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. 1990 Jan;85(1):300–304. doi: 10.1172/JCI114428

Growth factor-dependent initiation of DNA replication in nuclei isolated from an interleukin 3-dependent murine myeloid cell line.

N C Munshi 1, T G Gabig 1
PMCID: PMC296419  PMID: 2104881

Abstract

To study the proliferative response of hematopoietic cells to growth factors at the molecular level, we developed a cell-free system for growth factor-dependent initiation of genomic DNA replication. Nuclei were isolated from the IL-3-dependent cell line NFS/N1-H7 after a 10-h period of IL-3 deprivation. Cytosolic and membrane-containing subcellular fractions were prepared from proliferating NFS/N1-H7 cells. Nuclei from the nonproliferating cells (+/- IL-3) showed essentially no incorporation of [3H]thymidine during a 16-h incubation with a mixture of unlabeled GTP, ATP, UTP, CTP, dGTP, dATP, dCTP, and [3H]dTTP. When the combination of IL-3, a cytosolic fraction, and a membrane-containing fraction from proliferating cells was added to nuclei from nonproliferating cells, a burst of [3H]thymidine incorporation into DNA began after a 12-h lag period, attained a maximal rate at 16 h, and reached a level of 860 pmol thymidine/10(6) nuclei at 24 h (corresponding to replication of approximately 56% total mouse genomic DNA). This DNA synthesis was inhibited approximately 90% by the specific DNA polymerase alpha inhibitor aphidicolin. Deletion of a single cellular component or IL-3 from the system resulted in a marked reduction of DNA replication (-membrane, 80 +/- 4%; -cytosol, 90% +/- 4%; -IL-3, 74 +/- 7% inhibition). This model requires a growth factor (IL-3), a sedimentable cell fraction containing its receptor and possibly additional membrane-associated components, and a cytosolic fraction. It appears to recapitulate the molecular events required for progression from early G1 to S phase of the cell cycle induced by IL-3 binding to its receptor.

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Selected References

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