Research Article The Effects of Brazilian Green Propolis against Excessive

Copyright © 2013 Hiromi Murase et al.This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Background. We investigated the effects of Brazilian green propolis and its constituents against white light- or UVA-induced cell damage inmouse retinal cone-cell line 661Wor human skin-derived fibroblast cells (NB1-RGB).Methods. Cell damage was induced by 3,000lx white light for 24 h or 4/10 J/cm2 UVA exposure. Cell viability was assessed by Hoechst33342 and propidium iodide staining or by tetrazolium salt (WST-8) cell viability assay. The radical scavenging activity of propolis induced by UVA irradiation in NB1-RGB cells was measured using a reactive-oxygen-species- (ROS-) sensitive probe CM-H 2 DCFDA. Moreover, the effects of propolis on theUVA-induced activation of p38 and extracellular signal-regulated kinase (ERK) were examined by immunoblotting. Results. Treatment with propolis and two dicaffeoylquinic acids significantly inhibited the decrease in cell viability induced by white light in 661W. Propolis and its constituents inhibited the decrease in cell viability induced by UVA in NB1-RGB. Moreover, propolis suppressed the intracellular ROS production by UVA irradiation. Propolis also inhibited the levels of phosphorylated-p38 and ERK by UVA irradiation. Conclusion. Brazilian green propolis may become amajor therapeutic candidate for the treatment of AMD and skin damage induced by UV irradiation. 1