项目名称: IL-24抑制Bcl-2亚硝基化诱导黑色素瘤细胞凋亡
项目编号: No.81202144
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 肿瘤学2
项目作者: 田卉
作者单位: 徐州医学院
项目金额: 23万元
中文摘要: 恶性黑色素瘤预后极差。白细胞介素24(IL-24)能诱导黑色素瘤细胞凋亡,而对正常细胞没有影响,成为极有应用前景的治疗方法,目前正进行III期临床实验。 申请者及国外研究均证实,IL-24通过下调抗凋亡蛋白Bcl-2表达,激活caspase信号通路,诱导黑色素瘤细胞凋亡。但IL-24下调Bcl-2的具体机制尚不清楚。 申请者预实验发现,IL-24可下调Bcl-2的亚硝基化水平。由此提出如下假说:IL-24通过下调iNOS抑制NO水平,使Bcl-2亚硝基化水平下调,进而促进Bcl-2泛素化降解,Bcl-2的下调最终激活caspase凋亡信号通路。本课题将从翻译后修饰角度,阐明IL-24诱导黑色素瘤细胞凋亡机制。
中文关键词: IL-24;Bcl-2;Caspase-3;去亚硝基化;细胞凋亡
英文摘要: Cutaneous malignant melanoma has the worst prognosis. Interleukin-24(IL-24) induces melanoma cell apoptosis without effect on normal cells, which is a promising cancer therapy for the phase III clinical trial. The applicant demonstrated IL-24 down-regulated Bcl-2 protein expression level, which further activated the caspase signal pathway, but the specific mechanism is still obscure. Our preliminary results showed IL-24 inhibited the Bcl-2 S-nitrosylation modification. So we put the following hypothesis: IL-24 down-regulates inducible nitric oxide synthase (iNOS), which subsequently suppresses Bcl-2 S-nitrosylation and facilitates Bcl-2 ubiquitination, resulting in melanoma cell apoptosis. This project will detect the specific mechanism of IL-24 inducing Bcl-2 down-regulation in melanoma cell apoptosis in term of the post-translational modification.
英文关键词: IL-24;Bcl-2;Caspase-3;S-denitrosylation;cell apoptosis