免疫正電子發射計算機斷層掃描(PET)活體檢測抗原特異CD8+ T細胞
作者:
小柯機器人發布時間:2020/9/17 15:57:55
活體檢測抗原特異CD8+ T細胞的免疫正電子發射計算機斷層掃描(PET),這一成果由波士頓兒童醫院Hidde L. Ploegh研究小組和阿爾伯特愛因斯坦醫學院Steven C. Almo小組合作經過不懈努力而取得。 該項研究成果發表在2020年9月14日出版的《自然—方法學》上。
為此,研究團隊採用synTacs,是二聚的、具有特定組成的主要組織相容的分子骨架。SynTacs用正電子同位素標記後,可以在活體內無創成像抗原特異CD8+ T細胞。使用載有適當肽的放射性標記的synTacs,研究小組通過正電子發射斷層掃描對攜帶人乳頭瘤病毒陽性腫瘤的小鼠中的人乳頭瘤病毒特異的CD8+ T細胞,以及甲型流感病毒感染小鼠肺中的甲型流感病毒特異的CD8+ T細胞進行成像。
研究人員提出該方法有可能在活體內可視化抗原特異性CD8+ T細胞群體,這可能為預後和診斷提供幫助。
據介紹,免疫系統識別主要組織相容性分子上的肽的能力有助於消除癌症和病原體。在活體中跟蹤這些響應可以幫助評估免疫幹預措施的有效性和提高對免疫反應的機理性理解。
附:英文原文
Title: In vivo detection of antigen-specific CD8 + T cells by immuno-positron emission tomography
Author: Andrew W. Woodham, Stad H. Zeigler, Ella L. Zeyang, Stephen C. Kolifrath, Ross W. Cheloha, Mohammad Rashidian, Rodolfo J. Chaparro, Ronald D. Seidel, Scott J. Garforth, Jason L. Dearling, Maia Mesyngier, Phaneendra K. Duddempudi, Alan B. Packard, Steven C. Almo, Hidde L. Ploegh
Issue&Volume: 2020-09-14
Abstract: The immune system’s ability to recognize peptides on major histocompatibility molecules contributes to the eradication of cancers and pathogens. Tracking these responses in vivo could help evaluate the efficacy of immune interventions and improve mechanistic understanding of immune responses. For this purpose, we employ synTacs, which are dimeric major histocompatibility molecule scaffolds of defined composition. SynTacs, when labeled with positron-emitting isotopes, can noninvasively image antigen-specific CD8+ T cells in vivo. Using radiolabeled synTacs loaded with the appropriate peptides, we imaged human papillomavirus-specific CD8+ T cells by positron emission tomography in mice bearing human papillomavirus-positive tumors, as well as influenza A virus–specific CD8+ T cells in the lungs of influenza A virus–infected mice. It is thus possible to visualize antigen-specific CD8+ T-cell populations in vivo, which may serve prognostic and diagnostic roles.
DOI: 10.1038/s41592-020-0934-5
Source: https://www.nature.com/articles/s41592-020-0934-5