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OAZ regulates bone morphogenetic protein signaling through Smad6 activation
Manching Ku1, Shavonne Howard, Weihua Ni
1Molecular Cardiology Research Institute, Tufts-New England Medical Center, Boston, MA 02111, USA.
The Journal of Biological Chemistry
|December 24, 2005
Summary
The transcriptional activator OAZ regulates bone morphogenetic protein (BMP) signaling by controlling the duration and intensity of cellular responses. OAZ influences Smad6 induction, a BMP pathway inhibitor, impacting cell-specific reactions to BMP stimulation.
Area of Science:
- Molecular Biology
- Cell Signaling
- Developmental Biology
Background:
- Signal transduction dynamics dictate cellular response specificity.
- Mechanisms underlying cell-specific variations in cytokine signaling intensity and duration remain unclear.
Purpose of the Study:
- Investigate the role of OAZ (OAZ) as a transcriptional activator and Smad1/4 cofactor in regulating bone morphogenetic protein (BMP) signaling.
- Determine how OAZ influences the intensity and duration of BMP signaling pathways.
Main Methods:
- Studied the interaction of OAZ-Smad1/4 complexes with the Smad6 gene promoter upon BMP4 stimulation.
- Utilized OAZ-deficient and OAZ-overexpressing cell lines (embryonal carcinoma cells, myoblasts, smooth muscle cells).
- Assessed Smad6 gene induction and Smad1 phosphorylation levels in response to BMP4.
Main Results:
- OAZ-Smad1/4 complex binding to the Smad6 promoter activates Smad6 gene expression upon BMP4 stimulation.
- OAZ depletion in embryonal carcinoma cells abrogated BMP4-induced Smad6 expression and prolonged Smad1 phosphorylation.
- Forced OAZ expression in myoblasts and smooth muscle cells accelerated Smad6 induction, reduced Smad1 phosphorylation, and attenuated BMP-mediated responses.
Conclusions:
- OAZ acts as a critical regulator of BMP signaling intensity and duration by modulating Smad6 induction.
- Tissue-specific expression of OAZ is a key determinant of cellular responsiveness to BMP signals.
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