Appearance of increased proportions of monocytes bearing the 72kd(FcRI) receptor for IgG correlated to aberrant monocyte (MO) functions, depressed immune functions, and poor clinical outcome. The trauma patients' FcRI+ MO subpopulation produced the majority of their elevated IL-6, TNF alpha, TGF beta, and PGE2. IgG stimulation of patients' MO through FcRI not only stimulated TNF alpha, IL-6, and PGE2 levels, but also greatly augmented the levels of these monokines produced after subsequent bacterial challenge. Post-trauma increased IL-6 levels can lead to polyclonal B-cell activation and high levels of circulating, nonspecific IgG as seen in trauma patients. This nonspecific IgG triggers the FcRI on the increased numbers of FcRI+ MO leading to ever-increasing monokine levels. IL-4 was found to downregulate patients' FcRI+ MO production of mediators. The cycle of altered cytokine levels, increased FcRI+ MO numbers, elevated IgG, and augmented triggering of FcRI+ MO may be broken by addition of IL-4.
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