Characterizing responses to gamma radiation by a highly clonogenic fish brain endothelial cell line

Journal Article · Sat Jul 15 04:00:00 EDT 2017 · Environmental Research

DOI:https://doi.org/10.1016/J.ENVRES.2017.03.039· OSTI ID:22708007

Sokeechand, Bibi S.H. ^[1]; Seymour, Colin B.; Mothersill, Carmel E. ^[2]

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1. Radiation Sciences Program, School of Graduate and Postdoctoral Studies, McMaster University, Hamilton, ON (Canada)
2. Department of Biology, McMaster University, Hamilton, ON (Canada)

Purpose: The clonogenic property and radiobiological responses of a fish brain endothelial cell line, eelB, derived from the American eel were studied. Methods: Clonogenic assays were performed to determine the plating efficiency of the eelB cells and to evaluate the clonogenic survival fractions after direct irradiation to low-dose low-LET gamma radiation or receiving irradiated cell conditioned medium in the bystander effect experiments. Result: eelB had the second highest plating efficiency ever reported to date for fish cell lines. Large eelB macroscopic colonies could be formed in a short period of time and were easy to identify and count. Unlike with other fish clonogenic cell lines, which had a relatively slow proliferation profile, clonogenic assays with the eelB cells could be completed as early as 12 days in culture. After direct irradiation with gamma rays at low doses ranging from 0.1 Gy to 5 Gy, the dose-clonogenic survival curve of the eelB cell line showed a linear trend and did not develop a shoulder region. A classical radio-adaptive response was not induced with the clonogenic survival endpoint when the priming dose (0.1 or 0.5 Gy) was delivered 6 h before the challenge dose (3 or 5 Gy). However, a radio-adaptive response was observed in progeny cells that survived 5 Gy and developed lethal mutations. eelB appeared to lack the ability to produce damaging radiation-induced bystander signals on both eelB and HaCaT recipient cells. Conclusion: eelB cell line could be a very useful cell model in the study of radiation impacts on the aquatic health. - Highlights: • The fish endothelial cell line eelB showed exceptional clonogenic properties. • eelB decreased clonogenic survival upon an increase in gamma dose (0.1-5 Gy). • eelB did not develop a classical radio-adaptive response (RAR). • eelB progenies surviving 5 Gy developed lethal mutations and a RAR-like response. • eelB appeared to lack the ability to produce radiation-induced bystander effects.

• OSTI ID: 22708007
• Journal Information: Environmental Research, Journal Name: Environmental Research Vol. 156; ISSN ENVRAL; ISSN 0013-9351
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BRAIN
DOSES
ENERGY EFFICIENCY
FRACTIONATED IRRADIATION
GAMMA RADIATION