Differential biological effect of low doses of ionizing radiation depending on the radiosensitivity in a cell line model
Por:
Palma-Rojo, E, Barquinero, JF, Pérez-Alija, J, González, JR, Armengol, G
Publicada:
1 nov 2024
Ahead of Print:
1 sep 2024
Resumen:
PurposeExposure to low doses (LD) of ionizing radiation (IR), such as the ones employed in computed tomography (CT) examination, can be associated with cancer risk. However, cancer development could depend on individual radiosensitivity. In the present study, we evaluated the differences in the response to a CT-scan radiation dose of 20 mGy in two lymphoblastoid cell lines with different radiosensitivity.Materials and MethodsSeveral parameters were studied: gene expression, DNA damage, and its repair, as well as cell viability, proliferation, and death. Results were compared with those after a medium dose of 500 mGy.ResultsAfter 20 mGy of IR, the radiosensitive (RS) cell line showed an increase in DNA damage, and higher cell proliferation and apoptosis, whereas the radioresistant (RR) cell line was insensitive to this LD. Interestingly, the RR cell line showed a higher expression of an antioxidant gene, which could be used by the cells as a protective mechanism. After a dose of 500 mGy, both cell lines were affected by IR but with significant differences. The RS cells presented an increase in DNA damage and apoptosis, but a decrease in cell proliferation and cell viability, as well as less antioxidant response.ConclusionsA differential biological effect was observed between two cell lines with different radiosensitivity, and these differences are especially interesting after a CT scan dose. If this is confirmed by further studies, one could think that individuals with radiosensitivity-related genetic variants may be more vulnerable to long-term effects of IR, potentially increasing cancer risk after LD exposure.
Filiaciones:
Palma-Rojo, E:
Univ Autonoma Barcelona, Dept Biol Anim Biol Vegetal & Ecol, Unitat Antropol Biol, E-08193 Bellaterra, Catalonia, Spain
Barquinero, JF:
Univ Autonoma Barcelona, Dept Biol Anim Biol Vegetal & Ecol, Unitat Antropol Biol, E-08193 Bellaterra, Catalonia, Spain
Pérez-Alija, J:
Hosp Santa Creu & Sant Pau, Serv Radiofis & Radioproteccio, Barcelona, Catalonia, Spain
González, JR:
Barcelona Inst Global Hlth ISGlobal, Barcelona, Spain
Armengol, G:
Univ Autonoma Barcelona, Dept Biol Anim Biol Vegetal & Ecol, Unitat Antropol Biol, E-08193 Bellaterra, Catalonia, Spain
Green Submitted, hybrid
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