Abstract
We have investigated the secretory function of cell suspensions from bone eosinophilic granulomas surgically collected in two patients with histiocytosis X. Unseparated cell preparations spontaneously produced interleukin 1 (IL-1) and prostaglandin E2 (PGE2). In order to ascertain that this secretion was due to the characteristic Langerhans cell-like histiocytosis X cells predominantly found in the bone lesions, we have purified T6+ cells by the use of a fluorescence-activated cell sorter. Such highly purified cell preparations were found to secrete IL-1 and PGE2 spontaneously in culture. Stimulation with endotoxins and treatment with interferon gamma (IFN gamma) revealed an intense IL-1 secretory function of histiocytosis X cells. Since both IL-1 and PGE2 are able to induce bone resorption in vitro, our findings are compatible with the hypothesis that histiocytosis X cells are responsible for the typical osteolytic lesion observed in histiocytosis X through the local secretion of these two mediators.
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