Phenol-soluble modulin alpha 3 enhances the human neutrophil lysis mediated by Panton-Valentine leukocidin.
Panton-Valentine leukocidin (PVL) has long been considered a critical toxin in severe Staphylococcus aureus infection. PVL presumably breaches the body's defense system by lysing human polymorphonuclear cells (PMNs). Recently, however, bioactive peptides--phenol-soluble modulins (PSMs)--have been proposed as the main player in the lysis of PMNs, rather than PVL. This study aimed to resolve uncertainty concerning the cause of the lysis of human PMNs by using recombinant PVL toxins and PVL-neutralizing monoclonal antibodies. The recombinant PVL toxins showed strong lytic activity against human but not murine neutrophils. Moreover, the lytic activity of culture supernatants of strains USA400 MW2 and USA300 FPR3757 were completely neutralized by anti-PVL monoclonal antibodies. In contrast, phenol-soluble modulin alpha 3--the most potent PSM peptide--failed to lyse human PMNs at the concentrations contained in the culture supernatants. Phenol-soluble modulin alpha 3 did, however, enhance PVL-mediated lysis of human PMNs.
Hongo
Isamu
I
Department of Infection Control Science, Graduate School of Medicine, Juntendo University, Tokyo, Japan.
Baba
Tadashi
T
Oishi
Kanenari
K
Morimoto
Yuh
Y
Ito
Teruyo
T
Hiramatsu
Keiichi
K
D000328:Adult; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000992:Antitoxins / Q000276:immunology; D001427:Bacterial Toxins / Q000633:toxicity*; D002470:Cell Survival; D005098:Exotoxins / Q000633:toxicity*; D006801:Humans; D007956:Leukocidins / Q000633:toxicity*; D051379:Mice; D009500:Neutralization Tests; D009504:Neutrophils / Q000187:drug effects*; D011994:Recombinant Proteins / Q000633:toxicity; D013211:Staphylococcus aureus / Q000276:immunology*
D000911:Antibodies, Monoclonal; D000992:Antitoxins; D001427:Bacterial Toxins; D005098:Exotoxins; D007956:Leukocidins; C078284:Panton-Valentine leukocidin; D011994:Recombinant Proteins; C025971:staphylococcal delta toxin