Abstract
In the present study, we investigated the signaling pathways implicated in the induction of apoptosis by two modified nucleosides, 5-phenylselenyl-methyl-2′-deoxyuridine (PhSe-T) and 5-methylselenyl-methyl-2′-deoxyuridine (MeSe-T), using human cancer cell lines. The induction of apoptosis was associated with proteolytic activation of caspase-3 and -9, PARP cleavage, and decreased levels of IAP family members, including c-IAP-1 and c-IAP-2, but had no effect on XIAP and survivin. PhSe-T and MeSe-T also enhanced the activities of caspase-2 and -8, Bid cleavage, and the conformational activation of Bax. Additionally, nucleoside derivative-induced apoptosis was inhibited by the selective inhibitors of caspase-2, -3, -8, and -9 and also by si-RNAs against caspase-2, -3, -8, and -9; however, inhibition of caspase-2 and -3 was more effective at preventing apoptosis than inhibition of caspase-8 and -9. Moreover, the inhibition of caspase-2 activation by the pharmacological inhibitor z-VDVAD-fmk or by the knockdown of protein expression using siRNA suppressed nucleoside derivative-induced caspase-3 activation, but not vice versa. PhSe-T and MeSe-T also induced a Δψm loss via a CsA-insensitive mechanism, ROS production, and DNA damage, including strand breaks. Moreover, ROS scavengers such as NAC, tiron, and quercetin inhibited nucleoside derivative-induced ROS generation and apoptosis by blocking the sequential activation of caspase-2 and -3, indicating the role of ROS in caspase-2-mediated apoptosis. Taken together, these results indicate that caspase-2 acts upstream of caspase-3 and that caspase-2 functions in response to DNA damage in both PhSe-T- and MeSe-T-induced apoptosis. Our results also suggest that ROS are critical regulators of the sequential activation of caspase-2 and -3 in nucleoside derivative-treated cancer cells.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CsA:
-
Cyclosporin A
- DAPI:
-
4′-6-Diamidino-2-phenylindole
- DiOC6:
-
3,3′-Dihexyloxacarbocyanine
- DSBs:
-
Double-strand breaks
- FACS:
-
Fluorescence-activated cell sorter
- IAP:
-
Inhibitors of apoptosis proteins
- LDH:
-
Lactate dehydrogenase
- MeSe-T:
-
5-Methylselenyl-methyl-2′-deoxyuridine
- MMP:
-
Mitochondrial membrane potential
- NAC:
-
N-acetylcysteine
- PhSe-T:
-
5-Phenylselenyl-methyl-2′-deoxyuridine
- PI:
-
Propidium iodide
- pNA:
-
p-Nitroanilide
- ROS:
-
Reactive oxygen species
- SCGE:
-
Single-cell gel electrophoresis
- SSBs:
-
Single-strand breaks
- tiron:
-
4,5-Dihydroxy-1,3-benzenedisulfonic acid
- z-DEVD-fmk:
-
N-benzyloxycarbonyl-Asp-Glu-Val-Asp-fmk
- z-IETD-fmk:
-
N-benzyloxycarbonyl-Ile-Glu-Thr-Asp-fmk
- z-LEHD-fmk:
-
N-benzyloxycarbonyl-Leu-Glu-His-Asp-fmk
- z-VDVAD-fmk:
-
N-benzyloxycarbonyl-Val-Asp-Val-Ala-Asp-fmk
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Acknowledgment
This study was supported by the National Nuclear R&D Program of the Ministry of Education, Science, and Technology (MEST) of the Republic of Korea.
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Kim, B.M., Rode, A.B., Han, E.J. et al. 5-Phenylselenyl- and 5-methylselenyl-methyl-2′-deoxyuridine induce oxidative stress, DNA damage, and caspase-2-dependent apoptosis in cancer cells. Apoptosis 17, 200–216 (2012). https://doi.org/10.1007/s10495-011-0665-2
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DOI: https://doi.org/10.1007/s10495-011-0665-2