Keywords

Breast cancer, Cerium oxide nanoparticles, Ionizing radiation, Nanoceria, Nanoparticles, Radiation induced cell death

Abstract

The ability of engineered cerium oxide nanoparticles to confer radioprotection was examined. Rat astrocytes were treated with cerium oxide nanoparticles to a final concentration of 10 nanomolar, irradiated with a single 10 Gy dose of ionizing radiation and cell death was evaluated by propidium iodine uptake at 24 and 48 hours after radiation insult. Treatment of rat astrocytes with nanoceria resulted in an approximate 3-fold decrease in radiation induced death. These results suggest that the nanoceria are conferring protection from radiation induced cell death. Further experiments with human cells were conducted. Human normal and tumor cells (MCF-7 and CRL8798) were treated with the same dosage of cerium oxide nanoparticles, irradiated and evaluated for cell survival. Treatment of normal cells (MCF-7) conferred nearly 99% protection from radiation-induced cell death while the same concentration of nanoceria showed almost no protection in tumor cells (CRL8798). TUNEL analysis results of similarly treated cells demonstrated that nanoceria reduced radiation-induced cell death by 3-fold in normal breast cells but not in MCF-7 tumor cell lines when cultured under the same conditions. We concluded that cerium oxide nanoparticles confer radioprotection in a normal human breast line (CRL 8798) but not in a human breast tumor line (MCF-7). It is hoped that the outcome of this study will guide future endeavors toward a better elucidation of the molecular pathways involved in the protection of cells with nanoceria against radiation-induced cell death, as well as the minimization of the bystander effect in radiation therapy.

Notes

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Graduation Date

2006

Semester

Spring

Advisor

Kollattukudy, Pappachan

Degree

Master of Science (M.S.)

College

Burnett College of Biomedical Sciences

Department

Molecular Biology and Microbiology

Degree Program

Molecular and Microbiology

Format

application/pdf

Identifier

CFE0001048

URL

http://purl.fcla.edu/fcla/etd/CFE0001048

Language

English

Release Date

April 2013

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Subjects

Biomedical Sciences -- Dissertations, Academic, Dissertations, Academic -- Biomedical Sciences

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