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Tissue-specific expression of the prostatic acid phosphatase promoter constructs
Jingdong Shan1, Katja Porvari, Anne Kivinen
1Biocenter Oulu and Research Center for Molecular Endocrinology, University of Oulu, P.O. Box 5000, FIN-90014, Oulu, Finland.
Biochemical and Biophysical Research Communications
|November 19, 2003
Summary
Researchers identified key DNA sequences in the human prostatic acid phosphatase (hPAP) gene regulatory region. These findings clarify mechanisms of tissue-specific gene expression in the prostate.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Human prostatic acid phosphatase (hPAP) is highly expressed in prostate epithelial cells post-puberty.
- Understanding hPAP gene regulation is crucial for prostate biology and disease research.
Purpose of the Study:
- To elucidate the mechanisms of tissue-specific gene expression for hPAP.
- To identify regulatory DNA sequences involved in hPAP expression.
Main Methods:
- Analysis of hPAP regulatory regions using transgenic mice and cell line transfections.
- Reporter gene assays (CAT) to assess promoter activity.
- Electrophoretic mobility shift assays (EMSA) to study DNA-binding factors.
Main Results:
- A construct spanning hPAP nucleotides -734 to +467 showed significant prostate-specific expression in transgenic mice.
- Proximal promoter (-734/+50) exhibited low activity across tissues.
- Five homologous sequences (A-E) to a known prostatic DNA-binding site were identified.
- A common nuclear factor binds to the GAAAATATGATA site and sites C and E.
- The intronic region (+57/+467) is important for androgen-activated expression in prostate cells.
Conclusions:
- The identified regulatory regions, particularly the intronic area, are critical for tissue-specific and androgen-dependent hPAP expression.
- Specific DNA-binding factors interacting with these regions play a key role in hPAP gene regulation.