Serum levels of inflammatory factors. ELISA assays showing changes in serum levels of IFN-α (A) and TNF-α (B). Both cytokines clearly increased after LPS administration, while no significant change was observed in LPEI/siRNA-EGFR, LPEI/siRNA-NEG or GS-administrated groups. All the results are shown as the mean±standard error of the mean. *P < 0.05.