來自西奈山醫(yī)學(xué)院(Mount Sinai School of Medicine)的研究者發(fā)現(xiàn)了一種細(xì)胞亞群,,其或許具有癌癥干細(xì)胞的特性,,而且可以對于化學(xué)療法產(chǎn)生抵抗力,進(jìn)而參與到腫瘤發(fā)育的過程中去,。(Credit: © Jezper / Fotolia)
2012年9月11日 訊 /生物谷BIOON/ --近日,,來自西奈山醫(yī)學(xué)院(Mount Sinai School of Medicine)的研究者發(fā)現(xiàn)了一種細(xì)胞亞群,其或許具有癌癥干細(xì)胞的特性,,而且可以對于化學(xué)療法產(chǎn)生抵抗力,,進(jìn)而參與到腫瘤發(fā)育的過程中去。這項(xiàng)研究或許為我們開發(fā)出早期癌癥的診斷檢測方法提供幫助,,相關(guān)研究成果刊登在了Cancer Cell雜志上,。
化療耐藥性是一種發(fā)生于癌癥病人治療期間的常見而且破壞損傷性極大的一種現(xiàn)象。很不幸的是,,腫瘤細(xì)胞開始確實(shí)會(huì)對化療產(chǎn)生反應(yīng),,可是最終就會(huì)變得具有耐藥性,隨后癌癥細(xì)胞會(huì)繼續(xù)發(fā)生,,直至患者死亡,。這項(xiàng)新型研究揭示了新發(fā)現(xiàn)的癌癥干細(xì)胞并不能夠分化為特異性的細(xì)胞類型,盡管其暴露于化學(xué)療法中,,但其仍可以進(jìn)行增殖,。
研究者通過對前列腺癌細(xì)胞系增加傳統(tǒng)化療的藥物包括多西紫杉醇的劑量,從而來產(chǎn)生藥物耐受性模型,,通過研究,,他們識別出了一種可以表達(dá)胚胎發(fā)育標(biāo)志物的細(xì)胞亞群。另外,,這些細(xì)胞具有癌癥干細(xì)胞的功能,包括促進(jìn)癌細(xì)胞生長的能力等。下一步,,研究小組會(huì)對人類前列腺癌組織樣品進(jìn)行評估,,并且發(fā)現(xiàn)具有高度轉(zhuǎn)移性腫瘤的病人是否有更多的這種癌癥干細(xì)胞。
這是研究者首次以藥物耐受性為基礎(chǔ),,前列腺癌中發(fā)現(xiàn)的“癌癥干細(xì)胞”,,研究中,研究者同時(shí)也開發(fā)了一種針對前列腺癌患者的新療法,,包括標(biāo)準(zhǔn)化療和兩種藥理學(xué)因子的結(jié)合療法,,這將抑制和干細(xì)胞發(fā)育以及細(xì)胞分化相關(guān)的信號路徑,從而中斷腫瘤的發(fā)育,。結(jié)果揭示了化療可以消除分化的腫瘤細(xì)胞,,反之信號路徑抑制子可以有選擇性地剔除癌癥干細(xì)胞亞群。
研究者Domingo-Domenech博士說道,,通過靶位這些新發(fā)現(xiàn)的“癌癥干細(xì)胞”,,我們可以攻擊其生長的巢穴,而不是單單針對病人癥狀來進(jìn)行表面上的治療,。這項(xiàng)研究發(fā)現(xiàn)可以為我們對早期癌癥診斷帶來很大幫助,。(生物谷Bioon.com)
編譯自:Chemotherapy-Resistant Cancer Stem Cell Could Be 'Achilles' Heel' of Cancer
doi:10.1016/j.ccr.2012.07.016
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Suppression of Acquired Docetaxel Resistance in Prostate Cancer through Depletion of Notch- and Hedgehog-Dependent Tumor-Initiating Cells
Josep Domingo-Domenech, Samuel J. Vidal, Veronica Rodriguez-Bravo, Mireia Castillo-Martin, S. Aidan Quinn, Ruth Rodriguez-Barrueco, Dennis M. Bonal, Elizabeth Charytonowicz, Nataliya Gladoun, Janis de la Iglesia-Vicente, Daniel P. Petrylak, Mitchell C. Benson, Jose M. Silva, Carlos Cordon-Cardo
Acquired resistance to Docetaxel precedes fatality in hormone-refractory prostate cancer (HRPC). However, strategies that target Docetaxel resistant cells remain elusive. Using in vitro and in vivo models, we identified a subpopulation of cells that survive Docetaxel exposure. This subpopulation lacks differentiation markers and HLA class I (HLAI) antigens, while overexpressing the Notch and Hedgehog signaling pathways. These cells were found in prostate cancer tissues and were related to tumor aggressiveness and poor patient prognosis. Notably, targeting Notch and Hedgehog signaling depleted this population through inhibition of the survival molecules AKT and Bcl-2, suggesting a therapeutic strategy for abrogating Docetaxel resistance in HRPC. Finally, these cells exhibited potent tumor-initiating capacity, establishing a link between chemotherapy resistance and tumor progression.