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A novel cell-based system for evaluating skeletal muscle cell hypertrophy-inducing agents
Doreen Cross-Doersen1, Robert J Isfort
1Research Division, Procter & Gamble Pharmaceuticals, Health Care Research Center, 8700 Mason-Montgomery Road, Mason, Ohio 45040-9317, USA.
In Vitro Cellular & Developmental Biology. Animal
|January 27, 2004
Summary
Researchers developed a novel cell system to study skeletal muscle hypertrophy, or muscle growth. This system aids in discovering new treatments for age-related muscle loss (sarcopenia) and understanding muscle growth pathways.
Area of Science:
- Biochemistry
- Cell Biology
- Physiology
Background:
- Skeletal muscle mass increases with contractile protein gene expression, a process known as hypertrophy.
- Age-related muscle loss, or sarcopenia, presents a significant health challenge.
- Understanding hypertrophy signaling pathways is crucial for developing therapeutic interventions.
Purpose of the Study:
- To create a skeletal muscle cell-based system for identifying hypertrophy-inducing agents.
- To investigate signaling pathways involved in skeletal muscle hypertrophy.
- To find potential treatments for sarcopenia.
Main Methods:
- Developed a modified C2C12 cell line containing a beta-myosin heavy chain (beta-MHC) promoter fused to a luciferase reporter gene.
- Utilized this cell line to measure responses to various hypertrophy-inducing agents.
- Assessed responses in both undifferentiated and differentiated cellular states.
Main Results:
- The modified C2C12 cell line exhibited increased luciferase expression in response to hypertrophy-inducing agents.
- Agents tested included insulin, insulin-like growth factor I, testosterone, and isoproterenol.
- The system demonstrated responsiveness in both undifferentiated and differentiated C2C12 cells.
Conclusions:
- The developed cell-based system is effective for identifying novel skeletal muscle hypertrophy-inducing agents.
- This system provides a valuable tool for elucidating hypertrophy signal transduction pathways.
- The findings contribute to the potential development of therapies for sarcopenia and muscle wasting conditions.