榄香烯乳联合化疗对小鼠Lewis肺癌组织S100A4及MMP-9蛋白表达的影响

【目的】观察榄香烯乳联合化疗对Lewis肺癌的抑瘤作用及其对S100A4及MMP-9表达的影响,探讨其作用机制。【方法】将24只接种Lewis肺癌瘤株的C57BL/6小鼠随机分为肺癌模型组、化疗组、榄香烯乳组、榄香烯乳联合化疗组,每组6只。接种后第11天开始给药治疗,化疗组给予小鼠腹腔注射足叶乙甙(3 mg·kg~(-1)·d~(-1))、顺铂(3 mg·kg~(-1)·d~(-1)),榄香烯乳组给予小鼠腹腔注射榄香烯乳(100 mg·kg~(-1)·d~(-1)),榄香烯乳联合化疗组小鼠腹腔注给予射榄香烯乳(100 mg·kg~(-1)·d~(-1))、足叶乙甙(3 mg·kg~(-1)·d~(-1))、顺铂(3 mg·kg~(-1)·d~(-1))。连续给药7 d后,观察各组小鼠瘤体质量,脾脏、胸腺指数变化,计算抑瘤率及抑制转移率,采用酶联免疫吸附(ELISA)法检测瘤组织中S100A4蛋白和基质金属蛋白酶-9(MMP-9)含量,采用免疫组化法检测瘤组织中S100A4和MMP-9蛋白表达。【结果】与化疗组比较,榄香烯乳联合化疗组抑瘤率及抑制转移率均明显升高,肺癌小鼠脾脏指数、胸腺指数显著增加,瘤组织中S100A4和MMP-9含量明显降低,S100A4和MMP-9蛋白阳性表达率降低明显(P0.05或P0.01)。【结论】榄香烯乳联合化疗可抑制小鼠Lewis肺癌的生长转移,其机制可能与降低癌组织中S100A4、MMP-9蛋白的表达有关。

Effects of Elemene Combined with Chemotherapy on S100A4 and MMP-9 Protein Expression in Lewis Lung Carcinoma Mice

Objective To investigate the effects of elemene combined with chemotherapy on S100A4 and MMP-9 protein expression in Lewis lung carcinoma mice and to explore the possible mechanism. Methods Twenty-four mice inoculated with Lewis cells were randomly divided into 4 groups,including lung carcinoma model group,chemotherapy group,elemene group,and combination group,6 mice in each group. On day 11 after inoculation, the mice in chemotherapy group were given intraperitoneal injection of etoposide (3 mg·kg-1·d-1)and cisplatin (3 mg·kg-1·d-1),the mice in elemene group were given intraperitoneal injection of elemene (100 mg·kg-1·d-1), the mice in the combination group were given intraperitoneal injection of elemene (100 mg·kg-1·d-1),etoposide (3 mg·kg-1·d-1),and cisplatin (3 mg·kg-1·d-1). After 7-day continuous treatment,the tumor body mass, spleen index, thoracic gland index, growth-inhibition rate, and metastasis-inhibition rate in various groups were measured,the contents of protein S100A4 and matrix metalloproteinase 9 (MMP-9)in tumor tissues were determined by enzyme-linked immunosorbent assay (ELISA),and the protein expression levels of S100A4 and MMP-9 were detected by immunohistochemical staining. Results In the combination group, the growth-inhibition rate and the inhibitory rate of metastases were increased obviously, the spleen index and thoracic gland index were also increased, the contents of S100A4 and MMP-9 were decreased, and the protein expression rates of S100A4 and MMP-9 were reduced(P < 0.05 or P < 0.01 compared with the chemotherapy group). Conclusion Elemene combined with chemotherapy could inhibit the Lewis lung carcinoma growth and metastasis in mice, and the possible mechanism might be associated with the decrease of S100A4 and MMP-9 protein expression in the tumor tissues.