title: Evidence that 8-methoxypsoralen (8-MOP) is a T-lymphocyte immunomodulatory agent.
abstract: This study was designed to characterize the effects of the anti-psoriatic compound 8-methoxypsoralen (8-MOP) on human lymphocyte function in vitro. Normal human peripheral blood mononuclear cells were stimulated with an optimal (1%) or a suboptimal (0.05%) concentration of phytohemagglutinin (PHA). At the optimal concentration of PHA, 8-MOP (140 microM) caused a delay in lymphocyte proliferation, interleukin-2 (IL-2) production/accumulation and IL-2 receptor expression. Addition of exogenous IL-2 to cultures stimulated with an optimal concentration of PHA did not overcome the delay of lymphocyte proliferation and IL-2 receptor expression. At the suboptimal concentration of PHA, 8-MOP (140 microM) caused a sustained inhibition of lymphocyte proliferation, IL-2 production/accumulation and IL-2 receptor expression. Addition of exogenous IL-2 under these conditions restored the magnitude of lymphocyte proliferation and IL-2 receptor expression. However, the responses displayed the delayed lymphocyte proliferation and IL-2 receptor expression typical of cells incubated with 8-MOP and an optimal concentration of PHA.
authors.affiliation: Department of Pharmacology, College of Medicine, Ohio State University, Columbus 43210.
authors.forename: G W
authors.initials: GW
authors.lastname: Cox
authors.forename: C G
authors.initials: CG
authors.lastname: Orosz
authors.forename: M G
authors.initials: MG
authors.lastname: Lewis
authors.forename: R G
authors.initials: RG
authors.lastname: Olsen
authors.forename: R H
authors.initials: RH
authors.lastname: Fertel
mesh_terms: D000276:Adjuvants, Immunologic; D000328:Adult; D006801:Humans; D066298:In Vitro Techniques; D007376:Interleukin-2 / Q000096:biosynthesis / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000187:drug effects; D008730:Methoxsalen / Q000494:pharmacology*; D010835:Phytohemagglutinins / Q000494:pharmacology; D015375:Receptors, Interleukin-2 / Q000187:drug effects / Q000378:metabolism; D013601:T-Lymphocytes / Q000187:drug effects* / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D007376:Interleukin-2; D010835:Phytohemagglutinins; D015375:Receptors, Interleukin-2; D008730:Methoxsalen