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SR-FTIR Coupled with Principal Component Analysis Shows Evidence for the Cellular Bystander Effect
E Lipiec1, K R Bambery2, J Lekki1
1a The Henryk Niewodniczanski Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland;
Radiation Research
|June 30, 2015
Summary
Proton microprobe irradiation of prostate cancer cells induced molecular changes in both targeted and bystander cells. A dose of 400 protons at 2 MeV caused the most significant macromolecular perturbation in non-irradiated neighboring cells.
Area of Science:
- Biophysics
- Cell Biology
- Medical Physics
Background:
- The cellular bystander effect describes non-targeted cells responding to radiation.
- Understanding bystander effects is crucial for radiation therapy and safety.
- Prostate cancer cells (PC-3) are a relevant model for studying radiation responses.
Purpose of the Study:
- To monitor the cellular bystander effect using synchrotron radiation-Fourier transform infrared (SR-FTIR) microscopy.
- To investigate molecular changes in directly irradiated and bystander prostate cancer cells.
- To determine the proton dose and energy most effective in inducing bystander effects.
Main Methods:
- Single prostate cancer PC-3 cells were irradiated with protons (50-2,000) at 1 or 2 MeV using a proton microprobe.
- SR-FTIR microscopy was used to analyze molecular changes in targeted and bystander cells.
- Multivariate data analysis, including Principal Component Analysis (PCA), was applied to spectral data.
Main Results:
- Spectral differences were observed in both targeted and bystander cells.
- Changes included alterations in DNA backbone, nucleic bases, and protein secondary structure.
- A dose of 400 protons at 2 MeV was identified as most effective in perturbing bystander cell macromolecules.
Conclusions:
- SR-FTIR microscopy is a viable method for studying the cellular bystander effect.
- Proton irradiation induces significant molecular changes in bystander cells.
- Specific proton doses and energies can be optimized to elicit bystander responses in prostate cancer cells.
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