Cord blood stem cells inhibit epidermal growth factor receptor translocation to mitochondria in glioblastoma.

Cord blood stem cells inhibit epidermal growth factor receptor translocation to mitochondria in glioblastoma.
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DOI:
10.1371/journal.pone.0031884
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Tsung AJ
Tsung AJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Dasari VR;Velpula KK;Alapati K;Gujrati M;Tsung AJ

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EGFR 过度表达是多形性胶质母细胞瘤 (GBM) 最常诊断的遗传畸变之一。 EGFR 信号传导涉及多种细胞功能,并且取决于首选受体复合物的类型。最近在不同的癌症类型中报道了 EGFR 易位至线粒体。然而,迄今为止,GBM 中 EGFR 易位至线粒体的机制尚未得到评估。在本研究中,我们使用免疫组织化学、基于逆转录的 PCR 和蛋白质印迹技术分析了 GBM 患者来源的标本中 EGFR 的表达。在临床样本中,EGFR 与 FAK 共定位于线粒体中。我们评估了之前在标准神经胶质瘤细胞系和体内小鼠异种移植物中的观察结果。我们进一步分析了人脐带血干细胞(hUCBSC)对胶质瘤细胞和异种移植物中EGFR表达和EGFR信号传导的抑制作用。 hUCBSC 治疗抑制了神经胶质瘤细胞中 EGFR 的表达及其与 FAK 的共定位。此外,hUCBSC 抑制激活形式的 EGFR、FAK 和 c-Src 在神经胶质瘤细胞和异种移植物线粒体中的共定位。此外,hUCBSC 还在体外和体内抑制神经胶质瘤细胞中的 EGFR 信号蛋白。我们已经证明 hUCBSC 治疗可抑制 EGFR、FAK 和 c-Src 形式的磷酸化。我们的研究结果将 EGFR 表达及其在线粒体中的定位与 GBM 细胞中的特定生物学功能联系起来,并提供了可用于开发基于 hUCBSC 的有效疗法的相关临床前信息。
Overexpression of EGFR is one of the most frequently diagnosed genetic aberrations of glioblastoma multiforme (GBM). EGFR signaling is involved in diverse cellular functions and is dependent on the type of preferred receptor complexes. EGFR translocation to mitochondria has been reported recently in different cancer types. However, mechanistic aspects of EGFR translocation to mitochondria in GBM have not been evaluated to date. In the present study, we analyzed the expression of EGFR in GBM-patient derived specimens using immunohistochemistry, reverse-transcription based PCR and Western blotting techniques. In clinical samples, EGFR co-localizes with FAK in mitochondria. We evaluated this previous observation in standard glioma cell lines and in vivo mice xenografts. We further analyzed the effect of human umbilical cord blood stem cells (hUCBSC) on the inhibition of EGFR expression and EGFR signaling in glioma cells and xenografts. Treatment with hUCBSC inhibited the expression of EGFR and its co-localization with FAK in glioma cells. Also, hUCBSC inhibited the co-localization of activated forms of EGFR, FAK and c-Src in mitochondria of glioma cells and xenografts. In addition, hUCBSC also inhibited EGFR signaling proteins in glioma cells both in vitro and in vivo. We have shown that hUCBSC treatments inhibit phosphorylation of EGFR, FAK and c-Src forms. Our findings associate EGFR expression and its localization to mitochondria with specific biological functions in GBM cells and provide relevant preclinical information that can be used for the development of effective hUCBSC-based therapies.
DOI: 10.1371/journal.pone.0010350
发表时间: 2010-04-26
期刊: PloS one
影响因子: 3.7
作者:
Dasari VR;Kaur K;Velpula KK;Gujrati M;Fassett D;Klopfenstein JD;Dinh DH;Rao JS
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期刊: CANCER RESEARCH
影响因子: 11.2
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DOI: 10.1371/journal.pone.0011813
发表时间: 2010-07-28
期刊: PloS one
影响因子: 3.7
作者:
Dasari VR;Velpula KK;Kaur K;Fassett D;Klopfenstein JD;Dinh DH;Gujrati M;Rao JS
通讯作者: Rao JS