人类DNA藏数百万年前病毒 研究发现:能助抗癌
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▲“寄生”在人类DNA里的内源性反转录病毒(ERV)可能是对抗癌症的关键。(示意图/Piqsels)
科学家发现一种“寄生”在人类DNA数百万年的内源性反转录病毒(ERV),可能是对抗甚至预防癌症的关键。当人体体内癌细胞失控时,原本处于休眠状态的病毒就会被唤醒,同时帮助免疫系统精准攻击肿瘤。
据《BBC》报导,目前已知人类基因组序列中有5%至8%的反转录病毒,其中最古老的可追溯至数千万年前,最近的仅有数千年。英国弗朗西斯克里克研究所(Francis
Crick
Institute)在研究肺癌时发现,对抗包含新冠肺炎等感染疾病具重要作用的B细胞,于聚集在肿瘤周围过程存在某种特殊联系。
研究人员发现,这种无法完整复活的病毒残留物会被失控增长的癌细胞唤醒,并用目前还未清楚的机制,让侦测到病毒复活的免疫系统,“无意间”锁定与清除癌细胞,从而压制和阻止癌细胞进一步扩散。而讽刺的是,入侵DNA的反转录病毒可能是造成人类罹患癌症的最古老原因,但它现在却反过来帮助人体免疫系统打击癌细胞。
英国癌症研究中心布罗姆利博士(Claire
Bromley)指出,癌细胞有近乎无限的进化能力,导致现有医疗技术有时很难阻止癌细胞扩散,如果能厘清逆转录病毒帮助免疫系统清除癌细胞的关键原因,届时不只能对抗癌症,更可能研发出“预防性疫苗”,降低癌症对人类健康的威胁。
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