Regulation of human T-cell production of interleukin 2 by Leu 11 (CD16) positive large granular lymphocytes.
Peripheral blood large granular lymphocytes (LGL) expressing Leu 11 (CD16) antigen with potent natural killer cytotoxicity inhibited soluble antigen-induced T-cell production of interleukin 2 (IL-2). Depletion of Leu 11-reactive cells from T-cells doubled IL-2 activity (P less than 0.05). Leu 11-enriched cells did not express high affinity IL-2 receptors nor did they deplete IL-2 activity from culture media. Upon addition in low ratios to Leu 11-depleted cells, Leu 11-enriched fractions increased antigen-induced IL-2 production three-fold (P less than 0.05), whereas at higher ratios IL-2 production was suppressed P less than 0.01. Additionally, adherent monocytes were increasingly accessory when added in graded numbers to Leu 11-depleted but not T-cell cultures. In the presence of small numbers (5%) of Leu 11-enriched cells, however, monocytes down-regulated IL-2 production of Leu 11-depleted cell cultures. Thus Leu 11-reactive lymphocytes have noncytotoxic functions and may play a major role in immunoregulation.
Toossi
Z
Z
Department of Medicine, Case Western Reserve University, Cleveland, Ohio.
Paris
M R
MR
Purvis
S F
SF
Ellner
J J
JJ
D000938:Antigen-Presenting Cells / Q000276:immunology; D000943:Antigens, Differentiation / Q000032:analysis*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D015232:Dinoprostone / Q000494:pharmacology; D004306:Dose-Response Relationship, Immunologic; D006801:Humans; D066298:In Vitro Techniques; D007376:Interleukin-2 / Q000096:biosynthesis*; D007694:Killer Cells, Natural / Q000145:classification / Q000276:immunology*; D008211:Lymphocyte Cooperation; D009000:Monocytes / Q000276:immunology; D011961:Receptors, Fc / Q000032:analysis*; D017452:Receptors, IgG; D015375:Receptors, Interleukin-2 / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D007376:Interleukin-2; D011961:Receptors, Fc; D017452:Receptors, IgG; D015375:Receptors, Interleukin-2; D015232:Dinoprostone