FOXM1
FOXM1(Forkhead box protein M1)[1]是一种转录因子蛋白质,有关调节细胞周期的重要作用。当FOXM1从小鼠中去除后,幼鼠在出生后不久因心脏衰竭而死亡,由于心肌细胞和肝细胞多倍体的发展[2]。研究显示了FOXM1对染色体偏析和基因组稳定性有重大作用。FOXM1因子失调表达了会造成异常的细胞增殖,导致引发癌症[3][4][5][6][7][8][9]。
2010年度分子
[编辑]分子细胞生物学及生物技术方案暨研究国际协会(简称为ISMCBBPR)已将FOXM1评为2010年的年度之重要分子。ISMCBBPR之所以选择FOXM1,乃因为看中其在作为癌症治疗靶点上的无限潜力。去年,美国的《癌症研究》(Cancer Research)杂志网站上曾发表了一篇关于英国伦敦玛丽王后大学的研究人员阐述了FOXM1的过度表现如何破坏细胞周期的稳定之文章[10][11][12][13]。从FOXM1的异常上调,进而使细胞陷入基因组的不稳定,随后使得细胞受到如DNA上的损伤,检查点(如p53或p16)被摧毁,以致受损的细胞也能增殖,因而累积了启动癌症所需的遗传突变基因[5][6][7][8][9]。
癌前干细胞的标记
[编辑]在2002年,FOXM1首次被贴上癌蛋白的标签[14]。从此,研究人员将FOXM1的过度表达与肺癌、肝癌、乳腺癌、脑癌及很多其他癌症联系在一起[15][16][17][18][19][20][21][22]。然而,当时的研究人员并不清楚蛋白的过度表达是如何促进癌症的发展,这也阻碍了癌症疗法上的进展与开发。为了更好地了解这过程,伦敦大学伦敦玛丽王后大学临床及诊断口腔科学中心的讲师所领导的研究小组在正常人口腔上皮干细胞中使FOXM1过度表达,进而诱导细胞进入癌变前期细胞增生的阶段[23][24][25][26][27]。通过这个实验,发现FOXM1干扰了干细胞的生长周期及其分裂。正常水平的FOXM1控制了细胞的生长。当细胞定期分裂时,FOXM1也协调了遗传物质分配到两个子细胞中。当FOXM1过度表达时,该蛋白丧失了对细胞生长的控制,使得细胞疯狂生长。因此,FOXM1的表达成为了癌症测试和预防药物开发的重点。但是去除该蛋白的方法并不是一个最理想的选择,因为它是正常器官在发育上为不可或缺之一的蛋白。过去的研究发现,当FOXM1从小鼠中去除后,幼鼠在出生后不久因心脏衰竭而死亡。
临床益处
[编辑]研究人员已经表明了FOXM1基因过度表达会诱发干细胞异常增殖,故引发了癌症病变[23][24][25][26][27]。因此,目前专家认为FOXM1作为癌症生物标志物具有潜力在多种癌症的临床诊断上带来革命性的变化[28]。
目前罹患口腔癌症的患者日益增加。全球口腔癌患者每年超过50万人。根据世界卫生组织的预测在2030年预计将会有100万人罹患口腔癌。吸烟、咀嚼烟草[5]或槟榔、喝酒过量都是口腔癌的致病因素。很多癌症在晚期才会出现症状,晚期治疗后的复发率非常高。如果在早期诊断,90%的癌症都可以治愈。迫切需要的是一种灵敏的诊断方法以提高初期诊断癌症的能力,让口腔癌病人能得以争取最早的发现、方能提高存活率和治愈率。
命名为定量恶性肿瘤指数诊断系统(qMIDS)[29][30][31] 目前已发展为一种实用的,敏感的和定量分子的诊断测试. 这是基于FOXM1在患者口腔,皮肤或外阴病变的初期癌症之检测和预测患癌症的风险上的测试。该测试声称可以检测初期口腔或头部和颈部癌症上的准确率,约高达91-94%[30][31]。再加上适当的治疗(手术)为初期口腔癌的检测奠定了极高的治愈率。此测试可避免后期检测所降低的存活率(晚期发现肿瘤导致小于20%存活率)。这个测试是目前正在积极进行中的临床试验。
许多正在开发的抗肿瘤化合物都以FOXM1为靶点,唯迄今仍未进入临床试验的阶段。且原型药物目前也正在积极研究中。
外部链接
[编辑]- 效仿Twitter的FOXM1最新消息(页面存档备份,存于互联网档案馆)
- FOXM1研究组-Google+(页面存档备份,存于互联网档案馆)
- FOXM1研究组-Queen Mary University of London
参考列表
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