血管内皮生长因子受体抑制剂SU5416对小鼠肺间质纤维化的影响

目的 探讨血管内皮生长因子受体抑制剂SU5416在博来霉素所致小鼠肺间质纤维化炎症反应中的作用。方法 48只雄性C57BL／6小鼠随机分为对照组、模型组、SU5416早期处理组和SU5416晚期处理组。模型组和SU5416处理组予以博来霉素溶液（10mg／kg）气管内注射建立小鼠肺纤维化模型，对照组予以等体积生理盐水注射。SU5416处理组在造模后分两个阶段（早期：第1～14d；晚期：15～28d）予以SU5416溶液（50mg／kg）腹腔内注射，每周2次；对照组和模型组则予以等体积生理盐水注射。各组随机于造模后第14d和28d分两批处死，检测小鼠肺组织羟脯氨酸（HYP）、支气管肺泡灌洗液（BALF）中自细胞和乳酸脱氢酶（LDH）的变化。结果 与对照组同时间点比较，模型14d组肺组织HYP、BALF中自细胞数和LDH含量明显增高（P均〈0．01）；28d组肺组织HYP含量亦显著升高（P〈0．01），BALF中自细胞数和LDH含量无明显变化（P均〉0．05）。SU5416早期干预后增高的LDH、HYP和白细胞受到明显抑制（P均〈0．01）；晚期干预则没有明显作用。结论 早期予以SU5416可以抑制早期炎症反应，减轻肺间质纤维化。

Effect of SU5416 on the inflammation of pulmonary fibrosis in mice

Objective To explore the effects of SU5416,a vascular endothelial growth factor receptor (VEGFR) inhibitor,on inflammation in mice with bleomycin-induced pulmonary fibrosis.Methods C57BL/6 mice were randomly divided into four groups,ie. a control group,a bleomycin-induced pulmonary fibrosis (BPF) group,early intervention with SU5416 group (days 1-14,SE),and delayed intervention with SU5416 group (days 15-28,SD).Bleomycin (10 mg/kg) was instilled into the trachea of the mice to induce pulmonary fibrosis.After the instillation,SU5416 (50 mg/kg) was injected into the peritoneal cavities of the mice twice a week.The mice treated with bleomycin alone or with bleomycin followed by SU5416 were sacrificed on the day 14 and day 28 after the instillation of bleomycin.Lung tissues were taken and processed for determination of hydroxyl proline content.Bronchoalveolar lavage fluid (BALF) was collected for total and differential cell counts and measurements of lactic dehydrogenase (LDH) levels.Results It was found that the hydroxyl proline contents,the number of macrophages,and the LDH contents from the mice treated with bleomycin alone on day 14 were greatly increased.However,only the hydroxyl proline showed a significant increase in the mice treated with bleomycin alone on day 28.The number of macrophages,LDH contents,and hydroxyl proline contents were greatly reduced in the mice treated with bleomycin and early administration of SU5416 on day 14 when compared with those treated with bleomycin alone.But there were no significant differences in the above parameters of the mice treated with bleomycin and delayed administration of SU5416 on day 14.Conclusion This study indicates that early intervention by SU5416 might attenuate the fibrosis through inhibiting early inflammation in animal model of pulmonary fibrosis induced by bleomycin.