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Carbonic anhydrase activity in mammalian skeletal and cardiac muscle
The Biochemical Journal
|December 15, 1977
Insights
Extravascular carbonic anhydrase activity was found in rat skeletal muscle but not in cardiac muscle. This skeletal muscle activity correlates with the proportion of dark muscle fibers.
Area of Science:
- Physiology
- Biochemistry
Background:
- Carbonic anhydrase (CA) is a crucial enzyme in physiological processes.
- Understanding CA distribution in different muscle types is important for metabolic studies.
Purpose of the Study:
- To investigate the presence and location of carbonic anhydrase activity in rat cardiac and skeletal muscles.
- To determine the relationship between carbonic anhydrase activity and muscle fiber type in skeletal muscle.
Main Methods:
- Enzyme assays were performed on tissue homogenates from rat cardiac and skeletal muscles.
- Histochemical staining was used to identify carbonic anhydrase activity within muscle fibers.
- Muscle fiber typing was conducted on skeletal muscle samples.
Main Results:
- Significant extravascular carbonic anhydrase activity was detected in rat skeletal muscle.
- No significant carbonic anhydrase activity was found in rat cardiac muscle.
- Skeletal muscle carbonic anhydrase activity showed a positive correlation with the proportion of dark muscle fibers.
Conclusions:
- Rat skeletal muscle possesses extravascular carbonic anhydrase activity, unlike cardiac muscle.
- The distribution of carbonic anhydrase in skeletal muscle is associated with specific muscle fiber types, particularly dark fibers.
Abstract:
1. The presence of extravascular carbonic anhydrase activity in skeletal muscle, and its absence from cardiac muscle, were demonstrated in the rat. 2. The activity in skeletal muscle is approximately correlated with the proportion of dark fibres present in the middle fibre bundles.