title: P-selectin requirement for neutrophil accumulation and injury in the direct passive Arthus reaction.
abstract: The aim of this study was to investigate the role of P-selectin in the accumulation of neutrophils in the direct passive Arthus reaction in rat skin. Direct passive Arthus dermal reaction was induced in male Sprague-Dawley (SD) rats by a single i.v. injection of rat anti-sheep globulin (SG) 1 h before i.d. injection of SG antigen. Anti-P-selectin or irrelevant control antibody was given 1 h before rat anti-SG injection. Complement depletion was also performed in a separate group by pretreatment with cobra venom factor (CVF). In all groups dermal swelling was assessed 4 h after antigen challenge. Four hours after antigen challenge, rats treated with control antibody developed skin swelling (2.29 +/- 0.47 mm), prominent complement deposition and neutrophil accumulation. This response was associated with local up-regulation of endothelial P-selectin. Pre-treatment with anti-P-selectin antibody 1 h before passive Arthus induction prevented skin swelling (0.29 +/- 0.06 mm, P < 0.05, cf with control antibody treatment), neutrophil accumulation and up-regulation of endothelial P-selectin despite complement deposition. CVF treatment prevented complement deposition, neutrophil accumulation and skin swelling (0.13 +/- 0.07 mm, P < 0.05, cf with saline treatment). However, endothelial P-selectin expression was still present. Inhibition of skin swelling and neutrophil accumulation in direct passive Arthus by functional inhibition of P-selectin suggest a pivotal role for this adhesion molecule in this inflammatory process. These results also suggest that multiple steps are involved in the evolution of direct passive Arthus, including both P-selectin expression and complement activation. However, while complement activation is essential for neutrophil accumulation and expression of dermal injury, P-selectin up-regulation initiated by antibody/antigen deposition occurs independently of complement activation.
authors.affiliation: Centre for Inflammatory Diseases, Monash University, Monash Medical Centre, Clayton, Victoria, Australia.
authors.forename: L L
authors.initials: LL
authors.lastname: Santos
authors.forename: X R
authors.initials: XR
authors.lastname: Huang
authors.forename: M C
authors.initials: MC
authors.lastname: Berndt
authors.forename: S R
authors.initials: SR
authors.lastname: Holdsworth
mesh_terms: D000818:Animals; D001183:Arthus Reaction / Q000276:immunology*; D003167:Complement Activation / Q000187:drug effects; D003169:Complement Inactivator Proteins / Q000494:pharmacology; D004546:Elapid Venoms / Q000494:pharmacology; D007124:Immunoenzyme Techniques; D008297:Male; D008856:Microscopy, Fluorescence; D009504:Neutrophils / Q000187:drug effects / Q000276:immunology*; D019007:P-Selectin / Q000502:physiology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D003169:Complement Inactivator Proteins; D004546:Elapid Venoms; D019007:P-Selectin; C016310:cobra venom factor