首页|期刊导航|中华医学杂志（英文版）|Role of interleukin-8 in the progression of estrogen receptor-negative breast cancer
中华医学杂志（英文版）2007，Vol.120Issue(20)：1766-1772,7.
Role of interleukin-8 in the progression of estrogen receptor-negative breast cancer
Role of interleukin-8 in the progression of estrogen receptor-negative breast cancer
摘要
Abstract
Background Estrogen receptor (ER) is a very important biomarker of breast cancer. ER deletion has been consistently associated with tumor progression, recurrence, metastasis and poor prognosis, but the biological mechanism is still unclear. ER negative breast cancer expresses high levels of interieukin-8 (IL-8). ER expression can downregulate IL-8 promotor activity. As a multifunctional cytokine, IL-8 has many important biological activities in tumor genesis and development. With the goal of investigating the role of IL-8 in ER-negative breast cancer progression, we applied RNA interference technology to specifically knockdown the IL-8 expression in ER-negative breast cancer cell line MDA-MB-231.Methods Interfering pRNA-IL-8 and the control was transfected into ER(-) MDA-MB-231. The proliferation, cell apotosis,and invasive ability were recorded in transfected, untransfected and negative transfected cells. These cells were injected into nude mice to assess tumorigenicity, proliferation, metastasis and microvessel density (MVD).Results In vitro, decreased expression of IL-8 was associated with reduced cell invasion (P＜0.001), but had no effect on cell proliferation (P＞0.05). In vivo, neutrophils infiltration was significantly inhibited in pRNA-IL-8 transfected cells compared with untransfected and negatively transfected cells (P=0.001, P＜0.001). Less metastasis was found in transfected cells compared with negatively transfected cells (0% vs 80%, P=0.048). Nevertheless, we observed less MVD in transfected cells compared with control in nude mice (P＜0.001).Conclusions IL-8 inhibits ER-negative breast cancer cell growth and promotes its metastasis in vivo, which may be correlated with neutrophils infiltration induced by IL-8.关键词
breast cancer/ interleukin-8/ estrogen receptor/ RNA interferenceKey words
breast cancer/ interleukin-8/ estrogen receptor/ RNA interference分类
医药卫生引用本文复制引用
YAO Chen,LIN Ying,YE Cai-sheng,BI Jiong,ZHU Yi-fan,WANG Shen-ming..Role of interleukin-8 in the progression of estrogen receptor-negative breast cancer[J].中华医学杂志（英文版）,2007,120(20):1766-1772,7.基金项目
This work was supported by a grant from Guangdong National Science Foundation (No. 06300809) （No. 06300809）
