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Hepatic insulin-like growth-factor binding protein (igfbp) responses to food restriction in Atlantic salmon smolts.

Abstract：

:The growth hormone (Gh)/insulin-like growth-factor (Igf) system plays a central role in the regulation of growth in fishes. However, the roles of Igf binding proteins (Igfbps) in coordinating responses to food availability are unresolved, especially in anadromous fishes preparing for seaward migration. We assayed plasma Gh, Igf1, thyroid hormones and cortisol along with igfbp mRNA levels in fasted and fed Atlantic salmon (Salmo salar). Fish were fasted for 3 or 10days near the peak of smoltification (late April to early May). Fasting reduced plasma glucose by 3days and condition factor by 10days. Plasma Gh, cortisol, and thyroxine (T4) were not altered in response to fasting, whereas Igf1 and 3,5,3'-triiodo-l-thyronine (T3) were slightly higher and lower than controls, respectively. Hepatic igfbp1b1, -1b2, -2a, -2b1 and -2b2 mRNA levels were not responsive to fasting, but there were marked increases in igfbp1a1 following 3 and 10days of fasting. Fasting did not alter hepatic igf1 or igf2; however, muscle igf1 was diminished by 10days of fasting. There were no signs that fasting compromised branchial ionoregulatory functions, as indicated by unchanged Na(+)/K(+)-ATPase activity and ion pump/transporter mRNA levels. We conclude that dynamic hepatic igfbp1a1 and muscle igf1 expression participate in the modulation of Gh/Igf signaling in smolts undergoing catabolism.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Breves JP,Phipps-Costin SK,Fujimoto CK,Einarsdottir IE,Regish AM,Björnsson BT,McCormick SD

doi

10.1016/j.ygcen.2016.05.015

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

79-87

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(16)30136-8

journal_volume

233

pub_type

杂志文章

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