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Creatine kinase isozyme expression in prenatal rat heart
H D Hasselbaink1, W T Labruyère, A F Moorman
1Department of Anatomy and Embryology, University of Amsterdam, The Netherlands.
Anatomy and Embryology
|January 1, 1990
Summary
Creatine kinase M (CK-M) and B (CK-B) isozymes show distinct prenatal distribution patterns in rat hearts. CK-M expression becomes homogeneous by embryonic day 18, while CK-B decreases regionally after embryonic day 14.
Area of Science:
- Developmental Biology
- Biochemistry
- Cardiovascular Physiology
Background:
- Creatine kinase (CK) isozymes are crucial for cellular energy homeostasis.
- Understanding the spatiotemporal expression of CK isozymes during cardiac development is essential for insights into heart physiology.
Purpose of the Study:
- To investigate the distribution patterns of creatine kinase M (CK-M) and creatine kinase B (CK-B) isozymes in prenatal rat heart and skeletal muscle.
- To correlate these patterns with cardiac development stages.
Main Methods:
- Immunohistochemistry was employed to visualize CK-M and CK-B distribution.
- Studies were conducted on prenatal rat hearts from embryonic day 11 to birth.
Main Results:
- CK-M exhibited heterogeneous expression in the prenatal heart, becoming homogeneous by embryonic day 18.
- CK-B showed homogeneous expression early on, followed by regional decreases, with some remaining in ventricular walls at birth.
- Observed patterns in rat hearts share similarities with other mammalian and avian species.
Conclusions:
- Prenatal rat heart development is characterized by distinct, stage-dependent regional expression of CK-M and CK-B isozymes.
- The functional significance of these dynamic isozyme distribution changes for cardiac physiology remains an area for further investigation.