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Clin Cancer Res:又一款神药么?这个骨科药物居然能抑制脑胶质瘤

2018-05-01 Gsdtom 转化医学网

脑胶质瘤生长迅速、治疗困难、致死率高,确诊后平均生存时间仅为15-17个月。如果能够有效识别那些控制癌症生长和扩散的基因变化,那可能有助于查明新的药物靶点,并开发出更有效的治疗方法。

印度科学研究所(IISc)的研究人员发现了一种之前未曾有过报道、与脑胶质瘤有关的基因突变。

脑胶质瘤生长迅速、治疗困难、致死率高,确诊后平均生存时间仅为15-17个月。如果能够有效识别那些控制癌症生长和扩散的基因变化,那可能有助于查明新的药物靶点,并开发出更有效的治疗方法。

研究人员发现了一种与信号蛋白降钙素有关的生物通道,能抑制癌细胞的生长。当降钙素与癌细胞表面的受体结合时,产生的连锁反应能阻断癌细胞的生长与传播。研究发现,如果编码该受体的基因有突变的话,该患者的肿瘤恶性程度更高,生存时间也更短——大约只有3到4个月。


降钙素潜在治疗作用的说明

IISc微生物和细胞生物学部门的资深作者兼教授Kumar Somasundaram说:“如果肿瘤携带突变基因,患者疾病很可能更严重,临床治疗效果也很差。”

作者建议,作为通常意义上治疗骨病的药物,降钙素其实也可以与现有治疗相结合,用于携带正常基因的脑胶质瘤病人。这能提高疗效并延长病人生存时间。该研究与新德里印度医学科学院(AIIMS)的科学家合作进行,发表在《临床肿瘤研究》杂志上。

胶质瘤是成人中最致命、最常见的脑癌,代表致命星形细胞瘤的最后阶段(IV级)。星形细胞瘤产生于脑和脊髓的星形胶质细胞。肿瘤深入扩散到神经细胞周围的组织中,不能完全手术切除,放疗效果很差。

为探究哪些基因变化导致了肿瘤生长和扩散,研究小组分析了42名星形细胞瘤患者的全基因组,以及全球癌基因组图谱。最初,仅发现了一些已报道过的突变。随之研究的深入,他们发现了一种由各种信号分子和受体组成的特定通道。在一小部分胶质瘤患者身上,这条通道发生了严重突变,患者生存时间大大缩短(约3个月)。编码降钙素受体的CALCR基因,也在这条通道上发生了突变,并与生存时间缩短明显相关。

Jagriti Pal,IISc的第一作者和博士后研究助理。他说:“降钙素受体在骨钙吸收和肾脏钙排泄中举足轻重,但目前我们尚不知晓该受体在胶质瘤中的作用。”

为阐明受体功能,研究人员在实验室培育的、携带正常CALCR基因的癌细胞中加入了降钙素。结果,降钙素与细胞表面受体结合,激活了通道信号,阻断了癌细胞疯狂生长,限制了细胞扩散形成转移灶的能力。

通常,肿瘤干细胞能强力抵制治疗。研究小组也测试了降钙素对肿瘤干细胞的影响,发现了类似的抑制作用。另一项实验,他们将癌细胞植入老鼠的皮肤。待肿瘤生长后,将降钙素注入肿瘤。肿瘤生长同样被抑制。

Somasundaram说:“降钙素通常从鲑鱼中提取,用于绝经后的妇女,以提高骨骼强度。绝对安全,可以大量服用。可以考虑将降钙素作为传统治疗的辅助,包括手术、放疗和口服替莫唑胺。”

研究小组目前的研究是:降钙素结合放疗和替莫唑胺对小鼠肿瘤生长的影响。

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    2018-05-03 sunfeifeiyang

    学习

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    2018-05-03 神功盖世

    学习

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    2018-05-03 1209e435m98(暂无昵称)

    学习了.谢谢分享

    0

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    2018-05-02 明月清辉

    谢谢分享.学习了

    0

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    2018-05-02 易水河

    不走寻常路才能有新发现

    0

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    2018-05-02 神功盖世

    学习

    0

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    2018-05-02 871538379

    神奇的药物 多面能手

    0

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    2018-05-02 飛歌

    厉害了我的哥

    0

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