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Insulin effect on proteolytic activities in rat skeletal muscle
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|March 1, 1978
Summary
Proteolytic enzyme activity in rat skeletal muscle significantly rises during starvation and diabetes. Insulin therapy effectively restores this elevated enzyme activity to normal levels.
Area of Science:
- Biochemistry
- Physiology
- Molecular Biology
Background:
- Proteolytic activity plays a crucial role in muscle protein turnover.
- Altered proteolytic activity is implicated in metabolic disorders like diabetes and starvation.
- Understanding these changes is vital for metabolic disease research.
Purpose of the Study:
- To quantify changes in skeletal muscle proteolytic activity in response to starvation and diabetes.
- To investigate the effect of insulin treatment on elevated proteolytic activity in diabetic rats.
Main Methods:
- Measurement of proteolytic activity using [14C]-hemoglobin as a substrate in rat skeletal muscle.
- Induction of diabetes using streptozotocin in experimental animals.
- Monitoring enzyme activity over a 21-day period.
- Assessment of insulin's effect on enzyme activity.
Main Results:
- Proteolytic activity of alkaline proteinases increased significantly in rat skeletal muscle during starvation and diabetic states.
- In streptozotocin-induced diabetic rats, alkaline protease activity elevated by up to 300% within 21 days.
- Insulin treatment successfully reversed the heightened enzyme activity back to normal levels.
Conclusions:
- Starvation and diabetes markedly enhance alkaline protease activity in rat skeletal muscle.
- Insulin therapy is effective in normalizing proteolytic enzyme activity in diabetic conditions.
- These findings highlight the impact of metabolic status on muscle proteolysis and the therapeutic potential of insulin.