Figure 3.

Western blot analyses: phosphor-ERK and total-ERK in human oral cancer cell lines as compared with a primary culture of normal oral mucosa (HOK). Upregulation of phosphor-ERK (normalized to total-ERK) in OECM1 and Ca922 cell lines as compared with HOK, and a slightly decreased expression in SAS as compared with HOK. Results were quantified using densitometric analysis, normalized to the level of β-actin, and expressed as a fold change relative to the normal oral mucosa. Bars represent means ± standard deviation of the mean (∗P < 0.05). A representative result of three independent experiments is shown.