Cancer Res:研究表明注射肿瘤抑制因子激活剂直达病灶,大大降低毒副作用!

2017-05-23 枫丹白露 来宝网

科学家在“癌症研究”杂志上报道,用激活天然强大的肿瘤抑制剂的药物直接注射肿瘤可增强药物在局部及其传播地点攻击肿瘤的能力。



【直接注射肿瘤抑制激活剂可有效破坏肿瘤降低毒性】科学家在“癌症研究”杂志上报道,用激活天然强大的肿瘤抑制剂的药物直接注射肿瘤可增强药物在局部及其传播地点攻击肿瘤的能力。

佐治亚癌症研究中心免疫学家阎翠博士和美国佐治亚癌症研究中心教授Yan Cui博士表示,将这种药物,nutlin-3a与另外一种能够将身体感染病毒的药物包装在一起,可以提高肿瘤中已经存在的免疫细胞的反应。

直接递送还可减少毒性副作用,包括破坏健康血液和免疫细胞。

该研究的相应作者Cui说,“这不是没有药物的问题,这是我们如何更好地利用药物的问题。

Cui说,当我们健康时,静止的基因p53被称为守门人和看守者,当我们的身体受到挑战时,它具有关键的保护作用。基因水平响应于诸如DNA损伤的应激反应,如暴露于环境(例如来自太阳的紫外线),或者由于我们的细胞使用氧气而产生的氧自由基甚至接受癌症治疗如化学疗法时。

Cui说,“p53水平的增加表明一些事情是不正确的。

增加的水平意味着细胞在压力下会阻止过度增殖 - 一个癌症标志 - 并通过称为细胞凋亡的自然过程完成修复其DNA损伤或死亡。

“这就是为什么p53如此重要,” Cui说。 “如果它不起作用,你可以想象,我们在细胞中累积错误,这就是我们发展癌症的原因。”

但是与许多自然功能一样,癌症可以改变p53的目的。事实上,大约一半的癌症具有正常的p53,一半的癌症具有实际支持它们改变的错误版本。

如果p53无法帮助纠正或消除应激细胞,基因本身可以改变,从而开始促进癌症的慢性炎症。而不是纠正或杀死细胞,改变的p53也有助于癌症逃避免疫攻击。

在用于淋巴瘤和黑素瘤模型的研究中使用的Nutlin-3a通过抑制在许多肿瘤中过表达的天然p53抑制剂来起作用来激活更多的正常p53。

临床试验的早期结果令人失望,Cui说。另外,系统地给出了目前许多癌症治疗方法,它可以产生有毒结果,例如抑制骨髓,使得患者可能变得贫血或恶化,以及杀死潜在有益的免疫细胞。 “没有选择,”Cui说。

通过研究,科学家们将Nutlin-3a直接注入肿瘤。他们看着p53被激活,免疫细胞开始进入该区域。他们还观察到免疫细胞从原发肿瘤部位移动到肿瘤细胞所在身体的其他区域。肿瘤传播或转移是癌症致死的主要原因。

“你用这个来创造一个免疫激活的口袋,”她说,直接注射。 “你把免疫激活剂带入,他们清理(癌症)细胞,激活T细胞,这是真正的士兵,将出去杀死额外的肿瘤,我们可以看到小鼠肿瘤收缩。

他们的策略的另一部分是确保足够数量的免疫细胞进行攻击。淋巴瘤模型似乎具有已经在肿瘤内部的足够的免疫细胞,但是它们的测量在黑素瘤模型中显示低水平。所以他们还给出了poly-IC,一种合成版本的双链RNA,其与身体结合病毒感染并发送免疫细胞进行应答。

同事和研究共同作者Esteban Celis博士已经展示了poly-IC如何可以提高治疗性癌症疫苗的有效性,以及独立给予多IC可以产生有力的T细胞应答。科学家写道,加入poly-IC显着加强了攻击和肿瘤控制能力。

接下来的步骤包括添加他们的混合药物,在具有已经改变的版本的肿瘤中可以恢复正常的p53,他们希望将进一步扩大他们方法的未来治疗潜力。

原始出处:

Gang Guo, Miao Yu, Wei Xiao, et al. Local Activation of p53 in the Tumor Microenvironment Overcomes Immune Suppression and Enhances Antitumor Immunity. Cancer Res; 77(9); 2292–305. DOI: 10.1158/0008-5472.CAN-16-2832 Published May 2017.

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channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Wed May 24 06:43:36 CST 2017, time=2017-05-24, status=1, ipAttribution=)]
    2017-05-25 天涯183

    非常好的文章,学习了,很受益

    0

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  7. 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encryptionId=6dbc635680d, topicName=毒副作用)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=de89102, createdName=liuyong2980, createdTime=Sun Jan 14 19:40:00 CST 2018, time=2018-01-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=202461, encodeId=ecad2024610d, content=非常好的文章,学习了,很受益, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7LIiaRZTzJ3SEfiauCzTMPW7YvPPYLNJBXG9oh6Al1icq2VQQkIHWxqXehcicTS62YKJVBhxeth3wggw/0, createdBy=7ce01621306, createdName=天涯183, createdTime=Thu May 25 17:02:45 CST 2017, time=2017-05-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1532077, encodeId=9ac815320e76c, content=<a href='/topic/show?id=43d454921d1' target=_blank style='color:#2F92EE;'>#抑制因子#</a>, beContent=null, objectType=article, channel=null, 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channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Wed May 24 06:43:36 CST 2017, time=2017-05-24, status=1, ipAttribution=)]
    2017-05-24 日月生辉

    思路清晰,希望有效,学习了,

    0

  8. 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channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Wed May 24 06:43:36 CST 2017, time=2017-05-24, status=1, ipAttribution=)]
    2017-05-24 ylzr123

    认真学习,不断进步,把经验分享给同好。点赞了!

    0

  9. 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channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Wed May 24 06:43:36 CST 2017, time=2017-05-24, status=1, ipAttribution=)]
    2017-05-24 忠诚向上

    努力学习,多学知识

    0

  10. 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    2017-05-24 飛歌

    学习了很有用

    0

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