title: Cloning of T-lymphocytes in systemic lupus erythematosus.
abstract: Colony-forming T-lymphocytes were studied in the blood of twenty-two patients with systemic lupus erythematosus (SLE) by the technique of plating phytohaemagglutinin (PHA) stimulated lymphocytes in soft agar. The mean count of T-lymphocyte colonies in SLE of 70+/-64 (1 s.d.)/mm3 of blood was considerably less than the count of 218+/-102/mm3 for healthy young adults and of 139+/-99/mm3 for aged persons. In SLE, counts of T-lymphocyte colonies correlated with low counts of T-lymphocytes in blood and with other indices of T-lymphocyte impairment. The data point to derangement of factors which influence the capacity of T-lymphocytes to proliferate, but it cannot be stated to what degree this is a cause and/or result of the autoimmune disease process associated with SLE. Cloning of peripheral blood T-cells could help determine whether the essential defect in SLE is in the T-lymphocyte or one of its sub-sets, or in factors produced by adherent cells which are essential for growth in vitro of T-lymphocyte colonies.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000974:Antibodies, Antinuclear / Q000032:analysis; D002999:Clone Cells; D003114:Colony-Forming Units Assay; D004247:DNA / Q000276:immunology; D005260:Female; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000276:immunology; D007958:Leukocyte Count; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D010835:Phytohemagglutinins / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000974:Antibodies, Antinuclear; D010835:Phytohemagglutinins; D004247:DNA