Cancer Discovery:利用新型分子靶向作用癌细胞生物钟来遏制癌症

2015-01-06 佚名 生物谷

近日,刊登在国际杂志Cancer Discovery上的一篇研究论文中,来自美国德州大学西南医学中心(UT Southwestern Medical Center)的研究人员通过研究利用名为6-thiodG的小分子就可以实现靶向作用端粒的目的,这种小分子可以利用细胞的生物钟来靶向作用并且杀灭癌细胞,抑制癌症发展。 研究者Woodring E. Wright教授表示,文章中我们发现名为6-巯基-2

近日,刊登在国际杂志Cancer Discovery上的一篇研究论文中,来自美国德州大学西南医学中心(UT Southwestern Medical Center)的研究人员通过研究利用名为6-thiodG的小分子就可以实现靶向作用端粒的目的,这种小分子可以利用细胞的生物钟来靶向作用并且杀灭癌细胞,抑制癌症发展。

研究者Woodring E. Wright教授表示,文章中我们发现名为6-巯基-2’-脱氧鸟苷的分子可以阻断培养液中癌细胞的生长,并且抑制小鼠机体中肿瘤的生长。研究者在研究中观察到,尽管6-thiodG处于低浓度状态,依然可以抑制一系列癌细胞系的生长,同时也会抑制癌症的发展。

6-thiodG分子可以通过一种特殊的作用机制来发挥功能,这种机制被认为是通过调节细胞处于活性的时间,即细胞的老化时钟,而这种生物钟通常是由DNA结构-端粒来定义的,一旦端粒缩短到了一个临界长度,细胞就不再分裂,而且细胞会通过细胞凋亡的方式死亡。

癌细胞则可以通过一种名为端粒酶的RNA蛋白复合物来免于死亡,端粒酶可以确保端粒不会随着细胞分裂而缩短,近年来端粒酶一直是癌症疗法领域研究的“宠儿”,研究人员常常利用阻断端粒酶的药物来杀灭癌细胞,抑制癌症发展,但这些药物的长期使用尽管诱发机体癌症细胞死亡,但同时也会对机体带来相当大的毒性。

6-thiodG分子可以当作端粒酶的底物,来破坏癌细胞正常维持端粒长度的途径,由于钙分子并不总是运用于端粒研究中,其也可以作为一种报警信号来帮助识别机体受损细胞,从而使得细胞阻断自身分裂,进入死亡阶段。研究者表示,更重要的是,6-thiodG分子并不像其它抑制端粒的化合物,我们在研究小鼠的血液、肝脏以及肾脏中均未发现严重的副作用产生,由于端粒酶在几乎所有的人类癌症细胞中都进行表达,本文研究对于开发新型手段来靶向作用表达端粒酶的癌细胞提供了新的思路,研究人员认为6-thiodG分子未来或许可以作为临床上用于抑制癌症发展的新型潜力分子。

原始出处

Ilgen Mender1,2, Sergei Gryaznov3, Z. Gunnur Dikmen2, Woodring E. Wright1 and Jerry W. Shay1,4.Induction of Telomere Dysfunction Mediated by the Telomerase Substrate Precursor 6-Thio-2′-Deoxyguanosine.Cancer Discovery.2014

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    2015-07-17 yahu
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    2015-12-13 cmj8wellington
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    2015-01-08 yxch36
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    2015-01-08 yankaienglish

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