PMID- 9831070 OWN - NLM STAT- MEDLINE DCOM- 19990113 LR - 20211203 IS - 0730-2312 (Print) IS - 0730-2312 (Linking) VI - 71 IP - 3 DP - 1998 Dec 1 TI - Insulin-regulated protein kinases during postnatal development of rat heart. PG - 328-39 AB - The control of glucose uptake and glycogen metabolism by insulin in target organs is in part mediated through the regulation of protein-serine/threonine kinases. In this study, the expression and phosphotransferase activity levels of some of these kinases in rat heart ventricle were measured to investigate whether they might mediate the shift in the energy dependency of the developing heart from glycogen to fatty acids. Following tail-vein injection of overnight fasted adult rats with 2 U of insulin per kg body weight, protein kinase B (PKB), the 70-kDa ribosomal S6 kinase (S6K), and casein kinase 2 (CK2) were activated (30-600%), whereas the MAP/extracellular regulated kinases (ERK)1 and ERK2 were not stimulated under these conditions. When the expression levels of the insulin-activated kinases were probed with specific antibodies in ventricular extracts from 1-, 10-, 20-, 50-, and 365-day-old rats, phosphatidylinositol 3-kinase (PI3K), PKB, S6K, and CK2 were downregulated (40-60%) with age. By contrast, ventricular glycogen synthase kinase-3beta (GSK3beta) protein levels were maintained during postnatal development. Similar findings were obtained when the expression of these kinases was investigated in freshly isolated ventricular myocytes, where they were detected predominantly in the cytosolic fraction of the myocytes. Compared to other adult rat tissues such as brain and liver, the levels of PI3K, PKB, S6K, and GSK3beta were relatively low in the heart. Even though CK2 protein and activity levels were reduced by approximately 60% in 365 day as compared to 1-day-old rats, expression of CK2 in the adult heart was as high as detected in any of the other rat tissues. The high basal activities of CK2 in early neonatal heart may be associated with the proliferating state of myocytes. FAU - Kim, S O AU - Kim SO AD - Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada. FAU - Hasham, M I AU - Hasham MI FAU - Katz, S AU - Katz S FAU - Pelech, S L AU - Pelech SL LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Cell Biochem JT - Journal of cellular biochemistry JID - 8205768 RN - 0 (Insulin) RN - 0 (Proto-Oncogene Proteins) RN - EC 2.7.- (Protein Kinases) RN - EC 2.7.11.- (Glycogen Synthase Kinases) RN - EC 2.7.11.1 (Casein Kinase II) RN - EC 2.7.11.1 (Protein Serine-Threonine Kinases) RN - EC 2.7.11.1 (Proto-Oncogene Proteins c-akt) RN - EC 2.7.11.1 (Ribosomal Protein S6 Kinases) RN - EC 2.7.11.17 (Calcium-Calmodulin-Dependent Protein Kinases) RN - EC 2.7.11.26 (Glycogen Synthase Kinase 3) SB - IM MH - Amino Acid Sequence MH - Animals MH - Blotting, Western MH - Calcium-Calmodulin-Dependent Protein Kinases/metabolism MH - Casein Kinase II MH - Glycogen Synthase Kinase 3 MH - Glycogen Synthase Kinases MH - Heart/drug effects/growth & development MH - Heart Ventricles MH - Insulin/*pharmacology MH - Male MH - Molecular Sequence Data MH - Molecular Weight MH - Myocardium/*enzymology MH - Phosphatidylinositol 3-Kinases/metabolism MH - Phosphorylation MH - Protein Kinases/*metabolism MH - Protein Serine-Threonine Kinases/metabolism MH - Proto-Oncogene Proteins/metabolism MH - Proto-Oncogene Proteins c-akt MH - Rats MH - Rats, Sprague-Dawley MH - Ribosomal Protein S6 Kinases/metabolism EDAT- 1998/11/27 03:02 MHDA- 2000/06/20 09:00 CRDT- 1998/11/27 03:02 PHST- 1998/11/27 03:02 [pubmed] PHST- 2000/06/20 09:00 [medline] PHST- 1998/11/27 03:02 [entrez] AID - 10.1002/(SICI)1097-4644(19981201)71:3<328::AID-JCB2>3.0.CO;2-U [pii] AID - 10.1002/(sici)1097-4644(19981201)71:3<328::aid-jcb2>3.0.co;2-u [doi] PST - ppublish SO - J Cell Biochem. 1998 Dec 1;71(3):328-39. doi: 10.1002/(sici)1097-4644(19981201)71:3<328::aid-jcb2>3.0.co;2-u.