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Cytotoxic T cells in teleost fish
Teruyuki Nakanishi1, Hideaki Toda, Yasuhiro Shibasaki
1Department of Veterinary Medicine, Nihon University, Fujisawa, Kanagawa 252-0880, Japan. tnakanis@brs.nihon-u.ac.jp
Developmental and Comparative Immunology
|May 3, 2011
Summary
Fish possess antigen-specific cytotoxic T cells, crucial for adaptive immunity. Recent studies reveal CD8(+) cytotoxic T lymphocytes (CTL) in fish, similar to mammals, enabling investigation into cell-mediated immunity.
Area of Science:
- Immunology
- Comparative immunology
- Fish immunology
Background:
- Antigen-specific cytotoxic T cells have been observed in fish through various studies.
- Evidence includes acute allograft rejection, graft-versus-host reactions, and demonstrated alloantigen- and virus-specific cytotoxicity in species like ginbuna and rainbow trout.
- Alloantigen-specific cytotoxic T lymphocyte (CTL) clones have been generated from channel catfish peripheral blood leukocytes.
Purpose of the Study:
- To review recent advancements in understanding fish cytotoxic T cells.
- To highlight the presence and characteristics of CD8(+) CTLs in fish.
- To discuss the implications of genomic data and new antibodies for studying fish cell-mediated immunity.
Main Methods:
- Review of existing in vivo, in vitro, and ex vivo studies on fish cytotoxic T cells.
- Analysis of accumulating fish genome databases and expressed sequence tag (EST) data.
- Utilization of newly produced monoclonal antibodies against CD8α and CD4 antigens in fish.
Main Results:
- Findings suggest the presence of CD8(+) CTLs in fish, analogous to higher vertebrates.
- mRNA expression of T cell receptor (TCR) α/β/γ and CD8α genes has been reported in effector cells of species like ginbuna, rainbow trout, and channel catfish.
- Development of monoclonal antibodies facilitates the study of CTL characteristics and cell-mediated immune mechanisms in defined T cell subsets.
Conclusions:
- Fish exhibit functional similarities to higher vertebrates regarding cytotoxic T cell responses.
- Genomic resources and immunological tools are advancing the study of fish adaptive immunity.
- Further research is needed to fully identify and characterize T cell subsets in various fish species.
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