Chemoresistance of glioblastoma cancer stem cells--much more complex than expected.

Chemoresistance of glioblastoma cancer stem cells--much more complex than expected.
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DOI:
10.1186/1476-4598-10-128
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发表时间:
2011-10-11
期刊:
影响因子:
37.3
通讯作者:
Beier CP
Beier CP
中科院分区:
医学1区
文献类型:
--
作者:
Beier D;Schulz JB;Beier CP

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胶质母细胞瘤(GBM)是研究实体恶性肿瘤中癌症干细胞(CSC)的范例。GBM CSC对标准化疗药物的敏感性是有争议的,因为现有文献提出了相互矛盾的实验数据。在这里,我们总结了GBM CSC对烷化剂耐药的实验证据,特别关注替莫唑胺(TMZ)。这些数据表明CSC对化疗本身既不耐药也不敏感。在所有研究中,去乙酰化蛋白如O 6-甲基鸟嘌呤-DNA-甲基转移酶(MGMT)赋予对CSC的强内在抗性。外部因素也可能导致CSC对TMZ的耐药性。这些可能包括脑实质中的TMZ浓度、TMZ给药方案、缺氧微环境、生态位因子和非干细胞重新获得干细胞特性。因此,CSC和化疗的相互作用比预期的更复杂,有必要考虑这些因素以克服患者的化疗耐药性。
Glioblastomas (GBM) are a paradigm for the investigation of cancer stem cells (CSC) in solid malignancies. The susceptibility of GBM CSC to standard chemotherapeutic drugs is controversial as the existing literature presents conflicting experimental data. Here, we summarize the experimental evidence on the resistance of GBM CSC to alkylating chemotherapeutic agents, with a special focus on temozolomide (TMZ). The data suggests that CSC are neither resistant nor susceptible to chemotherapy per se. Detoxifying proteins such as O6-methylguanine-DNA-methyltransferase (MGMT) confer a strong intrinsic resistance to CSC in all studies. Extrinsic factors may also contribute to the resistance of CSC to TMZ. These may include TMZ concentrations in the brain parenchyma, TMZ dosing schemes, hypoxic microenvironments, niche factors, and the re-acquisition of stem cell properties by non-stem cells. Thus, the interaction of CSC and chemotherapy is more complex than may be expected and it is necessary to consider these factors in order to overcome chemoresistance in the patient.
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