Hypoxia-inducible haemoglobins of Daphnia pulex and their role in the response to acute and chronic temperature increase.
Hypoxia-inducible haemoglobins of Daphnia pulex and their role in the response to acute and chronic temperature increase.
复制标题
水蚤缺氧诱导的血红蛋白及其在急慢性温度升高反应中的作用
DOI:
10.1016/j.bbapap.2013.01.036
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Paul RJ
中科院分区:
文献类型:
--
作者:
Zeis B;Becker D;Gerke P;Koch M;Paul RJ
Daphnia pulexis challenged by severe oxygen and temperature changes in its habitat. In response to hypoxia, the equipment of oxygen transport proteins is adjusted in quantity and quality by differential expression of haemoglobin isoforms. This study focuses on the response of 20 °C acclimated animals to elevated temperature using transcriptomic and proteomic approaches. Acute temperature stress (30 °C) induced the hypoxia-inducible Hb isoforms most strongly, resulting in an increase of the haemoglobin mRNA pool by 70% within 8 h. Long-term-acclimation to moderately elevated temperature (24 °C) only evoked minor changes of the Hb mRNA suite. Nevertheless, the concentration of the hemolymph pool of haemoglobin was elevated by 80%. In this case, the constitutive Hb isoforms showed the strongest increase, with Hb01 and Hb02 contributing by 64% to the total amount of respiratory protein. The regulation patterns upon acute temperature stress likely reflect temperature-induced tissue hypoxia, whereas in case of persisting exposure to moderately elevated temperature, acclimation processes enabled the successful return to oxygen homeostasis. This article is part of a Special Issue entitled: Oxygen Binding and Sensing Proteins.
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