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c-Myc抑制剂10058-F4减轻脂多糖/右旋半乳糖胺诱导的小鼠急性肝损伤

c-Myc Inhibitor 10058-F4 Attenuates Lipopolysaccharide/D-galactosamine-induced Acute Liver Injury in Mice

  • 摘要: 本研究探讨c-Myc抑制剂10058-F4对脂多糖(lipopolysaccharide, LPS)和右旋半乳糖胺(D-galactosamine, D-Gal)诱导的急性肝损伤的影响及其可能机制。32只雄性BALB/c小鼠(Mus musculus)分为4组:正常对照组、 10058-F4组、 LPS/D-Gal组和10058-F4+LPS/D-Gal组。通过腹腔注射LPS/D-Gal诱导小鼠急性肝损伤,10058-F4在注射LPS/D-Gal前0.5 h经腹腔注入。注射LPS/D-Gal 1.5 h后处死小鼠并采集样本,分别采用实时荧光定量PCR法和ELISA法检测肝组织中肿瘤坏死因子-α(tumor necrosis factor-α, TNF-α)的mRNA水平和血清中TNF-α的水平。另取32只小鼠经上述相同处理后,注射LPS/D-Gal 6 h后处死并采集样本,检测小鼠血清中转氨酶活性及白介素-6(interleukin-6, IL-6)的水平、肝组织中IL-6的mRNA水平及肝组织中半胱氨酸天冬氨酸特异性蛋白酶(cysteinyl aspartate specific proteinase, Caspase),包括Caspase-3、Caspase-8和Caspase-9的活性,苏木精-伊红(hematoxylin-eosin, HE)染色观察肝组织病理学变化,TUNEL法检测肝细胞凋亡。结果显示,c-Myc抑制剂10058-F4可以显著下调LPS/D-Gal暴露小鼠血清中丙氨酸氨基转移酶(alanine aminotransferase, ALT)和天冬氨酸氨基转移酶(aspartate aminotransferase, AST)水平,降低血清和肝组织中的TNF-α与IL-6水平,抑制肝组织中Caspase-3、Caspase-8和Caspase-9的活性,减少TUNEL阳性细胞数以及肝组织病理学改变。以上结果提示,c-Myc抑制剂10058-F4可通过抑制炎症反应和减少肝细胞凋亡在LPS/D-Gal诱导的急性肝损伤中发挥保护作用。

     

    Abstract: This study is to investigate the effects of the c-Myc inhibitor 10058-F4 in acute liver injury induced by lipopolysaccharide(LPS) and D-galactosamine(D-Gal) and its underlying mechanism. 32 male BALB/c mice(Mus musculus) were randomly divided into four groups: control group, 10058-F4 group, LPS/D-Gal group and 10058-F4+ LPS/D-Gal group. Acute liver injury was induced by intraperitoneal injection of LPS/D-Gal, and 10058-F4 was injected intraperitoneally 0.5 h prior LPS/D-Gal. The mice were sacrificed at 1.5 h post LPS/D-Gal exposure, and the mRNA level of tumor necrosis factor-α(TNF-α) in liver and the level of TNF-α in serum were determined by quantitative real-time PCR and ELISA, respectively. Another 32 mice were prepared and undergone the same above-mentioned procedure, then sacrificed at 6 h post LPS/D-Gal exposure, and the levels of transaminases and interleukin-6(IL-6) in serum were determined. The mRNA level of IL-6 and the activities of cysteinyl aspartate specific proteinase(Caspase), including Caspase-3, Caspase-8 and Caspase-9 in li-ver were determined. In addition, hematoxylin-eosin(HE) staining was used to observe the histopathological changes and hepatocellular apoptosis was observed by TUNEL assay. The results showed that treatment with the c-Myc inhibitor 10058-F4 in LPS/D-Gal-exposed mice significantly decreased the levels of serum alanine aminotransferase(ALT) and aspartate aminotransferase(AST), decreased the mRNA levels of TNF-α and IL-6 in liver, and reduced the serum levels of TNF-α and IL-6. The 10058-F4-treatment also suppressed the acti-vation of Caspase-3, Caspase-8 and Caspase-9, reduced the count of TUNEL-positive hepatocytes and alleviated the degree of liver lesions. In conclusion, the c-Myc inhibitor 10058-F4 alleviated LPS/D-Gal-induced acute liver injury, these protective benefits might be associated with the compromised inflammation and suppressed apoptosis.

     

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