Melanocyte Stem Cell Activation and Translocation Initiate Cutaneous Melanoma in Response to UV Exposure.

Melanocyte Stem Cell Activation and Translocation Initiate Cutaneous Melanoma in Response to UV Exposure.
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DOI:
10.1016/j.stem.2017.09.001
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发表时间:
2017-11-02
期刊:
影响因子:
23.9
通讯作者:
White, Andrew C.
White, Andrew C.
中科院分区:
医学1区
文献类型:
--
作者:
Moon, Hyeongsun;Donahue, Leanne R.;Choi, Eunju;Scumpia, Philip O.;Lowry, William E.;Grenier, Jennifer K.;Zhu, Jerry;White, Andrew C.

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黑色素瘤是最致命的癌症之一,但肿瘤起源的细胞和机制仍不清楚。大多数黑色素瘤出现在没有前驱病变的透明皮肤上,但这些黑色素瘤是否可以从黑色素细胞干细胞(MCSC)中产生尚不清楚。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静止作为一种肿瘤抑制因子,并确定黑色素瘤启动的关键早期步骤所需的外在环境和分子因素。具体地,黑色素瘤起源于在紫外线-B(UVB)刺激下具有黑色素瘤活性的MCSC,紫外线-B(UVB)通过炎症依赖性过程诱导MCSC活化和易位。此外,皮肤中的染色质重塑因子Hmga 2在UVB介导的黑色素瘤发生中起关键作用。这些研究结果描绘了黑色素瘤形成的黑色素瘤主管MCSC外部刺激后,并表明,废除Hmga 2功能的微环境中可以抑制MCSC起源的皮肤黑色素瘤。
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 ultraviolet-B (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 suggest that abrogation of Hmga2 function in the microenvironment can suppress MCSC-originating cutaneous melanomas.
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发表时间: 2016-07-08
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