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Autophagy inhibition sensitizes bladder cancer cells to the photodynamic effects of the novel photosensitizer chlorophyllin e4

Paper ID Volume ID Publish Year Pages File Format Full-Text
30079 44459 2014 10 PDF Available
Title
Autophagy inhibition sensitizes bladder cancer cells to the photodynamic effects of the novel photosensitizer chlorophyllin e4
Abstract

•We invent a novel and effective photosensitizer chlorophyllin e4 with cheaper synthesis cost.•We examine autophagic changes of the bladder cancer cells in response to e4-PDT.•Autophagy inhibition could enhance the photodynamic effects of chlorophyllin e4.

We previously developed a novel photosensitizer, chlorophyllin e4, and found that chlorophyllin e4 mediated-PDT could kill 5637 and T24 cells by inducing apoptotic cell death. Here, we further investigated the new mechanism of autophagy and determined its relevance to apoptosis in e4-PDT. We demonstrated that chlorophyllin e4 was located in both lysosome and mitochondria, and autophagy also occurred in bladder cancer cells upon e4-PDT. More importantly, autophagy played a pro-survival role, and its inhibition enhanced e4-PDT-associated apoptotic cell death because cells pretreated with the typical autophagy inhibitor either 3-methyladenine or Bafilomycin A1 exhibited much lower cell viability and higher apoptotic cell death. Thus, these data imply that the combination of PDT, when mediated by our new photosensitizer chlorophyllin e4, and an autophagy inhibitor might be a promising approach to the elimination of non-muscle invasive bladder cancer.

Keywords
NMIBC, non-muscle invasive bladder cancers; PDT, photodynamic therapy; 5-ALA, 5-Aminolevulinic acid; SDS, sodium dodecyl sulfate; TEM, transmission electron microscopy; 3-MA, 3-methyladenine; SEM, standard errors of the mean; AVO, acidic vesicular organel
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Autophagy inhibition sensitizes bladder cancer cells to the photodynamic effects of the novel photosensitizer chlorophyllin e4
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 133, 5 April 2014, Pages 1–10
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us