據(jù)《印度時報》報道,,近日新加坡一醫(yī)學研究小組在“清潔”人體胚胎干細胞技術上獲得重大突破,,該小組研究人員稱,,他們發(fā)現(xiàn)了一種可以起到“清潔”人體胚胎干細胞的技術,,如若該技術能最終應用在臨床上,,那么這將為抵抗癌癥,、修復受損人體組織起到相當重要的作用,。
新加坡研究人員介紹說,人體胚胎干細胞能夠生長分化成為各種器官及組織,,并最終形成整個人體,。但是,有研究表明,,未能分化的殘余干細胞最終可能形成致癌細胞,,從而帶來危害。最近在《干細胞雜志》(stem cells)上,,發(fā)表了他們的最新研究成果,,該研究小組稱,他們培育出了具有一些特殊抗體的細胞組織,,利用這些抗體,,他們成功的殺死了實驗小鼠身上的殘余的干細胞(即可發(fā)生癌變的細胞)。該團隊的研究人員周(Andre Choo)稱:“人體自身許多的胚胎干細胞具有相當強的分化能力,比如說心臟細胞,,同時這些細胞中的殘留細胞可能會形成癌細胞,。”他同時還舉例說:“假設我們培養(yǎng)出來了一個組織或者是器官,該組織95%以上的細胞都是已經(jīng)分化了的細胞,,但是還剩下5%的殘留干細胞,,那么這將帶來一系列的問題(癌變)。”而根據(jù)該研究團隊的最新成果,,成功利用這種特殊抗體來殺死這些殘留干細胞將大大降低癌變的風險,。該團隊成功的將預先在老鼠體內(nèi)產(chǎn)生的抗體添加到培育好的胚胎干細胞中,結果發(fā)現(xiàn),,在短短的30分鐘時間內(nèi),,未分化的殘留干細胞全部被殺死,而已經(jīng)分化完畢的主要細胞卻毫發(fā)無損,。
隨后,,研究人員又利用該抗體,在一組老鼠的體內(nèi)進行了實驗,,同時對另一組老鼠只注射沒經(jīng)過處理的胚胎干細胞,,結果發(fā)現(xiàn),注射過該特殊抗體的一組老鼠在20周的時間內(nèi)均未發(fā)現(xiàn)有癌細胞的出現(xiàn),,而在另一組老鼠體內(nèi)則檢測到了癌細胞,。由此,科學家認為,,他們所培育的抗體起到了清除殘留干細胞或者是“癌”細胞的作用,,這一技術的發(fā)現(xiàn)無疑會帶來一個巨大的進步,如果這項技術能最終應用在臨床上,,那么抵抗癌癥將不再是困擾人類的難題,。
生物谷推薦原始出處:
stem cell First published online March 20, 2008
Selection Against Undifferentiated Human Embryonic Stem Cells by a Cytotoxic Antibody Recognizing Podocalyxin-like Protein-1
Andre B. Choo 1*, Heng Liang Tan 1, Sheu Ngo Ang 1, Wey Jia Fong 1, Angela Chin 1, Jennifer Lo 1, Lu Zheng 1, Hannes Hentze 2, Robin J Philp 1, Steve K. W. Oh 1, Miranda Yap 1
1 Bioprocessing Technology Institute, 20 Biopolis Way, Centros, #06-01, Singapore 138668
2 ES Cell International, 11 Biopolis Way, #05–06 Helios Building, 138667 Singapore, Republic of Singapore
* To whom correspondence should be addressed. E-mail: [email protected] .
abstract
Future therapeutic applications of differentiated human embryonic stem cells (hESC) carry a risk of teratoma formation by contaminating undifferentiated hESC. We generated 10 monoclonal antibodies (mAbs) against surface antigens of undifferentiated hESC, showing strong reactivity against undifferentiated, but not differentiated hESC (embryoid bodies). The mAbs did not cross react with mouse fibroblasts, and showed weak to no reactivity against human embryonal carcinoma cells. Notably, one antibody (mAb 84) is cytotoxic to undifferentiated hESC and NCCIT cells in a concentration-dependent, complement-independent manner. mAb 84 induced cell death of undifferentiated, but not differentiated hESC within 30 min of incubation, and immunoprecipitation of the mAb-antigen complex revealed that the antigen is podocalyxin-like protein-1. Importantly, we observed absence of tumor formation when hESC and NCCIT cells were treated with mAb 84 prior to transplantation into SCID mice. Our data indicate that mAb 84 may be useful in eliminating residual hESC from differentiated cells populations for clinical applications.