title: CD27-CD27 ligand/CD70 interactions enhance alloantigen-induced proliferation and cytolytic activity in CD8+ T lymphocytes.
abstract: To study the role of CD27-CD27 ligand (CD27L)/CD70 interactions in the generation of murine allospecific T cell responses, SF9 cells or cell membranes expressing recombinant human CD70 were added to in vitro MLC containing C57BL/6 (H-2b) responder cells and class I and II MHC disparate H-2b/d stimulator cells. Alloantigen-specific CTL generation, CD8+ T cell proliferation, and levels of N-alpha-benzyloxycarbonyl-L-lysine thiobenzyl esterase activity were enhanced in the presence of human CD27L/CD70 expressed on SF9 cell membranes. Enhancement of CD8+ T cell responses occurred in the absence of any discernible effects on CD4+ T cell proliferation or IL-2 responses. Additional studies demonstrated that CD27L/CD70-expressing membranes enhanced proliferative responses to class I MHC differences but had no effect on proliferative responses to class II MHC disparities. Enhancement of allospecific CTL generation was also observed when CD27L/CD70-expressing membranes were added only during the last 24 to 48 h of 5-day MLC. Thus, the present studies suggest that CD27-CD27L/CD70 interactions can selectively enhance differentiation of Ag-specific CD8+ T cell effector mechanisms under conditions in which Th cell responses are not altered.
authors.affiliation: Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas 75235, USA.
authors.forename: G R
authors.initials: GR
authors.lastname: Brown
authors.forename: K
authors.initials: K
authors.lastname: Meek
authors.forename: Y
authors.initials: Y
authors.lastname: Nishioka
authors.forename: D L
authors.initials: DL
authors.lastname: Thiele
mesh_terms: D000818:Animals; D015703:Antigens, CD; D001483:Base Sequence; D053282:CD27 Ligand; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002462:Cell Membrane / Q000502:physiology; D003602:Cytotoxicity, Immunologic; D017931:DNA Primers / Q000737:chemistry; D005260:Female; D053804:Granzymes; D006801:Humans; D007376:Interleukin-2 / Q000096:biosynthesis; D007519:Isoantigens / Q000276:immunology; D008213:Lymphocyte Activation; D008565:Membrane Proteins / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008969:Molecular Sequence Data; D017924:Nucleopolyhedroviruses; D011994:Recombinant Proteins; D012697:Serine Endopeptidases / Q000378:metabolism; D018411:Spodoptera; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000378:metabolism*
chemical_list: D015703:Antigens, CD; D053282:CD27 Ligand; C505771:CD70 protein, human; C505772:Cd70 protein, mouse; D017931:DNA Primers; D007376:Interleukin-2; D007519:Isoantigens; D008565:Membrane Proteins; D011994:Recombinant Proteins; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D053804:Granzymes; D012697:Serine Endopeptidases; C509212:GZMA protein, human