Abstract
Protection against ionizing radiation (IR) and sensitization of cancer cells to IR are apparently contrasting phenomena. However, curcumin takes on these contrasting roles leading to either protection or enhanced apoptosis in different irradiated cells. Here we studied whether pretreatment with free curcumin or a novel dendrosomal nanoformulation of curcumin (DNC) could exert protective/sensitizing effects on irradiated THP-1 leukemia cells. We employed assays including MTT viability, clonogenic survival, DNA fragmentation, PI/Annexin V flow cytometry, antioxidant system (ROS, TBARS for lipid peroxidation, 8-OHdG and γH2AX for DNA damage, glutathione, CAT and GPx activity, enzymes gene expression), ELISA (NF-κB and Nrf2 binding, TNF-α release), caspase assay, siRNA silencing of caspase-3, and western blotting to illustrate the observed protective role of curcumin in comparison with the opposite sensitizing role of its nanoformulation at a similar 10 μM concentration. The in vivo relevance of this concentration was determined via intraperitoneal administration in mice. Curcumin significantly enhanced the antioxidant defense, while DNC induced apoptosis and reduced viability as well as survival of irradiated THP-1 cells. Nrf2 binding showed an early rise and fall in DNC-treated cells, despite a gradual increase in curcumin-treated cells. We also demonstrated that DNC induced apoptosis in THP-1 cells via caspase-3 activation; whereas in combination with radiation, DNC alternatively employed a caspase-independent apoptosis pathway involving cytochrome c release from mitochondria.
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Abbreviations
- 8-OHdG:
-
8-Hydroxydeoxyguanosine
- ARE:
-
Antioxidant response element
- CAT:
-
Catalase
- Cur:
-
Curcumin
- DCFH-DA:
-
2′,7′-Dichlorodihydrofluorescein diacetate
- DNC:
-
Dendrosomal nanoformulation of curcumin
- ERK:
-
Extracellular signal-regulated kinase
- GCLM:
-
Glutamate cysteine ligase modulatory
- GPx:
-
Glutathione peroxidase
- GSH:
-
Glutathione
- IR:
-
Ionizing radiation
- HAT:
-
Histone acetylases
- HDAC:
-
Histone deacetylases
- HO-1 and HMOX-1:
-
Heme oxygenase-1
- NF-κB:
-
Nuclear factor-κB
- NQO-1:
-
NAD(P)H:quinone oxidoreductase
- Nrf2:
-
NF-E2-related factor 2
- MAPK:
-
Mitogen-activated protein kinases
- PI:
-
Propidium iodide
- PKC:
-
Protein kinase C
- ROS:
-
Reactive oxygen species
- TNF-α:
-
Tumor necrosis factor alpha
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Acknowledgments
This work was funded by grants from University of Tehran and Tarbiat-Modares University as well as a student’s research grant from Iranian Scholars Association.
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Nasser Ghaemi and Majid Sadeghizadeh contributed equally to this work
Highlights
• THP-1 cells are radioresistant but γ-ray still induces oxidative stress and damage
• Curcumin protects THP-1 cells against radiation
• DNC sensitizes THP-1 cells to radiation
• Nrf2 pathway is differentially activated by DNC
• Distinct apoptosis pathways are used by DNC and DNC+IR
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Soltani, B., Ghaemi, N., Sadeghizadeh, M. et al. Curcumin confers protection to irradiated THP-1 cells while its nanoformulation sensitizes these cells via apoptosis induction. Cell Biol Toxicol 32, 543–561 (2016). https://doi.org/10.1007/s10565-016-9354-9
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DOI: https://doi.org/10.1007/s10565-016-9354-9