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Development of a time-resolved fluoroimmunoassay for salmon insulin-like growth factor binding protein-1b

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Title: Development of a time-resolved fluoroimmunoassay for salmon insulin-like growth factor binding protein-1b
Authors: Fukuda, Miki Browse this author
Kaneko, Nobuto Browse this author
Kawaguchi, Kohei Browse this author
Hevroy, Ernst M. Browse this author
Hara, Akihiko Browse this author →KAKEN DB
Shimizu, Munetaka Browse this author →KAKEN DB
Keywords: Fasting
Insulin-like growth factor binding protein
Issue Date: Sep-2015
Publisher: Elsevier
Journal Title: Comparative biochemistry and physiology A molecular & integrative physiology
Volume: 187
Start Page: 66
End Page: 73
Publisher DOI: 10.1016/j.cbpa.2015.04.016
PMID: 25960447
Abstract: In salmon plasma/serum, three major insulin-like growth factor binding proteins (IGFBPs) are consistently detected at 22-, 28- and 41-kDa. The 22-kDa form has been identified as IGFBP-1b and shown to increase under catabolic conditions. We developed a competitive time-resolved fluoroimmunoassay (TR-FIA) for salmon IGFBP-1b. Purified salmon IGFBP-1b was used for biotin-labeling, assay standard and antiserum production. The TR-FIA did not cross-react with the 41-kDa form (IGFBP-2b) but showed 3% cross-reactivity with the 28-kDa form (IGFBP-1a). It measured IGFBP-1b levels as low as 0.4 ng/ml, and ED80 and ED20 were 0.9 and 24.6 ng/ml, respectively. There appears to be little interference by IGF-I. Using the TR-FIA, serum IGFBP-1b levels were measured in individually-tagged underyearling masu salmon fed or fasted for 5 weeks, or fasted for 3 weeks followed by refeeding for 2 weeks. Fasting for 3 weeks significantly increased circulating IGFBP-1b levels, while it returned to the basal levels after prolonged fasting for additional 2 weeks. Serum IGFBP-1b level negatively correlated with body weight, condition factor, specific growth rate and serum IGF-I level. During parr-smolt transformation of masu salmon, average circulating IGFBP-1b levels were the highest in May. There was a positive correlation between serum IGFBP-1b and IGF-I, which is in contrast to that in the fasting/feeding experiment. IGFBP-1b also showed a positive relationship with gill Na+, K+-ATPase activity. These results suggest that the relationship between circulating IGFBP-1b and IGF-I during smoltification differs from that during fasting and IGFBP-1b may play a role in the development of hypoosmoregulatory ability. (C) 2015 Elsevier Inc. All rights reserved.
Rights: © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 清水 宗敬

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