Title : Inhibition of phorbol ester-induced monocytic differentiation by dexamethasone is associated with down-regulation of c-fos and c-jun (AP-1).

Pub. Date : 1991 Oct

PMID : 1939341






11 Functional Relationships(s)
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1 Previous studies have shown that treatment of human myeloid leukemia cells with 12-O-tetradecanoylphorbol-13-acetate (TPA) is associated with induction of monocytic differentiation and expression of the c-jun and c-fos early response genes. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
2 Previous studies have shown that treatment of human myeloid leukemia cells with 12-O-tetradecanoylphorbol-13-acetate (TPA) is associated with induction of monocytic differentiation and expression of the c-jun and c-fos early response genes. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
3 The present work demonstrates that the glucocorticoid dexamethasone inhibits TPA-induced increases in c-jun and c-fos mRNA levels in U-937 leukemia cells. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
4 Other studies have demonstrated that TPA-induced monocytic differentiation and expression of the c-jun and c-fos genes in myeloid leukemia cells are regulated by protein kinase C (PKC). Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
5 Nuclear run-on assays demonstrate that: (1) induction of c-jun and c-fos expression by TPA is regulated by transcriptional mechanisms, (2) TPA-induced expression of c-jun and c-fos does not require protein synthesis, and (3) TPA-induced expression of both genes is inhibited at the transcriptional level by dexamethasone. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
6 Nuclear run-on assays demonstrate that: (1) induction of c-jun and c-fos expression by TPA is regulated by transcriptional mechanisms, (2) TPA-induced expression of c-jun and c-fos does not require protein synthesis, and (3) TPA-induced expression of both genes is inhibited at the transcriptional level by dexamethasone. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
7 Nuclear run-on assays demonstrate that: (1) induction of c-jun and c-fos expression by TPA is regulated by transcriptional mechanisms, (2) TPA-induced expression of c-jun and c-fos does not require protein synthesis, and (3) TPA-induced expression of both genes is inhibited at the transcriptional level by dexamethasone. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
8 Nuclear run-on assays demonstrate that: (1) induction of c-jun and c-fos expression by TPA is regulated by transcriptional mechanisms, (2) TPA-induced expression of c-jun and c-fos does not require protein synthesis, and (3) TPA-induced expression of both genes is inhibited at the transcriptional level by dexamethasone. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
9 Nuclear run-on assays demonstrate that: (1) induction of c-jun and c-fos expression by TPA is regulated by transcriptional mechanisms, (2) TPA-induced expression of c-jun and c-fos does not require protein synthesis, and (3) TPA-induced expression of both genes is inhibited at the transcriptional level by dexamethasone. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
10 Nuclear run-on assays demonstrate that: (1) induction of c-jun and c-fos expression by TPA is regulated by transcriptional mechanisms, (2) TPA-induced expression of c-jun and c-fos does not require protein synthesis, and (3) TPA-induced expression of both genes is inhibited at the transcriptional level by dexamethasone. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens
11 These findings suggest that dexamethasone down-regulates TPA-induced transcription of the c-jun gene during monocytic differentiation by inhibiting activation of the AP-1 site. Tetradecanoylphorbol Acetate Jun proto-oncogene, AP-1 transcription factor subunit Homo sapiens