Abstract
Patients with systemic lupus erythematosus (SLE) experience clinical flares in association with superimposed bacterial infection. To investigate whether heightened immune phenomena during the course of bacterial infections were related to abnormal disposal of immune complexes, we administered bacterial lipopolysaccharide (LPS) to C57BL/6 mice for 5 weeks. Control mice received vehicle only. We then challenged the mice with a subsaturating dose of radiolabelled immune complexes intravenously and determined the localization of immune complexes in liver, spleen and kidney. In comparison to control mice, mice exposed to LPS developed features of polyclonal B cell activation, autoimmune phenomena, delayed removal of immune complexes from the circulation, diminished liver uptake of immune complexes, and enhanced localization of immune complexes in the kidneys. The findings could not be attributed to biological processes dependent on complement concentration. Instead, interferences with Fc receptor function, or with endocytosis of immune complexes may represent likely possibilities. Thus, clinical flares in patients with SLE, in the presence of a superimposed infection, may result from enhanced localization of immune complexes in organs due to altered mechanisms of their disposal.
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