title: Production of a human T lymphocyte chemotactic factor by T cell subpopulations.
abstract: Concanavalin A-stimulated human peripheral blood mononuclear cells release a lymphocyte chemotactic factor. This lymphocyte chemotactic factor is produced optimally after 24 to 48 hr of culture and is not found before 3 hr of culture, which suggests that the factor is synthesized de novo and is not preformed and secreted after Con A stimulation. This is further supported by experiments showing that the protein synthesis inhibitors cycloheximide and puromycin totally prevent the production of the chemotactic factor. Experiments using cultured and uncultured T lymphocytes as responding cells show that cultured T cells respond more efficiently than uncultured T cells to this factor. Furthermore, the lymphocyte chemotactic factor preferentially stimulates T lymphocyte locomotion as compared to peripheral blood non-T lymphocyte migration. Fractionation of mononuclear cells into glass nonadherent lymphocytes, monocyte-enriched preparations, T lymphocytes, and non-T lymphocytes shows that lymphocyte chemotactic factor is produced by Con A-stimulated, glass nonadherent lymphocytes and T cells but not by monocytes or non-T lymphocytes. Further fractionation of T lymphocytes into Leu-2 and Leu-3 T cell subpopulations shows that the production of T lymphocyte chemotactic factor can be attributed to the Leu-2 suppressor/cytotoxic T cell subset. The generation of a T lymphocyte chemotactic factor by Leu-2 T cells may represent a means of recruiting other T cells to the site of its release.
mesh_terms: D019744:Chemokines, C; D002634:Chemotaxis, Leukocyte; D003208:Concanavalin A / Q000494:pharmacology; D003513:Cycloheximide / Q000494:pharmacology; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects; D008222:Lymphokines / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D012795:Sialoglycoproteins / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D013601:T-Lymphocytes / Q000145:classification / Q000378:metabolism*; D013602:T-Lymphocytes, Cytotoxic / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000378:metabolism
chemical_list: D019744:Chemokines, C; D008222:Lymphokines; D012795:Sialoglycoproteins; C092390:XCL1 protein, human; C018997:lymphotactin; D003208:Concanavalin A; D003513:Cycloheximide