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Synthesis and recycling of antifreeze glycoproteins in polar fishes

Published online by Cambridge University Press:  02 April 2012

Clive W. Evans*
Affiliation:
School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Linn Hellman
Affiliation:
School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Martin Middleditch
Affiliation:
School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Joanna M. Wojnar
Affiliation:
School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Margaret A. Brimble
Affiliation:
School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Arthur L. Devries
Affiliation:
Department of Animal Biology, University of Illinois at Urbana-Champaign, 524 Burrill Hall, 407 South Goodwin, Urbana, IL 61801, USA

Abstract

Evolutionary disparate Antarctic notothenioids and Arctic gadids have adapted to their freezing environments through the elaboration of essentially identical antifreeze glycoproteins (AFGPs). Here we show that this convergence of molecular identity, which evolved from unrelated parent genes, extends to convergence in physiological deployment. Both fish groups synthesize AFGPs in the exocrine pancreas from where they are discharged into the gut to inhibit the growth of ingested ice. Antifreeze glycoproteins not lost with the faeces are resorbed from the gut via the rectal epithelium, transported to the blood and ultimately secreted into the bile, from where they re-enter the gastrointestinal tract. Antifreeze glycoprotein recirculation conserves energy expenditure and explains how high levels of AFGPs reach the blood in notothenioids since, unlike Arctic gadids which also synthesize AFGP in the liver, AFGP secretion in notothenioids is directed exclusively towards the gastrointestinal lumen. Since AFGPs function by inhibiting ice crystal growth, ice must be present for them to function. The two fish groups are thus faced with an identical problem of how to deal with internal ice. Here we show that both accumulate AFGPs within ellipsoidal macrophages of the spleen, presumably adsorbed to phagocytosed ice crystals which are then held until a warming event ensues.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2012

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