近日,國際知名雜誌《Human Gene Therapy》上發表在線了中國科學院深圳先進技術研究院陳志英研究團隊題為「Treatment of human B-cell lymphomas using minicircle DNA vector expressing anti-CD3/CD20 in a mouse model」的研究文章。論文報導該團隊的核心技術非病毒基因
載體微環DNA表達雙靶向抗體治療人B細胞淋巴瘤。
近年來,癌症免疫治療有重大突破,若干治療技術使部分病人病情長期穩定甚至痊癒,表明免疫治療是人類攻克癌症的希望所在。微環DNA表達雙靶向抗體的癌症免疫治療技術成為繼CAR-T技術(「嵌合抗原受體T細胞免疫療法」)、TIL技術(「
腫瘤滲潤淋巴細胞技術)、免疫檢查點抑制劑等技術之後又一項獲得成功的新一代治療技術。
陳志英團隊多年來致力於研究微環DNA表達雙靶向抗體的癌症免疫治療技術。微環DNA是陳志英團隊發明的一種非病毒基因
載體,因其卓越的基因表達功能,方便的製備技術,已被全球生物醫學界廣為應用,並在全世界銷售。雙靶向抗體是一種成熟的抗癌技術,通過連結病人體內的T細胞和癌細胞,達到殺滅癌細胞的目的,其應用比CAR-T和TIL技術方便,
FDA已經批准兩種雙靶向抗體進入市場。但提純的雙靶向抗體半衰期短,需要用微泵連續給藥,非常不便,費用高昂。
最近,陳志英團隊取得相關進展,是用帶有螢火蟲螢光基因的人B細胞淋巴瘤
細胞株Raji接種到免疫缺陷小鼠,然後將微環DNA(MC.CD20)一次注射到小鼠肝臟,在體內持續表達治療水平的抗B細胞淋巴瘤(抗-CD3/CD20)的雙靶向抗體,並提供人的T細胞。因為Raji細胞在小鼠發出的螢光與癌細胞成正比,用小動物成像儀可以實時監測療效(如圖)。結果標明,同時接受MC.CD20與人T細胞的治療組小鼠瘤負荷顯著低於對照組,生命顯著延長,證明抗癌微環DNA治療癌症的可行性。目前,陳志英團隊正在開發把微環DNA注射到肌肉表達抗癌雙靶向抗體的技術,一旦成功,便可實現「治療癌症如打疫苗」一樣安全、方便、可負擔。微環DNA在肌肉表達抗癌雙靶向抗體技術可能為人類攻克癌症做出重要貢獻。
載體技術治療B細胞淋巴瘤研究進展">
B細胞淋巴瘤Raji細胞攜帶螢光基因,圖中治療組(T Cells+MC.CD20)小鼠螢光強度顯著少於對照組(Raji only和T cells),表明微環DNA表達抗-CD3/CD20抗體大大降低瘤負荷,有顯著療效
原文連結:
Treatment of human B-cell lymphomas using minicircle DNA vector expressing anti-CD3/CD20 in a mouse model.Human Gene Therapy
原文摘要:
Bispecific antibodies (BsAbs), capable of directing T cells to kill specific cancer cells by transiently binding the two cell types, have emerged as one class of promising cancer immunotherapies. However, their wide clinical
application might be hampered by two deficiencies: high cost and inconvenience in drug administration. This study presents concept-proving data that these problems could be bypassed by using an enhanced nonviral DNA vector minicircle (MC) to produce BsAb in vivo. It was found that the anti-CD3/CD20 produced from the minicircle (MC.CD20) could effectively mediate the T-cell killing of multiple CD20-positive human B-cell lymphoma cell lines in vitro. More importantly, it was demonstrated that delivery of 5?μg of MC.CD20 to mouse liver via hydrodynamic injection resulted in both the expression of a therapeutic level of anti-CD3/CD20 throughout the 32-day experiment and effective anticancer activity in a B-cell lymphoma xenograft mouse model. The data suggest that MC encoding the BsAbs may become an attractive cancer immunotherapy modality based on its excellent features of safety, efficacy, and convenience in both preparation and use, and its affordability once the delivery technology matures.
相關會議推薦
2017」腫瘤免疫+」研討會
會議時間:2017.3.10 -3.11 會議地點:上海
會議詳情: http://www.bioon.com/z/2017tumor/