近日,,一項(xiàng)新的研究發(fā)現(xiàn)胰腺癌細(xì)胞運(yùn)用一種策略削弱免疫系統(tǒng),,使他腫瘤細(xì)胞自身能夠逃脫免疫細(xì)胞的破壞。
這項(xiàng)研究由國家衛(wèi)生研究院以及歐文頓研究所癌癥研究所博士后獎學(xué)金計(jì)劃等資助,并發(fā)表在Cancer Cell雜志上,。
胰腺癌以其侵略性惡名昭彰,。在過去五年中,只有4%的患者生存下來,,目前可用的治療胰腺癌的手段基本是無效的,。
Dafna Bar-Sagi博士說:這是非常重要的,我們應(yīng)了解如何中斷這種疾病的進(jìn)展,,努力調(diào)控胰腺癌的發(fā)展,。
使用胰腺癌小鼠模型,Bar-Sagi博士和他的同事發(fā)現(xiàn),,目前95%的胰腺癌有KRAS基因突變,,進(jìn)而引發(fā)一種叫做GM-CSF的蛋白質(zhì)表達(dá)。腫瘤源性GM-CSF的驅(qū)使髓源性抑制細(xì)胞積聚在腫瘤周圍地區(qū),,這些細(xì)胞抑制人體的自然免疫,,加強(qiáng)腫瘤細(xì)胞的防御功能。這樣,,胰腺癌細(xì)胞就能逃脫被人體的免疫系統(tǒng),,持續(xù)生長和分裂。
通過阻斷胰腺癌細(xì)胞GM-CSF的產(chǎn)生,,研究人員發(fā)現(xiàn)能夠破壞髓源性抑制細(xì)胞,,恢復(fù)能殺死腫瘤細(xì)胞的免疫反應(yīng)功能。該研究再次證明利用免疫系統(tǒng)來抗腫瘤是一種很有效的治療策略,。
Bar-Sagi補(bǔ)充說:目前,,人類胰腺癌樣本中絕大多數(shù)都表達(dá)GM-CSF蛋白,我們希望這一研究發(fā)現(xiàn)將最終帶來新的藥物治療,,能阻止GM-CSF蛋白的生成或其功能,,使抗腫瘤免疫細(xì)胞攻擊癌細(xì)胞阻止腫瘤的發(fā)展。
這項(xiàng)研究的合著者包括第一作者Yuliya Pylayeva-Gupta博士,、Kyoung Eun Lee博士和紐約大學(xué)醫(yī)學(xué)院的Cristina H. Hajdu醫(yī)師,、George Miller醫(yī)學(xué)博士。(生物谷:Bioon.com)
doi:10.1016/j.ccr.2012.04.024
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PMID:
Oncogenic Kras-Induced GM-CSF Production Promotes the Development of Pancreatic Neoplasia.
Yuliya Pylayeva-Gupta, Kyoung Eun Lee, Cristina H. Hajdu, George Miller, Dafna Bar-Sagi.
Stromal responses elicited by early stage neoplastic lesions can promote tumor growth. However, the molecular mechanisms that underlie the early recruitment of stromal cells to sites of neoplasia remain poorly understood. Here, we demonstrate an oncogenic KrasG12D-dependent upregulation of GM-CSF in mouse pancreatic ductal epithelial cells (PDECs). An enhanced GM-CSF production is also observed in human PanIN lesions. KrasG12D-dependent production of GM-CSF in vivo is required for the recruitment of Gr1+CD11b+ myeloid cells. The suppression of GM-CSF production inhibits the in vivo growth of KrasG12D-PDECs, and, consistent with the role of GM-CSF in Gr1+CD11b+ mobilization, this effect is mediated by CD8+ T cells. These results identify a pathway that links oncogenic activation to the evasion of antitumor immunity.