Abstract
Ultrasound combined with endogenous protoporphyrin IX derived from 5-aminolevulinic acid (ALA-SDT) is known to induce apoptosis in multiple cancer cells and macrophages. Persistent retention of macrophages in the plaque has been implicated in the pathophysiology and progression of atherosclerosis. Here we investigated the effects of inhibition of voltage-dependent anion channel 1 (VDAC1) on ALA-SDT-induced THP-1 macrophages apoptosis. Cells were pre-treated with VDAC1 inhibitor 4,4′-diisothiocyanostilbene-2,2′-disulfonic acid (DIDS) disodium salt for 1 h or downregulated VDAC1 expression by small interfering RNA and exposed to ultrasound. Cell viability was assessed by MTT assay, and cell apoptosis along with necrosis was evaluated by Hoechst 33342/propidium iodide staining and flow cytometry. Levels of cytochrome c release was assessed by confocal microscope and Western blot. The levels of full length caspases, caspase activation, and VDAC isoforms were analyzed by Western blot. Intracellular reactive oxygen species generation, mitochondrial membrane permeability, and intracellular Ca2+ [Ca2+]i levels were measured with fluorescent probes. We confirmed that the pharmacological inhibition of VDAC1 by DIDS notably prevented ALA-SDT-induced cell apoptosis in THP-1 macrophages. Additionally, DIDS significantly inhibited intracellular ROS generation and apoptotic biochemical changes such as inner mitochondrial membrane permeabilization, loss of mitochondrial membrane potential, cytochrome c release and activation of caspase-3 and caspase-9. Moreover, ALA-SDT elevated the [Ca2+]i levels and it was also notably reduced by DIDS. Furthermore, both of intracellular ROS generation and cell apoptosis were predominately inhibited by Ca2+ chelating reagent BAPTA-AM. Intriguingly, ALA-treatment markedly augmented VDAC1 protein levels exclusively, and the downregulation of VDAC1 expression by specific siRNA also significantly abolished cell apoptosis. Altogether, these results suggest that VDAC1 plays a crucial role in ALA-SDT-induced THP-1 macrophages apoptosis, and targeting VDAC1 is a potential way regulating macrophages apoptosis, a finding that may be relevant to therapeutic strategies against atherosclerosis.
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Abbreviations
- ALA:
-
5 aminolevulinic acid
- BAPTA-AM:
-
1,2-bis (2-aminophenoxy) ethane-N,N,N’,N’-tetraaceti acid tetrakis (acetoxymethylester)
- DIDS:
-
4,4′-diisothiocyanostilbene-2,2′-disulfonic acid
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- IMM:
-
Inner mitochondrial membrane
- NAC:
-
N-acetyl-l-cysteine
- NAO:
-
Acridine orange 10-nonyl bromide (nonyl acridine orange)
- PpIX:
-
Protoporphyrin IX
- ROS:
-
Reactive oxygen species
- SDT:
-
Sonodynamic therapy
- THP-1:
-
A human acute monocytic leukemia cell line
- VDAC1:
-
Voltage-dependent anion channel 1
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (81101164, 81171483, 81371709) and the Scientific and Technical Key Task of Heilongjiang Province, China (GC10C306). This work was also supported by the National key clinical specialist construction Programs of China.
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The authors declare that they have no conflict of interest.
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Chen, H., Gao, W., Yang, Y. et al. Inhibition of VDAC1 prevents Ca2+-mediated oxidative stress and apoptosis induced by 5-aminolevulinic acid mediated sonodynamic therapy in THP-1 macrophages. Apoptosis 19, 1712–1726 (2014). https://doi.org/10.1007/s10495-014-1045-5
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DOI: https://doi.org/10.1007/s10495-014-1045-5