许多病毒的 epitope 在匹配 MHC 的个人的特定的 T 房间受体(TCR ) 被表明了在链包含保存氨基酸主题决定补充的区域 3 (CDR3 ) 。然而,保存主题是否能也在 TCR 链被发现,不肯定。在以前的研究,我们开发了一个修改方法扩大 cytomegalovirus (CMV ) 的百分比 pp65 在由在 vitro 的连续的肽刺激的 PBMC 的肽特定的 CD8+ T 房间,它为察觉提供特定的 T 房间的足够的数字。在这研究,我们进一步分析了 TCR V 和 V 基因家庭的限制用法并且调查了 pp65 的 CDR3 基因顺序肽特定的 CD8+ T 房间。CDR3 spectratypes 的分析建议了 TCR 链 AV8, AV12, AV21, AV31 家庭和 TCR 的一个限制用法链 BV3, BV14, BV21, BV23,在施主 CD8+ T 房间的 BV11 家庭由 pp65 肽刺激了。这些 T 房间的序列包含了类似的顺序(TX ) 在 TCR 链和 L (XT ) 的 CDR3 区域的 G (X) A 在 TCR 的 G (X) A 链。
Many viral epitope specific T cell receptors (TCRs) in MHC-matched individuals have been demonstrated to involve conserved amino acid motifs in β chain complementarity-determining region 3 (CDR3). However, it is not sure whether the conserved motifs can also be found in TCR β chain. In previous studies, we developed a modified method to enlarge the percentage of cytomegalovirus (CMV) pp65 peptide-specific CD8^+ T cells in PBMC by continuous peptide stimulation in vitro, which provides sufficient number of specific T cells for detection. In this study, we further analyzed the restrictive usage of TCR Vα and Vβ gene families and investigated the CDR3 gene sequence of pp65 peptide-specific CD8β T cells. Analysis of CDR3 spectratypes suggested a restricted usage of TCR α chain AV8, AV12, AV21, AV31 families and TCR βchain BV3, BV14, BV21, BV23, BVll families in donor CD8^+ T cells stimulated by pp65 peptide. The sequences of these T cells involved similar sequence (TX) G (X) A in CDR3 region of TCR α chain and L (XT) G (X) A in TCR β chain.