检验医学 ›› 2013, Vol. 28 ›› Issue (5): 425-429.DOI: 10.3969/j.issn.1673-8640.2013.05.020

• 基础研究.论著 • 上一篇    下一篇

正常与乳腺肿瘤细胞表面黏附分子CD44活化状态差异分析

侯利丹,刘鹥雯,何怡青,杨翠霞,杜艳,         高锋   

  1. 上海交通大学附属第六人民医院中心实验室,上海 200233
  • 收稿日期:2013-01-22 修回日期:2013-02-01 出版日期:2013-05-15 发布日期:2013-05-14
  • 通讯作者: 高锋,联系电话:021-64369181。
  • 作者简介:侯利丹,女,1988年生,硕士,主要从事肿瘤靶向治疗研究。
  • 基金资助:

    国家自然科学基金(No.81071814、81172027、81272479);上海市科委重点项目 (No.10411950500);上海市优秀学术带头人计划 (No.11XD1404000)

Analysis on the differences of surface adhesion molecule CD44 activation states in normal cells and breast tumor cells

  1. Department of Central Laboratory,Shanghai Sixth People′s Hospital,Shanghai Jiaotong University,Shanghai 200233,China
  • Received:2013-01-22 Revised:2013-02-01 Online:2013-05-15 Published:2013-05-14

摘要: 摘要: 目的 检测黏附分子CD44在正常和乳腺肿瘤细胞表面的表达,并分析其活化状态差异,为以CD44为靶点的肿瘤靶向治疗提供新的理论依据。 方法 采用流式细胞术检测20名正常人外周血单个核细胞(PBMCs)、正常小鼠胚细胞NIH3T3及人乳腺肿瘤细胞Hs578T、BT-549表面CD44表达水平;使用荧光标记透明质酸(FL-HA),通过流式细胞术分析CD44的活化状态;再运用细胞免疫荧光的方法观察HA与不同活化状态CD44的靶向结合情况。  结果 正常人PBMCs、NIH3T3与乳腺肿瘤细胞Hs578T、BT-549表面均高表达CD44,阳性表达率>95%。PBMCs、NIH3T3的CD44与FL-HA结合活性相对较低,分别为(3.61±2.65)% 和(14.33±1.35)%,而乳腺肿瘤细胞表面CD44与FL-HA结合活性高(>90%)。细胞免疫荧光显示NIH3T3细胞表面基本无荧光,HA不靶向结合CD44,而Hs578T和BT-549细胞表面呈现强荧光,HA靶向结合CD44。 结论 正常细胞PBMCs、NIH3T3表面虽然高表达CD44,但与其天然配体HA结合活性较低,而乳腺肿瘤细胞表面高表达CD44且与其配体HA结合活性很高。提示CD44分子在正常和肿瘤细胞表面存在相对静止与活化2种状态,前者与HA结合活性较低,后者与HA结合活性高。提示以HA为靶向分子、CD44为靶点的抗肿瘤药物,能够选择性杀伤高表达CD44的肿瘤细胞而不影响正常细胞。

关键词: CD44, 活化状态, 乳腺肿瘤, 外周血单个核细胞

Abstract: Objective To detect the expressions of surface adhesion molecule CD44 in normal cells and breast tumor cells, and analyze the differences of CD44 activation states in order to provide a new theoretical reference for CD44 targeted cancer therapy.  Methods The expressions of CD44 in normal peripheral blood mononuclear cells(PBMCs),normal mouse fibroblast NIH3T3 cells and human breast tumor cell Hs578T and BT-549 were determined by flow cytometry. The activation states of CD44 were analyzed by flow cytometry, using fluorescence-labeled hyaluronic acid(FL-HA), and then the targeted binding ability of HA-CD44 was observed by cell immunofluorescence. Results CD44 was abundantly expressed in normal PBMCs, NIH3T3 and breast tumor cell Hs578T and BT-549 (the positive expression rate was >95%). The binding ability of the breast tumor cell surface CD44 with FL-HA (>90%) was much stronger than those of PBMCs[(3.61±2.65)%] and NIH3T3[(14.33±1.35)%]. NIH3T3 cell showed almost no fluorescence(HA targeted binding without CD44), while Hs578T and BT-549 showed strong fluorescence (HA targeted binding with CD44)according to cell immunofluorescence.  Conclusions Normal cell PBMCs and NIH3T3 have high expressions of CD44 and low binding ability with HA, while breast tumor cell Hs578T and BT-549 have high expressions of CD44 and high binding ability with other HA. CD44 in normal cells and breast tumor cells shows 2 different activation states:inactive and active. The anti-tumor drugs with HA as targeted mononuclear and CD44 as target can select high-expression CD44 killer tumor cells and have no influence on normal cells.

Key words: CD44, Activation state, Breast tumor, Peripheral blood mononuclear cell