Abstract:
:We examined the relationship of cellular oncogene c-myc and transferrin receptor (TfR) gene expression to cell proliferation and cell cycle progression during myeloid differentiation in the HL-60 myeloid leukemia cell line. In order to determine levels of mRNA for these genes in HL-60 cells induced to differentiate along the myeloid pathway, RNA was isolated from HL-60 cells incubated with retinoic acid for 24 h and Northern blots were probed with labeled cDNAs for c-myc and TfR. c-myc mRNA decreased within 3 h of retinoic acid addition, and TfR mRNA decreased after 9 h; both mRNAs continued to decrease over 24 h. RNA was also isolated from HL-60 cells separated by centrifugal elutriation into cell cycle phases. TfR and c-myc cDNA probes hybridized equally to RNA from uninduced cells in all phases of the cell cycle. However, after 24 h incubation with the differentiation inducer retinoic acid, TfR mRNA was expressed substantially less in the G1 stage, whereas c-myc mRNA was still expressed equally in all cell cycle phases. These data indicate that, although TfR and c-myc expression are both associated with cell proliferation in the HL-60 line, TfR is down-regulated specifically in G1 upon induction of terminal differentiation whereas c-myc expression is disassociated from cell cycle control in these cells.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Barker KA,Newburger PEdoi
10.1016/0014-4827(90)90202-lsubject
Has Abstractpub_date
1990-01-01 00:00:00pages
1-5issue
1eissn
0014-4827issn
1090-2422pii
0014-4827(90)90202-Ljournal_volume
186pub_type
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