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A human macrophage‐associated antigen (CD68) detected by six different monoclonal antibodies
Author(s) -
Micklem Kingsley,
Rigney Elizabeth,
Cordell Jacqueline,
Simmons David,
Stross Paul,
Turley Helen,
Seed Brian,
Mason David
Publication year - 1989
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.1989.tb00210.x
Subject(s) - monoclonal antibody , antigen , immunology , macrophage , cd68 , antibody , monoclonal , medicine , virology , biology , immunohistochemistry , genetics , in vitro
Summary. Antibodies grouped together by the Third Workshop on Leucocyte Differentiation Antigens on the basis of pan‐macrophage reactivity on tissue sections were analysed in immunoprecipitation experiments. Antibodies Y2/131. EBM11, Ki‐M6 and Ki‐M7 all precipitated antigens of M r 110000 which were shown to be identical by preclearing experiments. In addition a recently produced antibody, KP1, which identifies macrophages in paraffin‐embedded tissue, was shown to recognize the same antigen. The antibodies were tested on murine cells transfected with two clones, which had been isolated by screening a cDNA library with antibodies Y1/82A and EBM11. Cells transfected with the longer cDNA clone, coding for a molecule of M r 110000, reacted with antibodies Y2/131. EBM11. Y1/82A and Ki‐M6, whilst the shorter clone, encoding a molecule of M r 70000 gave the same result except that it did not induce expression of the Ki‐M6 epitope. KP1 antibody did not recognize any transfectants, possibly because of differences in glycosylation by the transfected cell line compared with human tissue. Five of the six antibodies appear to recognize different epitopes (the sixth, Ki‐M7, not having been evaluated in this way). It was concluded that these six antibodies react with a macrophage‐associated antigen for which the gene has been cloned. This group of antibodies has recently been designated CD68 by the Fourth Workshop on Human Leucocyte Differentiation Antigens.