A Monoclonal Antibody to the Membrane Glycoprotein Complex CD18 Inhibits Polymorphonuclear Leukocyte Accumulation and Plasma Leakage In Vivo

Previous in vitro findings suggest a critical role for the polymorphonuclear leukocyte (PMN) membrane glycopro tein complex CD18 in PMN adherence and chemotaxis. We examined the effect of the murine monoclonal antibody (MoAb) 60.3, recognizing CD18, on induced PMN accumu lation in vivo. Rabbits were...

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Bibliographic Details
Published in:Blood 1987-01, Vol.69 (1), p.338-340
Main Authors: Arfors, Karl-E., Lundberg, Claes, Lindbom, Lennart, Lundberg, Kerstin, Beatty, Patrick G., Harlan, John M.
Format: Article
Language:English
Subjects:
Animals
Antibodies, Monoclonal
Antigens, Surface - physiology
Biological and medical sciences
Capillary Permeability
Cell Adhesion
Fundamental and applied biological sciences. Psychology
Fundamental immunology
Glycoproteins - physiology
Immunobiology
Inflammation - physiopathology
Lymphocyte Function-Associated Antigen-1
Membrane Proteins - physiology
Myeloid cells: ontogeny, maturation, markers, receptors
Neutrophils - physiology
Rabbits
Zymosan - pharmacology
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Summary:Previous in vitro findings suggest a critical role for the polymorphonuclear leukocyte (PMN) membrane glycopro tein complex CD18 in PMN adherence and chemotaxis. We examined the effect of the murine monoclonal antibody (MoAb) 60.3, recognizing CD18, on induced PMN accumu lation in vivo. Rabbits were pretreated with MoAb 60.3, and the chemotactic factors fMLP, leukotriene (LT)B4, and C5a, as well as histamine, were injected intradermally; 4 hours later, plasma leakage (125l-albumin) and the PMN accumulation (myeloperoxidase) were determined. Both PMN accumulation and PMN-dependent plasma leakage were abolished in the inflammatory skin lesions of rabbits pretreated with MoAb 60.3 as compared with control animals, whereas histamine-induced PMN-independent plasma leakage was unaffected. Intravital microscopy of the rabbit tenuissimus muscle revealed that MoAb 60.3 inhibited both PMN adherence in the venules and migration into the tissue following application of LTB4 and zymosan-activated serum (ZAS). Rolling of PMNs along the venular endothelium was unaffected. Thus, these experiments confirm and extend earlier in vitro findings of the critical role of the membrane glycoprotein complex, CD18, in PMN adherence and chemotaxis.
ISSN:0006-4971
1528-0020
DOI:10.1182/blood.V69.1.338.338