Journal
ONCOGENE
Volume 25, Issue 23, Pages 3296-3306Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1209363
Keywords
DEC1; survivin; Sp1 element; transcription activation
Funding
- NCCIH NIH HHS [F05AT003019, F05 AT003019] Funding Source: Medline
- NIEHS NIH HHS [R01 ES007965, R01ES07965] Funding Source: Medline
- NIGMS NIH HHS [R01 GM061988, R01GM61988] Funding Source: Medline
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Human differentially expressed in chondrocytes (DEC), mouse stimulated with retinoic acid and rat split and hairy related proteins constitute a structurally distinct class of the basic helix-loop-helix proteins. DEC1 is abundantly expressed in tumors and protects against apoptosis induced by serum starvation. In this study, we report that DEC1 antiapoptosis is achieved by inducing survivin, an antiapoptotic protein. In paired tumor-normal tissues, survivin and DEC1 exhibited a paralleled expression pattern. Tetracycline-induced expression of DEC1 in stable lines proportionally increased the expression of survivin. In reporter assays, DEC1 trans activated the survivin promoter but repressed the DEC2 promoter. In contrast to the repression, the activation was delayed and varied depending on serum concentrations and cycle blockers. Studies with reporter mutants located, in the survivin promoter, two Sp1 sites that supported DEC1 transactivation. Electrophoretic mobility shift assay and chromatin immunoprecipitation detected the presence of DEC1 in the survivin promoter. These findings establish that the survivin gene is a transcription target of DEC1, and induction of survivin is at least in part responsible for DEC1 antiapoptosis.
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