J Clin Invest:基于新机理的肺癌治疗新药物即将进入临床试验!

2017-05-17 枫丹白露 Medicalxpress

【原型药物运用新机制治疗肺癌】细胞通过分子开关(磷酸分子)不断转化蛋白质,这些成分已经成为常见的药物靶点。在一项新研究中,通过直接激活肿瘤抑制蛋白的新型小分子在小鼠中预防了肺癌肿瘤。凯斯西储大学的Goutham Narla博士说:“我们目前治疗癌症患者的所有药物都是针对我们所谓的激酶,它将磷酸分子粘附到蛋白质上,但同样重要的是将磷酸盐关闭。” 一种酶-PP2A可以通过除去附着于其上的磷酸

细胞通过分子开关(磷酸分子)不断转化蛋白质,这些成分已经成为常见的药物靶点。在一项新研究中,通过直接激活肿瘤抑制蛋白的新型小分子在小鼠中预防肺癌肿瘤。凯斯西储大学的Goutham Narla博士说:“我们目前治疗癌症患者的所有药物都是针对我们所谓的激酶,它将磷酸分子粘附到蛋白质上,但同样重要的是将磷酸盐关闭。”

 
一种酶-PP2A可以通过除去附着于其上的磷酸盐分子来“关闭”肿瘤蛋白质。但根据纳尔拉博士的观点,“这种肿瘤抑制因子在几乎所有的主要癌症中都被关闭,其失活对于正常细胞成为癌细胞至关重要。”
 
纳拉和他的团队决定采用非常规的方法进行癌症药物开发,寻求直接靶向PP2A的分子,努力重新激活其肿瘤抑制物质。
 
包括来自青年科学家基金会的8名学生和Case Western Reserve医学院研究副院长Mark R. Chance博士领导的45名研究人员合作,筛选出一系列药物样分子,使其能够重新激活肺癌细胞PP2A,预防小鼠肺癌。原型药物分子由美国西班牙伊坎医学院副教授迈克尔·奥尔迈尔(Michael Ohlmeyer)博士颁发了FDA批准的药物。
 
该团队发现一种特定的原型药物可以附着于PP2A蛋白质的亚基,有效激活该酶。纳拉解释说,这项研究是第一个使用小分子直接激活去除磷酸盐分子的酶。 “有间接的方法可以获得这些酶,但这是直接激活一种酶的第一个例子,我们的药物实际上与PP2A结合并开启。
 
原型药物还防止肺癌细胞在实验室模型中增殖,包括小鼠模型。注射药物的小鼠肺癌肿瘤较少,并没有经历与其他癌症药物相关的体重减轻或行为异常。在小鼠模型中,该药物与目前可用于减缓肺癌进展的组合疗法相当有效。
 
为了确定药物在PP2A上的确切位置,研究人员还在推定的药物结合位点开发了具有特异性突变的肺癌细胞。由突变型癌细胞产生的肿瘤小鼠不能从原型药物中获益,因为药物不能附着于PP2A并重新激活PP2A。结果证实,原型药物在酶的亚单位内的两个特定氨基酸处连接到PP2A,可以帮助其他药物开发。
 
“这是一种直接结合并激活去除磷酸盐分子的酶的癌症药物的例子,因此我们的研究结果可广泛应用于治疗大量人类癌症,包括肺癌,正如我们在此展示的 “,纳拉说。
 
Narla指出:“关于PP2A在癌症中的作用有大约2000多篇论文。乳腺癌,前列腺癌,肺癌,脑癌,儿童期癌症,卵巢癌,子宫内膜癌,每个主要癌症都涉及这种蛋白质的失活。 “允许我们重新启动的分子,如我们研究中的分子,有可能在广泛的癌症患者中发挥作用。”
 
“我们正在继续在大量动物模型中测试我们的药物,如果继续下去,我们希望明年开始使用这种药物进行临床试验,我们的初步临床试验将相当广泛,包括多种癌症患者,如肺癌患者“。纳拉说。
 
该研究包括可能不一定转化为人类肺癌的临床前细胞和动物模型。小鼠植入肺癌肿瘤,而不是自己发展,然后用药物治疗四周。原型药物的长期影响仍然未知。


原始出处:

Jaya Sangodkar et al. Activation of tumor suppressor protein PP2A inhibits KRAS-driven tumor growth, Journal of Clinical Investigation (2017)

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    2017-05-26 Katherine123

    PP2A

    0

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    2017-05-18 luominglian113

    学习了,谢谢分享

    0

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Nature:科学家发现了干预肺癌恶化的关键所在

被称为腺瘤的良性肿瘤——肺腺癌是占美国肺癌病例约40%的侵袭性癌症。麻省理工学院生物学家现在确定了一种主要的转变,发生在腺瘤转移成腺癌的肺癌小鼠模型中。他们还发现阻止这种切换可以防止肿瘤变得更具攻击性。研究人员说,干扰这种转换的药物因此可用于治疗早期肺癌。

Nature:揭晓肺癌恶化关键,40%患者有望受益

近日,《自然》刊登了一篇重量级论文——来自MIT的研究人员发现了肺部肿瘤从良性转为恶性的关键,并且用一种药物,成功抑制住了这一转变过程。据信,这项研究有望造福多达40%的肺癌患者。▲研究人员在肿瘤中找到了具有干细胞活性的细胞(黄绿色亮点)(图片来源:MIT)肺癌是全球最主要的癌症杀手之一。根据美国癌症学会(American Cancer Society)发布的《2017癌症统计》,无论在男性还是女

梳理CAR-T细胞疗法研究新近进展

CAR-T(Chimeric Antigen Receptor T-Cell Immunotherapy),即嵌合抗原受体T细胞免疫疗法。该疗法是一种出现了很多年但近几年才被改良使用到临床中的新型细胞疗法。在急性白血病和非霍奇金淋巴瘤的治疗上有着显著的疗效,被认为是最有前景的肿瘤治疗方式之一。正如所有的技术一样,CAR-T技术也经历一个漫长的

聚焦精准医疗:臻和“全程全面管理”模式,有望为肺癌治疗带来新突破

2017年5月7日太原—鉴于近年来中国肺癌高发的严峻形势,旨在探索肺癌“全程全面管理”新模式的一场题为“聚焦ctDNA,开启肿瘤精准治疗”高峰论坛在太原拉开帷幕,该会议由致力精准医疗的臻和科技主办,汇聚了包括同济大学附属上海肺科医院周彩存教授和上海交通大学医学院附属瑞金医院张俊教授及来自全国众多的知名专家学者和教授的积极参与。臻和科技首席医学官张恒辉博士发言论坛上,臻和科技首席医院官张恒辉博士提出