Cell:北京大学专家重大发掘!首次发掘一种植物免疫性蛋白或有望彻底治愈癌症!
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">癌症<span style="color: black;">是由于</span><span style="color: black;">反常</span>的细胞增殖所<span style="color: black;">导致</span>,其是世界上最<span style="color: black;">重点</span>的公共卫生问题之一。<span style="color: black;">近期</span>,一篇<span style="color: black;">发布</span>在国际杂志Cell上题为“A plant immune protein enables broad antitumor response by rescuing microRNA deficiency”的<span style="color: black;">科研</span>报告中,来自北京大学等<span style="color: black;">公司</span>的<span style="color: black;">专家</span>们<span style="color: black;">经过</span><span style="color: black;">科研</span><span style="color: black;">发掘</span>,一种特殊的植物<a style="color: black;">免疫</a>蛋白或能<span style="color: black;">经过</span>减缓microRNA(miRNA)的缺陷来实现广谱的抗肿瘤反应,其或有望<span style="color: black;">供给</span>一种<span style="color: black;">帮忙</span>抵御人类癌症的强大武器。</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic3.zhimg.com/80/v2-30a1254e1564f644e16b51be2ede24f6_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">专家</span>首次<span style="color: black;">发掘</span>一种植物免疫性蛋白或有望彻底治愈癌症。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">照片</span><span style="color: black;">源自</span>:Cell (2022). DOI: 10.1016/j.cell.2022.04.030</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">miRNA被认为与致癌过程密切<span style="color: black;">关联</span>,哺乳动物成熟的miRNA双链上存在一种2-nt 3端终端过剩,其能被Argonaute(AGO)蛋白识别并装载从而形成RNA所诱导的沉默复合体(RISC),并能调节靶向基因的表达,<span style="color: black;">实质</span>上,全面性的miRNA的剂量减少被认为是诱发癌症的<span style="color: black;">原由</span>。细胞周期的过度激活是癌细胞<span style="color: black;">反常</span>增殖的一个必要<span style="color: black;">前提</span>,然而让<span style="color: black;">科研</span>人员惊讶的是,<span style="color: black;">非常多</span>miRNAs能直接靶向<span style="color: black;">功效</span>并<span style="color: black;">控制</span>细胞周期基因从而<span style="color: black;">掌控</span>细胞增殖,<span style="color: black;">因此呢</span>,<span style="color: black;">经过</span>修复肿瘤中缺陷的miRNA通路或许能<span style="color: black;">做为</span>一种新型的肿瘤疗法来<span style="color: black;">控制</span>肿瘤细胞的增殖。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">与miRNA不同的是,siRNA<span style="color: black;">源自</span>于不同的RNA依赖性的RNA聚合酶(RDR)所合成的双链RNA底物,植物中RDR1依赖性的siRNA是一种独特的核心分子免疫反应通路,尤其是能够参与抗病毒免疫反应,<span style="color: black;">因此呢</span>,<span style="color: black;">科研</span>人员旨在从动物和植物免疫系统的差异出发,在哺乳动物中开展基于植物RDR1的植物遗传工程操作,并<span style="color: black;">科研</span>其在转化医学<span style="color: black;">行业</span>的应用。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">文案</span>中,<span style="color: black;">科研</span>人员介绍了<span style="color: black;">不可</span>有效结合AGO2复合体的1-nt-shorter 3’末端的miRNA异构体或许会在人类原发性癌症和癌细胞系的不<span style="color: black;">一样</span>本中广泛<span style="color: black;">累积</span>,<span style="color: black;">做为</span>异位表达的植物免疫性蛋白,RDR1能<span style="color: black;">经过</span>其单核苷酸尾部来修饰AGO2的这些双链游离性的miRNA异构体,从而重新激活缺陷的miRNA通路,并能特异性地阻断实体瘤和<a style="color: black;">白血病</a>中的癌细胞周期。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">科研</span>人员<span style="color: black;">发掘</span>,RDR1蛋白能<span style="color: black;">经过</span>靶向<span style="color: black;">功效</span>细胞周期来<span style="color: black;">控制</span>癌细胞的增殖,<span style="color: black;">科研</span>人员将拟南芥(At)和水稻(Os)的RDR1基因分别克隆到由Dox所诱导的慢病毒载体中,<span style="color: black;">同期</span><span style="color: black;">她们</span>验证了其在哺乳动物细胞中成功的异位表达,在分子水平上,基于RNA测序的基因富集分析结果(GSEA)<span style="color: black;">显示</span>,拟南芥和水稻中的RDR1能<span style="color: black;">干涉</span>所有癌细胞系的细胞周期过程,<span style="color: black;">同期</span>还不会对非癌变的对照细胞产生<span style="color: black;">显著</span>的<span style="color: black;">损害</span>效应,<span style="color: black;">科研</span>人员认为,RDR1是一种外源性的肿瘤<span style="color: black;">控制</span>子,其能特异性地靶向<span style="color: black;">功效</span>并<span style="color: black;">干涉</span>癌细胞的细胞周期,<span style="color: black;">同期</span>还不会影响非癌变细胞,拟南芥和水稻中的RDR1<span style="color: black;">针对</span>癌细胞的增殖有着广谱且特殊的<span style="color: black;">控制</span>特性,且并不会对非癌变细胞系产生<span style="color: black;">损害</span>影响。</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://pic1.zhimg.com/80/v2-24c916cb72103f26d30ff08295fd2a18_720w.webp" style="width: 50%; margin-bottom: 20px;"></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">照片</span><span style="color: black;">源自</span>:<a style="color: black;"><span style="color: black;">https://www.