基础医学与临床 ›› 2013, Vol. 33 ›› Issue (10): 1247-1251.

• 研究论文 • 上一篇    下一篇

C-KIT基因突变对血液祖细胞免疫表型及增殖的影响

杨颖1,刘华2,郑君芳3,郑帅1,史小翠1,马骞1,赵君朋1   

  1. 1. 首都医科大学
    2. 首都医科大学基础医学院生物化学与分子生物学系
    3. 首都医科大学 基础医学院 生化和分子生物学系
  • 收稿日期:2013-01-22 修回日期:2013-03-25 出版日期:2013-10-05 发布日期:2013-09-25
  • 通讯作者: 赵君朋 E-mail:jp75@163.com
  • 基金资助:
    国家自然科学基金项目;北京市教委面上项目;首都医科大学科研基金项目

Effect of C-KIT mutations on immunophenotype and proliferation of hematopoietic progenitors

  • Received:2013-01-22 Revised:2013-03-25 Online:2013-10-05 Published:2013-09-25

摘要: 目的 探讨不同C-KIT突变影响核心结合因子相关性急性髓系白血病(CBF-AML)发生的分子机制。方法 用流式细胞术鉴定稳定转染KIT野生型和突变型的EML细胞表面KIT的表达,比较各细胞系的免疫表型;WST-1法检测各细胞系在IL-3或Epo存在下的增殖状况,Western blot法检测Epo受体的表达。结果 外源人KIT在各类稳定转染的EML细胞系表面表达,Del417-419insY和D816V C-KIT突变均引起B220+细胞亚群减少以及Sca-1+细胞亚群增多,但后者作用更显著,二者未影响CD34、Gr-1、Mac-1和Ter119阳性细胞百分率;Del417-419insY突变体可以和IL-3、Epo协同促进细胞增殖,而D816V突变体只与IL-3有协同作用,经检测EML-D816V细胞不表达Epo受体。结论 不同C-KIT突变可以不同程度改变造血祖细胞免疫表型,协同其他造血因子促进细胞增殖,这提示其与CBF-AML的发生和临床预后的相关性。

关键词: C-KIT基因突变, 核心结合因子相关性急性髓系白血病, 造血祖细胞, 免疫表型, 增殖

Abstract: Objective To investigate the molecular mechanism through which different C-KIT mutations influence the development of CBF-AML. Methods Assessment of exogenous KIT receptor and differentiation antigens on the surface of stably transfected EML cells was performed with flow cytometry; Cell proliferation in the presence or absence of IL-3 or Epo was analyzed using WST-1 cell proliferation assay; EpoR expression in different cell lines was identified with Western Blot assay. Results Human KIT receptor was expressed on the surface of transfected EML cells, Del417-419insY and D816V mutations led to a decrease in percentage of B220+ cells and an increase in Sca-1+ cells, albeit to a more extent for D816V mutation. Neither of them influenced positive percentage of CD34, Gr-1, Mac-1 and Ter119 in different cells. Del417-419insY mutant can cooperate with IL-3 or Epo to promote cell proliferation, while only IL-3 had a synergic effect with D816V mutant. Western Blot result confirmed the absence of EpoR expression in EML-D816V cells. Conclusion Distinct C-KIT mutations may differentially alter immunophenotype of hematopoietic progenitors and enhance cell proliferation, suggesting their relationship with development and prognosis of CBF-AML.

Key words: C-KIT mutations, CBF-AML, hematopoietic progenitors, immunophenotye, proliferation

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