title: Enhanced extracellular growth of Staphylococcus aureus in the presence of selected linear peptide fragments of human interleukin (IL)-1beta and IL-1 receptor antagonist.
abstract: Replication of Staphylococcus aureus is significantly enhanced in the presence of recombinant interleukin (IL)-1beta. In this study, specific binding of IL-1beta to the surface of S. aureus significantly increased growth of S. aureus in the presence of IL-1beta and IL-1ra in a concentration-dependent manner. Although IL-1ra enhanced the growth of S. aureus, there was a significant reduction in IL-1beta-mediated growth enhancement of S. aureus when 25-fold excess amounts of IL-1ra (in comparison with the IL-1beta concentration) were present in the culture medium. Thus, IL-1beta may influence the growth of S. aureus through a receptor-mediated event. By using 5 linear peptides spanning limited regions of IL-1beta, the growth-promoting regions were localized to amino acid residues 118-147 and 208-240. These results build on the newly evolved concept of direct interactions between the soluble mediators of inflammation and infectious agents.
authors.affiliation: Memphis Lung Research Program, Department of Medicine, Divisions of Pulmonary and Critical Care Medicine, University of Tennessee, Memphis, Tennessee, USA. skanangat@utmem.edu
authors.forename: S
authors.initials: S
authors.lastname: Kanangat
authors.forename: M S
authors.initials: MS
authors.lastname: Bronze
authors.forename: G U
authors.initials: GU
authors.lastname: Meduri
authors.forename: A
authors.initials: A
authors.lastname: Postlethwaite
authors.forename: F
authors.initials: F
authors.lastname: Stentz
authors.forename: E
authors.initials: E
authors.lastname: Tolley
authors.forename: D
authors.initials: D
authors.lastname: Schaberg
mesh_terms: D003470:Culture Media; D004305:Dose-Response Relationship, Drug; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000494:pharmacology*; D010446:Peptide Fragments / Q000494:pharmacology*; D012795:Sialoglycoproteins / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000254:growth & development
chemical_list: D003470:Culture Media; C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D010446:Peptide Fragments; D012795:Sialoglycoproteins