Abstract:
:We have studied the transcriptional activity, steady-state mRNA levels, and steady-state protein levels of the c-myc and transferrin receptor (TfR) genes in murine M1 myeloid leukemia cells arrested in G1 phase of the cell cycle by different methods. When cells are growth-arrested by density inhibition, a technique that places the majority of cells in early G1, c-myc protein, as detected by Western analysis, is expressed at 80% of the level seen in proliferating cells. Steady-state mRNA levels and, to a lesser extent, transcriptional activity of the c-myc gene, parallel the protein findings. Under these conditions, TfR gene expression is much lower than in normally cycling cells. We have previously demonstrated that density-inhibited M1 cells, released from density inhibition and treated with the DNA polymerase alpha inhibitor aphidicolin, remain in G1, but at a point temporally closer to S phase. Cells treated in this manner demonstrate reduced transcriptional activity and expression of the c-myc gene, but TfR gene expression approximates the level found in proliferating cells. These data suggest that neither c-myc nor TfR gene expression is constant throughout the G1 phase of the cell cycle in M1 cells. c-myc gene expression is highest in early G1 and falls to low levels by late G1, while the reverse is true for TfR gene expression.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Neckers LM,Tsuda H,Weiss E,Pluznik DHdoi
10.1002/jcp.1041350223subject
Has Abstractpub_date
1988-05-01 00:00:00pages
339-44issue
2eissn
0021-9541issn
1097-4652journal_volume
135pub_type
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