Material properties that control the cytotoxicity of ZnO nanoparticles
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1 Material properties that control the cytotoxicity of ZnO nanoparticles Alex Punnoose, Jordan Chess, Catherine Anders, John Rassmussen, Denise Wingett, Kelsey Dodge and Katie Rainey, Boise State University, ID. and Jeffery Greenwood and Robert Tanguay Oregon State University, OR Supported by NSF grants CBET nano EHS and EAGER DMR
2 Preferential cytotoxicity of ZnO NP to cancer cells 100% NP toxicity to cancer cells % viable cells 80% 60% 40% 20% Jurkat Hut-78 normal T cells 0% [NP] in mm Reported preferential killing of Jurkat and Hut-78 cancer cells by 8nm ZnO NP without any measurable effect on normal T and B cells: 1. A. Punnoose, K. M. Reddy and D. Wingett, US Patent No: 8,187,638, Preferential killing of cancer cells and activated human T cells using ZnO nanoparticles. 2. Reddy, et al., Selective toxicity of zinc oxide nanoparticles to prokaryotic and eukaryotic systems. Applied Physics Letters, 2007, 90, p Hanley, et al, Preferential killing of cancer cells and activated human T cells using zinc oxide nanoparticles. Nanotechnology, : p Hanley, C., et al., Nanoscale Research Letters, 2009, 4: p Thurber, et al, Nanotoxicology 2012, 6: p
3 ZnO NP toxicity: Conflicting reports Preferential cytotoxicity of ZnO NP to cancer cells was observed by other groups: 1. Ostrovsky, S., et al., Selective cytotoxic effect of ZnO nanoparticles on glioma cells. Nano Research, : p Sasidharan, A., et al., Rapid dissolution of ZnO nanocrystals in acidic cancer microenvironment leading to preferential apoptosis. Nanoscale, : p M. Premanathan, et al., Selective toxicity of ZnO nanoparticles toward Gram-positive bacteria and cancer cells by apoptosis through lipid peroxidation. Nanomedicine: NBM, : p L. Taccola, et al, Zinc oxide nanoparticles as selective killers of proliferating cells. International Journal of Nanomedicine, : p Strong toxic response of ZnO NP to normal healthy cells, snails and embryonic zebrafish: 1. George, S., et al., Use of a Rapid Cytotoxicity Screening Approach To Engineer a Safer Zinc Oxide Nanoparticle through Iron Doping. ACS Nano, : p Brunner, T.J., et al., In vitro cytotoxicity of oxide nanoparticles: comparison to asbestos, silica, and the effect of particle solubility. Environmental science technology, : p Croteau, M.N., et al., A novel approach reveals that zinc oxide nanoparticles are bioavailable and toxic after dietary exposures. Nanotoxicology, : p Bai, W., et al., Toxicity of zinc oxide nanoparticles to zebrafish embryo: a physicochemical study of toxicity mechanism Journal of Nanoparticle Research, : p Sun, J., et al., Cytotoxicity, permeability, and inflammation of metal oxide nanoparticles in human cardiac microvascular endothelial cells, Cell Biol Toxicol., : p. 333.
4 What makes identical NP? ZnO-I: Forced hydrolysis of Zn acetate dehydrate using diethylene glycol (DEG) as the solvent. ZnO-II: Forced hydrolysis of Zn acetate dehydrate using denatured ethanol, using LiOH to maintain correct ph; aged in n-heptane. X-ray diffraction shows single phase wurtzite ZnO with average crystallite size of 8 ± 2 nm for both ZnO-I and ZnO-II. Lattice parameters were around a=3.25± Å and c=5.21± Å. Journal of Applied Physics 113, 17C302 (2013). Physical Review B 82, (2010).
