Phosphodiesterase 5 Inhibition Limits Doxorubicin-induced Heart Failure by Attenuating Protein Kinase G Iα Oxidation
| Autor: | David A. Kass, Oleksandra Prysyazhna, Jenna Scotcher, Steven P. Grover, Joseph R. Burgoyne, Philip Eaton |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty RHOA Cardiomegaly 030204 cardiovascular system & hematology Second Messenger Systems Biochemistry Tadalafil Mice 03 medical and health sciences 0302 clinical medicine Internal medicine medicine Animals Doxorubicin Disulfides Protein kinase A Cyclic GMP Molecular Biology Cyclic GMP-Dependent Protein Kinase Type I Cyclic Nucleotide Phosphodiesterases Type 5 Heart Failure rho-Associated Kinases CGMP binding biology Chemistry Kinase Phosphodiesterase Molecular Bases of Disease Cell Biology Phosphodiesterase 5 Inhibitors Mice Mutant Strains 030104 developmental biology Endocrinology cGMP-specific phosphodiesterase type 5 cardiovascular system biology.protein Oxidation-Reduction cGMP-dependent protein kinase medicine.drug |
| Zdroj: | Prysyazhna, O, Burgoyne, J R, Scotcher, J, Grover, S, Kass, D & Eaton, P 2016, ' Phosphodiesterase 5 Inhibition Limits Doxorubicin-induced Heart Failure by Attenuating Protein Kinase G Iα Oxidation ', Journal of Biological Chemistry, vol. 291, no. 33, pp. 17427-17436 . https://doi.org/10.1074/jbc.M116.724070 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m116.724070 |
| Popis: | Phosphodiesterase 5 (PDE5) inhibitors limit myocardial injury caused by stresses, including doxorubicin chemotherapy. cGMP binding to PKG Iα attenuates oxidant-induced disulfide formation. Because PDE5 inhibition elevates cGMP and protects from doxorubicin-induced injury, we reasoned that this may be because it limits PKG Iα disulfide formation. To investigate the role of PKG Iα disulfide dimerization in the development of apoptosis, doxorubicin-induced cardiomyopathy was compared in male wild type (WT) or disulfide-resistant C42S PKG Iα knock-in (KI) mice. Echocardiography showed that doxorubicin treatment caused loss of myocardial tissue and depressed left ventricular function in WT mice. Doxorubicin also reduced pro-survival signaling and increased apoptosis in WT hearts. In contrast, KI mice were markedly resistant to the dysfunction induced by doxorubicin in WTs. In follow-on experiments the influence of the PDE5 inhibitor tadalafil on the development of doxorubicin-induced cardiomyopathy in WT and KI mice was investigated. In WT mice, co-administration of tadalafil with doxorubicin reduced PKG Iα oxidation caused by doxorubicin and also protected against cardiac injury and loss of function. KI mice were again innately resistant to doxorubicin-induced cardiotoxicity, and therefore tadalafil afforded no additional protection. Doxorubicin decreased phosphorylation of RhoA (Ser-188), stimulating its GTPase activity to activate Rho-associated protein kinase (ROCK) in WTs. These pro-apoptotic events were absent in KI mice and were attenuated in WTs co-administered tadalafil. PKG Iα disulfide formation triggers cardiac injury, and this initiation of maladaptive signaling can be blocked by pharmacological therapies that elevate cGMP, which binds kinase to limit its oxidation. |
| Databáze: | OpenAIRE |
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