title: Inhibition of CaMKII does not attenuate cardiac hypertrophy in mice with dysfunctional ryanodine receptor.
abstract: In cardiac muscle, the release of calcium ions from the sarcoplasmic reticulum through ryanodine receptor ion channels (RyR2s) leads to muscle contraction. RyR2 is negatively regulated by calmodulin (CaM) and by phosphorylation of Ca2+/CaM-dependent protein kinase II (CaMKII). Substitution of three amino acid residues in the CaM binding domain of RyR2 (RyR2-W3587A/L3591D/F3603A, RyR2ADA) impairs inhibition of RyR2 by CaM and results in cardiac hypertrophy and early death of mice carrying the RyR2ADA mutation. To test the cellular function of CaMKII in cardiac hypertrophy, mutant mice were crossed with mice expressing the CaMKII inhibitory AC3-I peptide or the control AC3-C peptide in the myocardium. Inhibition of CaMKII by AC3-I modestly reduced CaMKII-dependent phosphorylation of RyR2 at Ser-2815 and markedly reduced CaMKII-dependent phosphorylation of SERCA2a regulatory subunit phospholamban at Thr-17. However the average life span and heart-to-body weight ratio of Ryr2ADA/ADA mice expressing the inhibitory peptide were not altered compared to control mice. In Ryr2ADA/ADA homozygous mice, AC3-I did not alter cardiac morphology, enhance cardiac function, improve sarcoplasmic reticulum Ca2+ handling, or suppress the expression of genes implicated in cardiac remodeling. The results suggest that CaMKII was not required for the rapid development of cardiac hypertrophy in Ryr2ADA/ADA mice.
authors.affiliation: Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC, United States of America.
authors.forename: Asima
authors.initials: A
authors.lastname: Chakraborty
authors.affiliation: Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC, United States of America.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Pasek
authors.affiliation: Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC, United States of America.
authors.forename: Tai-Qin
authors.initials: TQ
authors.lastname: Huang
authors.affiliation: Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, United States of America.
authors.forename: Angela C
authors.initials: AC
authors.lastname: Gomez
authors.affiliation: Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, United States of America.
authors.forename: Naohiro
authors.initials: N
authors.lastname: Yamaguchi
authors.affiliation: Division of Cardiovascular Medicine, Departments of Internal Medicine, and Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, United States of America.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Anderson
authors.affiliation: Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC, United States of America.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Meissner
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2 / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006332:Cardiomegaly / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism* / Q000401:mortality; D004195:Disease Models, Animal; D004452:Echocardiography; D015870:Gene Expression; D051379:Mice; D008822:Mice, Transgenic; D009154:Mutation; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D010446:Peptide Fragments / Q000494:pharmacology; D010766:Phosphorylation; D011493:Protein Kinase C / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D019837:Ryanodine Receptor Calcium Release Channel / Q000378:metabolism*
chemical_list: D010446:Peptide Fragments; D012333:RNA, Messenger; D019837:Ryanodine Receptor Calcium Release Channel; C089212:protein kinase D; D011493:Protein Kinase C; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D002118:Calcium
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