PUBLICATION
Cadmium bound to metal rich granules and exoskeleton from Gammarus pulex causes increased gut lipid peroxidation in zebrafish following single dietary exposure
- Authors
- Khan, F.R., Bury, N.R., and Hogstrand, C.
- ID
- ZDB-PUB-091120-14
- Date
- 2010
- Source
- Aquatic toxicology (Amsterdam, Netherlands) 96(2): 124-129 (Journal)
- Registered Authors
- Bury, Nicolas
- Keywords
- Malondialdehyde (MDA), Trophic transfer, Bioavailability, Sub-cellular distribution, Metallothionein, Metal rich granules
- MeSH Terms
-
- Amphipoda/metabolism*
- Animals
- Cadmium/metabolism
- Cadmium/toxicity*
- Diet
- Environmental Exposure
- Intestines/drug effects*
- Lipid Peroxidation/drug effects*
- Malondialdehyde/metabolism
- Time Factors
- Water Pollutants, Chemical/toxicity*
- Zebrafish/physiology*
- PubMed
- 19883947 Full text @ Aquat. Toxicol.
Citation
Khan, F.R., Bury, N.R., and Hogstrand, C. (2010) Cadmium bound to metal rich granules and exoskeleton from Gammarus pulex causes increased gut lipid peroxidation in zebrafish following single dietary exposure. Aquatic toxicology (Amsterdam, Netherlands). 96(2):124-129.
Abstract
There has been a growing interest in establishing how the sub-cellular distribution of metals in macro-invertebrate prey affects metal trophic bioavailability and toxicity. In this study, the crustacean Gammarus pulex was exposed to 300mugCdl(-1) spiked with (109)Cd for 13 days, from which the two principal metal containing sub-cellular fractions, the metallothionein-like protein (MTLP) and the metal rich granule and exoskeleton (MRG+exo) were isolated. These fractions were produced at equal metal content, incorporated into gelatin and fed to zebrafish as a single meal; assimilation efficiency (AE), carcass and gut tissue metal concentrations and gut lipid peroxidative damage measured as malondialdehyde (MDA) were assessed. The AE of cadmium bound to the MTLP fraction was 32.1+/-5.6% which was significantly greater than the AE of MRG+exo bound Cd, 13.0+/-2.1% (p<0.05). Of the metal retained by the fish at 72h post-feeding, 94% of MTLP-Cd had been incorporated into the carcass, whereas a significant proportion (46%) of MRG+exo-Cd, although assimilated, appeared to remain associated with intestinal tissue. However, this did not translate into a gut tissue concentration difference with 6.8+/-1.2ngCdg(-1) in fish fed MTLP-Cd compared to 9.5+/-1.4ngCdg(-1) in fish fed MRG+exo fraction. Both feeds led to significantly increased MDA levels compared to the control group (gelatin only feed), but MRG+exo feed caused significantly more oxidative damage than the MTLP feed (p<0.01). Thus, MTLP-Cd is more bioavailable than the cadmium bound to granules and exoskeleton, but it was the latter fraction, largely considered as having limited bioavailability, that appeared to exert a greater localised oxidative injury to the digestive tract of zebrafish.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping