TY - JOUR
T1 - Uptake, depuration, and radiation dose estimation in zebrafish exposed to radionuclides via aqueous or dietary routes.
AU - Reinardy, Helena C.
AU - Teyssie, Jean Louis
AU - Jeffree, Ross A.
AU - Copplestone, David
AU - Henry, Theodore B.
AU - Jha, Awadhesh N.
PY - 2011/9/1
Y1 - 2011/9/1
N2 - Understanding uptake and depuration of radionuclides in organisms is necessary to relate exposure to radiation dose and ultimately to biological effects. We investigated uptake and depuration of a mixture of radionuclides to link bioaccumulation with radiation dose in zebrafish, Danio rerio. Adult zebrafish were exposed to radionuclides ((54)Mn, (60)Co, (65)Zn, (75)Se, (109)Cd, (110m)Ag, (134)Cs and (241)Am) at tracer levels (<200 Bq g(-1)) for 14 d, either via water or diet. Radioactivity concentrations were measured in whole body and excised gonads of exposed fish during uptake (14 d) and depuration phases (47 d and 42 d for aqueous and dietary exposures respectively), and dose rates were modelled from activity concentrations in whole body and exposure medium (water or diet). After 14-day aqueous exposure, radionuclides were detected in decreasing activity concentrations: (75)Se>(65)Zn>(109)Cd>(110m)Ag>(54)Mn>(60)Co>(241)Am>(134)Cs (range: 175-8 Bq g(1)). After dietary exposure the order of radionuclide activity concentration in tissues (Bq g(-1)) was: (65)Zn>(60)Co>(75)Se>(109)Cd>(110m)Ag>(241)Am>(54)Mn>(134)Cs (range: 91-1 Bq g(-1)). Aqueous exposure resulted in higher whole body activity concentrations for all radionuclides except (60)Co. Route of exposure did not appear to influence activity concentrations in gonads, except for (54)Mn, (65)Zn, and (75)Se, which had higher activity concentrations in gonads following aqueous exposure. Highest gonad activity concentrations (Bq g(-1)) were for (75)Se (211), (109)Cd (142), and (65)Zn (117), and highest dose rates (μGy h(-1)) were from (241)Am (aqueous, 1050; diet 242). This study links radionuclide bioaccumulation data obtained in laboratory experiments with radiation dose determined by application of a dosimetry modelling tool, an approach that will enable better linkages to be made between exposure, dose, and effects of radionuclides in organisms.
AB - Understanding uptake and depuration of radionuclides in organisms is necessary to relate exposure to radiation dose and ultimately to biological effects. We investigated uptake and depuration of a mixture of radionuclides to link bioaccumulation with radiation dose in zebrafish, Danio rerio. Adult zebrafish were exposed to radionuclides ((54)Mn, (60)Co, (65)Zn, (75)Se, (109)Cd, (110m)Ag, (134)Cs and (241)Am) at tracer levels (<200 Bq g(-1)) for 14 d, either via water or diet. Radioactivity concentrations were measured in whole body and excised gonads of exposed fish during uptake (14 d) and depuration phases (47 d and 42 d for aqueous and dietary exposures respectively), and dose rates were modelled from activity concentrations in whole body and exposure medium (water or diet). After 14-day aqueous exposure, radionuclides were detected in decreasing activity concentrations: (75)Se>(65)Zn>(109)Cd>(110m)Ag>(54)Mn>(60)Co>(241)Am>(134)Cs (range: 175-8 Bq g(1)). After dietary exposure the order of radionuclide activity concentration in tissues (Bq g(-1)) was: (65)Zn>(60)Co>(75)Se>(109)Cd>(110m)Ag>(241)Am>(54)Mn>(134)Cs (range: 91-1 Bq g(-1)). Aqueous exposure resulted in higher whole body activity concentrations for all radionuclides except (60)Co. Route of exposure did not appear to influence activity concentrations in gonads, except for (54)Mn, (65)Zn, and (75)Se, which had higher activity concentrations in gonads following aqueous exposure. Highest gonad activity concentrations (Bq g(-1)) were for (75)Se (211), (109)Cd (142), and (65)Zn (117), and highest dose rates (μGy h(-1)) were from (241)Am (aqueous, 1050; diet 242). This study links radionuclide bioaccumulation data obtained in laboratory experiments with radiation dose determined by application of a dosimetry modelling tool, an approach that will enable better linkages to be made between exposure, dose, and effects of radionuclides in organisms.
KW - Animals
KW - Environmental Exposure
KW - Radiation Dosage
KW - Radioisotopes
KW - Zebrafish
U2 - 10.1016/j.scitotenv.2011.06.057
DO - 10.1016/j.scitotenv.2011.06.057
M3 - Article
SN - 1879-1026
VL - 409
SP - 3771
EP - 3779
JO - Sci Total Environ
JF - Sci Total Environ
IS - 19
ER -