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Primary and secondary bystander effect and genomic instability in cells exposed to high and low linear energy transfer radiations.

Authors :
Kanagaraj K
Rajan V
Pandey BN
Thayalan K
Venkatachalam P
Source :
International journal of radiation biology [Int J Radiat Biol] 2019 Dec; Vol. 95 (12), pp. 1648-1658. Date of Electronic Publication: 2019 Sep 17.
Publication Year :
2019

Abstract

Purpose: Non-Targeted effects (NTE), such as bystander effect (BE) and genomic instability (GI) challenge central dogma of radiation biology. Moreover, there is a need to understand its universality in different type of cells and radiation quality. Materials and method: To study BE (primary and secondary) and GI Human adult dermal fibroblast (HADF) and peripheral blood lymphocytes (PBL) were exposed to low fluence of <superscript>241</superscript> Am alpha (α) particle and 6 MV X-ray. The BE was carried out by means of co-culture methodology after exposing the cells to both types of radiation and damage was measured using micronucleus assay (MN) and chromosomal aberration assay (CA) in the p1 cells while the GI was followed up in their progeny. Results: A dose-dependent increase in DNA damages (MN and CA) was observed in directly irradiated and bystander cells. The magnitude of BE was higher (6 fold) in cells co-cultured with the α-irradiated cells than that of with X-irradiated cells. Cross exposure of both cell types confirms that radiation induced BE is cell type dependent. In addition, induced DNA damage persisted for a longer population doubling in α-particle irradiated cells. Conclusion: This work adds evidence to secondary bystander response generated from primary bystander normal cells and its dependence to radiation quality.

Details

Language :
English
ISSN :
1362-3095
Volume :
95
Issue :
12
Database :
MEDLINE
Journal :
International journal of radiation biology
Publication Type :
Academic Journal
Accession number :
31486717
Full Text :
https://doi.org/10.1080/09553002.2019.1665208