Ontogeny of the Thy-1-, Lyt-2+ murine intestinal intraepithelial lymphocyte. Characterization of a unique population of thymus-independent cytotoxic effector cells in the intestinal mucosa.
Murine intestinal intraepithelial lymphocytes (IEL) from unprimed thymus-bearing and athymic nude mice were characterized according to the expression of murine lymphocyte antigenic markers and cytotoxic activity. The majority of IEL from thymus-bearing mice were Lyt-2+, L3T4- lymphocytes, over half of which did not express Thy-1 surface antigens. Nude IEL and spleen cells were void of Thy-1+ cells; however, Lyt-2 antigens were expressed on a significant proportion of IEL, but not splenic lymphocytes. Overall, 40-70% of IEL from either thymus-bearing or athymic mice expressed the cytotoxic activation antigen, CT-1, and the J11d lymphocyte marker, both of which were associated with a population of Thy-1-, Lyt-2+ cytotoxic IEL. These data are taken to mean that the intestinal epithelium is a site uniquely enriched for activated cytotoxic cells, a significant proportion of which originate as non-thymus-derived lymphocytes with acquired lytic activity.
Klein
J R
JR
D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface / Q000032:analysis; D000955:Antigens, T-Independent; D002454:Cell Differentiation; D003602:Cytotoxicity, Immunologic; D004847:Epithelial Cells; D005260:Female; D007413:Intestinal Mucosa / Q000166:cytology* / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010641:Phenotype; D013602:T-Lymphocytes, Cytotoxic / Q000145:classification* / Q000166:cytology; D018800:Thy-1 Antigens; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7
D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D000955:Antigens, T-Independent; D018800:Thy-1 Antigens; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7