Abstract
Resveratrol (RV), a natural plant polyphenol widely present in foods such as grapes, wine, and peanuts, has an ability to inhibit various stages of carcinogenesis in vitro and in vivo. In this report, we explored the roles of intrinsic and extrinsic apoptotic pathways during RV-induced apoptosis in human lung adenocarcinoma (ASTC-a-1) cells. After exposure of cells to different concentrations of RV, we found that RV induced concentration-dependent apoptosis. Fluorometric substrates assay and western blotting (WB) analysis showed that caspase-8 was not activated, which was further verified by monitoring the cleavage of Bid to tBid using fluorescence resonance energy transfer (FRET) microscopy imaging inside single living cells, indicating that extrinsic apoptotic pathway was not involved in RV-induced apoptosis. In addition, inhibition of caspases-3 or -9 but not caspase-8 using the specific inhibitors of caspases modestly but significantly attenuated RV-induced apoptosis. Moreover, flow cytometry (FCM) analysis showed that RV treatment induced time-dependent loss of mitochondrial membrane potential (∆ψm), in combination with the activation of caspases-3 and -9; we therefore concluded that RV-induced apoptosis involved the intrinsic apoptotic pathway. It is noteworthy that RV treatment induced translocation of AIF from mitochondria to nucleus in a time dependent manner, and that knockdown of AIF remarkably attenuated RV-induced apoptosis. Collectively, our findings demonstrate that RV induces caspase-8-independent apoptosis via AIF and to a lesser extent caspase-9-dependent mitochondrial pathway in ASTC-a-1 cells.
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Abbreviations
- AIF:
-
Apoptosis-inducing factor
- CCK-8:
-
Cell Counting Kit
- Endo G:
-
Endonuclease G
- FCM:
-
Flow cytometry
- FRET:
-
Fluorescence resonance energy transfer
- HtrA2/Omi:
-
High temperature requirement protein A2
- Rho123:
-
Rhodamine123
- RV:
-
Resveratrol
- Smac/Diablo:
-
Second mitochondrial activator of caspases
- STS:
-
Staurosporine
- ΔΨm :
-
Mitochondrial membrane potential
- ECFP:
-
Enhanced cyan fluorescent protein
- Venus:
-
A mutant of yellow fluorescent protein (YFP)
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (Grant Nos. 31071218 and 81071491).
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Zhang, W., Wang, X. & Chen, T. Resveratrol induces mitochondria-mediated AIF and to a lesser extent caspase-9-dependent apoptosis in human lung adenocarcinoma ASTC-a-1 cells. Mol Cell Biochem 354, 29–37 (2011). https://doi.org/10.1007/s11010-011-0802-9
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DOI: https://doi.org/10.1007/s11010-011-0802-9