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Melanocyte Stem Cell Activation and Translocation Initiate Cutaneous Melanoma in Response to UV Exposure.
Cell Stem Cell ( IF 19.8 ) Pub Date : 2017-Nov-02 , DOI: 10.1016/j.stem.2017.09.001
Hyeongsun Moon 1 , Leanne R Donahue 1 , Eunju Choi 1 , Philip O Scumpia 2 , William E Lowry 3 , Jennifer K Grenier 1 , Jerry Zhu 1 , Andrew C White 1
Affiliation  

Melanoma is one of the deadliest cancers, yet the cells of origin and mechanisms of tumor initiation remain unclear. The majority of melanomas emerge from clear skin without a precursor lesion, but it is unknown whether these melanomas can arise from melanocyte stem cells (MCSCs). Here we employ mouse models to define the role of MCSCs as melanoma cells of origin, demonstrate that MCSC quiescence acts as a tumor suppressor, and identify the extrinsic environmental and molecular factors required for the critical early steps of melanoma initiation. Specifically, melanomas originate from melanoma-competent MCSCs upon stimulation by UVB, which induces MCSC activation and translocation via an inflammation-dependent process. Moreover, the chromatin-remodeling factor Hmga2 in the skin plays a critical role in UVB-mediated melanomagenesis. These findings delineate melanoma formation from melanoma-competent MCSCs following extrinsic stimuli, and they suggest that abrogation of Hmga2 function in the microenvironment can suppress MCSC-originating cutaneous melanomas.

中文翻译:


黑色素细胞干细胞的激活和易位引发皮肤黑色素瘤对紫外线照射的反应。



黑色素瘤是最致命的癌症之一,但其细胞起源和肿瘤发生机制仍不清楚。大多数黑色素瘤是从无前体病变的透明皮肤中产生的,但尚不清楚这些黑色素瘤是否可以由黑色素细胞干细胞(MCSC)产生。在这里,我们采用小鼠模型来定义 MCSC 作为黑色素瘤细胞起源的作用,证明 MCSC 静止充当肿瘤抑制因子,并确定黑色素瘤发生的关键早期步骤所需的外在环境和分子因素。具体来说,黑色素瘤在 UVB 刺激下起源于具有黑色素瘤活性的 MCSC,UVB 通过炎症依赖性过程诱导 MCSC 激活和易位。此外,皮肤中的染色质重塑因子 Hmga2 在 UVB 介导的黑色素瘤生成中发挥着关键作用。这些发现描述了具有黑色素瘤能力的 MCSC 在受到外部刺激后形成黑色素瘤,并且表明废除微环境中的 Hmga2 功能可以抑制 MCSC 起源的皮肤黑色素瘤。
更新日期:2017-10-12
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