Conservation of characteristics and functions of CD4 positive lymphocytes in a teleost fish

Hideaki Toda, Yasutaka Saito, Takuhito Koike, Fumio Takizawa, Kyosuke Araki, Takeshi Yabu, Tomonori Somamoto, Hiroaki Suetake, Yuzuru Suzuki, Mitsuru Ototake, Tadaaki Moritomo, Teruyuki Nakanishi

研究成果: ジャーナルへの寄稿学術誌査読

117 被引用数 (Scopus)

抄録

The presence of helper and cytotoxic T cells in fish has been suggested, although T cell subsets have yet to be identified at the cellular level. In order to investigate the functions of CD4 and CD8α positive T cells we attempted to produce and characterize monoclonal antibodies (mAbs) against teleost CD4 and CD8α. Here we report the successful production of mAbs against CD4 and CD8α in clonal ginbuna crucian carp Carassius auratus langsdorfii and the function of CD4 positive T cells. In this study we demonstrate the presence of teleost CD4- and CD8α-positive T cell subsets with morphology, tissue distribution and gene expression similar to those of mammalian CD4- and CD8-positive T lymphocytes. Using mAbs we found that CD4/CD8 double positive T cells are only present in the thymus, suggesting that it is the site of T cell development. We further demonstrated in vitro proliferation of CD4 positive T cells by allogeneic combination of mixed leukocyte culture and antigen-specific proliferation of CD4 positive T cells after in vitro sensitization with OVA. In our previous study we showed that CD8α-positive lymphocytes are the primary cell type showing specific cytotoxicity against allogeneic targets. Collectively, these findings suggest that CD4 and CD8α positive T cells in ginbuna are equivalent to helper and cytotoxic T lymphocytes (CTL) in mammals, respectively. This is the first report to show the characteristics and functions of CD4 positive T cells in fish and these findings shed light into the evolutionary origins and primordial functions of helper T cells.

本文言語英語
ページ(範囲)650-660
ページ数11
ジャーナルDevelopmental and Comparative Immunology
35
6
DOI
出版ステータス出版済み - 6月 2011

!!!All Science Journal Classification (ASJC) codes

  • 免疫学
  • 発生生物学

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