Lipopolysaccharide initiates a bypass feedback loop of epidermal growth factor receptor signaling by HPS70-induced COX-2 in H22 hepatocarcinoma cells.

LPS can induce TACE upregulation via signaling from TLR4-derived EGFR activation in tumor cells. The regulation and activity of TACE have been investigated with the observation that gene expression is upregulated in response to LPS followed by EGFR activation, however, the process remains poorly understood. In this study, we examined the effects of LPS on H22 hepatocarcinoma cells that displayed constitutively active TLR4 expression.