通过利用瘤对稳定突变p53的依赖来改善存活率,以进行治疗
E M Alexandrova1, A R Yallowitz1, D Li1
1Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA.
Nature
|May 27, 2015
概括
误解突变p53 (mutp53) 蛋白质驱动癌症的进展和化学抵抗. 针对由HSP90/HDAC6稳定的mutp53,有效地减少瘤生长,并在临床前模型中延长存活时间.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症遗传学 癌症遗传学
背景情况:
- 在p53中错误的突变会产生异常蛋白质,具有废除的瘤抑制功能和瘤性功能获取活动.
- 突变的p53 (mutp53) 蛋白在瘤中构成性稳定,促进恶性进展,入侵,转移和化学抵抗.
- 目前,全球有1100万患者的瘤表达高度稳定的mutp53,但其在体内治疗向仍然未被探索.
研究的目的:
- 调查突变p53 (mutp53) 是否在体内是一个可行的治疗点.
- 确定HSP90/HDAC6陪伴机械在mutp53稳定中的作用,并探索HSP90抑制作为治疗策略.
主要方法:
- 利用一种新的mutp53小鼠模型 (R248Q热点突变,floxQ) 进行他莫西芬诱导的mutp53切除.
- 对mutp53和p53的小鼠进行了HSP90抑制剂 (17DMAG+SAHA,ganetespib) 的使用.
- 评估了瘤生长,动物存活率,细胞亡和T细胞淋巴发育.
主要成果:
- 塔莫西芬诱导的mutp53切除抑制了瘤的生长,动物的存活率增加了37%,并诱导了晚期瘤的亡和回归.
- 长期的HSP90抑制显著延长了mutp53小鼠的生存时间 (Q/-为59%,H/H为48%),但不是p53的 littermates.
- 药物活性与mutp53降解,瘤亡和T细胞淋巴发育的预防相关.
结论:
- 持续的mutp53表达对瘤的维持和进展至关重要.
- HSP90/HDAC6机械是mutp53稳定的一个关键决定因素.
- 突变p53是一种可操作的,癌症特异性药物标,HSP90抑制显示出显著的治疗潜力.
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