2012年8月14日 電 /生物谷BIOON/ --近日,來自弗萊堡大學生物信號研究中心Hassan Jumaa教授領(lǐng)導的實驗團隊發(fā)現(xiàn)了一種促使免疫細胞轉(zhuǎn)變?yōu)閻盒园┘毎姆肿訖C制,。慢性淋巴細胞性白血?。–hronic Lymphocytic Leukaemia,CLL)是西方國家常見的一種血癌,,患者機體細胞攜帶著致病轉(zhuǎn)化的關(guān)鍵因子,,國際著名雜志Nature刊登了研究者的研究成果,理解這些潛在的機制對于開發(fā)出減少疾病效應的新型療法非常重要,。
健康人體內(nèi)含有許多成為B淋巴細胞的白細胞亞族,,這些細胞主要負責產(chǎn)生對付感染的抗體,B淋巴細胞特殊的受體分子可以利用“遙控車車鎖”的法則來檢測致病因子,,最終開始產(chǎn)生抗體,。在CLL病人中,這些受體的異常形式可以導致惡性B淋巴細胞的無限制增殖,,最終免疫系統(tǒng)的健康細胞就會被抑制,。
到目前為止,研究者們假設(shè)由病人機體產(chǎn)生的因子可以??吭谶@種受體附近,,然后激活CLL病人的淋巴細胞,研究者Jumaa說,,在我們的研究中,,我們解釋了B淋巴細胞受體的特殊組分,其負責CLL的產(chǎn)生和發(fā)展,。在CLL病人的B淋巴細胞中,,受體組分FR2和HCDR3以某種特定形式產(chǎn)生,隨后附近相同細胞的受體便會激活彼此來引發(fā)信號的級聯(lián)效應,,最終會促使癌細胞的無限分裂,。
當前,以非特異性方式抑制疾病癥狀的化療方法應用于CLL的治療中,,如今基于解碼CLL的基本分子機制,,研究者開始著力于將他們理解的分子機制應用于該疾病的治療中,研究者表示,,在病人體內(nèi)控制多拷貝的FR2因子成為了可能,,其隨后將靠近受體然后抑制附近受體互相結(jié)合,這最終將降低級聯(lián)信號,,抑制癌癥的發(fā)生,。(生物谷Bioon.com)
編譯自:Researchers uncover how pathological cells activate themselves in chronic lymphocytic leukaemia
doi:10.1038/nature11309
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PMID:
Chronic lymphocytic leukaemia is driven by antigen-independent cell-autonomous signalling
Marcus Dühren-von Minden, Rudolf Übelhart, Dunja Schneider, Thomas Wossning, Martina P. Bach, Maike Buchner, Daniel Hofmann, Elena Surova, Marie Follo, Fabian Köhler, Hedda Wardemann, Katja Zirlik, Hendrik Veelken & Hassan Jumaa
B-cell antigen receptor (BCR) expression is an important feature of chronic lymphocytic leukaemia (CLL), one of the most prevalent B-cell neoplasias in Western countries1. The presence of stereotyped and quasi-identical BCRs in different CLL patients suggests that recognition of specific antigens might drive CLL pathogenesis. Here we show that, in contrast to other B-cell neoplasias, CLL-derived BCRs induce antigen-independent cell-autonomous signalling, which is dependent on the heavy-chain complementarity-determining region (HCDR3) and an internal epitope of the BCR. Indeed, transferring the HCDR3 of a CLL-derived BCR provides autonomous signalling capacity to a non-autonomously active BCR, whereas mutations in the internal epitope abolish this capacity. Because BCR expression was required for the binding of secreted CLL-derived BCRs to target cells, and mutations in the internal epitope reduced this binding, our results indicate a new model for CLL pathogenesis, with cell-autonomous antigen-independent signalling as a crucial pathogenic mechanism.