Berberine protects immortalized line of human melanocytes from HO-induced oxidative stress via activation of Nrf2 and Mitf signaling pathway.
J Dermatol Sci. 2019 Apr 2. Epub 2019 Apr 2. PMID: 30987854
BACKGROUND: Oxidative stress plays important roles in the pathogenesis of vitiligo. The removal of hydrogen peroxided (HO) has been established to be beneficial to vitiligo patients. Berberine (BBR), a natural isoquinoline alkaloid, has antioxidant activity, however, whether BBR can defend human melanocytes against oxidative injury remains to be elucidated.
OBJECTIVE: In the present study, we investigated the potential protective effect of BBR against oxidative stress on an immortalized normal human melanocyte cell line PIG1.
METHODS: Generally, PIG1 cells were pretreated with various concentrations of BBR for 1 h followed by exposure to 1.0 mM HOfor 24 h. Cell apoptosis, intracellular reactive oxygen species (ROS) levels were assessed through flow cytometry. Cell apoptosis, melanogenesis and the activation of Nrf2-ARE and Mitf signaling pathway were assayed.
RESULTS: Our results showed that cell viability rose and intracellular ROS generation, cell apoptosis of melanocytes decreased significantly in response to HOthrough pretreatment with BBR. Furthermore, We found that BBR can dramatically induce Nrf2 nuclear translocation, increase total Nrf2 levels and enhance ARE activity. Besides, Nrf2-siRNA transfection can abrogate the protection of BBR in melanocytes against oxidative injury. At last, we verified that BBR could facilitate melanogenesis function via modulation of Mitf and its target proteins.
CONCLUSION: The results above suggest that BBR can protect melanocytes against oxidative stress via its anti-oxidative activity. Also, we found HO-induced activation of NFκB was inhibited by BBR. Therefore, it is worthy of investigation BBR as a potential drug for treatment of vitiligo.