Inhibitory effect of peroxiredoxin II (Prx II) on Ras-ERK-NFκB pathway in mouse embryonic fibroblast (MEF) senescence

Intracellular reactive oxygen species (ROS) were attenuated by the expression of peroxiredoxin II (Prx II). Cellular senescence as judged by senescence-associated (SA)-beta-galactosidase (Gal) positive cell formation was increased in Prx II-deficient mouse embryonic fibroblast (MEF). Ras expression was increased following passages. The level of Ras expression was higher in Prx II-/-MEF than wild type MEF. ERK activity was also augmented by the deletion of Prx II. SA-beta-Gal-positive cell formation was reduced by PD98059, ERK inhibitor. Activated nuclear transcription factor, nuclear factor-kappaB (NF kappa B) by the deletion of Prx II was inhibited by the treatment with PD98059. In contrast, no changes in SA-beta-Gal-positive cell formation were detected by NF kappa B inhibitor, N-alpha-tosyl-L-phenylalanyl chloromethyl ketone (TPCK). Collectively, results suggest that Prx II deletion activate Ras-ERK-NF kappa B pathways and cellular senescence in Prx II-/- MEF cells was mediated by ERK activation but not by NF kappa B activation.