| Abstract: | Exposure of murine leukemia cells in culture to bis-acetyl-diaminopentane (BADP) caused erythroid maturation as measured by the accumulation of hemoglobin in treated cells. The appearance of differentiated cells in cultures exposed to BADP occurred 18 to 20 hours earlier than in those treated with dimethylsulfoxide (DMSO), a standard inducer of differentiation in this system. Studies with [3H]BADP indicated the occurrence of relatively rapid association of the inducer with cells, and subsequent linear accumulation. Fractionation of cellular components and measurement of radioactivity from BADP therein demonstrated that this agent preferentially associates with a fraction enriched for plasma membrane. In addition, [3H]BADP was capable of binding to the plasma membrane-enriched fraction isolated from murine erythroleukemia cells as measured by gel filtration. These findings support the concept that interaction of inducers of murine erythroleukemia differentiation such as BADP with components of the surface membrane may be important in the cascade of events that lead to the erythroid maturation of these leukemic cells. |
