title: The suppressive effect of a synthetic retroviral peptide on the human IFN gamma production is abrogated by the combined stimulation with IL-1 and IL-2.
abstract: Certain retroviral envelope proteins and peptides have been shown to be highly immunosuppressive. Recently, we have demonstrated that a synthetic 17 amino acid peptide (CKS-17*) homologous to a highly conserved region in the transmembrane portion of the envelope of several human or animal retroviruses suppresses the production of human interferon-gamma (IFN gamma) by human peripheral blood leukocytes (PBL). In the present investigation, we studied the role of exogenous IL-1 or IL-2, and IL-1 plus IL-2 on the suppressive action of CKS-17* in the production of IFN gamma. The results showed that preculture of PBL with CKS-17* reduced the production of IFN gamma in a dose-dependent manner. The addition of IL-1 or IL-2 reduced, in part, this suppression of IFN gamma production. Full abrogation of the inhibition attributable to CKS-17, however, occurred only when PBL precultured with CKS-17* were recultured with staphylococcus enterotoxin A (SEA) together with exogenous IL-1 plus IL-2. These results show that the inhibition of IFN-gamma production by CKS-17* is reversible. The findings indicate that cytokines can modulate certain of the immunosuppressive actions attributable to retroviruses or their components and suggest that some cytokines influence immunosuppressive consequences of retroviral infection.
authors.affiliation: Department of Pediatrics, University of South Florida, All Children's Hospital, St. Petersberg 33701.
authors.forename: M
authors.initials: M
authors.lastname: Ogasawara
authors.forename: G J
authors.initials: GJ
authors.lastname: Cianciolo
authors.forename: M
authors.initials: M
authors.lastname: Mitani
authors.forename: T
authors.initials: T
authors.lastname: Kizaki
authors.forename: R A
authors.initials: RA
authors.lastname: Good
authors.forename: N K
authors.initials: NK
authors.lastname: Day
mesh_terms: D002478:Cells, Cultured; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D007371:Interferon-gamma / Q000096:biosynthesis*; D007375:Interleukin-1 / Q000494:pharmacology*; D007376:Interleukin-2 / Q000494:pharmacology*; D007962:Leukocytes / Q000276:immunology; D010455:Peptides / Q000037:antagonists & inhibitors*; D011863:Radioimmunoassay; D011994:Recombinant Proteins; D015682:Retroviridae Proteins, Oncogenic / Q000037:antagonists & inhibitors*
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D007375:Interleukin-1; D007376:Interleukin-2; D010455:Peptides; D011994:Recombinant Proteins; D015682:Retroviridae Proteins, Oncogenic; D007371:Interferon-gamma; C053692:CKS 17