PNAS阻止癌症转移新武器:纳米材料+激光打断癌细胞的“腿”

2017-06-28 佚名 生物探索

近日,乔治亚理工学院Mostafa El-Sayed教授领导的一个研究小组开发出一种阻止癌症转移的新方法,研究人员利用一种名为光热治疗的方法破坏癌细胞的伪足,阻止细胞迁移,简而言之就是打断癌细胞的“腿”。这项研究于6月27日发表于PNAS上。



近日,乔治亚理工学院Mostafa El-Sayed教授领导的一个研究小组开发出一种阻止癌症转移的新方法,研究人员利用一种名为光热治疗的方法破坏癌细胞的伪足,阻止细胞迁移,简而言之就是打断癌细胞的“腿”。这项研究于6月27日发表于PNAS上。

对于癌症患者而言,最糟糕的状况莫过于癌转移,它是造成多数患者死亡的主要原因。近日,乔治亚理工学院Mostafa El-Sayed教授领导的一个研究小组开发出一种阻止癌症转移的新方法,研究人员利用一种名为光热治疗的方法破坏癌细胞的伪足,阻止细胞迁移,简而言之就是打断癌细胞的“腿”。这项研究于6月27日发表于PNAS上。

光热治疗是一种新兴的肿瘤治疗方法。通过将具有近红外光热转换的纳米材料,选择性累积到肿瘤部位,然后仅对肿瘤局部实施近红外光照,肿瘤细胞间和细胞内的纳米材料吸收近红外光,高效地转化为热能,可使肿瘤产生局部超高温度,从而将肿瘤细胞杀死。由于肿瘤周围正常组织纳米材料分布较少,因而保证了治疗中不会对正常组织造成损伤。不过,在这项新研究中,研究人员考察的不是光热治疗对癌细胞的杀伤作用,而是对癌细胞迁移能力的影响。

癌细胞的“腿”

许多人都认为细胞就像一个装了水的球——液体被包裹在细胞膜内,里面漂浮着各种细胞器。但这种描述是不完整的。事实上,细胞还具有细胞骨架这样的支撑网格,它们赋予细胞形态及功能。

比如,细胞骨架能够形成名为丝状伪足(filopodia)的刚毛突起,它从细胞边缘上的板状伪足(lamellipodia)上延伸出来。这些突起就好比细胞的“腿”,能够让细胞在组织内进行迁移。

但是,在恶性肿瘤中,正常的细胞功能被过度驱动。板状伪足和丝状伪足大量地过度产生。


在经过金纳米棒和近红外激光治疗后细胞形态的改变。图片来源:PNAS

黏在整联蛋白上的金纳米棒

光热治疗的核心部分就是具有超强光热转化效率的纳米材料。在贵金属纳米材料中,如金纳米颗粒,由于对光具有很强的表面等离子共振吸收效应,是理想的光热转化材料。

在这项新研究中,金纳米棒被一种名为RGD-peptides的分子包被,这种分子使金纳米棒能够特异性地粘附到一种名为整联蛋白(integrin)的细胞蛋白质上,阻断其功能,使其不能继续引导细胞骨架过度生产板状伪足和丝状伪足。因此,金纳米棒与整联蛋白的结合减缓了恶性细胞的迁移。更重要的是,由于一些特定的整联蛋白只有在癌细胞中才过量产生。因此健康细胞能幸运地逃脱金纳米棒的“制裁”。

激光加热金纳米棒

金纳米棒已经瞄准了癌细胞。接下来,研究人员用近红外(NIR)低能量激光轰击金纳米颗粒。这种光不被细胞吸收,但能被金纳米棒吸收。这些纳米材料吸收光能并将其转化为热能,杀死了与其相连的部分癌细胞,并破坏板状伪足和丝状伪足。

早期的动物实验中曾使用过更热的激光,但效果不太好。由于会引起炎症,因此可能只能加热一次。然而,一次的高温不能杀死所有的癌细胞,总会有些漏网之鱼存活下来,并可能在以后转移。

