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pubmed-article:1953726pubmed:abstractTextFor the last two decades fish antifreeze proteins have been considered to function exclusively in conferring freeze-resistance to fish by binding to ice crystals and thereby depressing blood plasma freezing points non-colligatively. We report here the discovery of a second fundamental property of antifreeze proteins, the ability to protect cells and their membranes from hypothermic damage. Experiments were carried out exposing immature bovine oocytes to 4 degrees C for 24 h in the presence of type I alanine rich alpha helical antifreeze polypeptides (AFP) from winter flounder, type II cysteine-rich AFP from sea raven or type III AFP from ocean pout. The presence of AFP in the incubation medium resulted in an approximate four fold increase in the number of oocytes retaining an intact oolemma and a three fold increase in the number of oocytes able to undergo in vitro maturation. None of the control oocytes could be fertilized, whereas, of those incubated in AFP, the percentage which developed normally following fertilization was comparable to that observed for fresh oocytes. These results indicate that cold-sensitive mammalian cells can be rendered cold-tolerant through the addition of "antifreeze" proteins.lld:pubmed
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pubmed-article:1953726pubmed:pagination566-71lld:pubmed
pubmed-article:1953726pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:1953726pubmed:articleTitleHypothermic protection--a fundamental property of "antifreeze" proteins.lld:pubmed
pubmed-article:1953726pubmed:affiliationDepartment of Mechanical Engineering, University of California, Berkeley 94720.lld:pubmed
pubmed-article:1953726pubmed:publicationTypeJournal Articlelld:pubmed
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pubmed-article:1953726pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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