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Research Article

Up-regulation of human neutrophil receptors for Neisseria gonorrhoeae expressing PII outer membrane proteins.

C F Farrell, R F Rest
C F Farrell
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R F Rest
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ABSTRACT

In the absence of serum, nonpiliated gonococci expressing PII outer membrane proteins (PIIs) adhere to human neutrophils whereas non-PII-expressing (PII-) gonococci do not. After an observation that neutrophils in monolayers bound more gonococci than neutrophils in suspension, we treated neutrophil suspensions with known stimulants of degranulation and measured subsequent gonococcal adherence to suspended neutrophils. The chemotactic peptide N-formyl-methionyl-leucyl-phenylalanine (fmlp), the potent secretagogue phorbol myristate acetate, and the calcium ionophore A23187 all caused increased adherence of PII+ gonococci, but not PII- gonococci, to neutrophils in a dose-responsive manner. Increased adherence of gonococci to neutrophils was paralleled by increased degranulation of neutrophil myeloperoxidase, lysozyme, and lactoferrin. Inhibition of fmlp-induced neutrophil degranulation by pertussis toxin, the calmodulin inhibitors trifluoperazine and N-5-chloronaphthalene sulfonamide, or the intracellular calcium-binding agent trimethoxybenzoic acid also inhibited fmlp-induced gonococcal adherence to neutrophils. Neither undifferentiated nor myelocytically differentiated HL-60 cells, which possess primary but defective or nonexistent secondary granules, bound PII+ or PII- gonococci. Gonococci did not adhere to human monocytes, monocyte-derived macrophages, lymphocytes, platelets, or erythrocytes, indicating that several receptors, such as the complement receptors CR1, CR3 (CD11b/CD18), and CR4 (CD11c/CD18) or the adherence complex LFA-1 (CD11a/CD18), were probably not involved in gonococcal adherence to human neutrophils.

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Up-regulation of human neutrophil receptors for Neisseria gonorrhoeae expressing PII outer membrane proteins.
C F Farrell, R F Rest
Infection and Immunity Sep 1990, 58 (9) 2777-2784; DOI:

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Up-regulation of human neutrophil receptors for Neisseria gonorrhoeae expressing PII outer membrane proteins.
C F Farrell, R F Rest
Infection and Immunity Sep 1990, 58 (9) 2777-2784; DOI:
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