text: To confirm this novel mechanism of << bleomycin >>-induced fibrogenesis, we attempted to upregulate [[ Nrf2 ]] and related antioxidant proteins in bleomycin-treated fibroblasts using a putative Nrf2 activator, caffeic acid phenethyl ester, and the results showed that bleomycin-induced fibroblast proliferation and collagen content were attenuated through improved redox balance.