Effect of divalent cations on adhesion of polymorphonuclear leukocytes to matrix molecules in vitro.
Adhesion of N-formyl-methionyl-leucylphenylalanine-stimulated human polymorphonuclear leukocytes (PMNs) to dishes coated with laminin, fibronectin, or collagen types I and IV was dependent on the presence of magnesium (Mg2+) but not calcium (Ca2+). Addition of manganese (Mn2+) in combination with Ca2+ and Mg2+ further increased the number of PMNs adhering to the matrix proteins. Monoclonal antibody 60.3 (mAb 60.3) was equally effective at inhibiting adhesion of PMNs to all the matrix proteins. The presence of Mn2+ (50 microM), in addition to 1 mM Ca2+ and Mg2+, required higher concentrations of mAb 60.3 to inhibit adhesion of PMNs to collagens type I or IV, suggesting increased affinity of PMNs for these substrates. These findings suggest that the PMNs may regulate the affinity of CD11/CD18 for multiple ligands by binding different divalent cations to the receptor.
Lundgren-Akerlund
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La Jolla Institute for Experimental Medicine, California.
Berger
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Arfors
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KE
D015703:Antigens, CD / Q000032:analysis; D018845:CD11 Antigens; D018821:CD18 Antigens; D002118:Calcium / Q000494:pharmacology*; D002448:Cell Adhesion / Q000187:drug effects; D006801:Humans; D066298:In Vitro Techniques; D008274:Magnesium / Q000494:pharmacology*; D008345:Manganese / Q000494:pharmacology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000502:physiology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
D015703:Antigens, CD; D018845:CD11 Antigens; D018821:CD18 Antigens; D008345:Manganese; D009240:N-Formylmethionine Leucyl-Phenylalanine; D008274:Magnesium; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium