Monoclonal Antibodies to the Equine CD2 T Lymphocyte Marker, to a pan-granulocyte/monocyte Marker and to a Unique pan-B Lymphocyte Marker

Immunobiology. 1994 Dec;192(1-2):48-64. doi: 10.1016/S0171-2985(11)80407-9.


Murine monoclonal antibodies, HB88A, B29A and DH59B separately identify the CD2 T lymphocyte molecule, a unique pan-B lymphocyte surface marker and a pan-granulocyte/monocyte surface molecule, respectively, in the horse. Specificity was shown by two-color immunofluorescent flow cytometry and immunofluorescent microscopy. MAb HB88A reacted with a 52 kDa pan-T lymphocyte molecule present on 75% +/- 7 of peripheral blood lymphocytes (PBL) (n = 15 horses). It also reacted with lymphocytes restricted to T lymphocyte dependent areas of lymph node and spleen. Specificity of mAb HB88A to CD2 was demonstrated by its reactivity to COS7 cells which expressed a transfected 1.5 kb equine lymphocyte c-DNA clone having 77.5% overall sequence homology with human CD2 c-DNA. MAb B29A reacted with a pan-B lymphocyte specific cell surface complex, 143, 72, 50, 40, 27 and 14.5 kDa, present on 19% +/- 7 of PBL (n = 15 horses). This complex has not been described in the horse or other species. MAb DH59B reacted with a 96 kDa pan-granulocyte/monocyte specific surface protein and identified macrophages and Kupffer cells in equine tissue sections. Together these mAbs can be used to identify and quantitate the major constituents of equine leukocytes.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Antibodies, Monoclonal / immunology*
  • Antibody Specificity / immunology
  • Antigens, Surface / immunology*
  • B-Lymphocytes / immunology
  • CD2 Antigens / genetics
  • CD2 Antigens / immunology
  • Cell Line
  • Fluorescent Antibody Technique
  • Granulocytes / immunology
  • Horses
  • Leukocytes / immunology*
  • Lymphoid Tissue / immunology
  • Mice
  • Mice, Inbred BALB C
  • Monocytes / immunology
  • T-Lymphocytes / immunology


  • Antibodies, Monoclonal
  • Antigens, Surface
  • CD2 Antigens