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Developmental changes in adenylate cyclase activity in canine myocardium
Developmental Pharmacology and Therapeutics
|January 1, 1984
Summary
Adenylate cyclase activity in dog hearts increases from birth to adulthood. Changes in guanine nucleotide regulatory protein characteristics may explain developmental alterations in this enzyme activity.
Area of Science:
- Cardiovascular Physiology
- Biochemistry
- Developmental Biology
Background:
- Adenylate cyclase activity is crucial for cardiac function.
- Understanding developmental changes in cardiac enzyme activity is important for pediatric cardiology.
Purpose of the Study:
- To investigate age-related changes in dog myocardial adenylate cyclase activity.
- To explore the role of regulatory proteins in these developmental alterations.
Main Methods:
- Assessed basal, epinephrine-stimulated, and fluoride-stimulated adenylate cyclase activity in dog heart homogenates across different ages.
- Measured 5'-guanylyl imidodiphosphate [Gpp(NH)p]-stimulated activity to assess guanine nucleotide regulatory protein function.
Main Results:
- Adenylate cyclase activity increased significantly from birth to adulthood, stabilizing thereafter.
- Epinephrine's stimulatory effect increased only in the first week post-birth.
- Fluoride-stimulated activity rose, while Gpp(NH)p-stimulated activity declined during development, suggesting altered guanine nucleotide regulatory protein characteristics.
Conclusions:
- Developmental changes in myocardial adenylate cyclase activity are significant.
- Altered guanine nucleotide regulatory protein function likely contributes to these age-related changes in enzyme activity.