微囊藻毒素-LR对鸡肝脏的氧化损伤影响Oxidative Stress of Microcystin-LR on Liver of Chicken
张大文;袁丽娟;张莉;向建军;廖且根;罗林广;邱素艳;
摘要(Abstract):
蓝藻虽然能产生有毒的生物毒素,但是也含有较高的蛋白质。为探索蓝藻饲料化利用的可能性,本文通过腹腔注射的方式研究了微囊藻毒素-LR(MC-LR)对崇仁麻鸡的半数致死剂量(LD_(50))及其对肝脏的氧化损伤。实验设计了4个剂量组(对照组、5、10和20μg·kg~(-1)MC-LR),并在1、3、12、24和48 h检测了谷胱甘肽(GSH)含量以及谷胱甘肽S-转移酶(GST)、谷胱甘肽过氧化物酶(GPX)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性变化。结果表明,MC-LR对崇仁麻鸡的LD_(50)值为34.67μg·kg~(-1)体重(bw),95%的置信限为33.51~35.83μg·kg~(-1)bw。在MC-LR的作用下,鸡肝出现了氧化应激现象。3个染毒组鸡肝中GSH含量呈现先下降而后上升恢复至正常水平的趋势,GST酶活力表现为先上升而后下降至正常值的趋势,这说明GSH和GST共同参与了鸡肝中MC-LR的解毒;鸡肝中GPX酶活性在前3小时先保持不变(除了1 h的高剂量组),随即显著上升,这说明GPX和GSH共同参与了鸡肝中过量活性氧自由基(ROS)的清除,GPX可以作为监测MC-LR引起鸡毒性作用的生物标志物。CAT酶活力表现为先显著下降(P<0.05)而后快速上升至正常值的趋势,SOD酶在整个实验期间几乎保持稳定,这可能与SOD酶活性较高所致。
关键词(KeyWords): 微囊藻毒素;崇仁麻鸡;抗氧化酶;氧化损伤;肝脏
基金项目(Foundation): 国家自然科学基金青年科学基金项目(31500440);; 江西省青年科学基金计划项目(20143ACB21007)
作者(Author): 张大文;袁丽娟;张莉;向建军;廖且根;罗林广;邱素艳;
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