The protein was separated in SDS-PAGE system according to the instructions of the existing literature (14 (link)). The protein antibodies used were as follows: P-NF-κB antibody (diluted at 1:1000; Cell Signaling Technology, catalog number: 9936T), p-MAPK (ERK1/2) antibody (diluted at 1:1000, Cell Signaling Technology, catalog number: 5235LF), p-TLR4 antibody (diluted at 1:500; Abcam, catalog number: ab13556) and GADPH antibody (diluted at 1:1000 dilution; Abcam, catalog number: ab9485). Polyclonal goat anti-rabbit antibody (Cell Signaling Technology) was used as a secondary antibody (at room temperature for 2 h), which was imaged with ECL chemiluminescence reagent (Amersham) and detected by Western blot (Millipore).