Document Detail

Depletion of PKM2 leads to impaired glycolysis and cell death in 2-demethoxy-2,3-ethylenediamino hypocrellin B-photoinduced A549 cells.
MedLine Citation:
PMID:  24792468     Owner:  NLM     Status:  Publisher    
2-Demethoxy-2,3-ethylenediamino hypocrellin B (EDAHB) is an efficient photosensitizer that mediates cancer cell apoptosis. In order to better understand the molecular mechanisms involved in its antitumour activity, we used proteomics technology to identify candidate targets in A549 cells using EDAHB-mediated photodynamic therapy (EDAHB-PDT). The protein profile changes between untreated and PDT-treated A549 cells were analysed using two-dimensional polyacrylamide gel electrophoresis (2-DE). Differentially expressed protein spots were identified using matrix-assisted laser desorption-time-of-flight (MALDI-TOF) mass spectrometry; and 15 differentially expressed proteins (over 2-fold, p<0.05) were identified in PDT-treated A549 cells compared with untreated cells. Among them, the expression of pyruvate kinase M2 (PKM2), a key enzyme involved in glycolysis, was found to be significantly decreased in A549 cells following EDAHB-PDT. Transient ectopic over-expression of PKM2 attenuated death of EDAHB-PDT-treated A549 cells, whereas knockdown of PKM2 expression by RNA interference increased the photocytotoxicity of EDAHB. Moreover, a decrease in lactate production was detected in PDT-treated A549 cells. These observations suggest that PKM2 plays an important role in the antitumour action of EDAHB-PDT; thus, it may be a potential molecular target to increase the efficacy of PDT in cancer therapy.
Zhixiang Zhou; Yanghua Liu; Mengnan Qin; Wang Sheng; Xiaoli Wang; Zelin Li; Rugang Zhong
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-4-2
Journal Detail:
Title:  Journal of photochemistry and photobiology. B, Biology     Volume:  134C     ISSN:  1873-2682     ISO Abbreviation:  J. Photochem. Photobiol. B, Biol.     Publication Date:  2014 Apr 
Date Detail:
Created Date:  2014-5-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804966     Medline TA:  J Photochem Photobiol B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-8     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier B.V. All rights reserved.
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