[Study on inhibition of coxsackievirus B3 infection in HeLa cell by short interfering RNA targeting 2B protein].
To study the inhibitory effect and function characteristics of small interfering RNA (siRNA) on cosxackievirus B3(CVB3) infection by RNA interference technique, siRNA-2B against the viral 2B region was synthesized and transfected into HeLa cell, which was then infected with CVB3. The efficiency of siRNA transfection was examined by FCM, the cell toxicity of siRNA-2B by MTT, and the antiviral ability of siRNA-2B by cytopathic effect (CPE), plaque reduction assay and RT-PCR. The results showed that siRNA-2B could be transfected efficiently into HeLa cell and lasted at least 48h. High concentration of siRNA-2B didn't show any sign of toxicity to cells. siRNA-2B exhibited a significant protective effect on cell viability by specific inhibition of viral replication. It showed a close relationship between the concentrations of siRNA-2B and the antiviral effects. siRNA-2B led to dramatical reduction of viral titers in supernatant of cell culture and weakened the reinfection ability of the virus. These data proposed that siRNA-2B, targeting 2B protein, can effectively inhibit CVB3 infection in HeLa cell and exhibits its transfection efficiency, viral inhibition specificity and adose-dependant manner, suggesting its potential role in prevention and treatement of CVB3 infection.