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Regulatory expression of MDP77 protein in the skeletal and cardiac muscles
Kazuhiro E Fujimori1, Atsuko Uyeda, Takahisa Taguchi
1Division for Human Life Technology, National Institute of Advanced Industrial Science and Technology (AIST), Midorigaoka, Ikeda, Osaka 563-8577, Japan. k-fujimori@aist.go.jp
Abstract:
The mdp77 gene was first cloned from the cDNA library of denervated chick muscles, while its role(s) in vivo was unknown. In the present study, using specific polyclonal antibodies against MDP77, we show that MDP77 was expressed specifically in the skeletal and cardiac muscle, and confirm its presence in the cytoplasm of the extrafusal muscle fibers. In mature muscles, MDP77 immunoreactivity was observed in a repetitive manner along the sarcomere. The onset of MDP77 expression occurred just after myotube formation both in vivo and in vitro. Furthermore, MDP77 was enriched in the intrafusal muscle fibers. Our findings suggest that MDP77 plays an important role(s) in the differentiation, maturation and function of both the skeletal and cardiac muscles.
Insights
The mdp77 gene is expressed in skeletal and cardiac muscles, playing a key role in muscle fiber differentiation and maturation. This study reveals MDP77
Area of Science:
- Muscle biology
- Molecular and cellular biology
Background:
- The function of the mdp77 gene in vivo remained largely unknown after its initial cloning from chick muscle cDNA.
- Previous research identified the mdp77 gene but did not elucidate its specific roles in muscle tissue.
Purpose of the Study:
- To investigate the expression patterns and cellular localization of the MDP77 protein in muscle tissues.
- To determine the role of MDP77 in muscle differentiation, maturation, and function.
Main Methods:
- Utilized specific polyclonal antibodies against MDP77 for protein detection.
- Examined MDP77 expression in both skeletal and cardiac muscle tissues.
- Investigated MDP77 expression during myotube formation in vivo and in vitro.
Main Results:
- MDP77 protein expression was confirmed specifically in skeletal and cardiac muscle fibers.
- MDP77 was localized to the cytoplasm of extrafusal muscle fibers and enriched in intrafusal fibers.
- MDP77 immunoreactivity showed a repetitive pattern along the sarcomere in mature muscles.
- MDP77 expression onset was observed shortly after myotube formation.
Conclusions:
- MDP77 is a muscle-specific protein with a defined expression pattern during muscle development.
- The findings strongly suggest MDP77 is crucial for skeletal and cardiac muscle differentiation, maturation, and function.