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Type: Journal article
Title: Development and validation of a radioimmunoassay for fish insulin-like growth factor I (IGF-I) and the effect of aquaculture related stressors on circulating IGF-I levels
Author: Dyer, Anthony R.
Upton, Zee
Stone, David Alan Joseph
Thomas, Philip Mark
Soole, Kathleen Lydia
Higgs, Naomi
Quinn, K. J.
Carragher, John F.
Citation: General and Comparative Endocrinology, 2004; 135(3):268-275
Publisher: Elsevier
Issue Date: 2004
ISSN: 0016-6480
School/Discipline: School of Earth and Environmental Sciences : Ecology and Evolutionary Biology
Statement of
Anthony R Dyer, Zee Upton, David Stone, Philip M Thomas, Kathleen L Soole, Naomi Higgs, Kirsty Quinn and John F Carragher
Abstract: This paper describes the development and validation of a commercially available radioimmunoassay (RIA) for the detection of fish insulin-like growth factor-I (IGF-I). The assay was developed using recombinant barramundi IGF-I as antigen and recombinant tuna IGF-I as radiolabelled tracer and standard. Assay sensitivity was 0.15 ng/ml, inter-assay variation was 16% (n=9) and intra-assay variation was 3% (n=10). Cross reactivity of less than 0.01% was found with salmon insulin, salmon IGF-II and barramundi IGF-II, less than 0.5% with human IGF-I and less than 1% with human IGF-II. Parallel dose-response inhibition curves were shown for barramundi (Lates calcarifer), coho salmon (Oncorhynchus kisutch), Southern Bluefin tuna (Thunnus maccoyii), tilapia (Oreochromis mossambicus), and seabream (Pagrus auratus) IGF-I. The assay was then used to measure stress related changes in different aquacultured fish species. Salt water acclimated Atlantic salmon smolts (Salmo salar) bathed for 2 h in fresh water showed significantly lower IGF-I concentrations than control smolts two days after the bath (53.1 compared to 32.1 ng/ml), with levels of IGF-I also lower in smolts exhibiting stunted growth (stunts). Capture and confinement of wild tuna in sea-cages resulted in a significant decrease in IGF-I levels (28 ng/ml) when compared to tuna captured and sampled immediately (48 ng/ml), but had recovered to starting levels after 3 weeks (43 ng/ml). Handling and isolation in silver perch (Bidyanus bidyanus) led to a gradual decline in IGF-I over a 12 h period (36–19 ng/ml) but showed signs of recovery by 24 h (24 ng/ml) and had recovered fully 72 h after treatment (40 ng/ml). A similar trial in black bream (Acanthopagrus butcherii) showed comparable results with IGF-I levels gradually decreasing (40–26 ng/ml) over 24 h, results that were mirrored by cortisol concentrations which increased during this time (1–26 ng/ml). In the studies presented here changes in IGF-I levels were not observed for at least 3 h after exposure to the stressor. We suggest this is due to the endocrine nature of IGF-I regulation and the clearance rate of IGF-I in vivo.
RMID: 0020091958
DOI: 10.1016/j.ygcen.2003.10.002
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Appears in Collections:Ecology, Evolution and Landscape Science publications

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