來自上海交通大學(xué)上海瑞金醫(yī)院外科胃癌研究組的研究人員發(fā)表了題為“IRX1 influences peritoneal spreading and metastasis via inhibiting BDKRB2-dependent neovascularization on gastric cancer”的文章,,通過大量的體外研究與動(dòng)物實(shí)驗(yàn),,解析了IRX1基因抑癌基因的新作用機(jī)制,。這一研究成果公布在癌癥研究領(lǐng)域權(quán)威刊物《致癌基因》(Oncogene)上,。
文章的第一作者是上海瑞金醫(yī)院外科胃癌研究組碩士研究生蔣金玲,,其指導(dǎo)老師是上海瑞金醫(yī)院于穎彥,、朱正綱和劉炳亞等,,其中于穎彥教授早年畢業(yè)于河北醫(yī)科大學(xué),2001年7月調(diào)入瑞金醫(yī)院,,擔(dān)任上海消化外科研究所病理研究室主任,,從事消化系統(tǒng)的腫瘤病理學(xué)以及器官移植病理學(xué)研究。
胃癌在我國(guó)發(fā)病率居各類腫瘤之首,。在衛(wèi)生部組織的1990至1992年全國(guó)第二次死因調(diào)查中,,我國(guó)胃癌的死亡率占到所有因癌癥死亡人數(shù)的23.2%。據(jù)北京腫瘤研究所統(tǒng)計(jì),,北京市的胃癌發(fā)病率為18.995/10萬(wàn),,而且呈現(xiàn)出居高不下的態(tài)勢(shì)。
在這篇文章中,,研究人員獲得了胃癌的一種抑癌基因作用新機(jī)制,,他們通過大量的體外研究與動(dòng)物實(shí)驗(yàn)發(fā)現(xiàn),向有IRX1基因缺陷的胃癌細(xì)胞轉(zhuǎn)導(dǎo)該抑癌基因后,,胃癌細(xì)胞在動(dòng)物腹腔內(nèi)擴(kuò)散和向肺內(nèi)的轉(zhuǎn)移的能力明顯受到遏制,。通過對(duì)腫瘤內(nèi)的微血管密度及血管擬態(tài)密度分析發(fā)現(xiàn),轉(zhuǎn)染有IRX1抑癌基因的腫瘤生長(zhǎng)與侵襲能力受到抑制是與其腫瘤內(nèi)微血管密度的減少有關(guān),。研究人員利用染色質(zhì)免疫共沉淀等分析最終鑒定出,,IRX1基因誘導(dǎo)腫瘤內(nèi)新生血管及血管擬態(tài)減少的關(guān)鍵在于抑制了其下游靶基因緩激肽受體B2(BDKRB2)的表達(dá),與傳統(tǒng)的VEGF通道無關(guān),。利用小干擾RNA技術(shù)敲低BDKRB2或是其下游通道中的信號(hào)傳導(dǎo)分子,,均可以實(shí)現(xiàn)對(duì)體外血管形成的抑制作用,表明BDKRB2通路具有潛在的靶向腫瘤血管治療價(jià)值,。
這項(xiàng)研究是在國(guó)家自然科學(xué)基金,、科技部“863”重大項(xiàng)目以及上海市科委的資助下完成的。據(jù)于穎彥教授介紹,,此項(xiàng)研究對(duì)揭示腫瘤復(fù)雜的血管生成調(diào)控機(jī)制提供了又一重要線索,。(生物谷Bioon.com)
專題:MicroRNA 和 癌癥
生物谷推薦原文出處:
Oncogene DOI:10.1038/onc.2011.154
IRX1 influences peritoneal spreading and metastasis via inhibiting BDKRB2-dependent neovascularization on gastric cancer
J Jiang, W Liu, X Guo, R Zhang, Q Zhi, J Ji, J Zhang, X Chen, J Li, J Zhang, Q Gu, B Liu, Z Zhu, Y Yu
The overexpression of IRX1 gene correlates with the growth arrest in gastric cancer. Furthermore, overexpression of IRX1 gene suppresses peritoneal spreading and long distance metastasis. To explore the precise mechanisms, we investigated whether restoring IRX1 expression affects the angiogenesis or vasculogenic mimicry (VM). Human umbilical vein endothelial cells (HUVECs) and chick embryo and SGC-7901 gastric cancer cells were used for angiogenesis and VM analysis. Small interfering RNA was used for analyzing the function of BDKRB2, a downstream target gene of IRX1. As results, the remarkable suppression on peritoneal spreading and pulmonary metastasis of SGC-7901 cells by IRX1 transfectant correlates to reduced angiogenesis as well as VM formation. Using the supernatant from SGC-7901/IRX1 cells, we found a strong inhibiting effect on angiogenesis both in vitro and in chick embryo. SGC-7901/IRX1 cells revealed strong inhibiting effect on VM formation too. By gene-specific RNA interference for BDKRB2, or its effector PAK1, we got an effective inhibition on tube formation, cell proliferation, cell migration and invasion in vitro. In conclusion, enforcing IRX1 expression effectively suppresses peritoneal spreading and pulmonary metastasis via anti-angiogenesis and anti-VM mechanisms, in addition to previously found cell growth and invasion. BDKRB2 and its downstream effector might be potential targets for anti-cancer strategy.