研究人员表示,新研究中的这种更加温和的激光不会烧伤皮肤或损伤组织,因此可以多次给药,更加彻底地阻止癌细胞迁移。


金纳米棒影响细胞迁移的机制。图片来源:PNAS

临床应用的可能性

研究人员目前想通过局部直接注射治疗头颈部,乳房和皮肤癌,并且他们使用的低能近红外激光可以轰击组织内2-3厘米深的金纳米棒。更深处的肿瘤需要在更深的部位注入纳米棒,因此后续可能需要光纤或者内窥激光。此外,将纳米棒直接注入血液中用于广泛治疗目前尚不可行。

在安全性方面,研究人员曾经进行过动物模型治疗的体内研究。研究显示,在治疗后15个月,金元素没有给小鼠造成明显的毒性。并且在一年后,治疗的小鼠仍然健康存活。


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    2017-10-11 drwjr
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    2017-06-30 yxch36
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    2017-06-30 oliver169
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一个52岁的女人,有乳腺癌病史在她的右髋疼痛轻微下降后。她的右髋关节的X线片(图1⇓)什么节目?回答X光片显示病变的小粗隆撕脱骨折(图2⇓)。有股骨近端透明,它代表着一个潜在的骨转移。讨论孤立的小粗隆撕脱骨折被认为在成人中是罕见的。1 2 3实际患病率是不确定的,但少于40例已在系列案件描述。2给出的不寻常的断裂位置在重大创伤的情况下,病理性骨折应考虑。该片应仔细研究任何潜在疾病的证据。在成人中,

Nat Mater:癌转移的两种行军方式

为了研究肿瘤细胞的侵袭机制,科学家们设计了一个微小的设备,将其作为细胞们的障碍赛场地。在上皮-间充质细胞转化(EMT)过程中,组织中彼此粘附的上皮细胞,会转变成为可以具有较强迁移能力的间充质细胞。在胚胎发育中EMT是一个有益的过程,细胞通过EMT在胚胎中移动并建立特化的组织。不过近年来人们发现,EMT也在癌转移中起到了关键性的作用。研究人员通过特殊的微观设备模拟肿瘤周围的组织,并让正在经历EMT的

PLoS One:发现一种可遏制癌细胞转移的基因

日本名古屋市立大学的一个研究小组在新一期的美国在线科学杂志《公共科学图书馆综合卷》上报告说,他们发现人体内一种基因拥有遏制癌细胞转移的功能,这将有助于弄清癌细胞转移的机制并开发出新药。 该校研究生院教授今川正良率领的研究小组注意到,一种名为“fad104”的基因与细胞移动等有关,因此通过实验调查了其是否与癌细胞的转移有关。该基因能促进脂肪细胞分化,在肺的形成过程中,还对II型肺泡

BBRC:km23-1可使延缓癌细胞扩散

immunostaining analyses were performed as described in Section 2, and representative photos are shown (400×).   宾夕法尼亚州立大学医学院研究人员近期发现,靶向作用km23-1蛋白可使癌细胞扩散的速度放缓。   Km23-1是一种动力蛋白,在细胞内起运输物质的作用,同时它还会参与细

Oncotarget:科学家鉴别出可促进乳腺癌发生转移的特殊靶向基因

一种特殊的人类基因突变体或可使乳腺癌细胞变得更加具有攻击性,从而使得乳腺癌细胞不仅对化疗产生耐药,而且使得原发性肿瘤开始扩散;近日来自维也纳医科大学的研究人员通过研究发现,名为AF1q的基因或可使得乳腺癌细胞变得更加具有侵略性,同时该基因或许也可以作为一种新型靶点来帮助开发治疗乳腺癌的靶向性疗法。 人类机体的AF1q基因是在染色体异常时发现的,而且该基因被认为是白血病发生的重要因子,同时研究