title: Effect of melphalan in vitro on induction of murine suppressor T cells by ConA.
abstract: The effect of treatment with melphalan in vitro on the activity of spleen cells from BALB/c mice was investigated. Incubation of spleen cells with 1.5-5 micrograms melphalan/1 X 10(7) inhibited subsequent mitogenic stimulation by ConA or PHA and the allogeneic response of BALB/c spleen cells against C57B1 target spleen cells. Incubation of spleen cells with ConA led to induction of suppressor T cells which when added to fresh cultures inhibited the allogeneic response. Preincubation of spleen cells with melphalan even at low concentrations (0.15-0.5 micrograms 1 X 10(7) cells) which do not directly affect mitogenic stimulation or allogeneic response partially inhibited the generation of suppressor T cells by ConA. Treatment with melphalan had no effect on already induced suppressor T cells as shown by incubation of spleen cells with melphalan (0.15-5 micrograms/1 X 10(7) cells) after incubation with ConA. Addition of cells treated with melphalan alone (without ConA) to fresh cultures led to an increase in the allogeneic response.
authors.forename: R
authors.initials: R
authors.lastname: Ophir
authors.forename: S
authors.initials: S
authors.lastname: Ben-Efraim
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D007108:Immune Tolerance / Q000187:drug effects*; D066298:In Vitro Techniques; D008213:Lymphocyte Activation / Q000187:drug effects; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D008558:Melphalan / Q000494:pharmacology*; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000166:cytology; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects*
chemical_list: D003208:Concanavalin A; D008558:Melphalan