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Protein kinase C (calcium/phospholipid-dependent protein kinase) in developing chick heart: selective localization to
R W Wrenn1, M A Barrow, M E Redmond
1Department of Anatomy, School of Medicine, Medical College of Georgia, Augusta 30912.
Insights
Protein kinase C activity is higher in embryonic chick atria than ventricles, increasing during development and decreasing after hatching. This suggests protein kinase C may regulate heart development.
Area of Science:
- Developmental biology
- Molecular biology
- Cardiovascular research
Background:
- Protein kinases play crucial roles in cellular signaling pathways.
- Understanding the developmental regulation of protein kinases is essential for comprehending heart development.
Purpose of the Study:
- To investigate the activity levels of calcium/phospholipid-dependent protein kinase (protein kinase C) and cyclic AMP-dependent protein kinase (protein kinase A) in embryonic chick atria and ventricles.
- To explore the potential role of protein kinase C in cardiogenesis.
Main Methods:
- Enzyme activity assays were performed on atrial and ventricular preparations from embryonic chick hearts at various developmental stages.
- Comparative analysis of protein kinase C and protein kinase A activity between atria and ventricles throughout development.
Main Results:
- Protein kinase C activity was significantly higher in atria compared to ventricles.
- Atrial protein kinase C activity progressively increased during cardiogenesis, peaking before hatching, and then sharply declined post-hatching.
- Protein kinase A activity, while also higher in atria, remained relatively stable during development before decreasing after hatching.
Conclusions:
- Progressive changes in atrial protein kinase C activity during cardiogenesis suggest a regulatory role in heart development.
- Differential expression and activity patterns of protein kinases may be critical for proper cardiac development and function.
Abstract:
Activity levels of calcium/phospholipid-dependent protein kinase were examined in preparations of atria and ventricles from embryonic chick hearts at various stages of development. Activity of protein kinase C was much higher in atria than ventricles. Protein kinase C activity underwent a progressive increase in atria during cardiogenesis, being highest just prior to hatching, followed by a profound decrease in activity after hatching. In contrast, activity of cyclic AMP-dependent protein kinase (protein kinase A), while also higher in atria than ventricles, remained relatively constant at the developmental stages examined, likewise decreasing following hatching. These progressive changes in atrial protein kinase C activity suggest a potential regulatory role for this enzyme in cardiogenesis.