Increased release of interleukin-1 from mouse peritoneal macrophages in vitro after cisplatin treatment.

The supernatants collected from cis-platin (2 micrograms, 5 micrograms, 10 micrograms, treated macrophage monolayers enhance the proliferation of thymocytes by a submitogenic concentration of con A (1 microgram/ml). The supernatants collected from the untreated macrophage monolayers show a gradual ten fold increase in the interleukin-1 (IL-1) activity during 30 min to 48 h incubation at 37 degrees C. Supernatants collected from macrophage monolayers treated with 2 micrograms/ml of cis-platin show only a marginal increase in IL-1 activity as compared to untreated monolayers. However, compared to controls, 30 to 40 fold increases in IL-1 activity were measured in supernatants collected from the macrophage monolayers incubated with 5, 10 and 20 micrograms/ml cis-platin at 37 degrees C. The IL-1 activity in supernatants collected from macrophage monolayers treated with cis platin and LPS are also compared.