肺纤方颗粒对盐酸平阳霉素致肺间质纤维化大鼠血清转化生长因子β1和血小板衍生生长因子的影响

目的：观察肺纤方颗粒抗大鼠肺间质纤维化的作用，及其对大鼠血清转化生长因子β1（transforming growth factor-β1，TGF—β1）和血小板衍生生长因子（platelet—derived growth factor，PDGF）的影响。方法：72只雄性Wistar大鼠经气管插管灌注盐酸平阳霉素1mg／kg复制大鼠肺间质纤维化模型，随机分入模型组、泼尼松组和肺纤方组，每组24只；15只雄性Wistar大鼠经气管插管灌注等体积生理盐水作为假手术组。造模后24h开始常规灌胃给药．泼尼松组给予醋酸泼尼松5mg／kg．肺纤方组给予肺纤方颗粒1．25g／kg，模型组和假手术组给予等体积生理盐水．1次／d。分别于第14、28、45天取材，假手术组每批5只，其余各组每批8只。检测其肺组织病理改变及血清中TGF-β1和PDGF的水平。结果：与模型组和泼尼松组比较，在第45天时病理检测显示肺纤方组肺间质纤维化的程度较轻；血清TGF—β1和PDGF检测结果显示，模型组大鼠两种因子水平升高。第45天时升高最明显，并高于假手术组（P〈0．05）。肺纤方组与泼尼松组的TGF-β1变化与模型组相似（P〉0．05），两组间TGF—β1变化比较差异无统计学意义（P〉0.05）。肺纤方组PDGF水平在第14天时与其余各组比较显著升高（P〈0．01）。然后持续下降，至第45天与假手术组接近（P=0．792）；而模型组和泼尼松组PDGF水平皆随时间延长逐渐上升，第45天时均显著高于假手术组（P〈0．01）。结论：肺纤方有一定的减轻盐酸平阳霉素致大鼠肺间质纤维化的作用，其作用机制可能与对血清PDGF水平的调节作用有关。

Influence of Feixian Formula on serum transforming growth factor-β1 and platelet-derived growth factor in rats with bleomycin-induced pulmonary fibrosis

OBJECTIVE: To observe the effects of Feixian Formula, a compound traditional Chinese herbal medicine for treating pulmonary fibrosis, on bleomycin-induced pulmonary fibrosis in rats, and its influence on serum transforming growth factor-beta1 (TGF-beta1) and platelet-derived growth factor (PDGF). METHODS: Seventy-two male Wistar rats were infused with bleomycin (1 mg/kg) through tracheal intubation to induce pulmonary fibrosis, and they were randomly divided into untreated group (n=24), prednisone-treated group (n=24) and Feixian Formula-treated group (n=24). Fifteen male Wistar rats of the sham-operated group were infused with equivalent normal saline. Twenty-four hours after operation, prednisone (5 mg/kg) and Feixian Formula (1.25 g/kg) were given to the prednisone-treated group and Feixian Formula-treated group respectively by intragastric administration once a day. Equivalent saline was administered to rats of the untreated group and sham-operated group. On the 14th, 28th and 45th day, 5 rats in the sham-operated group and 8 rats in each of the other three groups were dissected to observe pathologic changes of the lung tissues, and the levels of serum TGF-beta1 and PDGF were determined by enzyme-linked immunosorbent assay. RESULTS: At the 45th day, the degree of pulmonary interstitial fibrosis was lesser in rats of the Feixian Formula-treated group as compared with those of the untreated group and prednisone-treated group. The levels of serum TGF-beta1 and PDGF were increased, and were significantly higher than those of the sham-operated group, especially on the 45th day (P<0.05). Changes of TGF-beta1 level in the prednisone-treated group and the Feixian Formula-treated group were similar to untreated group (P>0.05), and there was no significant difference between the prednisone-treated group and the Feixian Formula-treated group (P>0.05). PDGF in the Feixian Formula-treated group reached the highest level on the 14th day, significantly higher than those of the other three groups (P<0.01). Then it decreased, and was close to that of the sham-operated group on the 45th day (P=0.792). The levels of PDGF in untreated group and prednisone-treated group were increased depending on time, and were obviously higher than that of the sham-operated group on the 45th day (P<0.01). CONCLUSION: Feixian Formula can relieve bleomycin-induced pulmonary fibrosis in rats, and the mechanism of its action may be related to down-regulating serum PDGF.