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. 1984 Nov;46(2):332–339. doi: 10.1128/iai.46.2.332-339.1984

Monocyte suppression of Fusobacterium nucleatum-induced human polyclonal B-lymphocyte activation.

"V体育安卓版" D F Mangan, "V体育官网入口" T Won, D E Lopatin
PMCID: PMC261535  PMID: 6334029

Abstract

Previous studies reported that Fusobacterium nucleatum induced polyclonal B-lymphocyte activation (PBA) as determined by immunoglobulin M production in cultures of human peripheral blood mononuclear cells. However, the PBA response was greatly enhanced when the cells were depleted of esterase-positive, adherent cells (i. e. , monocytes). The purpose of this study was to confirm and further examine the suppression of F. nucleatum-induced PBA (F. nucleatum-PBA) by blood monocytes. For comparison, PBA induced by pokeweed mitogen (PWM-PBA), which is enhanced by monocytes, was assessed in some experiments V体育ios版. We found the removal of monocytes from unfractionated cells by (i) Sephadex G-10, (ii) anti-monocyte specific OM-1 monoclonal antibody plus complement, or (iii) L-leucine methyl ester, a compound which selectively kills lysosome-rich cells, resulted in a population of cells responsive to F. nucleatum-PBA and unresponsive to PWM-PBA. The addition of double adherence-purified monocytes (greater than 85% esterase-positive cells), particularly in concentrations of greater than 10%, to lymphocytes depleted of monocytes by G-10, OM-1, or L-leucine methyl ester treatments, suppressed F. nucleatum-PBA and enhanced PWM-PBA. Monocytes also suppressed a mixture of isolated T and B cells combined in a T/B cell ratio of 3:1, which is an optimal ratio for F. nucleatum-PBA. Allogeneic monocytes suppressed F. nucleatum-PBA, although at low numbers these cells were not as suppressive as autologous monocytes. Heating at 56 degrees C for 15 min, sonicating, or freeze-thawing the monocyte preparations resulted in an abrogation of monocyte-induced suppression of F. nucleatum-PBA. Kinetic studies in which fresh monocytes were added daily to lymphocytes stimulated with F. nucleatum or PWM showed that the monocytes must be added within the first 2 days of culture to suppress F. nucleatum-PBA or enhance PWM-PBA. Monocytes incubated with F. nucleatum for 48 h released into the culture medium a soluble factor that suppressed F. nucleatum-PBA. The results from this study demonstrate a potent mechanism by which the host might prevent exaggerated nonspecific immunoglobulin responses when exposed to PBA-inducing concentrations of F. nucleatum. On the other hand, the induction of suppressive monocytes (or monocyte-mediated suppressive factors) by interaction with F. nucleatum might result in the inhibition of host protective immune reactions.

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