Neutrophil chemotactic activity and C5a following systemic activation of complement in rats.
Using ELISA analysis, rat C5a was stimulated in serum from rats undergoing systemic activation of complement after intravenous infusion of purified cobra venom factor (CVF). Biological (neutrophil chemotactic) activity was also assessed. Serum levels of C5a were directly proportional to the amount of CVF infused. C5a and neutrophil chemotactic activity, peaked by 5 min, then plateaued. In vitro addition of anti-C5a to serum samples of CVF-infused rats totally abolished chemotactic activity, indicating that all biological activity could be ascribed to C5a. Blood neutrophils obtained from CVF-infused animals showed a significant upregulation of CD11b, the increase being reduced (38%) in animals pretreated with anti-C5a. These findings indicate that infusion of CVF into rats produces generation of C5a, all chemotactic activity in serum being related to C5a. The in vivo generation of C5a is, at least inpart, responsible for upregulation of CD11b on blood neutrophils.
Schmid
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Department of Pathology, University of Michigan Medical School Ann Arbor 48109, USA.
Warner
R L
RL
Crouch
L D
LD
Friedl
H P
HP
Till
G O
GO
Hugli
T E
TE
Ward
P A
PA
D000818:Animals; D000906:Antibodies / Q000494:pharmacology; D002634:Chemotaxis, Leukocyte / Q000187:drug effects; D003167:Complement Activation / Q000187:drug effects; D015936:Complement C5a / Q000037:antagonists & inhibitors / Q000378:metabolism*; D004546:Elapid Venoms / Q000633:toxicity; D066298:In Vitro Techniques; D007700:Kinetics; D008168:Lung / Q000187:drug effects / Q000276:immunology; D055370:Lung Injury; D016177:Macrophage-1 Antigen / Q000378:metabolism; D008297:Male; D009504:Neutrophils / Q000187:drug effects / Q000276:immunology*; D011817:Rabbits; D051381:Rats; D015854:Up-Regulation
D000906:Antibodies; D004546:Elapid Venoms; D016177:Macrophage-1 Antigen; C016310:cobra venom factor; D015936:Complement C5a