Science:肿瘤抑制蛋白p53调节细胞凋亡新机制

2015-08-04 佚名 生物谷

近日,发表在国际杂志Science上的一篇研究论文中,来自麻省理工学院等处的研究人员通过研究发现,蛋白p53或可通过免疫球蛋白死亡结构域1α (DD1α)来进行细胞凋亡机制的控制。 有机体为了存活,就会不断产生新的机体细胞来替代老化死亡的细胞,同时死亡细胞会持续性地被收集并且被移除体外;当机体的净化系统一旦“迷路”就会使得机体将死亡细胞视为外来入侵物,并且对其进行攻击最终引发多种类型的免疫疾

近日,发表在国际杂志Science上的一篇研究论文中,来自麻省理工学院等处的研究人员通过研究发现,蛋白p53或可通过免疫球蛋白死亡结构域1α (DD1α)来进行细胞凋亡机制的控制。

有机体为了存活,就会不断产生新的机体细胞来替代老化死亡的细胞,同时死亡细胞会持续性地被收集并且被移除体外;当机体的净化系统一旦“迷路”就会使得机体将死亡细胞视为外来入侵物,并且对其进行攻击最终引发多种类型的免疫疾病。研究者指出,作为正常清理系统的一部分,某种程度的免疫抑制会发生目的在于维护机体有序正常的清理代谢机制,但如何管理好这种流程研究者却并不清楚。

这项研究中,研究人员对p53蛋白进行了深入细致的研究,这种蛋白可以控制死亡细胞的清理,更为特殊的是,DD1α作为另外一种参与该过程的蛋白质,其或许可以帮助决定p53控制细胞死亡的分子机制。

深入研究p53的功能时,研究者就发现,p53实际上可以控制死亡细胞中DD1α的转录,同时还会控制T细胞和巨噬细胞(大部分为白细胞)中DD1α的转录,此外p53还可以作为一种细胞受体来发挥作用。为了检测DD1α在活的有机体中的效应,研究人员对多个实验室小鼠进行研究,使得DD1α在小鼠机体中受抑制,这样操作就可以使得损伤的死亡细胞被清理掉,研究者同时还发现,某些肿瘤细胞可以利用DD1α的功能来使其被T细胞所抑制。

研究结果表明,如果给予医生们一种可以控制自身免疫疾病患者机体中p53及DD1α的途径,或许就可以帮助患者有效清除机体的无用死亡细胞,从而来减缓患者的疾病症状。

原文出处:

Kyoung Wan Yoon1, Sanguine Byun1, Eunjeong Kwon1.et.al.Control of signaling-mediated clearance of apoptotic cells by the tumor suppressor p53.Nature.31 July 2015

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    2015-08-05 zhishijing
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    2015-08-05 jichang