title: LIGHT is constitutively expressed on T and NK cells in the human gut and can be induced by CD2-mediated signaling.
abstract: The TNF superfamily cytokine, lymphotoxin-like inducible protein that competes with glycoprotein D for binding herpesvirus entry mediator on T cells (LIGHT; TNFSF14), can augment T cell responses inducing IFN-gamma production and can drive pathological gut inflammation when expressed as a transgene in mouse T cells. LIGHT expression by human intestinal T cells suggests the possibility that LIGHT may play a key role in regulation of the mucosal immune system. A nonenzymatic method was developed for the isolation of T cells from the human lamina propria, permitting analysis of native cell surface protein expression. Cell surface LIGHT was constitutively expressed on mucosal T and NK cells and a subpopulation of gut-homing CD4(+) T cells in the periphery. In addition, CD2-mediated stimulation induced efficient LIGHT expression on intestinal CD4(+) T cells, but not on peripheral blood T cells, suggesting a gut-specific, Ag-independent mechanism for LIGHT induction. By contrast, herpesvirus entry mediator expression on gut T cells was unperturbed, implicating the transcriptional regulation of LIGHT as a mechanism modulating signaling activity in the gut. Quantitative analysis of LIGHT mRNA in a cohort of inflammatory bowel disease patients indicated elevated expression in biopsies from small bowel and from inflamed sites, implicating LIGHT as a mediator of mucosal inflammation.
authors.affiliation: Cedars-Sinai Inflammatory Bowel Disease Center, Los Angeles, CA 90048, USA.
authors.forename: Offer
authors.initials: O
authors.lastname: Cohavy
authors.forename: Jaclyn
authors.initials: J
authors.lastname: Zhou
authors.forename: Carl F
authors.initials: CF
authors.lastname: Ware
authors.forename: Stephan R
authors.initials: SR
authors.lastname: Targan
mesh_terms: D000328:Adult; D018801:CD2 Antigens / Q000502:physiology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D002478:Cells, Cultured; D006801:Humans; D007249:Inflammation / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D015212:Inflammatory Bowel Diseases / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D007413:Intestinal Mucosa / Q000166:cytology / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D007421:Intestine, Small / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D007694:Killer Cells, Natural / Q000276:immunology / Q000378:metabolism*; D008213:Lymphocyte Activation; D008565:Membrane Proteins / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics*; D012333:RNA, Messenger / Q000096:biosynthesis; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis; D053240:Receptors, Tumor Necrosis Factor, Member 14; D011991:Receptors, Virus / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism*; D053326:Tumor Necrosis Factor Ligand Superfamily Member 14; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000235:genetics*
chemical_list: D018801:CD2 Antigens; D008565:Membrane Proteins; D012333:RNA, Messenger; D018124:Receptors, Tumor Necrosis Factor; D053240:Receptors, Tumor Necrosis Factor, Member 14; D011991:Receptors, Virus; C506028:TNFRSF14 protein, human; C505914:TNFSF14 protein, human; C506029:Tnfrsf14 protein, mouse; C505915:Tnfsf14 protein, mouse; D053326:Tumor Necrosis Factor Ligand Superfamily Member 14; D014409:Tumor Necrosis Factor-alpha