Key result
Connectin content in bovine cardiac myofibrils was approximately 18% of total myofibrillar protein, three times the amount found in skeletal myofibrils.
Population
Bovine heart myofibrils and skeletal muscle myofibrils
Comparison
Protein analysis of connectin content vs Skeletal muscle myofibrils
Design
Preclinical
Authors
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Cardiac myofibrils contain threefold more connectin than skeletal; leaves open its role in human myocardial elasticity.
Absolute Event Rate: 18% vs 6%
The high connectin content in cardiac myofibrils may be responsible for keeping myofibrils short at rest and facilitating tension generation during passive stretching (Starling's law).
Maruyama et al. (1977) studied this question. Bovine cardiac myofibrils vs. Skeletal myofibrils was evaluated on Connectin content as a percentage of total myofibrillar protein. Connectin content in bovine cardiac myofibrils was approximately 18% of total myofibrillar protein, three times the amount found in skeletal myofibrils.
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