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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Coral physiological adaptations to air exposure: Heat shock and oxidative stress responses in Veretillum cynomorium
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Coral physiological adaptations to air exposure: Heat shock and oxidative stress responses in Veretillum cynomorium

机译：珊瑚对空气暴露的生理适应：食蟹猴的热休克和氧化应激反应

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摘要

Intertidal environments are boundaries between marine and terrestrial systems and are subject to rapid fluctuations in physical characteristics across tidal cycles. Although extreme low-tide, air exposure (hypoxia), high-irradiance and thermal stress are structuring forces of intertidal coral communities, some octocorals have developed the ability to withstand emersion. Here, we investigated, for the first time, the physiological mechanisms that enable an octocoral, Veretillum cynomorium, to tolerate the rapid cyclical fluctuations of the intertidal environment. A significant increase in expression of two molecular chaperones, heat shock cognate 70 (HSC70) and heat shock protein 70 (HSP70), was observed throughout the emersion period, which was then followed by a drop during immersion. An opposite trend was observed for the peroxidase activity, as there was no malondialdehyde (MDA) build-up in coral tissues during air exposure. Thus, coral tissues were not subjected to any peroxidative damage during air exposure. Additionally, during the emersion phase, there was a significant increase in CAT and GST activities, whereas SOD activity remained stable. Altogether, our results suggest that HSC70/HSP70, CAT and GST constitute an integrated response during oxygen-restricted periods. In fact, this strategy may constitute an anticipatory protective response to the oxidative stress caused by the reoxygenation event. The present study constitutes the first evidence of cellular preparation to post-hypoxic free radical damage in octocorals, and we argue that such physiological strategy can allow these organisms to thrive in intertidal habitats and withstand air exposure during low tides.
机译：潮间环境是海洋和陆地系统之间的边界，在整个潮汐周期中，其物理特征会快速波动。尽管极低的潮汐，空气暴露（缺氧），高辐照度和热应力是潮间带珊瑚群落的构造力，但一些八爪鱼已发展出抵御潮气的能力。在这里，我们首次研究了使八齿的Veretillum cynomorium能够忍受潮间环境快速周期性波动的生理机制。在整个萌发期间，观察到两种分子伴侣蛋白，即热激同源蛋白70（HSC70）和热激蛋白70（HSP70）的表达显着增加，然后在浸入过程中下降。在过氧化物酶活性方面观察到相反的趋势，因为在空气暴露期间珊瑚组织中没有丙二醛（MDA）积累。因此，在暴露于空气中时，珊瑚组织不会受到任何过氧化损伤。此外，在萌芽阶段，CAT和GST活性显着增加，而SOD活性保持稳定。总之，我们的结果表明，HSC70 / HSP70，CAT和GST构成了氧气限制期间的综合反应。实际上，该策略可以构成对由再氧化事件引起的氧化应激的预期保护性反应。本研究构成了八角鲨低氧后自由基损伤的细胞制备的第一个证据，我们认为这种生理策略可以使这些生物体在潮间带栖息地繁衍生息，并在潮汐时抵抗空气。

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    Tatiana Teixeira; Mario Diniz; Ricardo Calado; Rui Rosa;

  • 作者单位

    Laboratorio Maritimo da Guia, Centra de Oceanografia, Faculdade de Ciencias da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939,2750-374 Cascais, Portugal;

    REQUIMTE, Departamento de Quimica, Centra de Quimica Fina e Biotecnologia, Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Quinta da Torre 2829-516,Caparica, Portugal;

    Departmento de Biologia & CFSAM, Universidade de Aveiro, Campus Universitario de Santiago, Aveiro 3810-193, Portugal;

    Laboratorio Maritimo da Guia, Centra de Oceanografia, Faculdade de Ciencias da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939,2750-374 Cascais, Portugal;

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  • 正文语种 eng
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  • 关键词

    antioxidant enzymes; heat shock proteins; intertidal zone; octocorals;

    机译：抗氧化酶;热激蛋白;潮间带八音;

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