25.00, 50.00 and 100.00 µmol/L PQ treatment groups mRNA expression of Wnt pathway key genes including Fzd1, Dvl2 and β-catenin and downstream genes including apoptosis suppressor genes (Bcl-2 and survivin)and cyclin gene (Cyclin D1) were downregulated (P<0.05). The mRNA expression of pro-apoptosis gene (Bax) and cyclin gene (C-myc) were upregulated (P<0.05).</p><p><b>CONCLUSION</b>It suggested that PQ can activate Wnt pathway to regulate downsteam genes expression, resulting in PC12 cell cycle arrest and apoptosis.</p>