• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Antioxidant defense properties of Arctic amphipods: comparison between deep-, sublittoral and surface-water species
【24h】

Antioxidant defense properties of Arctic amphipods: comparison between deep-, sublittoral and surface-water species

机译：北极两栖动物的抗氧化防御特性：深水，近海和地表水物种之间的比较

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The toxic reactive oxygen species (ROS), produced naturally in an oxygenated environment, led to the development of antioxidant defenses by aerobic organisms to prevent tissue damage. Polar marine waters are regarded as a strongly prooxidant ecosystem, due to the high dissolved oxygen level and intense UV radiation during summer, while the deep waters are considered refuges against oxidative stress. In order to further elucidate the prooxidant and antioxidant forces associated with cold-water ecosystems and the implications of UV radiation, we sampled three amphipod species living at three different depths in the same water mass of the Arctic Ocean, characterized by low temperature (ca. 0degreesC), high oxygen level, and high ROS concentration in the surface water. The three species were the deep-sea amphipod Eurythenes gryllus, the benthic sublittoral amphipod Anonyx nugax and the surface-water species Gammarus wilkitzkii inhabiting the ice pack. The total oxyradical scavenging capacity (TOSC) was measured in the cytosolic fraction of the digestive gland and in the cell-free hemolymph of the three amphipod species. A significantly low TOSC toward peroxyl and peroxynitrite radicals (P<0.05) in E. gryllus compared with the shallow-water species (A. nugax) can be explained by the low metabolism of the deep-sea species. In the cell-free hemolymph, TOSC values are similar between E. gryllus and A. nugax, while in G. wilkitzkii a lower and higher TOSC toward hydroxyl and peroxynitrite, respectively, indicate specific adaptation to oxidative stress. Experimental exposure of A. nugax and G. wilkitzkii to H2O2 resulted in a significant change in TOSC (P<0.05) measured in the digestive gland and in the cell-free hemolymph of A. nugax, while no change (P>0.05) was noted in G. wilkitzkii. These data suggest that A. nugax is highly susceptible to oxidative stress and that G. wilkitzkii is characterized by a mechanism that prevents the diffusion of exogenous ROS through the gills or allows excretion of internal H2O2 through the gills to the environment.
机译：在有氧环境中自然产生的有毒活性氧（ROS）导致需氧生物发展出抗氧化剂防御能力，以防止组织受损。极地海水被认为是强氧化剂的生态系统，原因是夏季溶解氧水平高且紫外线辐射强，而深水被认为是抵抗氧化应激的避难所。为了进一步阐明与冷水生态系统相关的促氧化剂和抗氧化力以及紫外线辐射的影响，我们对生活在北冰洋同一水团中三个不同深度的三种两栖纲动物进行了采样，其特征是低温（ca. 0摄氏度），高氧含量和地表水中的高ROS浓度。这三个物种是深海两栖类两栖类Eurythenes gryllus，底栖近岸两栖类两栖类Anonyx nugax和居住在冰袋中的地表水种Gammarus wilkitzkii。在三种腺足动物的消化腺的胞质级分和无细胞血淋巴中测量了总的氧自由基清除能力（TOSC）。与深水物种（A. nugax）相比，灰质大肠杆菌中过氧化氢和过氧化亚硝酸根的TOSC明显较低（P <0.05），这可以解释为深海物种的新陈代谢低。在无细胞的血淋巴中，E。gryllus和A. nugax之间的TOSC值相似，而在G. wilkitzkii中，分别朝向羟基和过氧亚硝酸盐的TOSC较低和较高，表明它们对氧化应激具有特定的适应性。实验表明，牛粪曲霉和野生克氏杆菌暴露于H2O2会导致ASC消化腺和无细胞血淋巴的TOSC发生显着变化（P <0.05），而无变化（P> 0.05）。 G. wilkitzkii中提到的。这些数据表明A. nugax对氧化应激高度敏感，而G. wilkitzkii的特征在于可以防止外源性ROS通过the扩散或通过H将内部H2O2排泄到环境中。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号