ABSTRACT
Purpose
To investigate the ability of chloroquine, a lysosomotropic autophagy inhibitor, to enhance the anticancer effect of nutrient deprivation.
Methods
Serum-deprived U251 glioma, B16 melanoma and L929 fibrosarcoma cells were treated with chloroquine in vitro. Cell viability was measured by crystal violet and MTT assay. Oxidative stress, apoptosis/necrosis and intracellular acidification were analyzed by flow cytometry. Cell morphology was examined by light and electron microscopy. Activation of AMP-activated protein kinase (AMPK) and autophagy were monitored by immunoblotting. RNA interference was used for AMPK and LC3b knockdown. The anticancer efficiency of intraperitoneal chloroquine in calorie-restricted mice was assessed using a B16 mouse melanoma model.
Results
Chloroquine rapidly killed serum-starved cancer cells in vitro. This effect was not mimicked by autophagy inhibitors or LC3b shRNA, indicating autophagy-independent mechanism. Chloroquine-induced lysosomal accumulation and oxidative stress, leading to mitochondrial depolarization, caspase activation and mixed apoptotic/necrotic cell death, were prevented by lysosomal acidification inhibitor bafilomycin. AMPK downregulation participated in chloroquine action, as AMPK activation reduced, and AMPK shRNA mimicked chloroquine toxicity. Chloroquine inhibited melanoma growth in calorie-restricted mice, causing lysosomal accumulation, mitochondrial disintegration and selective necrosis of tumor cells.
Conclusion
Combined treatment with chloroquine and calorie restriction might be useful in cancer therapy.
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Abbreviations
- AICAR:
-
5-aminoimidazole-4-carboxamide riboside
- AMPK:
-
AMP-activated protein kinase
- DHR:
-
dihydrorhodamine
- FCS:
-
fetal calf serum
- FITC:
-
fluorescein isothyocyanate
- LC3:
-
microtubule-associated protein 1 light-chain 3
- MEM:
-
Eagle’s Minimum Essential Medium
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- PBS:
-
phosphate buffered saline
- PI:
-
propidium iodide
- ROS:
-
reactive oxygen species
- shRNA:
-
short hairpin RNA
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ACKNOWLEDGMENTS & DISCLOSURES
The study was supported by the Ministry of Science and Technological Development of the Republic of Serbia (grants 173053 to LHT and 41025 to VT). Ljubica Harhaji-Trajkovic is a recipient of the UNESCO L’OREAL national scholarship program “For Women in Science” (contract number 403F). The authors declare that there are no conflicts of interest.
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Ljubica Harhaji-Trajkovic and Katarina Arsikin contributed equally to the work.
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Harhaji-Trajkovic, L., Arsikin, K., Kravic-Stevovic, T. et al. Chloroquine-Mediated Lysosomal Dysfunction Enhances the Anticancer Effect of Nutrient Deprivation. Pharm Res 29, 2249–2263 (2012). https://doi.org/10.1007/s11095-012-0753-1
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DOI: https://doi.org/10.1007/s11095-012-0753-1