p38 activation is not sufficient to inhibit NMD.
a, levels of MKK6, both total p38α and phosphorylated p38 and HSP27 in RPE1 cells expressing LacZ or constitutively active MKK6-CA for 7 days. b, comparison of the levels of total p38α and phosphorylated p38 in RPE1 cells overexpressing either LacZ or MKK6-CA for 7 days with that in RPE cells treated with either H2O or bleomycin (Bleo) for 24 h, followed by 96-h recovery. c, ratios of CBR:CBG bioluminescence signals in RPE1 reporter cells expressing either LacZ or MKK6-CA for 7 days. Data represent the mean ± S.D. of three independent experiments. NS, p > 0.05 (paired t test).