| 2,4-二氯苯酚致草鱼原代肝脏细胞凋亡及其作用机理研究 |
Alternative Title | Mechanism research on apoptosis induced by 2,4-DCP in primary hepatocytes of grass carp (Ctenopharyngodon idella)
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| 李慧 |
Thesis Advisor | 张迎梅
; 黄德军
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| 2013-11-30
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Degree Grantor | 兰州大学
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Place of Conferral | 兰州
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Degree Name | 博士
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Keyword | 2,4-二氯苯酚(2,4-DCP)
草鱼
原代肝细胞
细胞凋亡
B细胞淋巴瘤/白血病-2(Bcl-2)
Bcl-2相关X蛋白(Bax)
活性氧(ROS)
肿瘤坏死因子(TNF-α)
凋亡抑制蛋白(IAP)
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Abstract | 氯酚类化合物是一类主要的环境污染物,常被用作杀菌剂、农药和除草剂等,其在环境中特别是水体中能稳定存在。2,4-DCP作为氯酚类化合物的一种,主要用于除草醚、2,4-滴的合成,由于其大量用于工农业并被释放到环境中,不仅影响生物体的生长、发育和生殖,还可以在细胞和分子水平导致氧化应激、促使自由基的产生,影响相关基因的表达,甚至引起细胞死亡。
细胞凋亡是指程序性的细胞死亡,可由线粒体信号或死亡受体等介导发生。已有研究证明2,4-DCP可以诱导细胞凋亡,但其诱导细胞凋亡的信号途径和分子机制尚不清楚。本实验以草鱼的原代肝细胞为材料,通过测定2,4-DCP染毒后细胞的活力、细胞凋亡和线粒体膜电位,检测细胞内活性氧的含量及凋亡相关因子的mRNA表达情况,探讨了2,4-DCP诱导细胞凋亡的信号途径;通过加入线粒体保护剂ALC进一步验证了线粒体信号途径在2,4-DCP诱导细胞凋亡过程中的作用,最终揭示了2,4-DCP诱导细胞凋亡的具体途径及分子机制,为2,4-DCP毒性作用机理的研究提供一定的科学依据。本论文具体研究结果如下:
1. 2,4-DCP暴露可以抑制草鱼原代肝细胞的细胞活力。
2. 2,4-DCP暴露可以诱导草鱼肝细胞的凋亡。
3. 2,4-DCP暴露可以引起草鱼肝细胞线粒体膜电位的降低。
4. 2,4-DCP暴露可以导致草鱼肝细胞的ROS的产生。
5. 2,4-DCP暴露可以诱导草鱼肝细胞凋亡相关基因的改变。
6. ALC(5 mM)抑制了2,4-DCP导致的草鱼肝细胞的凋亡,并显著恢复了线粒体膜电位,降低了caspase-3、TNF-α和Bax mRNA的表达量以及Bax/Bcl-2 mRNA的比值。
7. 2,4-DCP暴露引起草鱼肝细胞IAP mRNA表达量的下降,但对草鱼IAP蛋白的表达没有影响。
以上结果表明:2,4-DCP诱导的草鱼肝细胞的凋亡是通过线粒体信号途径介导的。2,4-DCP染毒细胞后通过产生ROS引起氧化应激,降低线粒体膜电位,改变caspase-3和Bax mRNA的表达以及Bax/Bcl-2比值,最终导致细胞凋亡。 |
Other Abstract | 2,4-DCP can affect the growth, development, induce oxidative stress, change the expression of related genes and even lead to apoptosis.
2,4-DCP has been demonstrated to induce apoptosis, but the detailed mechanism remains unclear. Therefore, in this study the changes in grass carp hepatocytes exposed to 2,4-DCP were detected. Mitochondrial protective agent ALC was added to further explore the relationship of 2,4-DCP-induced apoptosis and mitochondrial pathway. The results were as follows:
1. 2,4-DCP inhibited the cell viability of grass carp primary hepatocytes.
2. 2,4-DCP induced apoptosis in grass carp hepatocytes.
3. 2,4-DCP decreased the Δψm of grass carp hepatocytes.
4. 2,4-DCP caused ROS production in grass carp hepatocytes.
5. 2,4-DCP changed the mRNA expression of apoptosis related genes in grass carp hepatocytes.
6. ALC inhibited the 2,4-DCP-induced apoptosis and significantly restored the Δψm, reduced caspase-3, TNF-α and Bax mRNA expression and the ratio of Bax/Bcl-2 mRNA.
In conclusion, the results reveals the 2,4-DCP-induced apoptosis pathway and its molecular mechanism, provides scientific research basis for the research of 2,4-DCP. |
URL | 查看原文
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Language | 中文
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Document Type | 学位论文
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Identifier | https://ir.lzu.edu.cn/handle/262010/222096
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Collection | 生命科学学院
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Recommended Citation GB/T 7714 |
李慧. 2,4-二氯苯酚致草鱼原代肝脏细胞凋亡及其作用机理研究[D]. 兰州. 兰州大学,2013.
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