Binding of peanut agglutinin (PNA) to normal human peripheral blood mononuclear cells was analyzed on a cell sorter, and compared to the binding of the monocyte specific monoclonal antibodies Mac-1 and Leu-M3. Each of the reagents labeled 9-11% of the mononuclear cells and similar binding patterns were observed. Of the PNA+ cells, 67% adhered to plastic petri dishes, whereas 76% of Mac-1+ cells were adherent. No competition for binding was observed between PNA and Mac-1 on the one hand, or PNA and Leu-M3 on the other. In double staining experiments, about 10% of the cells, comprising 80% of the monocytes, were PNA+ Leu-M3+. Our results show that PNA can serve for the identification and enumeration of monocytes in human peripheral blood.
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