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Heterogeneous PrPC metabolism in skeletal muscle cells
Maria Lina Massimino1, Jessica Ferrari, Maria Catia Sorgato
1Department of Biological Chemistry, University of Padova, viale G. Colombo 3, 35121 Padova, Italy.
Abstract:
Recent reports have shown that prions, the causative agent of transmissible spongiform encephalopathies, accumulate in the skeletal muscle of diseased animals and man. In an attempt to characterise in this tissue the prion protein (PrP(C)), whose conformational rearrangement governs the generation of prions, we have analysed the protein in primary cultured murine myocytes and in different skeletal muscle types. Our results indicate that the expression and cellular processing of PrP(C) change during myogenesis, and in muscle fibres with different contractile properties. These findings imply a potential role for PrP(C) in the skeletal muscle physiology, but may also explain the different capability of muscles to sustain prion replication.
Insights
Prion protein (PrP(C)) expression and processing in skeletal muscle change during development and vary by muscle type. This suggests a role in muscle physiology and prion replication capability.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Prions, the agents of transmissible spongiform encephalopathies, are increasingly found in skeletal muscle.
- The prion protein (PrP(C)) undergoes conformational changes crucial for prion generation.
Purpose of the Study:
- To characterize PrP(C) expression and processing in murine myocytes and diverse skeletal muscle types.
- To investigate the relationship between PrP(C) and skeletal muscle physiology.
Main Methods:
- Primary culture of murine myocytes.
- Analysis of PrP(C) in different skeletal muscle fiber types.
Main Results:
- PrP(C) expression and cellular processing are dynamic during myogenesis.
- Variations in PrP(C) processing correlate with muscle fiber contractile properties.
Conclusions:
- PrP(C) likely plays a role in skeletal muscle physiology.
- Muscle-specific differences in PrP(C) processing may influence prion replication susceptibility.
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