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Injection of lipopolysaccharide (LPS) into mice was followed by a rapid elevation of colony-stimulating factor (CSF) in the serum. A second, challenging injection of LPS given 3 to 4 days later failed to induce elevated levels of CSF in the serum. Such mice tolerant to LPS were used as an experimental tool to identify the CSF-producing cells which respond to LPS. We observed that generation of LPS-induced CSF in mice tolerant to LPS could be restored by an intraperitoneal injection of spleen cells 24 h before the challenging injection of LPS. Depletion of the adherent cells from the spleen cells reduced the ability of the splenic lymphocytes to restore the capacity of the mice tolerant to LPS to generate serum CSF. Reconstitution of the splenic lymphocytes with 5% thioglycolate-elicited peritoneal macrophages, however, reestablished the restorative capacity of these cells, whereas almost no restoration was observed after direct injection of elicited peritoneal macrophages. These data suggest that the spleen cells are active in generating CSF, provided that macrophages are present and can interact with the splenic lymphocytes to generate LPS-induced CSF in the serum.

infection and immunity

Use of mice tolerant to lipopolysaccharide to demonstrate requirement of cooperation between macrophages and lymphocytes to generate lipopolysaccharide-induced colony-stimulating factor in vivo