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The addition of erythropoietin to cell cultures of erythroid cells of human fetal liver resulted in an increased incorporation of thymidine, adenine, and uridine into trichloroacetic acid-insoluble cell fractions and in an increased uptake of adenine and uridine into the cell. Although the effects of testosterone and erythropoietin on heme synthesis in these cells are known to be very similar, there was no effect of testosterone on the total incorporation of radioactive precursors into DNA or RNA. The RNA synthesized after short pulses of radioactive uridine, when analyzed on sucrose gradients containing 1% sodium dodecyl sulfate, consisted of a homogeneous peak sedimenting at 10 plus or minus 2 S, which is quite different from the heterogeneous, high-molecular-weight RNA synthesized under identical conditions in primary cultures of human fetal lung, kidney, or liver parenchymal cells. Addition of testosterone to liver erythroid cells in cultures for 5 hr followed by a 1-hr uridine pulse resulted in a 3-fold increase of RNA species with an average sedimentation coefficient of 14 plus or minus 3 S. The similarity with the sedimentation coefficient of the globin mRNA described in other systems and the high degree of specialization of the erythroid cells suggest that this RNA may be a stable intermediate involved in the synthesis of hemoglobin.

Testosterone stimulation of a rapidly labeled, low-molecular-weight RNA fraction in human hepatic erythroid cells in culture.