Abstract
Since polyacrylic acid capped platinum nano-particles (nano-Pts) are known to have a unique ability to quench superoxide (O2 −) and hydrogen peroxide (H2O2), the anti-oxidant activity of nano-Pts against apoptosis induced by x-irradiation in human lymphoma U937 cells was investigated. DNA fragmentation assay, Annexin V-FITC/PI by flow cytometry and Giemsa staining revealed a significant decrease in apoptosis induced by 10 Gy, when cells were pre-treated with nano-Pts in a dose-dependent manner. Pre-treatment with nano-Pts significantly decreased radiation-induced reactive oxygen species (ROS) production, Fas expression and loss of mitochondrial membrane potential as determined by flow-cytometry. Furthermore, western blot analysis also showed that the expression of cleaved caspase-3, Bid and cytosolic cytochrome-c were significantly reduced in nano-Pts pretreated cells. Due to the catalase mimetic activity of nano-Pts, these results indicate that pre-treatment of U937 cells with nano-Pts significantly protect radiation-induced apoptosis by inhibiting intracellular ROS (mainly H2O2), which plays a key role in the induction of apoptosis, because of no practical observation of intracellular O2 − formation.
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Abbreviations
- Nano-Pts:
-
Platinum nano particles
- ROS:
-
Reactive oxygen species
- H2O2 :
-
Hydrogen peroxide
- O −2 :
-
Superoxide
- OH:
-
Hydroxyl radical
- OCl− :
-
Hypochlorite
- NO:
-
Nitric oxide
- ONOO:
-
Peroxynitrite
- SOD:
-
Superoxide dismutase
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Jawaid, P., Rehman, M.u., Yoshihisa, Y. et al. Effects of SOD/catalase mimetic platinum nanoparticles on radiation-induced apoptosis in human lymphoma U937 cells. Apoptosis 19, 1006–1016 (2014). https://doi.org/10.1007/s10495-014-0972-5
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DOI: https://doi.org/10.1007/s10495-014-0972-5