5 Morphology - ZP TEM confirmed crystallite size ~8nm. Energy Dispersive Spectroscopy and X-ray Photoelectron Spectroscopy confirmed elemental composition. Zeta potential: ZnO-I: 40mV ZnO-II: 12mV
6 Zeta Potential ZnO I show larger ZP in the +30 to 50m V ZnO II NP show much lower ZP < +20 mv Zeta Potential (mv) ZnO 1 4 nm ZnO 1 8 nm ZnO 2 5 nm ZnO 2 7 nm ph
7 FTIR Spectroscopy: Surface structure Both show surface adsorbed groups related to acetate and significant hydroxyl bands. ZnO-I has surface adsorbed DEG layer
8 Optical/PL properties of ZnO NP The PL spectra recorded at 10K using a 325 nm He:Cd laser. Both samples show the UV emission band at ~3.37 ev due to near bandedge transition of wide band gap ZnO NPs (free exciton recombination). Normalized PL Intensity (a.u.) ZnO-I As-prepared ZnO-II NP show large green emission near 500nm. Large number of defects (oxygen vacancies/ interstitials)? Normalized PL Intensity (a.u.) ZnO-II As-prepared Wavelength (nm)
9 size (nm) a (Å) c (Å) ZnO NP Modified physico-chemical properties by varying hydrolysis ratio, reaction temperature, centrifuge speed, number of washing cycles, etc vol (ų) NC NC NC NC NC NC NT NT QC QC QC
10 Toxicity of modified ZnO NP to CD4 T cells and Hut 78 cancer cells Trend lines depicting toxicity levels of nanoparticles. Blue=Hut 78 and Red=CD4 T cells. Y- axis is viability detected by PI via FACS and x-axis is mm concentration of nanoparticle.
11 Role of surface charge/zp of ZnO NP
12 Role of hydrodynamic size of ZnO NP
13 Role of catalytic activity of ZnO NP Rhodamine B as a model dye to evaluate the catalytic activity using absorbance peak at 553nm. The photocatalytic rate constant k, kt = ln(c 0 /C) (where t = time, C 0 = initial concentration of RhB molecules, and C = concentration after UV irradiation). UV reactor with 2537 Å UV lamps delivering 3.2mW/cm 2 No UV lamp for Dark experiments Journal of Applied Physics 113, 17B504 (2013).
14 Catalytic activity of ZnO NP: UV vs Dark Rate constant in dark k in dark k in light Rate constant in light/uv NC021 NC040 NC042 NC043 NC044 NC045 NT114 Samples QC019 QC016 QC017
15 Catalytic activity of ZnO NP in Dark (no UV) 0.25 ZnO NP in Dark, no UV Arb. units RhB Bulk ZnO NC021 QC016 NC044 NC Wavelength (nm)
16 Catalytic activity of ZnO NP in dark Role of catalytic activity of ZnO NP on Hut-78 Cancer cells IC Using PI and FACS Using Alamar Blue Catalytic rate constant k (in dark)
17 Conclusions ZnO NP display selective toxicity to cancer cells. Toxicity depends on the physico-chemical properties such as surface charge, hydrodynamic size and catalytic activity. Synthesis methods, precursors and media, and reaction conditions and parameters significantly influence the physicochemical properties and cytotoxicity. Surface structure and defects plays the most important role in cytotoxicity FTIR, ZP, PL are important to compare samples. Ability to tailor the critical materials/surface properties will allow the development of design rules for eliminating unwanted toxicity as well as to tailor cell specific toxicity for nanomedicinal applications.
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20 Samples Size k-dark k-uv selectivity % CD4 IC50 FITC Hut-78 ic50 facs Hut-78 IC50 AB ZP (mv) Hydrodynamic size (nm) NC E NC E NC E NC E NC E NC E NT E QC E QC E QC E
21 Catalytic activity of ZnO NP in dark lnc/c RhB NT010 QC017 NT114 NC042 Bulk NT034 NC021 NC045 NC044 QC019 QC016 Water Time (min)
22 Zeta Potential ZnO I show larger ZP in the +30 to 50m V ZnO II NP show much lower ZP < +20 mv Zeta Potential (mv) ZnO 1 4 nm ZnO 1 8 nm ZnO 2 5 nm ZnO 2 7 nm ph
23 0.60 Hut 78 cancer cells and ZnO NP 0.55 IC 50 (mm of ZnO NP) Using PI and FACS Using Alamar Blue Rate constant k (using RhB)
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