title: Immunosuppressive lymphokine derived from natural suppressor cells.
abstract: Cloned natural suppressor (NS) cells derived from spleens of total lymphoid irradiated BALB/c mice were incubated with the phorbol ester, PMA, and calcimycin for 4 h. After thorough washing, the induced NS cells were incubated in serum-free medium for 24 h and the supernatants were collected. The supernatants suppressed the MLR between normal adult responder and stimulator spleen cells. There was no Ag specificity or H-2 haplotype restriction of the MLR suppression. The supernatants did not inhibit [3H]thymidine incorporation per se, because they did not suppress mitogen stimulation of spleen cells. Protease digestion of the supernatants removed the suppressive activity, and dialysis studies indicated that the molecular size of the suppressive factor was larger than 50,000 Da and smaller than 100,000 Da. The suppressive activity was stable at 56 degrees C, pH 2, for 1 h. Thus, NS cell clones can be induced to secrete an immunosuppressive lymphokine, NS factor.
authors.affiliation: Department of Medicine, Stanford University School of Medicine, CA 94305.
authors.forename: B
authors.initials: B
authors.lastname: Hertel-Wulff
authors.forename: S
authors.initials: S
authors.lastname: Strober
mesh_terms: D000818:Animals; D000001:Calcimycin / Q000494:pharmacology; D003470:Culture Media / Q000032:analysis; D004261:DNA Replication / Q000187:drug effects; D005260:Female; D006863:Hydrogen-Ion Concentration; D008213:Lymphocyte Activation / Q000187:drug effects; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008970:Molecular Weight; D051381:Rats; D011917:Rats, Inbred Lew; D013491:Suppressor Factors, Immunologic / Q000302:isolation & purification* / Q000494:pharmacology; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects / Q000378:metabolism*; D013696:Temperature; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D003470:Culture Media; D013491:Suppressor Factors, Immunologic; D000001:Calcimycin; D013755:Tetradecanoylphorbol Acetate