Phenotypic characterization of metastatic anaplastic thyroid cancer stem cells.

Phenotypic characterization of metastatic anaplastic thyroid cancer stem cells.
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DOI:
10.1371/journal.pone.0065095
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Lin RY
Lin RY
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li W;Reeb AN;Sewell WA;Elhomsy G;Lin RY

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越来越多的证据表明,癌症干细胞(CSCs)可能在间变性甲状腺癌(ATC)中引发新的肿瘤,ATC是人类最具侵袭性的实体肿瘤之一。然而,CSCs在人类肿瘤发生中的作用尚未在经过验证的ATC细胞系中进行过研究。在这里,我们展示了CSCs在四种新验证的人类ATC细胞系(THJ-11T, THJ-16T, THJ-21T和THJ-29T)中的功能作用。我们使用球体形成试验鉴定和富集CSCs。四种ATC细胞系中约3%至9%的细胞形成甲状腺细胞。甲状腺细胞表达干细胞标志物NANOG和Oct4,并具有自我更新能力。将这些甲状腺球注射到NOD/SCID Il2rg-/-小鼠的甲状腺中,导致转移性肿瘤的形成,再现了人类ATC的临床特征。据我们所知,这是首次使用经过验证的人类ATC细胞系对甲状腺CSCs进行体内表征。疾病特异性甲状腺细胞的可用性和我们的原位肿瘤模型将有助于阐明CSCs的疾病机制和环境生态位。它们也可能用于临床前治疗筛选和监测生物疗法对ATC的影响。
Emerging evidence suggests cancer stem cells (CSCs) may initiate new tumors in anaplastic thyroid carcinoma (ATC), one of the most aggressive solid tumors in humans. However, the involvement of CSCs in human tumorigenesis has not been previously studied in authenticated ATC cell lines. Here we demonstrate a functional role of CSCs in four new validated human ATC cell lines (THJ-11T, THJ-16T, THJ-21T and THJ-29T). We identified and enriched CSCs using a spheroid-forming assay. About 3 to 9% of cells from four ATC cell lines formed thyrospheres. The thyrospheres expressed the stem cell markers NANOG and Oct4 and possessed the ability to self-renew. Injection of these thyrospheres into the thyroids of NOD/SCID Il2rg-/- mice resulted in the formation of metastatic tumors that recapitulated the clinical features of human ATC. To our knowledge, this is the first in vivo characterization of thyroid CSCs using validated human ATC cell lines. The availability of disease-specific thyrospheres and our orthotopic tumor models will enable the elucidation of disease mechanisms and the environmental niche of CSCs. They may also be useful for preclinical therapeutic screening and for monitoring the effects of biological therapies on ATC.
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