Role of MAPK in TNFα-induced inhibition of hTERT in KG1 cells. KG1 cells were treated or not with TNFα for 15 to 120 minutes after overnight serum deprivation. MAPK expression was evaluated by Western blot analysis as described in “Materials and methods.” (A) Phospho-p42/44 ERK and p42/44 ERK expression. FCS was used as positive control. (B) Phospho-p46/54 JNK and p46/54 JNK expression. (C) Phospho-p38 and p38 expression. (D) Phospho-MAPKAPK-2 and MAPKAPK-2 expression.