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首页> 外文期刊>Fisheries and Aquatic Sciences >Antifreeze Activity in Temperate Fish from the East Sea, Korea
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Antifreeze Activity in Temperate Fish from the East Sea, Korea

机译：韩国东海温带鱼的防冻活性

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摘要

Antifreeze proteins and glycoproteins [AF(G)Ps] constitute a group of proteins that lower the freezing but not the melting points of aqueous solutions, enabling polar and north-temperate fish to survive in ice-laden environments. However, little is known about antifreeze activity in temperate fish; such work would extend our knowledge on the functions and evolution of AF(G)Ps. In the present study, we screened for antifreeze activity in temperate fish caught off the coast of Jumunjin (37.89°N), Gangneung, Korea. Thermal hysteresis (TH) and the ability to inhibit ice recrystallization (IR) in blood, liver, and muscle samples from nine fish were examined to assess antifreeze activity. As the East Sea off the coast of Jumunjin is ice-free year round,we thought it most unlikely that the fish would express antifreeze proteins. Surprisingly, the blood of Pleurogrammus azonus and three types of tissue from Gymnocanthus herzensteini, Zoarces gilli and Kareius bicoloratus exhibited measurable TH values together with the ability to trigger characteristic morphological changes in ice crystals. Blood samples from the three species also evidenced ice recrystallization (IR) inhibition. This implies that AF(G)Ps or other antifreeze-like substances are presentin temperate fish even under nonfreezing conditions. These results contribute to our understanding of the functions and origins of antifreeze activity in fish.
机译：抗冻蛋白和糖蛋白[AF（G）Ps]构成一组蛋白质，它们降低水溶液的冻结速度但不会降低其熔点，从而使极地和北温带鱼能够在冰冷的环境中生存。然而，关于温带鱼的抗冻活性知之甚少。此类工作将扩展我们对AF（G）Ps的功能和进化的认识。在本研究中，我们筛选了韩国江陵市Jumunjin（37.89°N）沿海捕获的温带鱼的抗冻活性。检查了9条鱼的血液，肝脏和肌肉样本中的热滞（TH）和抑制冰重结晶（IR）的能力，以评估抗冻活性。由于Jumunjin沿海的东海全年无冰，我们认为这条鱼最不可能表达抗冻蛋白。出人意料的是，白灵菇的血液以及来自裸子藻，Zoarces gilli和Kareius bicoloratus的三种组织的血液显示出可测量的TH值，并具有触发冰晶特征性形态变化的能力。来自这三个物种的血样也证明了冰的重结晶（IR）抑制。这意味着即使在非冻结条件下，温带鱼中也存在AF（G）Ps或其他类似抗冻物质。这些结果有助于我们了解鱼类中抗冻活性的功能和来源。

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