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Evolutionary Conservation of a Human Function‐Associated Molecule on Murine Natural Killer Cells: Expression and Function
Author(s) -
KAPUR R.,
EVANS D. L.,
HARRIS D. T.
Publication year - 1994
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/j.1365-3083.1994.tb03432.x
Subject(s) - lymphokine activated killer cell , interleukin 21 , natural killer t cell , biology , interleukin 12 , lymphokine , natural killer cell , microbiology and biotechnology , monoclonal antibody , janus kinase 3 , cytotoxic t cell , nk 92 , antigen , antibody , t cell , immunology , immune system , in vitro , biochemistry
Using a novel anti‐natural killer (NK) cell monoclonal antibody (MoAb), we have recently identified an evolutionary conserved function‐associated molecule (FAM) present on fish, rat and human NK cells. This molecule is involved in NK cell function as anti‐FAM MoAbs inhibit cytotoxicity, stimulate lymphokine secretion and inhibit conjugate formation between effector cells and target cells. We now have examined murine NK cells for the presence of this structure. It was observed by two‐colour flow cytometric analysis that the anti‐FAM MoAb 5C6 specifically bound to a subpopulation of nylon wool non‐adherent splenic lymphocytes (19–20%). The expression of the FAM molecule was restricted to NK cells that expressed the NK1.1 antigen. Neither T cells, B cells, nor macrophages reacted with the anti‐FAM MoAb. Analysis of FAM expression in various lymphoid tissues revealed that splenocytes expressed the greatest numbers of MoAb(+) cells. Generation of lymphokine‐activated killer (LAK) cells and adherent tymphokine‐activated killer (ALAK) cells resulted in higher levels of FAM expression. The anti‐FAM MoAb 5C6 also detected the presence of FAM on fresh SCID NK cells. It was demonstrated that the anti‐FAM MoAb 5C6 inhibited the lysis of target cells by endogenous NK cells, activated NK cells, 5d LAK cells, ALAK cells and SCID NK cells. Moreover, conjugate assays demonstrated involvement of this molecule in recognition between NK cells and target cells.