Factors influencing neutrophil retention on glass bead columns

Comparative studies on the adhesiveness of granulocytes of guinea pig and man

The high affinity of granulocytes of guinea pig and man to glass surfaces is modified by serum. Native serum contains both an adherence-promoting activity, which is related to complement, and components which reduce the adhesiveness of granulocytes. These components are stable at 56 degrees C for 30 min and are tightly bound to the glass surface. beta-Lipoproteins are candidates for this adherence reducing ability of serum. Adherence promotion by native serum is mediated by coating the glass surface with C3b/C3bi. Human granulocytes from the peripheral blood adhered pig serum with C3b/C3bi to almost the same extent as in the presence of native serum, but on guinea pig granulocytes elicited in the peritoneal cavity, a cell surface metalloproteinase degraded the C3b/C3bi, thus reducing the adhesiveness of these cells. This proteinase was inhibited by MgEDTA, DTT, and 1,10-phenanthroline, whereby the high adhesiveness of granulocytes was restored to C3b/C3bi-coated glass.

Stimulation of granulocyte adhesiveness by the chemotactic peptide N-formyl-L-methionyl-L-phenylalanine

The in vitro effects of the peptide N-formyl-L-methionyl-L-phenylalanine on granulocytes adhesiveness and chemotaxis were investigated. N-formyl-L-methionyl-L-phenylalanine, when used at concentration chemotactically effective, increased significantly granulocyte adhesiveness. When granulocyte adhesiveness was inhibited by colchicine, the inhibition could not be reversed by subsequent treatment with N-formyl-L-methionyl-L-phenylalanine. These results suggest that microtubular system is involved in the stimulation of granulocyte adhesiveness by N-formyl-L-methionyl-L-phenylalanine.