4月18日,,日本京都大學的研究小組發(fā)布報告說,,他們利用小鼠試驗,發(fā)現(xiàn)了經(jīng)放射治療后癌細胞轉移的機制,,并可通過遏制這類細胞的轉移,,防止癌癥的復發(fā),有望開發(fā)出新的癌癥療法,。相關論文刊登在英國《自然—通訊》(Nature Communications)上,。
放射治療是與手術,、化療并列的癌癥三大治療手段之一,這一療法利用各種不同能量的射線照射腫瘤,,以抑制和殺滅癌細胞,。放療可單獨使用,也可與手術,、化療等配合使用,。
研究人員將人體的癌細胞移植到小鼠體內(nèi),然后用放射線照射,,結果發(fā)現(xiàn),,一種“HIF-1陰性低氧癌細胞”在放療翌日,就開始向血管轉移,。
研究小組解釋說,,放療后,“HIF-1陰性低氧癌細胞”內(nèi)的“HIF-1”基因被激活,,導致轉移的發(fā)生,。研究小組認為,由于“HIF-1陰性低氧癌細胞”的分裂周期與其他癌細胞不同,,所以放療難以對其發(fā)揮作用,。
研究小組還發(fā)現(xiàn),如果利用相關藥物阻止“HIF-1陰性低氧癌細胞”轉移,,就能有效防止放療后的癌癥復發(fā),。
領導這個研究小組的京都大學講師原田浩說,將來可通過集中對“HIF-1陰性低氧癌細胞”照射高能量放射線,,達到防止癌癥復發(fā)的目的,。此外,還可開發(fā)出阻止這種細胞轉移或在它轉移前就進行標靶攻擊的治療方法,。(生物谷Bioon.com)
doi:10.1038/ncomms1786
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Cancer cells that survive radiation therapy acquire HIF-1 activity and translocate towards tumour blood vessels
Hiroshi Harada; Masahiro Inoue; Satoshi Itasaka; Kiichi Hirota; Akiyo Morinibu; Kazumi Shinomiya; Lihua Zeng; Guangfei Ou; Yuxi Zhu; Michio Yoshimura; W. Gillies McKenna; Ruth J. Muschel; Masahiro Hiraoka
Tumour recurrence frequently occurs after radiotherapy, but the characteristics, intratumoural localization and post-irradiation behaviour of radioresistant cancer cells remain largely unknown. Here we develop a sophisticated strategy to track the post-irradiation fate of the cells, which exist in perinecrotic regions at the time of radiation. Although the perinecrotic tumour cells are originally hypoxia-inducible factor 1 (HIF-1)-negative, they acquire HIF-1 activity after surviving radiation, which triggers their translocation towards tumour blood vessels. HIF-1 inhibitors suppress the translocation and decrease the incidence of post-irradiation tumour recurrence. For the first time, our data unveil the HIF-1-dependent cellular dynamics during post-irradiation tumour recurrence and provide a rational basis for targeting HIF-1 after radiation therapy.