感染卡氏肺孢子虫大鼠血清中可溶性细胞黏附分子-1（sICAM-1）变化的研究

目的 检测卡氏肺孢子虫肺炎(PCP)大鼠血清中可溶性细胞黏附分子-1（sICAM-1）水平, 以及经复方磺胺甲噁唑（TMP-SMZ）治疗后对sICAM-1含量的影响。 方法 纯系Wistar大鼠50只, 随机分为 PCP模型组（P组18只）、TMP?鄄SMZ治疗组（S组18只）及正常对照组（N组14只）。P组及S组于大鼠后腿肌肉注射地塞米松（1 mg/只，每周2次、间隔3 d），诱导建立PCP大鼠模型。N组同法注射生理盐水。镜检确认PCP诱导成功后，S组从第3周起灌胃TMP-SMZ[每天1次, 250 mg/（kg·d）］，5 d为1 疗程，间隔2周，共3个疗程。分别于第0、3、6、9及12周取血, 检测血清中sICAM-1水平，观察肺脏、肝脏病理及病原学变化。 结果 血清sICAM-1水平，P组第3周的(1.847±0.50)ng/ml显著低于第0周的（2.407±0.81) ng/ml(P<0.05)； S组第3周的(1.787±0.59) ng/ml显著低于第0周的（2.478±0.59) ng/ml(P<0.01), 以后逐渐上升。P组第9周的（3.233±0.83) ng/ml、 12周（3.984±0.87) ng/ml显著高于第0周的（2.407±0.81) ng/ml(分别为P<0.05, P<0.01)； S组第12周的（3.621±1.62) ng/ml显著高于第0周的（2.478±0.59) ng/ml(P<0.05)。P组与S组第9、12周[分别为(2.697±0.78) ng/ml及(3.621±1.62) ng/ml] 均显著高于N组(分别为P<0.05、P<0.01)。S组与P组间差异无统计学意义(P>0.05)。 结论 大鼠血清中sICAM-1含量较低，但在诱导PCP后其含量显著增高。

Study on the Changes of Soluble Intercellular Adhesion Molecule-1 Level in Sera of Rats Infected with Pneumocystis carinii

OBJECTIVES: To examine sICAM-1 in Pneumocystis carinii pneumonia (PCP) and the effect of TMP-SMZ therapy on its level and on pathological and immunological changes in rats. METHODS: 50 female Wistar rats were randomly divided into normal group (N group), PCP model group (PCP group) and TMP-SMZ therapy group (SMZ group). 1 mg of dexamethasone was injected intramuscularly twice a week for rats in PCP and SMZ groups to induce PCP. Normal saline was injected for N group in the same way. When the infection was confirmed, TMP-SMZ was given to rats in SMZ group by 25 mg/(kg.d) for 5 days for 3 courses with an interval of 2 weeks. sICAM-1 in serum was detected by ELISA, and the pathological changes in lungs and liver and the Pc in alveoli of lungs were observed. RESULTS: The level of sICAM-1 in PCP and SMZ groups at the 3rd week [(1.847+/-0.50) ng/ml, (1.787+/-0.59) ng/ml] was lower notably than that at 0 week [(2.407+/-0.81) ng/ml, [(2.478+/-0.59) ng/ml respectively] (P<0.05), and then increased gradually. It was significantly higher in PCP group at 9th week [(3.233+/-0.83) ng/ml] and at 12th week [(3.984+/-0.87) ng/ml] than that of 0 week (P<0.05). Its level in SMZ group at 12th week [(3.621+/-l.62) ng/ml] was also higher than that in 0 week [(2.478+/-0.59) ng/ml] (P<0.05). sICAM-1 level in both PCP and SMZ groups at 9th week and 12th week was higher than that of N group (P<0.05, P<0.01). There was no significant difference between SMZ and PCP groups at 9th week and 12th week (P>0.05). CONCLUSION: The sICAM-1 level in rats was low but significantly increases after the induction of PCP.