title: Inhibition of MIP-1alpha-induced human neutrophil and monocyte chemotactic activity by reactive oxygen and nitrogen metabolites.
abstract: Peroxynitrite, formed by the reaction between nitric oxide (NO) and superoxide, has been implicated in the pathogenesis of numerous disease processes. Several studies have shown that peroxynitrite-induced protein nitration may compromise enzyme and protein function. We hypothesized that peroxynitrite may regulate cytokine function during inflammation. To test this hypothesis, the neutrophil and monocyte chemotactic responses of macrophage inflammatory protein-1alpha (MIP-1alpha) incubated with and without peroxynitrite were evaluated. Peroxynitrite attenuated neutrophil chemotactic activity (NCA) and monocyte chemotactic activity (MCA) by MIP-1alpha in a dose-dependent manner (P < .05). The inhibitory effects were not significant on NCA and MCA induced by leukotriene B4 or complement-activated serum incubated with peroxynitrite. The reducing agents deferoxamine, dithiothreitol, and exogenous L-tyrosine abrogated the NCA and MCA inhibition by peroxynitrite. Papa-NONOate, an NO donor, or a combination of xanthine and xanthine oxidase to generate superoxide, did not show an inhibitory effect on NCA and MCA induced by MIP-1alpha. In contrast, 3-morpholinosydnonimine (SIN-1), a peroxynitrite generator, elicited a concentration-dependent reduction in NCA and MCA induced by MIP-1alpha. Consistent with its capacity to reduce NCA and MCA, peroxynitrite treatment reduced MIP-1alpha binding to neutrophils and monocytes. Nitrotyrosine was detected in the MIP-1alpha incubated with peroxynitrite. These findings are consistent with nitration of tyrosine by peroxynitrite with subsequent inhibition of MIP-1alpha binding to neutrophils and monocytes and a reduction in NCA and MCA. These data demonstrate that peroxynitrite modulates the inflammatory cell migration by MIP-1alpha, and they suggest that oxidants may play an important role in the regulation of MIP-1alpha-induced inflammatory cell chemotaxis.
authors.affiliation: Southern Arizona and Overton Brooks Veterans Affairs Medical Centers, and the Department of Medicine, University of Arizona, Tucson, USA.
authors.forename: E
authors.initials: E
authors.lastname: Sato
authors.forename: K L
authors.initials: KL
authors.lastname: Simpson
authors.forename: M B
authors.initials: MB
authors.lastname: Grisham
authors.forename: S
authors.initials: S
authors.lastname: Koyama
authors.forename: R A
authors.initials: RA
authors.lastname: Robbins
mesh_terms: D054405:Chemokine CCL3; D054407:Chemokine CCL4; D002634:Chemotaxis, Leukocyte / Q000187:drug effects / Q000502:physiology*; D003165:Complement System Proteins / Q000502:physiology; D003676:Deferoxamine / Q000494:pharmacology; D006801:Humans; D006834:Hydrazines / Q000494:pharmacology*; D066298:In Vitro Techniques; D007975:Leukotriene B4 / Q000494:pharmacology; D019402:Macrophage Inflammatory Proteins / Q000097:blood / Q000494:pharmacology*; D008981:Molsidomine / Q000031:analogs & derivatives / Q000494:pharmacology; D009000:Monocytes / Q000187:drug effects / Q000502:physiology*; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D009566:Nitrates / Q000494:pharmacology*; D009569:Nitric Oxide / Q000494:pharmacology*; D020030:Nitric Oxide Donors / Q000494:pharmacology*; D016877:Oxidants / Q000494:pharmacology*
chemical_list: D054405:Chemokine CCL3; D054407:Chemokine CCL4; D006834:Hydrazines; D019402:Macrophage Inflammatory Proteins; D009566:Nitrates; D020030:Nitric Oxide Donors; D016877:Oxidants; C112653:PAPA NONOate; D007975:Leukotriene B4; C039642:peroxynitric acid; D009569:Nitric Oxide; C002385:linsidomine; D003165:Complement System Proteins; D008981:Molsidomine; D003676:Deferoxamine