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Regulation of alpha7 integrin expression during muscle differentiation
Jianqiao Xiao1, Poonam Jethanandani, Barry L Ziober
1Departments of Stomatology and Anatomy, University of California at San Francisco, San Francisco, California 94143-0422, USA.
The Journal of Biological Chemistry
|October 4, 2003
Summary
The c-Myc transcription factor suppresses alpha7 integrin gene expression during muscle development. This regulation is crucial for controlling alpha7 integrin levels in developing muscle and forming myotendinous junctions.
Area of Science:
- Molecular Biology
- Cell Biology
- Developmental Biology
Background:
- Integrins, like alpha7 integrin, are vital for muscle development and function.
- The precise regulation of alpha7 integrin during muscle differentiation remains unclear.
Purpose of the Study:
- To investigate the regulatory mechanisms controlling alpha7 integrin gene expression during myogenic differentiation.
- To identify the role of the c-Myc transcription factor in alpha7 integrin regulation.
Main Methods:
- Quantitative analysis of alpha7 integrin mRNA and protein levels.
- Gene transfection studies using c-Myc and dominant-negative c-Myc (Madmyc).
- Promoter deletion analysis and DNA-protein binding assays.
Main Results:
- Alpha7 integrin expression increases during myogenesis, inversely correlating with c-Myc levels.
- c-Myc transfection down-regulates alpha7 integrin expression.
- A specific double E-box in the alpha7 promoter mediates c-Myc-dependent repression.
Conclusions:
- c-Myc acts as a repressor of alpha7 integrin gene expression during muscle differentiation.
- The c-Myc/E-box interaction is a key regulatory element for alpha7 integrin in muscle development.
- This finding provides insight into the formation of myotendinous junctions.