BRAF基因突变在甲状腺乳头状癌中的应用课件.ppt
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1、李永平Doctor Li,BRAF基因突变在甲状腺乳头状癌中的临床应用,2014-04-23,*,目录 CONTENTS,*,相关文献回顾,1,*,BRAF文献回顾,*,BRAF文献回顾,*,BRAF文献回顾,*,BRAF基因介绍,2,*,PTC中BRAF基因突变的分布,The worldwide prevalence of BRAF mutations in PTC,Endocrine-Related Cancer (2006) 13 455464,文献结论, B-RAFV600E mutation was found in 99 out of 260 PTCs (38%) The B-RA
2、FV600E mutation was present in 48.3% of cases of classic PTC (85 out of 176), in 17.6% (nine out of 51) of follicular variants of PTC, in 21.7% (five out of 23) of other PTC variants and in none of the ten poorly differentiated tumors.The B-RAFV600E was correlated with an older age at diagnosis (P =
3、0.01) Endocrine-Related Cancer (2006) 13 455464,BRAF基因突变的致病机理,The model illustrates the two major signaling pathways, the PI3K/Akt and the MAP kinase pathways。The increasing color intensity of the circle represents the increasing progression and aggressiveness ofthe tumor. MAPK pathway, the RasRafME
4、KMAPERK pathway.,Clin Cancer Res 2007;13:1161-1170.,Peng Hou, Dingxie Liu, Yuan Shan, et al.,BRAF信号通路,Expert Rev. Mol. Diagn. Future Science Group (2012),BRAF蛋白与KRAS蛋白同为 RAS-RAF-MEK-ERK信号通 路中上游调节因子,在 MAPK/ERK信号通路中起着 举足轻重的作用;通过这些途径,将胞外信号转化为胞内信号,从而有效 应对外界的信号刺激,调节细胞的生长、增殖、分化, 抑制细胞的凋亡。,Ad P,RAS,BRAF,MEK
5、,ERK,ERK,Nucleus,Nuclear gene regulation,Figure 1. Molecular signaling of the MAP kinase pathway. RTK dimerizes uponligand (growth factor, cytokine and hormone) binding and acquires ikinasedomain,leading to activation of RAS via a series of Ad Ps. Through cascadephosphorylation events, the activated
6、 RAS recruits BRAF to the cell membrane andactivates it. BRAF then activates downstream MEK, which in turn activates ERK. Theactivated ERK translocates from cytosol into nucleus to regulate gene expression.Ad P: Adaptor protein; RTK: Receptor tyrosine kinase.,Ad P,MAPK通路,Activation of MAPK signaling
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- BRAF 基因突变 甲状腺 乳头状 中的 应用 课件
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