[Partial purification of bone marrow cell-stimulating activity from the parenchymal liver cell supernatant]

Mouse bone marrow cell-stimulating activity has been found in the supernatants of mouse parenchymal liver cells. In order to clarify the character, we attempted to purify the activity by a four-step purification procedure involving concentration and chromatographies on DEAE-cellulose, Sephacryl S-300, and Superose 6. By DEAE-cellulose chromatography, the activity was found to be eluted stepwisely with 0.1 M (Peak 1) and 0.2 M (Peak 2) NaCl. Gel filtration revealed that the activities in Peak 1 and Peak 2 had molecular weights of 170,000 and 600,000, respectively. Both preparations of the activity finally obtained derived the cells which spread over the plastic dish from mouse bone marrow cells, but did not stimulate the proliferation of IL-3/GM-CSF dependent cell line, IC2. These results suggest the presence of the bone marrow cell-stimulating activities, which are different from GM-CSF and IL-3, in the parenchymal liver cell supernatants.