Abstract
We previously reported that curcumin inhibited lung cancer A549 cells growth and promoted cell apoptosis in vitro. In this study, we further examined the apoptosis-related parameters, including lysosomal damage and cathepsin activation, in A549 cells exposed to curcumin. We found that curcumin caused lysosomal membrane permeabilization (LMP) and cytosolic relocation of cathepsin B (cath B) and cathepsin D (cath D). However, only Z-FA-fmk (a cath B inhibitor) but not pepstatin A (a cath D inhibitor) inhibited curcumin-induced cell apoptosis, mitochondrial membrane potential loss, and cytochrome c release. The antioxidant N-acetylcysteine and glutathione attenuated LMP, suggesting that lysosomal destabilization was dependent on the elevation of reactive oxygen species and which precedes mitochondrial dysfunction. These findings indicated a novel pathway for curcumin regulation of ROS-lysosomal–mitochondrial pathway and provided the key mechanism of regulation of LMP in cell apoptosis, which may be exploited for cancer treatment.
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Abbreviations
- JC-1,5,5′,6,6′-tetrachloro-1,1′,3,3′:
-
Tetraethylbenzi-midazolylcarbocyanineiodide
- ROS:
-
Reactive oxygen species
- MMP:
-
Mitochondrial membrane potential
- GSH:
-
Glutathione
- NAC:
-
N-acetylcysteine
- LMP:
-
Lysosomal membrane permeabilization
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Acknowledgments
This project supported by the Zhejiang Traditional Chinese Medicine Administration Bureau (Project: No. 2008CA077 and No. 2011ZA093) and the Funds of the Nan**g Command Health Speciality “122” Project (Funds: No. 342510001). We would like to thank Drs. Kedi Xu and Yingke Xu for their technical assistance and discussion.
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All the authors listed have seen the manuscript and approved to submit to your journal. We disclosed no conflicts of interest.
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Chen, QY., Shi, JG., Yao, QH. et al. Lysosomal membrane permeabilization is involved in curcumin-induced apoptosis of A549 lung carcinoma cells. Mol Cell Biochem 359, 389–398 (2012). https://doi.org/10.1007/s11010-011-1033-9
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DOI: https://doi.org/10.1007/s11010-011-1033-9