Up-regulation of Tropomyosin related kinase B contributes to resistance to detachment-induced apoptosis in hepatoma multicellular aggregations

Up-regulation of Tropomyosin related kinase B contributes to resistance to detachment-induced apoptosis in hepatoma multicellular aggregations
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原肌球蛋白相关激酶 B 的上调有助于抵抗肝癌多细胞聚集中脱离诱导的细胞凋亡

DOI:
10.1007/s11033-008-9299-z
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发表时间:
2009-05
影响因子:
2.8
通讯作者:
Yugang Liu
Yugang Liu
中科院分区:
生物学4区
文献类型:
--
作者:
Zhiyong Zhang;Lihui Han;Xiaohong Liang;Wensheng Sun;Yugang Liu

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为了阐明抗肿瘤诱导的细胞凋亡的分子机制,我们培养BEL 7402肝癌细胞在涂有聚(2-羟乙基甲基丙烯酸酯)的平板上,其阻断了细胞外基质的进入。BEL 7402肝癌细胞在悬浮状态下能自组装成聚集体,并能抵抗悬浮诱导的凋亡。TrkB在离体细胞上的表达明显高于贴壁细胞。蛋白质结构分析表明TrkB含有粘附结构域,可能与肝癌细胞的聚集形成有关。这些聚集体在BDNF处理下具有更高的增殖指数。这些数据表明,TrkB可能有助于通过促进多细胞聚集体的形成和诱导其抵抗肿瘤诱导的细胞凋亡的转移。
To elucidate the molecular mechanisms of resistance to detachment-induced apoptosis, we cultured BEL7402 hepatoma cells on plates coated with poly (2-hydroxyethyl methacrylate), which blocked access to the extracellular matrix. When BEL7402 hepatoma cells were suspended, they could self-assemble into aggregations and resist to detachment-induced apoptosis. Expression of TrkB on detached cells was much higher than that of attached ones. Protein structure analysis revealed that TrkB contained adhesion domain, which might contribute to the aggregation formation of hepatoma cells. These aggregations had higher proliferation indices with BDNF treatment. These data demonstrate that TrkB may contribute to metastasis by facilitating formation of multicellular aggregations and induce their resistance to detachment-induced apoptosis.
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