首页> 外文期刊>Toxicon: An International Journal Devoted to the Exchange of Knowledge on the Poisons Derived from Animals, Plants and Microorganisms >Microcystin-LR induced apoptosis and mRNA expression of p53 and cdkn1a in liver of whitefish (Coregonus lavaretus L.)
【24h】

Microcystin-LR induced apoptosis and mRNA expression of p53 and cdkn1a in liver of whitefish (Coregonus lavaretus L.)

机译:微囊藻毒素-LR诱导白鱼肝细胞凋亡和p53和cdkn1a mRNA表达。

获取原文
获取原文并翻译 | 示例
           

摘要

There is growing evidence that adverse effects of microcystin-LR (MC-LR) are closely related to oxidative stress processes, free radicals and DNA damage, and involve major gene transcript changes. This study, utilizing gene expression analysis and plasma chemistries was the first to measure the effects of MC-LR in whitefish (Coregonus lavaretus L.), a feasible organism for pollution monitoring in aquatic systems. Fish were injected with different concentrations of MC-LR (0, 10 and 100 mu g/kg of body weight) and then sacrificed at either 0, 8, 24, 48 or 72h later, and their liver tissue were harvested for detailed investigation. Specifically, we were interested whether MC-LR is capable of: (i) modulating expression of two genes, tumor suppressor gene p53 and cdkn1a, p53 direct transcription target, and (ii) inducing apoptosis in whitefish liver. To study these effects, we developed a real-time qPCR assays useful for measuring both p53 and cdkn1a gene transcript levels in liver. To obtain necessary information for the study, either full-length p53 cDNA of whitefish (Wf-p53) was determined, using molecular cloning and rapid amplification of cDNA ends (RACE), or as for Wf-cdkn1a, specific primers were designed based on highly conserved regions of cdkn1a in fish. The Wf-p53 was found to share the same characteristics with a known p53 mRNA sequence of other vertebrates. Whitefish p53 amino acid sequence showed a high degree of homology with the sequences from fishes, amphibians, and mammals. The injection study showed that MC-LR at a higher dose, i.e. 100 mu g/kg body weight, up-regulated expression of p53 and cdkn1a genes in whitefish liver, as reflected by the continuous increase in their mRNA levels through the whole experiment. Furthermore, DNA fragmentation was observed in liver cells of whitefish after 24h of exposure to MC-LR (100 mu g/kg) that suggests the possibility of apoptosis. Finally, the study confirmed previous observations of severe injury of the liver and loss of normal organ functions as revealed by elevated levels of blood AspAT, AlaAT, and hepatosomatic index (HSI).
机译:越来越多的证据表明,微囊藻毒素-LR(MC-LR)的不良反应与氧化应激过程,自由基和DNA损伤密切相关,并且涉及主要的基因转录变化。这项利用基因表达分析和血浆化学方法进行的研究首次测量了MC-LR对白鱼(Coregonus lavaretus L.)的影响,白鲑是一种可行的水生系统污染监测生物。向鱼注射不同浓度的MC-LR(0、10和100μg/ kg体重),然后在0、8、24、48或72h处死,并收集其肝组织用于详细研究。具体而言,我们感兴趣的是MC-LR是否能够:(i)调节两个基因的表达,即抑癌基因p53和cdkn1a,p53直接转录靶标,以及(ii)诱导白鲑肝脏中的细胞凋亡。为了研究这些影响,我们开发了一种实时qPCR测定法,可用于测量肝脏中的p53和cdkn1a基因转录水平。为了获得研究所需的信息,使用分子克隆和cDNA末端的快速扩增(RACE)确定了白鲑的全长p53 cDNA(Wf-p53),或者对于Wf-cdkn1a,根据引物设计了特异性引物。鱼中cdkn1a高度保守的区域。发现Wf-p53与其他脊椎动物的已知p53 mRNA序列具有相同的特征。白鱼的p53氨基酸序列与鱼类,两栖动物和哺乳动物的序列显示出高度同源性。注射研究表明,MC-LR以更高的剂量(即100μg / kg体重)上调了白鲑鱼肝脏中p53和cdkn1a基因的表达,这可通过整个实验中其mRNA水平的持续提高来反映。此外,暴露于MC-LR(100μg / kg)24小时后,在白鲑的肝细胞中观察到DNA片段化,这提示了凋亡的可能性。最后,该研究证实了先前对肝脏严重损伤和正常器官功能丧失的观察结果,这通过血液中AspAT,AlaAT和肝体指数(HSI)的升高来揭示。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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