Biotechnol Biotec Eq:癌症存在的意义——或为进化上需要

2016-06-15 佚名 生物谷

最近两名科学家发表文章,认为癌症的本质并不是与我们作对,这一疾病事实上是进化上最终的一步,它是用来避免有瑕疵的基因传递到下一代,这可能揭示了癌症难以治愈的内在原因。当然,这仅仅是一个假设,并没有经过试验的验证,而且他们也不认为任何人死于癌症是顺理成章的事情。事实上正好相反,研究者们认为这一理念能够帮助我们更好地理解这一疾病,从而设计更加有效的治疗手段,比如免疫疗法等等。就这一观点,我们可以讨论一下

最近两名科学家发表文章,认为癌症的本质并不是与我们作对,这一疾病事实上是进化上最终的一步,它是用来避免有瑕疵的基因传递到下一代,这可能揭示了癌症难以治愈的内在原因。

当然,这仅仅是一个假设,并没有经过试验的验证,而且他们也不认为任何人死于癌症是顺理成章的事情。事实上正好相反,研究者们认为这一理念能够帮助我们更好地理解这一疾病,从而设计更加有效的治疗手段,比如免疫疗法等等。

就这一观点,我们可以讨论一下:为什么我们的身体想要杀死自己?这篇文章背后的依据是,每个人的体内都有一系列的安全守卫机制,这些机制能够避免我们的DNA发生突变后传递给新的细胞。

其中最重要的一个机制就是细胞凋亡,或者说程序性细胞死亡。如果细胞的DNA已经损伤到难以修复的地步,将会最终导致细胞凋亡,凋亡后的细胞能够快速地被免疫系统识别,从而通过吞噬的方式解决这一异物。

但最新的这一理论认为,当细胞凋亡等安全守卫机制不再一如往常般有效的时候,癌症将会出现,作为最终的守卫机制发挥功能。癌症的目的即在突变的细胞传递下去之前将其杀死,以摧毁整个生命为代价。

具有分裂能力的细胞需要受到至少4个安全检查机制的调控。

细胞凋亡在大多数情况下都能够发现细胞损伤,但有时候也会错过一些。当这种情况发生时,将会导致细胞不受控制地增长,甚至导致癌症。

听上去好像有些不靠谱,但是作者认为这跟衰老的机制是一样的,毕竟地球承受不了无休止的生命。

“癌症像是一个终极的进化机制,就像DNA修复以及凋亡一样,能够保护地球上的生命不至于灭绝"。也就是说,根治癌症的方法是不存在的。我们对待这种疾病的方法应该着重于延长患者的寿命以及生活质量。”


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    2016-06-30 shock_melon
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    2016-07-01 cathymary
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    2016-10-06 sunylz
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    2016-06-26 QQc8e60ecc

    天吶,我以前真的也那麽理解過

    0

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    2016-06-16 jihuaijun1112

    看上去还蛮有道理

    0

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    2016-06-16 深海的鱼

    新的观点,有意思

    0

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