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Background  The  Lonicera japonica  has been used as natural and healthy drink for its anti-inflammatory effect and pleasant odor in China and Taiwan.    Methods  2D electrophoresis was used to analyze the proteins involved in photoactivated  Lonicera japonica -induced CH27 cell apoptosis. The fluorescent dyes MitoTracker Red CMXRos, calcein AM and JC-1 were used to elucidate mitochondrial function. The protein expression was performed by Western blotting. Fluorescent image of endoplasmic reticulum was accomplished by using ER-Tracker Green. This study used fluorescent dye CM-H 2 DCFDA to detect intracellular generation of reactive oxygen species.    Results  The identified proteins can be classified into three major groups, which include proteins involved in mitochondrial function, cytoskeleton-related proteins and proteins associated with endoplasmic reticulum (ER) stress. Photoactivated  Lonicera japonica  caused a significant effect on the mitochondrial function and ER stress in CH27 cells. The reactive oxygen species producing was found to be involved in photoactivated  Lonicera japonica -induced CH27 cell apoptosis.    Conclusion  Mitochondria and endoplasmic reticulum are the integral targets in photoactivated  Lonicera japonica -induced CH27 cell apoptosis. We also demonstrated that ethyl acetate fraction of  Lonicera japonica  extracts caused photocytotoxicity in a dose-dependent manner in CH27 cells. This could explain the fact that the ethyl acetate fraction of  Lonicera japonica  extracts may contain compounds which exhibit the photosensitizing activity in CH27 cells.

Application of proteomics to identify the target molecules involved in Lonicera japonica-induced photokilling in human lung cancer CH27 cells