Comparative Studies on the Distribution and Population of Immunocompetent Cells in Bovine Hemal Node, Lymph Node and Spleen

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  • ZHANG Weidong
    Department of Veterinary Anatomy, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
  • NASU Tetsuo
    Department of Veterinary Anatomy, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
  • HOSAKA Yoshinao Z.
    Department of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Tottori 680-8550, Japan
  • YASUDA Masahiro
    Department of Veterinary Anatomy, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan

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The distribution and population of immunocompetent cells in bovine hemal node, mesenteric lymph node and spleen were analyzed comparatively by immunohistochemistry and flow cytometry. Many CD8+ cells, CD172a+ cells and γδ T cells were found in the lymphatic cord along the sinus of the hemal node and the splenic red pulp. A few CD8+ cells and γδ T cells were distributed diffusely in the paracortex and medullary cord of the mesenteric lymph node. Many germinal centers were recognized in the lymphatic regions such as the cortex and white pulp of these lymphoid organs. The populations of CD8+ cells and γδ T cells in the hemal node and the spleen were higher than those of the mesenteric lymph node. In addition, the populations of CD21+ cells and MHC class II+ cells in the hemal node and the mesenteric lymph node were higher than those of the spleen. The results suggest that the hemal node has an important role in both cellular and humoral immunity as well as the lymph node and the spleen in cattle.

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