Title : Increased erythroid potentiating activity/tissue inhibitor of metalloproteinases and jun/fos transcription factor complex characterize tumor promoter-induced megakaryoblastic differentiation of K562 leukemia cells.

Pub. Date : 1990 May 15

PMID : 2159816






11 Functional Relationships(s)
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1 We have studied the expression of the EPA/TIMP gene at the mRNA and protein levels during 12-O-tetradecanoyl-phorbol-13-acetate (TPA)-induced megakaryoblastic differentiation of K562 human chronic myeloid leukemia cells. Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
2 We have studied the expression of the EPA/TIMP gene at the mRNA and protein levels during 12-O-tetradecanoyl-phorbol-13-acetate (TPA)-induced megakaryoblastic differentiation of K562 human chronic myeloid leukemia cells. Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
3 Northern hybridization analysis showed that the EPA/TIMP mRNA was increased within 3 hours of TPA-induction and reached maximal levels (about 50-fold induction) during the first day of treatment. Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
4 The increase of EPA/TIMP mRNA correlated with increased EPA/TIMP protein biosynthesis and secretion: the TPA-induced cells secreted substantially enhanced amounts of metabolically labeled proteins, of which EPA/TIMP represented up to 50% after the first day of treatment (over 100-fold induction). Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
5 The increase of EPA/TIMP mRNA correlated with increased EPA/TIMP protein biosynthesis and secretion: the TPA-induced cells secreted substantially enhanced amounts of metabolically labeled proteins, of which EPA/TIMP represented up to 50% after the first day of treatment (over 100-fold induction). Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
6 The increase of EPA/TIMP mRNA correlated with increased EPA/TIMP protein biosynthesis and secretion: the TPA-induced cells secreted substantially enhanced amounts of metabolically labeled proteins, of which EPA/TIMP represented up to 50% after the first day of treatment (over 100-fold induction). Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
7 EPA/TIMP induction required continuous protein synthesis, being completely inhibited by addition of the protein synthesis inhibitor cycloheximide simultaneously with TPA, but only partially inhibited in a time-dependent manner if cycloheximide was added after TPA. Cycloheximide TIMP metallopeptidase inhibitor 1 Homo sapiens
8 EPA/TIMP induction required continuous protein synthesis, being completely inhibited by addition of the protein synthesis inhibitor cycloheximide simultaneously with TPA, but only partially inhibited in a time-dependent manner if cycloheximide was added after TPA. Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
9 EPA/TIMP induction required continuous protein synthesis, being completely inhibited by addition of the protein synthesis inhibitor cycloheximide simultaneously with TPA, but only partially inhibited in a time-dependent manner if cycloheximide was added after TPA. Cycloheximide TIMP metallopeptidase inhibitor 1 Homo sapiens
10 EPA/TIMP induction required continuous protein synthesis, being completely inhibited by addition of the protein synthesis inhibitor cycloheximide simultaneously with TPA, but only partially inhibited in a time-dependent manner if cycloheximide was added after TPA. Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens
11 This response was associated with enhanced activity of a transfected recombinant reporter plasmid containing binding sites for the jun/fos transcription factor complex (AP-1) similar to the TPA-responsive element (TRE) sequence we found in the EPA/TIMP gene promoter. Tetradecanoylphorbol Acetate TIMP metallopeptidase inhibitor 1 Homo sapiens