黏附分子CD44和ICAM-1在肺炎支原体感染BALB/c小鼠体内表达及相关机制

Expression of Adhesion Molecules CD44 and ICAM-1 in Mycoplasma Pneumoniae Infected BALB/c Mice and the Related Mechanisms

目的研究黏附分子CD44和细胞间黏附分子1(ICAM-1)在肺炎支原体(MP)感染的BALB/c小鼠模型的表达,阐明其与MP感染的关系。方法采用MP鼻腔滴入法建立BALB/c小鼠MP模型,观察MP小鼠肺部的病理变化。采用ELISA法测定5,8,15,20和30天MP感染小鼠血清和肺泡灌洗液中黏附分子CD44和ICAM-1的表达水平。结果与模型组比较,MP感染BALB/c小鼠后肺部炎症明显,MP感染BALB/c小鼠后其血清和肺泡灌洗液中黏附分子CD44和ICAM-1的表达明显上调(t_(5天血清CD44)=53.64ng/L,t_(5天BALF CD44)=144.3ng/L;t_(5天血清ICAM-1)=73.72ng/L,t_(5天BALF ICAM-1)=165.06ng/L,均P值<0.000;t_(8天血清CD44)=40.86ng/L,t_(8天BALF CD44)=21.31ng/L;t_(8天血清ICAM-1)=30.57ng/L,t_(8天BALF ICAM-1)=19.61ng/L,均P值<0.000)。结论 MP感染使小鼠黏附分子CD44和ICAM-1的表达水平升高,用替加环素治疗MP小鼠后CD44和ICAM-1表达下调,CD44和ICAM-1表达上调可能与MP肺炎的严重程度有关。

Objective To study the expression of adhesion molecules CD44 and ICAM-1 in BALB/c mice infected with Mycoplasma pneumoniae（MP）and elucidate the relationship between MP and infection.Methods BALB/c mouse MP model was established by MP nasal instillation,and the pathological changes of lung in MP mice were observed.The expression levels of adhesion molecules CD44 and ICAM-1 in serum and bronchoalveolar lavage fluid of mice infected with 5,8,15,20 and30 d MP were determined by ELISA.Results Compared with the model group,MP infected BALB/c mice after lung inflammation was significantly up-regulated MP,the expression in BALB/c mice infected with the serum and bronchoalveolar lavage fluid in CD44 and adhesion molecule ICAM-1（t5 dserum CD44=53.64 ng/L,t5 dBALF CD44=144.3 ng/L;t5 dserum ICAM-1=73.72 ng/L,t5 dBALF ICAM-1=165.06 ng/L,all P〈0.000;t8 dserum CD44=40.86 ng/L,t8 dBALF CD44=21.31 ng/L;t8 dserum ICAM-1=30.57 ng/L,t8 dBALF ICAM-1=19.61 ng/L,all P〈0.000）.The Mycoplasma pneumoniae infection increased the expression levels of adhesion molecules CD44 and ICAM-1 in mice.Conclusion After MP mice were cured,the expression of CD44 and ICAM-1 was down regulated,and the up regulation of CD44 and ICAM-1 expression might be related to the severity of MP pneumonia.