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Blue light activates phase 2 response proteins and slows growth of a431 epidermoid carcinoma xenografts.
MedLine Citation:
PMID:  25368229     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: Recent studies suggest that light in the UVA range (320-400 nm) activates signaling pathways that are anti-inflammatory, antioxidative and play a critical role in protection against cancer. These effects have been attributed to NF-E2-related factor (NRF2)-mediated up-regulation of 'phase 2' genes that neutralize oxidative stress and metabolize electrophiles. We had previously shown that small doses of blue light (400-500 nm) had selective toxicity for cultured oral tumor cells and increased levels of peroxiredoxin phase 2 proteins, which led to our hypothesis that blue light activates NRF2 signaling.
MATERIALS AND METHODS: A431 epidermoid carcinoma cells were treated in culture and as nude mouse xenografts with doses of blue light. Cell lysates and tumor samples were tested for NRF2 activation, and for markers of proliferation and oxidative stress.
RESULTS: Blue light activated the phase 2 response in cultured A431 cells and reduced their viability dose dependently. Light treatment of tumors reduced tumor growth, and levels of proliferating cell nuclear antigen (PCNA), and oxidized proteins.
DISCUSSION: Cellular responses to these light energies are worth further study and may provide therapeutic interventions for inflammation and cancer.
Authors:
Alpesh D Patel; Shaun Rotenberg; Regina L W Messer; John C Wataha; Kalu U E Ogbureke; Veronica V McCloud; Petra Lockwood; Stephen Hsu; Jill B Lewis
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Anticancer research     Volume:  34     ISSN:  1791-7530     ISO Abbreviation:  Anticancer Res.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8102988     Medline TA:  Anticancer Res     Country:  Greece    
Other Details:
Languages:  eng     Pagination:  6305-13     Citation Subset:  IM    
Copyright Information:
Copyright© 2014 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.
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