孕激素诱导成人乳腺干细胞扩张
Purna A Joshi1, Hartland W Jackson, Alexander G Beristain
1Ontario Cancer Institute, Department of Medical Biophysics and Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto M5G 2M9, Ontario, Canada.
Nature
|May 7, 2010
概括
孕激素在生殖周期期间显著扩大乳腺干细胞 (MaSCs),增加乳腺癌风险. 这突出了孕激素的突出.
科学领域:
- 生殖生物学 生殖生物学
- 癌症研究 癌症研究
- 干细胞生物学 干细胞生物学
背景情况:
- 生殖史是一个关键的乳腺癌风险因素,与卵巢激素周期有关.
- 连接生殖周期与乳腺癌倾向的潜在机制尚不清楚.
- 乳腺干细胞 (MaSCs) 存在于受监管的利基领域,并与癌症发病有关.
研究的目的:
- 调查卵巢激素,特别是孕激素在调节乳腺干细胞 (MaSC) 稳定中的作用.
- 了解在生殖周期中的MASC动态如何有助于乳腺癌风险.
主要方法:
- 在生殖周期的不同阶段在小鼠中量化MASC池扩张.
- 管理外源性孕激素,以评估其对MASC种群的直接影响.
- 分析了MASC和周围细胞中的基因表达和细胞标记物.
主要成果:
- 在高峰孕激素水平 (dioestrus阶段) 期间,MASC池增加了14倍.
- 外源性孕激素的使用模仿了这种扩张,证实了它的作用.
- 年龄较大的小鼠在生殖周期停止后显示MASC停滞.
- 孕激素信号涉及Wnt4和RANKL,导致MASC的激活和扩散.
结论:
- 孕激素在生殖周期期间在乳腺干细胞利基内动态激活成年MASCs.
- 这种由孕激素驱动的MASC扩张为细胞转化和乳腺癌发展提供了潜在的窗口.
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