2B4 stimulation of YT cells induces natural killer cell cytolytic function and invasiveness.
2B4 is a surface molecule found on all human natural killer (NK) cells, a subset of CD8+ T cells, monocytes and basophils. It was originally identified on mouse NK cells and the subset of T cells that mediate non-major histocompatibility complex (MHC)-restricted killing. Recently,9 we have cloned the human homologue of 2B4 (h2B4) and found h2B4 to also mediate non-MHC-restricted cytotoxicity. In this study, we examine h2B4 in regulating various functions of NK cells using a human NK cell line YT, with monoclonal antibody (mAb) C1.7, an antibody that specifically recognizes h2B4. Ligation of surface 2B4 with mAb C1.7 increases YT's ability to destroy tumour cells. In the presence of mAb C1.7, the production of interferon-gamma (IFN-gamma) by YT cells is greatly enhanced. Engagement of surface 2B4 by mAb C1.7 downregulates the expression of h2B4 at the cell surface as well as the expression of h2B4 mRNA. Also, signalling through h2B4 causes the increased expression of matrix metalloproteinase-2, a member of the matrix degrading proteinase family. Thus, in addition to modulating cytolytic function and cytokine production of NK cells, activation through surface 2B4 may play a role in upregulating the machinery for degradation of extracellular matrices to promote invasion of the tumour by NK cells.
Department of Molecular Biology and Immunology and Institute for Cancer Research at the University of North Texas Health Science Center, Fort Worth, TX 76107, USA.
S S
SS
Chuang
M H
MH
Kim
L A
LA
Johnson
P
P
Albertsson
R P
RP
Kitson
U
U
Nannmark
R H
RH
Goldfarb
P A
PA
Mathew
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015703:Antigens, CD; D002460:Cell Line; D003602:Cytotoxicity, Immunologic / Q000276:immunology*; D005786:Gene Expression Regulation / Q000276:immunology; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D007694:Killer Cells, Natural / Q000276:immunology*; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D012333:RNA, Messenger / Q000235:genetics; D011971:Receptors, Immunologic; D000071176:Signaling Lymphocytic Activation Molecule Family; D014407:Tumor Cells, Cultured; D015854:Up-Regulation / Q000276:immunology
D000911:Antibodies, Monoclonal; D015703:Antigens, CD; C084093:CD244 protein, human; C490007:Cd244a protein, mouse; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D011971:Receptors, Immunologic; D000071176:Signaling Lymphocytic Activation Molecule Family; D007371:Interferon-gamma; D020778:Matrix Metalloproteinase 2