Dr. Anna Magdalena Crous Profile

Dr. Anna Magdalena Crous

Post Doctoral Research Fellow

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Proceedings Article | 8 March 2016 Paper

Biochemical responses of isolated lung CSCs after application of low intensity laser irradiation

Heidi Abrahamse, Anine Crous

Proceedings Volume 9695, 96950J (2016) https://doi.org/10.1117/12.2228902

KEYWORDS: Laser irradiation, Stem cells, Flow cytometry, Luminescence, Acquisition tracking and pointing, Lung, Cell death, Lung cancer, Cancer, Visible radiation

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Studies have shown that using high fluences of Low Intensity Laser Irradiation (HF-LILI) produce apoptotic effects on normal and neoplastic cells. This study aimed to determine whether HF-LILI induce cell death in lung CSCs. Lung CSCs were isolated using the stem cell marker CD 133, characterized using flow cytometry, and applied in experiments which included treatment with LILI at wavelengths of 636, 825 and 1060 nm with fluences ranging from 5 J/cm² to 40 J/cm². Viability and proliferation studies, using Alamar blue assay and adenosine triphosphate luminescence (ATP), indicated an increase when treating lung CSCs with low fluences of 5 - 20 J/cm² and a decrease in viability and proliferation as well as an increase in apoptosis when applying a fluence of 40 J/cm² indicated by flow cytometry using Annexin V and propidium iodide (PI) dyes. Results indicate that LILI, when treating lung CSCs, can induce either a bio-stimulatory or bio-inhibitory effect depending on the wavelength and fluence used. This study indicated successful apoptotic induction of lung CSCs. Future experiments should be able to conclude the exact mechanism behind HF-LILI, which can be used in the targeted treatments of CSC elimination, implementing HF-LILI in the same manner as PDT in the absence of a photosensitizer.

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