title: Characterization of CD8+ leukocytes in fugu (Takifugu rubripes) with antiserum against fugu CD8alpha.
abstract: We have investigated the characteristics of CD8+ leukocytes by using an anti-CD8alpha antiserum raised in mouse by DNA-immunization. The magnetically sorted CD8alpha+ peripheral blood leukocyte (PBL) population comprised lymphocytes/thrombocytes and monocytes, whereas CD8alpha- PBLs consisted of lymphocytes/thrombocytes, monocytes, and neutrophils. Expression analysis demonstrated that both groups of cells expressed the CD3epsilon and TCRalpha genes. The CD8alpha and CD8beta genes were detected only in CD8alpha+ cells, whereas expression of CD4 and immunoglobulin light chain (IgL) was observed only in CD8alpha- cells. These results suggest that fugu CD8alpha+ leukocytes contain CD8+ T cells, but not CD4+ T cells or B cells. Furthermore, mitogenesis of the CD8+ lymphocyte/thrombocyte population was induced by phytohemaglutinin stimulation, suggesting that fish CD8+ lymphocytes/thrombocytes (probably CD8+ T cells) have characteristics similar to mammalian CD8+ T cells. Neutrophils and monocytes/macrophages infiltrating a subcutaneous inflammatory site expressed only CD8alpha, but not CD8beta, CD4, TCRalpha, or IgL. This result suggests that similar to mammalian dendritic cells, fugu monocytes/macrophages express CD8alpha.
authors.affiliation: Fisheries Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 2971-4 Maisaka, Shizuoka 431-0214, Japan.
authors.forename: Kyosuke
authors.initials: K
authors.lastname: Araki
authors.forename: Kanako
authors.initials: K
authors.lastname: Akatsu
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Suetake
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Yuzuru
authors.initials: Y
authors.lastname: Suzuki
mesh_terms: D000818:Animals; D001792:Blood Platelets / Q000276:immunology; D016827:CD8 Antigens / Q000097:blood* / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism*; D019556:COS Cells; D002462:Cell Membrane / Q000276:immunology / Q000378:metabolism; D002465:Cell Movement; D002469:Cell Separation; D002522:Chlorocebus aethiops; D005260:Female; D051379:Mice; D008938:Mitosis; D023741:Takifugu / Q000097:blood* / Q000276:immunology*
chemical_list: D016827:CD8 Antigens