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首页> 外文期刊>Marine biology >The effect of cadmium on antioxidant responses and the susceptibility to oxidative stress in the hydrothermal vent mussel Bathymodiolus azoricus
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The effect of cadmium on antioxidant responses and the susceptibility to oxidative stress in the hydrothermal vent mussel Bathymodiolus azoricus

机译：镉对热液喷口贻贝嗜盐菌抗氧化反应和氧化应激敏感性的影响

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Hydrothermal vents are a unique environment of extreme physical-chemical characteristics and biological species composition. Cd is a toxic non-essential metal present in high concentrations in the hydrothermal vent environment, contrary to those found in marine coastal areas. Cd toxicity has been related, among other things, with reactive oxygen species production, even though this is a non-redox metal. Bathymodiolus azoricus is a deep-sea Mytilid bivalve very common in the Mid Atlantic Ridge (MAR) hydrothermal vent fields and very little is known about the antioxidant defence system in this specie. Because lethal Cd concentration in B. azoricus is unknown, the aim of this study was to assess the effects of a Cd concentration higher than that found in the hydrothermal vents on oxidative stress biomarkers, such as antioxidant enzymes. Mussels were exposed to 100 μg l~(-1) Cd during 24, 48 and 144 h, respectively, in a pressurized aquarium (IPOCAMP). Superoxide dismutase (SOD), catalase (CAT), glutathi-one peroxidases (GPx), total oxyradical scavenging capacity (TOSC), metallothionein (MT) and lipid per-oxidation (LPO) were measured in the gills and mantle of B. azoricus. The results indicate that gills are first affected by Cd toxicity. This may be due to different physiological functions of the tissues and by the presence of thio and methanotrophic symbiotic bacteria in the gills. The SOD and CAT are inhibited during the first day of exposure in the gills, although TOSC and MT concentrations were the same in control and exposed mussels. In the mantle, enzymatic activation only occurred after 6 days, and no significant differences in MT concentrations were found in the control and exposed mussels during the first day, as observed in the gills.
机译：热液喷口是具有极端物理化学特征和生物物种组成的独特环境。 Cd是在热液喷口环境中高浓度存在的有毒非必需金属，与在海洋沿海地区发现的金属相反。镉的毒性尤其与活性氧的产生有关，即使这是一种非氧化还原金属。象鼻臭线虫是深海Mytilid双壳类动物，在中大西洋海脊（MAR）热液喷口田中非常常见，对该物种的抗氧化防御系统知之甚少。由于偶氮芽孢杆菌中致死的Cd浓度未知，因此本研究的目的是评估高于热液喷口中Cd浓度的Cd对氧化应激生物标记物（例如抗氧化剂）的影响。在加压水族馆（IPOCAMP）中，贻贝分别在24、48和144 h内暴露于100μgl（-1）Cd。在偶氮芽孢杆菌的ill和地幔中测量了超氧化物歧化酶（SOD），过氧化氢酶（CAT），谷胱甘肽过氧化物酶（GPx），总氧自由基清除能力（TOSC），金属硫蛋白（MT）和脂质过氧化（LPO）。 。结果表明，first首先受到Cd毒性的影响。这可能是由于组织的生理功能不同，以及g中存在硫代和甲烷营养共生细菌。在TO暴露的第一天，SOD和CAT受到抑制，尽管对照和暴露的贻贝中的TOSC和MT浓度相同。如在the中观察到的那样，在地幔中，酶促活化仅在6天后发生，并且在对照组和裸露的贻贝中，MT浓度没有发现显着差异。

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