esc0rp 发表于 2024-6-28 01:47:06

川大华西新科研发掘癌症治疗新靶点


    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">5月16日,川大华西<span style="color: black;">科研</span>团队在期刊《Molecular Cancer》上<span style="color: black;">发布</span>了<span style="color: black;">科研</span>论文,题为“DNMT1-targeting remodeling global DNA hypomethylation for enhanced tumor suppression and circumvented toxicity in oral squamous cell carcinoma”。本<span style="color: black;">科研</span><span style="color: black;">显示</span>,DNMT1<span style="color: black;">能够</span><span style="color: black;">做为</span>多种信号的<span style="color: black;">重要</span>守门人,<span style="color: black;">因此呢</span>它可能是<span style="color: black;">掌控</span>口腔肿瘤转化和改善OSCC治疗的有<span style="color: black;">潜能</span>的靶点。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="//q2.itc.cn/images01/20240522/d3cb8b414b0a4a59aad0b3c35d9cf5d8.png" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">科研</span>背景</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">口腔鳞状细胞癌(OSCC)是一种起源于口腔上皮细胞的异质性恶性肿瘤,是典型的多<span style="color: black;">周期</span>癌变过程的<span style="color: black;">表率</span>,<span style="color: black;">包含</span>上皮增生、不典型增生和原位癌。<span style="color: black;">因为</span>其在治疗后容易复发和转移,OSCC<span style="color: black;">病人</span>,尤其是晚期<span style="color: black;">病人</span>,<span style="color: black;">存活</span>率较低。为了<span style="color: black;">加强</span>OSCC<span style="color: black;">病人</span>的<span style="color: black;">存活</span>率,人们<span style="color: black;">研发</span>了新的治疗<span style="color: black;">办法</span>,<span style="color: black;">经过</span><span style="color: black;">选取</span>性靶向癌细胞中<span style="color: black;">反常</span>信号分子或蛋白质(如EGFR和PD-L1)来延长OSCC<span style="color: black;">病人</span>的<span style="color: black;">存活</span>时间。然而,这些靶向疗法的疗效<span style="color: black;">常常</span>受到癌细胞产生耐药性的阻碍,这归因于<span style="color: black;">包含</span>基因组不稳定、信号通路<span style="color: black;">错乱</span>或<span style="color: black;">药品</span>毒性在内的多种<span style="color: black;">原因</span>。<span style="color: black;">因此呢</span>,全面<span style="color: black;">认识</span>调控上皮癌<span style="color: black;">出现</span>和肿瘤生长的机制,以识别潜在的OSCC预防和治疗靶点,<span style="color: black;">针对</span>改善OSCC<span style="color: black;">病人</span>的<span style="color: black;">存活</span>率至关<span style="color: black;">要紧</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">科研</span><span style="color: black;">发展</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">为了<span style="color: black;">评定</span>DNMT1在口腔鳞状细胞癌(OSCC)<span style="color: black;">出现</span>过程中的表达<span style="color: black;">状况</span>,<span style="color: black;">科研</span>人员对从口腔正常组织到增生和不典型病变,终到OSCC组织的人类样本进行了分析。结果<span style="color: black;">表示</span>,随着口腔肿瘤转化过程的<span style="color: black;">发展</span>,DNMT1的表达<span style="color: black;">逐步</span><span style="color: black;">增多</span>,并在OSCC组织中达到峰值。一系列OSCC细胞系被用于<span style="color: black;">科研</span>,并初步证实其DNMT1表达<span style="color: black;">明显</span>高于NOK细胞。随后,<span style="color: black;">选择</span><span style="color: black;">表率</span>性的Cal27和FaDu细胞,<span style="color: black;">经过</span>构建DNMT1-敲除细胞系(sh-DNMT1-1和sh-DNMT1-2)进一步验证了这一结果。<span style="color: black;">因为</span>sh-DNMT1-1的基因沉默效果更为<span style="color: black;">明显</span>,<span style="color: black;">因此呢</span>被选为后续<span style="color: black;">科研</span>的对象。DNMT1沉默<span style="color: black;">引起</span>细胞增殖<span style="color: black;">明显</span>减少,表现为<span style="color: black;">身体</span>外OSCC细胞中BrdU和Ki67表达降低,以及形成球形的能力降低。<span style="color: black;">另外</span>,还构建了OSCC异种移植小鼠模型。sh-DNMT1转染的癌细胞表现出<span style="color: black;">明显</span>降低的肿瘤形成能力,表现为肿瘤生长减慢、细胞增殖减少和细胞凋亡<span style="color: black;">增多</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">科研</span>结果<span style="color: black;">显示</span>,DNMT1过表达参与了口腔恶性病变的<span style="color: black;">出现</span>,并促进了癌细胞的恶性<span style="color: black;">行径</span>,<span style="color: black;">引起</span>OSCC肿瘤的生长。为了进一步验证DNMT1在靶向OSCC方面的<span style="color: black;">潜能</span>,<span style="color: black;">科研</span>人员<span style="color: black;">选取</span>了两种已<span style="color: black;">创立</span>的DNMT1<span style="color: black;">控制</span>剂GSK-3484862和GSK-3685032进行平行实验,以确定DNMT1<span style="color: black;">控制</span>在OSCC细胞的生物学<span style="color: black;">行径</span>中的<span style="color: black;">功效</span>,<span style="color: black;">重点</span><span style="color: black;">包含</span>增殖和凋亡。经过<span style="color: black;">1星期</span>的<span style="color: black;">连续</span><span style="color: black;">干涉</span>后,两种<span style="color: black;">控制</span>剂在OSCC细胞中均<span style="color: black;">明显</span>降低了DNMT1的表达。在<span style="color: black;">区别</span>浓度下,两种<span style="color: black;">控制</span>剂均降低了OSCC细胞的增殖标记物Ki67的表达,并<span style="color: black;">增多</span>了凋亡标记物cleaved caspase 3 (CC3)的表达,与DNMT1沉默的效果一致。功能上,这两种<span style="color: black;">控制</span>剂有效<span style="color: black;">控制</span>了OSCC细胞的自我更新能力。这些结果进一步加强了DNMT1是<span style="color: black;">控制</span>OSCC细胞恶性<span style="color: black;">行径</span>的有<span style="color: black;">潜能</span>的靶点这一观点。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="//q3.itc.cn/images01/20240522/e22a5eb6353a47af9a7d7fcc3bf9714e.png" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">DNMT1<span style="color: black;">控制</span>剂在<span style="color: black;">连续</span><span style="color: black;">明显</span>地<span style="color: black;">控制</span>OSCC细胞的增殖和促进其凋亡方面表现出一致性</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">科研</span>结论</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">总之,本<span style="color: black;">科研</span><span style="color: black;">供给</span>了全面的数据,证明精确靶向DNMT1<span style="color: black;">能够</span>破坏<span style="color: black;">全世界</span>DNA甲基化,从而<span style="color: black;">作为</span>促进抗癌疗效、<span style="color: black;">同期</span>较小化由靶向治疗中信号交叉<span style="color: black;">功效</span><span style="color: black;">导致</span>的潜在毒性的<span style="color: black;">要紧</span>途径。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">本文链接:https://www.360worldcare.com/medical.article-4969-11.html<a style="color: black;"><span style="color: black;">返回</span></a><span style="color: black;">外链论坛:http://www.fok120.com/</span>,查看<span style="color: black;">更加多</span></p>

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