Cho B K, Lian K C, Lee P, Brunmark A, McKinley C, Chen J, Kranz D M, Eisen H N
Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Proc Natl Acad Sci U S A. 2001 Feb 13;98(4):1723-7. doi: 10.1073/pnas.98.4.1723.
CD8(+) and CD8(-) T cell lines expressing the same antigen-specific receptor [the 2C T cell receptor (TCR)] were compared for ability to bind soluble peptide-MHC and to lyse target cells. The 2C TCR on CD8(-) cells bound a syngeneic MHC (K(b+))-peptide complex 10-100 times less well than the same TCR on CD8(+) cells, and the CD8(-) 2C cells lysed target cells presenting this complex very poorly. Surprisingly, however, the CD8(-) cells differed little from CD8(+) cells in ability to bind an allogeneic MHC (L(d+))-peptide complex and to lyse target cells presenting this complex. The CD8(+)/CD8(-) difference provided an opportunity to estimate how long TCR engagements with peptide-MHC have to persist to initiate the cytolytic T cell response.
对表达相同抗原特异性受体[2C T细胞受体(TCR)]的CD8(+)和CD8(-) T细胞系进行了比较,以研究它们结合可溶性肽-MHC以及裂解靶细胞的能力。CD8(-)细胞上的2C TCR与同基因MHC(K(b+))-肽复合物的结合能力比CD8(+)细胞上相同的TCR低10至100倍,并且CD8(-) 2C细胞对呈递这种复合物的靶细胞的裂解能力非常差。然而,令人惊讶的是,CD8(-)细胞在结合异基因MHC(L(d+))-肽复合物以及裂解呈递这种复合物的靶细胞的能力方面与CD8(+)细胞几乎没有差异。CD8(+)/CD8(-)的差异为估计TCR与肽-MHC的结合需要持续多长时间才能启动细胞毒性T细胞反应提供了一个机会。