Evidence of the extrathymic development of tyrosinase-related protein-2-recognizing CD8+ T cells with low avidity

Mamoru Harada, Hisakata Yamada, Katsunori Tatsugami, Kikuo Nomoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The majority of the human tumour-associated antigens characterized to date are derived from non-mutated self-proteins. However, nothing is known about the development of autoreactive and tumour-associated antigen-recognizing T cells. Tyrosinase-related protein (TRP)-2 is a non-mutated melanocyte differentiation antigen and TRP-2-recognizing CD8+ T cells are known to show responses to melanoma both in humans and mice. In addition, TRP-2-reactive T cells with low avidity have been suggested to be readily induced from the spleen cells of naïve mice. On the other hand, recent reports suggest that self antigen-reactive CD8+ T cells can be positively selected in the periphery. In this study, we tested the possibility that TRP-2-reactive CD8+ T cells in naïve mice could develop via the extrathymic pathway. As a consequence, TRP-2-reactive CD8+ T cell precursors in naïve C57BL/6 mice were suggested to express both interleukin-2 (IL-2) receptor β chain (IL-2Rβ) and CD44 molecules, in a manner similar to that of extrathymically developed T cells. Furthermore, IL-2Rβ+ CD44+ CD8+ T cells were detected in the adult thymectomized and bone marrow-reconstituted mice, and functional TRP-2-reactive T cells were generated from their spleen cells. Overall, these results suggest that low avidity CD8+ T cells recognizing TRP-2 can be developed extrathymically.

Original languageEnglish
Pages (from-to)67-74
Number of pages8
Issue number1
Publication statusPublished - 2001

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology


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