iNOS: a potential therapeutic target for malignant glioma.

iNOS: a potential therapeutic target for malignant glioma.
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DOI:
10.2174/1566524011313080002
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发表时间:
2013-09
影响因子:
2.5
通讯作者:
Bonni A
Bonni A
中科院分区:
医学4区
文献类型:
--
作者:
Jahani-Asl A;Bonni A

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胶质母细胞瘤是最具侵袭性的成人原发性脑肿瘤。尽管在了解这些肿瘤的分子机制方面已经取得了进展,但目前的治疗方法是无效的。最近的研究已确定 iNOS 是 EGFRvIII/STAT3 信号传导下游胶质细胞转化的关键调节因子,而 EGFRvIII/STAT3 信号传导是胶质母细胞瘤的关键致癌途径。 STAT3直接结合iNOS基因的启动子,从而刺激其表达。重要的是,通过遗传和药理学方法抑制 iNOS 可阻碍体内胶质细胞增殖、侵袭和肿瘤生长。 iNOS 表达在人脑肿瘤干细胞 (BTSC) 群体中也升高,并且 iNOS 是 BTSC 增殖和肿瘤发生所必需的。总之,这些发现表明 iNOS 靶向疗法的开发可能在胶质母细胞瘤的治疗中有价值。在这里,我们回顾了目前对 iNOS 信号在胶质母细胞瘤发病机制调节中的理解,以及 iNOS 抑制可能抑制这些破坏性肿瘤的恶性行为的潜在机制。
Glioblastoma is the most aggressive adult primary brain tumor. Although progress has been made in understanding the molecular mechanisms underlying these tumors, current treatments are ineffective. Recent studies have identified iNOS as a critical regulator of glial transformation downstream of EGFRvIII/STAT3 signaling, a key oncogenic pathway in glioblastoma. STAT3 directly binds the promoter of the iNOS gene and thereby stimulates its expression. Importantly, inhibition of iNOS by genetic and pharmacological approaches impedes glial cell proliferation, invasiveness, and tumor growth in vivo. iNOS expression is also elevated in a population of human brain tumor stem cells (BTSCs), and iNOS is required for BTSC proliferation and tumorigenesis. Together, these findings suggest that development of iNOS-targeted therapies may prove valuable in the treatment of glioblastoma. Here, we review our current understanding of iNOS signaling in the regulation of glioblastoma pathogenesis and the potential mechanisms by which iNOS inhibition might suppress the malignant behavior of these devastating tumors.
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