Abstract
Ornithine decarboxylase (ODC) mRNA is strongly induced by mitogenic activation of resting Swiss 3T3 fibroblasts and T lymphocytes. Nuclear run-on analysis revealed a low level of nascent transcripts in resting fibroblasts that was elevated upon activation. In contrast, there was a high level of transcription across the entire ODC gene in resting T cells, which remained unchanged upon activation. The stability of the mature ODC message was found to be unaffected by mitogenic stimulation. These results indicate that ODC mRNA levels are regulated transcriptionally in Swiss 3T3 cells and posttranscriptionally within the nucleus of T lymphocytes in response to mitogenic stimuli. In this unique situation, the mitogenic induction of a single gene, ODC, is regulated by two very distinct, cell-specific mechanisms.
MeSH Terms
Animals
Cattle
Cell Division
Cell Nucleus/physiology
Colforsin/pharmacology
Fibroblasts/physiology
Gene Expression Regulation, Enzymologic
In Vitro Techniques
Mice
Ornithine Decarboxylase/genetics
Proto-Oncogene Proteins/genetics
Proto-Oncogene Proteins c-myc
Proto-Oncogenes
RNA, Messenger/genetics
T-Lymphocytes/physiology
Tetradecanoylphorbol Acetate/pharmacology
Transcription, Genetic
Chemicals
Proto-Oncogene Proteins
Proto-Oncogene Proteins c-myc
RNA, Messenger
Colforsin
Ornithine Decarboxylase
Tetradecanoylphorbol Acetate
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Abrahamsen M S
Department of Biochemistry, University of Washington, Seattle 98195.
Morris D R
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