</span><span style="color: black;">cell.com/cell/fulltext/</span><span style="color: black;">S0092-8674(22)</span></a>00528-1?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867422005281%3Fshowall%3Dtrue</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3’末端的短1-nt miRNA异构体在多种肿瘤中会广泛<span style="color: black;">累积</span>,<span style="color: black;">科研</span>者提出,植物中的RDR1能<span style="color: black;">经过</span><span style="color: black;">增多</span>全面性的miRNA表达来<span style="color: black;">控制</span>细胞周期和细胞增殖,从而就能<span style="color: black;">经过</span>敲除和AGO2-CLIP的miRNA通路的<span style="color: black;">重要</span>组分来恢复癌细胞中miRNA的缺陷;而<span style="color: black;">经过</span>对<span style="color: black;">已然</span><span style="color: black;">发布</span>的miRNA测序数据及AGO2-IP的miRNA测序的系统性分析结果<span style="color: black;">显示</span>,<span style="color: black;">反常</span>的短1-nt双链miRNA异构体在癌细胞中进入AGO2或许并不是<span style="color: black;">那样</span>有效和稳定,<span style="color: black;">因此</span>这可能与不同肿瘤中miRNA剂量的减少<span style="color: black;">相关</span>。<span style="color: black;">另外</span>,<span style="color: black;">科研</span>者还<span style="color: black;">发掘</span>,RDR1能<span style="color: black;">经过</span>单核苷酸尾部来修复癌细胞中的miRNA异构体,<span style="color: black;">经过</span>进行体外生化实验,<span style="color: black;">科研</span>人员就能直接证明,rAtRDR1或能<span style="color: black;">经过</span>3’末端单核苷酸来修饰单链miRNA和携带1-nt或2-nt过剩的双链miRNA,但却并<span style="color: black;">不可</span>修饰携带平末端的双链miRNA。<span style="color: black;">科研</span>者<span style="color: black;">暗示</span>,<span style="color: black;">拥有</span>核苷酸转移酶活性的RDR1或能<span style="color: black;">经过</span>单核苷酸修饰从AGO2中分离出的短1-nt双链miNA异构体,从而恢复其对AGO2的装载效率,<span style="color: black;">最后</span>修复癌症中有缺陷的miRNA通路。最后,RDR1就能<span style="color: black;">控制</span>多种小鼠实体瘤和白血病的<span style="color: black;">发展</span>,<span style="color: black;">科研</span>人员在免疫缺陷和<span style="color: black;">身体</span>白血病的小鼠模型中验证了植物RDR1的抗肿瘤<span style="color: black;">功效</span>,最后,<span style="color: black;">经过</span>纳米囊泡包装和AAV装载的纯化RDR1蛋白就能分别在体外细胞和<span style="color: black;">身体</span>实体瘤水平上实现直接运输和对肿瘤的<span style="color: black;">控制</span>。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">综上,本文<span style="color: black;">科研</span>结果<span style="color: black;">显示</span>,<span style="color: black;">科研</span>人员首次<span style="color: black;">发掘</span>了<span style="color: black;">反常</span>的3’端短链1-nt miRNA异构体会在多种人类原发性肿瘤中进行<span style="color: black;">累积</span>,从而就为在肿瘤<span style="color: black;">出现</span>过程中miRNA剂量的全面下降<span style="color: black;">供给</span>了一个新的<span style="color: black;">科研</span>视角,而利用RDR1,<span style="color: black;">科研</span>人员或许就能<span style="color: black;">经过</span>修复癌细胞中的miRNA缺陷来实现广谱的抗肿瘤反应,并能<span style="color: black;">研发</span>出一种新型策略来编辑和操控miRNA,从而使其能<span style="color: black;">作为</span>一种有效抵御癌症的强大武器。(<a style="color: black;">生物谷</a>Bioon.com)</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">原始出处:</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">Ye Qi,Li Ding,Siwen Zhang,et al.<a href="<a style="color: black;"><span style="color: black;">https://www.</span><span style="color: black;">cell.com/cell/fulltext/</span><span style="color: black;">S0092-8674(22)</span></a>00528-1?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867422005281%3Fshowall%3Dtrue"> A plant immune protein enables broad antitumor response by rescuing microRNA deficiency, Cell (2022). DOI: 10.1016/j.cell.2022.04.030</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">免责声明:本文仅作信息交流,文中的观点不<span style="color: black;">表率</span>中肽生化立场,<span style="color: black;">也</span>不<span style="color: black;">表率</span>中肽生化支持或反对文中观点。本文<span style="color: black;">亦</span>不<span style="color: black;">形成</span>投资<span style="color: black;">意见</span>,<span style="color: black;">亦</span>不是<span style="color: black;">科研</span>治疗方案<span style="color: black;">举荐</span>。<span style="color: black;">倘若</span><span style="color: black;">必须</span><span style="color: black;">得到</span>治疗<span style="color: black;">方法</span><span style="color: black;">指点</span>,请前往正规医院就诊。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">文案</span><span style="color: black;">源自</span>:生物谷</p>
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