title: Independent expression of cardiac type I and II cyclic AMP-dependent protein kinase during murine embryogenesis and postnatal development.
abstract: The amount of total cyclic AMP-dependent protein kinase and of the protein kinase isozymes present in mouse heart changes during development. During embryogenesis, the total cardiac protein kinase activity increases most markedly during the 6 days prior to birth. A maximum kinase level is achieved in the 7 day-old neonate, and then activity progressively declines to an adult level approximating that of the mid-embryo. The type II kinase exhibits a moderate increase during late embryogenesis which declines by the time of birth. The type I isozyme increases throughout embryogenesis and the first neonatal week to a maximum specific activity five-fold higher than the mid-embryogenesis level. The isozyme level then falls to an adult activity similar to the mid-embryonic. These changes in isozyme profile are reflected in a changing type I to type II kinase ratio of 1.1 at 13--14 days embryogenesis, 2.4 at birth, 3.0 in the 7 day-old neonates, and 1 in the adult heart. Thus, the two protein kinase isozymes change in association with the developmental process in an independent fashion.
mesh_terms: D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D000242:Cyclic AMP / Q000378:metabolism*; D005260:Female; D005865:Gestational Age; D006321:Heart / Q000196:embryology*; D006801:Humans; D007231:Infant, Newborn; D007527:Isoenzymes; D008297:Male; D051379:Mice; D009206:Myocardium / Q000201:enzymology*; D011247:Pregnancy; D011494:Protein Kinases / Q000378:metabolism* / Q000502:physiology
chemical_list: D007527:Isoenzymes; D000242:Cyclic AMP; D011494:Protein Kinases