肺炎克雷伯菌肝脓肿小鼠模型的建立

    Establishment of the Mouse Model of Klebsiella pneumoniae Liver Abscess

    • 摘要: 为构建稳定可靠的肺炎克雷伯菌肝脓肿(KPLA)动物模型,选取18 g左右健康ICR小鼠,以高毒力动物源肺炎克雷伯菌临床分离株KP001为造模菌株,分别从接种方式(灌胃、滴鼻和腹腔注射,接种菌数为1×107 CFU)和接种剂量进行摸索,并对造模成功小鼠的血清样品进行谷丙转氨酶、谷草转氨酶、碱性磷酸酶、γ-谷氨酰转移酶、白蛋白、乳酸脱氢酶、总胆红素等生化指标的测定。结果表明:灌胃小鼠存活率100%,但肝脏未出现脓肿;滴鼻小鼠死亡率100%,肺脏病变明显,40%死亡小鼠肝脏出现脓肿;腹腔注射1×106 CFU细菌后,小鼠存活率为75%以上,且存活小鼠肝脏均出现脓肿,成模率100%。病理切片显示造模成功小鼠肝细胞排列紊乱,中央静脉周围有大量炎性细胞浸润。生化指标检测显示,与对照小鼠相比,造模成功小鼠的血清样品中γ-谷氨酰转移酶极显著升高(P<0.01),碱性磷酸酶极显著下降(P<0.01),谷丙转氨酶、白蛋白显著下降(P<0.05)。综上分析表明,通过腹腔注射方式,接种1×106 CFU KP001菌株后可成功构建KPLA小鼠模型,γ-谷氨酰转移酶和碱性磷酸酶等生化指标可用于评估模型建立效果。

       

      Abstract: In order to construct a stable and reliable animal model of Klebsiella pneumoniae liver abscess (KPLA), about 18 g healthy ICR mice were selected, and the highly virulent animal-derived Klebsiella pneumoniae clinical isolated strain KP001 was used as the model strain. Then, the inoculation methods (including the gastric irrigation, nasal drip and intraperitoneal injection, with the number of inoculated bacteria was 1×107 CFU) and the inoculation dosage were explored. The biochemical indexes of serum samples from the mice with successful modeling were determined, including the alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, γ-glutamyl transferase, albumin, lactate dehydrogenase, and total bilirubin. The results showed that the survival rate of mice treated with gastric irrigation was 100%, but there was no abscess in the liver. The mortality rate of mice treated with nasal dripping was 100%, with obvious lung lesions, and the liver abscess occurred in 40% of the dead mice. After the intraperitoneal injection of 1×106 CFU bacteria, the survival rate of mice was more than 75%, and the liver abscesses appeared in the surviving mice, with the modeling rate of 100%. The pathological sections showed that the liver cells of the successfully modeled mice arranged in disorder, and a large number of inflammatory cells infiltrated around the central vein. The detection of biochemical indicators showed that compared with the control mice, the γ-glutamyl transferase in the serum samples of the successfully modeled mice was significantly increased (P<0.01), the alkaline phosphatase was significantly decreased (P<0.01), and the alanine aminotransferase and albumin were significantly decreased (P<0.05). In conclusion, the analysis showed that the KPLA mouse model could be successfully constructed by the intraperitoneal injection of 1×106 CFU KP001 strain. The biochemical indexes such as γ-glutamyl transferase and alkaline phosphatase could be used to evaluate the effect of model establishment.

       

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