两种肝毒性化学物诱导的肝纤维化小鼠模型转录组学的比较研究
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1.上海中医药大学附属曙光医院肝病研究所;2.上海市中医临床重点实验室

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国家自然科学基金 (81874363、82174057、82274305、82205052),曙光四明学者计划(SGXZ-201910),山西中医药大学科技创新团队项目(2022TD2003)。


Comparative studies of transcriptomics in two murine liver fibrosis models induced by hepatotoxic chemicals
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1.Institute of Liver Diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine;2.Shanghai Key Laboratory of Traditional Chinese Clinical Medicine

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The National Natural Science Foundation of China (81874363、82174057、82274305、82205052), Shuguang Siming Scholar Plan(SGXZ-201910), Science and technology innovation team project of Shanxi University of Traditional Chinese Medicine(2022TD2003)

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    摘要:

    目的 比较四氯化碳(CCl4)和3,5-二乙氧基羰基-1,4-二氢可力丁(DDC)两种肝毒性化学物诱导的肝纤维化小鼠模型的转录组学差异,为使用肝纤维化小鼠模型的研究提供参考依据。 方法 分别采用10%CCl4腹腔注射和0.1%DDC饮食喂养诱导小鼠肝纤维化模型。造模4周后,检测血清ALT、AST、TBil水平;HE染色观察肝内炎症浸润情况;天狼猩红染色观察肝脏胶原沉积情况;Jamall's法测定肝组织羟脯氨酸(Hyp)含量;Elisa检测肝组织上清TNF-α、IL-6和IL-1β含量。提取小鼠总RNA进行测序(RNA-Seq),使用R软件分析2种肝纤维化模型的差异基因,并进行GO和KEGG富集分析,并验证差异显著的基因。结果 与正常小鼠相比,CCl4染毒小鼠和 DDC饮食小鼠血清ALT、AST、TBil水平和均肝组织TNF-α、IL-6和IL-1β含量显著升高,血清Alb水平下降。病理染色提示CCl4染毒小鼠肝组织结构破坏,中央静脉周围大量肝细胞玻璃样变及坏死;DDC饮食小鼠肝内卟啉沉积,大量炎症细胞在汇管区和胆管周围浸润;两种模型小鼠肝内均有不同程度胶原沉积。通过筛选条件(|logFC|>2倍且P<0.05)获得CCl4染毒模型、DDC饮食模型的差异基因分别为1820、2373个,其中上调基因分别为1302、1978个,下调基因分别为518、395个。GO注释发现2种模型在分子功能(MF)、生物学过程(BP)、细胞成分(CC)等方面具有重要功能,KEGG分析发现CCl4染毒模型、DDC饮食模型分别激活22、29条信号通路,其中细胞外基质受体的相互作用、细胞周期、蛋白的消化与吸收、焦点粘附、PI3K-Akt 等16条信号通路在2种模型中均显著富集(P<0.05)。聚类分析发现在2种模型中均明显下调基因包括Mup11、Mup15、Mup17、Mup1等,采用RT-qPCR得以证实(P<0.05)。结论 本研究报道了CCl4染毒和DDC饮食两种肝纤维化模型的RNA-Seq转录组学特点并进行比较,观察基因表达的场所、基因表达所调节的通路等方面,为后续肝纤维化的发病机制和治疗研究的动物模型的选择提供参考依据。

    Abstract:

    Objective To compare the transcriptomic differences between carbon tetrachloride (CCl4)-induced and Diethyl 1,4-dihydro-2,4,6-trimethyl-3,5-pyridinedicarboxylate (DDC) diet-induced mouse models of liver fibrosis in order to provide a framework for future research utilizing mouse liver fibrosis models. Methods Mouse models of liver fibrosis were induced by 10%CCl4 (2ml/kg) injection and 0.1%DDC diet, respectively. After the 4 -week induction, the serum levels of ALT, AST, and TBil were detected. HE and Sirius red staining were observed to analyze the hepatic inflammation and collagen deposition. Jamall's method was used to evaluate the hydroxyproline (Hyp) content in the liver tissues. Hepatic tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-1β (IL-1β) were measured by the elisa kits. Total RNA was extracted from murine liver tissues for RNA sequencing (RNA-Seq). The differentially expressed genes of the two models were analyzed by R software and then GO and KEGG enrichment were analyzed. Then, cwas used to verify the significantly different genes. Results Compared with normal mice, the serum levels of ALT, AST, TBil and the expressions of hepatic TNF-α, IL-6 and IL-1β were significantly increased in mice received CCl4-induction and DDC diet mice respectively, while the serum level of Alb was decreased. Pathological staining showed that the structures of liver tissues were destroyed and a large number of hepatocytes around the central vein were hyalinized and necrotic in CCl4-treated mice. In DDC diet mice, a lot of porphyrins were deposited in the liver and a large number of inflammatory cells were infiltrated in the portal area and the bile duct. Different degrees of collagen deposition were observed in the liver tissues of the two model mice. Different genes(DEGs) of CCl4-treated and DDC-diet mice were screened according to a filter (|logFC|> 2 times and P < 0.05). 1820 and 2373 DEGs in CCl4-treated and DDC-diet were analyzed, including 1302 and 1978 up-regulated genes , 518 and 395 down-regulated genes, respectively. GO annotation showed that the two models had important functions in molecular function (MF), biological process (BP) and cell component (CC). KEGG analysis showed that 22 and 29 signaling pathways were activated in CCl4-induction and DDC diet model, respectively. Among these, 16 signaling pathways such as extracellular matrix receptor interaction, cell cycle, protein digestion and absorption, focal adhesion, and PI3K-Akt were significantly enriched in the two models (P < 0.05). Cluster analysis showed that Mup11, Mup15, Mup17, Mup1 were significantly down-regulated in both models, which were identified by RT-qPCR (P < 0.05). Conclusions This study reported and compared the RNA-Seq transcriptomic characteristics of liver fibrosis models induced by CCl4-induction and DDC-diet, respectively. By observing the locations of gene expression and the pathways regulated by the genes, an example was established for the subsequent selection of animal models to study the pathogenesis and treatment of liver fibrosis.

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  • 收稿日期:2023-11-03
  • 最后修改日期:2023-12-18
  • 录用日期:2024-05-21
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