利用IGF-1基因敲除鼠乳腺癌模型研究IGF-1对血管生成的影响

目的探讨在低血清胰岛素样生长因子-1（IGF-1）水平与正常IGF-1水平的小鼠乳腺癌模型中应用血管生长抑制剂——人参皂甙（GS）Rg3后，IGF-1对血管生成的影响。方法应用7，12-二甲基苯蒽（DMBA）诱导肝脏特异性IGF-1基因敲除鼠（IAD鼠）及对照鼠建立原发乳腺癌模型，应用GSRg3进行干预治疗，利用免疫组化法检测乳腺癌组织中血管内皮生长因子（VEGF）和Ⅷ因子相关抗原（F8-RAg）表达水平，同时利用基因芯片技术检测小鼠乳腺癌及正常乳腺组织中相关基因的表达情况。结果LID鼠乳腺癌的发生率低于对照鼠（P〈0．05）；LID鼠乳腺癌组织中VEGF表达水平与微血管密度均低于对照组（P〈0．05）。LID鼠乳腺癌组织中IGF-1、成纤维细胞生长因子（FGF）1、肝细胞生长因子（HGF）和转化生长因子（TGF）-β1基因较对照组上调，成纤维细胞生长因子受体（FGFR）-2、血小板源性生长因子（PDGF）-A和PDGF-B基因较对照组下调；应用GSRg3后，LID鼠乳腺癌组织中VEGFa、表皮生长因子（EGF）、表皮生长因子受体（EGFR）、PDGF—A和FGFR-2基因较对照组上调，而IGF1和TGF-β1基因较对照组下调。结论IGF1促进小鼠乳腺癌的发生、发展，且与血管生长密切相关。血管生长抑制剂可能通过IGF-1及TGF-β1发挥抗肿瘤作用。

Study of Influence of IGF-1 on Angiogenesis by Using IGF-1 Deficient Mice Breast Cancer Models

Objective To determine the effect of insulin-like growth factor-1(IGF-1)on angiogenesis in mouse breast cancer model of lower and normal serum IGF-1 levels after using angiogenesis inhibitor ginsenoside Rg3(GS Rg3).Methods The breast cancer models were established in control mice and liver specific IGF-1 deficient(LID)mice by feeding DMBA and were treated with GS Rg3.Vascular endothelial growth factor(VEGF)and F8-RAg were detected by immunohistochemical method in breast cancer tissues.IGF-1 gene and angioge...