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Tarasov M, Struckman HL, Olgar Y, Miller A, Demirtas M, Bogdanov V, Terentyeva R, Soltisz AM, Meng X, Min D, Sakuta G, Dunlap I, Duran AD, Foster MP, Davis JP, Terentyev D, Györke S, Veeraraghavan R, Radwański PB. NaV1.6 dysregulation within myocardial T-tubules by D96V calmodulin enhances proarrhythmic sodium and calcium mishandling. J Clin Invest 2023; 133:152071. [PMID: 36821382 PMCID: PMC10065082 DOI: 10.1172/jci152071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 02/14/2023] [Indexed: 02/24/2023] Open
Abstract
Calmodulin (CaM) plays critical roles in cardiomyocytes, regulating Na+ (NaV) and L-type Ca2+ channels (LTCC). LTCC dysregulation by mutant CaMs has been implicated in action potential duration (APD) prolongation and arrhythmogenic long QT (LQT) syndrome. Intriguingly, D96V-CaM prolongs APD more than other LQT-associated CaMs despite inducing comparable levels of LTCC dysfunction, suggesting dysregulation of other depolarizing channels. Here, we provide evidence implicating NaV dysregulation within transverse (T)-tubules in D96V-CaM-associated arrhythmias. D96V-CaM induces pro-arrhythmic late Na+ current (INa) by impairing inactivation of NaV1.6, but not the predominant cardiac NaV isoform, NaV1.5. We investigated arrhythmia mechanisms using mice with cardiac-specific expression of D96V-CaM (cD96V). Super-resolution microscopy revealed close proximity of NaV1.6 and RyR2 within T-tubules. NaV1.6 density within these regions increased in cD96V relative to WT. Consistent with NaV1.6 dysregulation by D96V-CaM in these regions, we observed increased late NaV activity in T-tubules. The resulting late INa promoted aberrant Ca2+ release and prolonged APD in myocytes, leading to LQT and ventricular tachycardia (VT) in vivo. Cardiac-specific NaV1.6 knockout protected cD96V mice from increased T-tubular late NaV activity, and its arrhythmogenic consequences. In summary, we demonstrate that D96V-CaM promotes arrhythmias by dysregulating LTCC and NaV1.6 within T-tubules and thereby, facilitating aberrant Ca2+ release.
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Affiliation(s)
- Mikhail Tarasov
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, United States of America
| | - Heather L Struckman
- The Frick Center for Heart Failure and Arrhythmia, The Ohio State University, Columbus, United States of America
| | - Yusuf Olgar
- The Frick Center for Heart Failure and Arrhythmia, The Ohio State University, Columbus, United States of America
| | - Alec Miller
- The Frick Center for Heart Failure and Arrhythmia, The Ohio State University, Columbus, United States of America
| | - Mustafa Demirtas
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, United States of America
| | - Vladimir Bogdanov
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, United States of America
| | - Radmila Terentyeva
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, United States of America
| | - Andrew M Soltisz
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, United States of America
| | - Xiaolei Meng
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, United States of America
| | - Dennison Min
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, United States of America
| | - Galina Sakuta
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, United States of America
| | - Izabella Dunlap
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, United States of America
| | - Antonia D Duran
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, United States of America
| | - Mark P Foster
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, United States of America
| | - Jonathan P Davis
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, United States of America
| | - Dmitry Terentyev
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, United States of America
| | - Sándor Györke
- The Frick Center for Heart Failure and Arrhythmia, The Ohio State University, Columbus, United States of America
| | - Rengasayee Veeraraghavan
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, United States of America
| | - Przemysław B Radwański
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, United States of America
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Cooper KL, Volk LB, Dominguez DR, Duran AD, Ke Jian Liu KJ, Hudson LG. Contribution of NADPH oxidase to the retention of UVR-induced DNA damage by arsenic. Toxicol Appl Pharmacol 2022; 434:115799. [PMID: 34798142 PMCID: PMC10115133 DOI: 10.1016/j.taap.2021.115799] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 11/10/2021] [Accepted: 11/11/2021] [Indexed: 12/16/2022]
Abstract
Arsenic is a naturally occurring element present in food, soil and water and human exposure is associated with increased cancer risk. Arsenic inhibits DNA repair at low, non-cytotoxic concentrations and amplifies the mutagenic and carcinogenic impact of other DNA-damaging agents, such as ultraviolet radiation (UVR). Arsenic exposure leads to oxidation of zinc coordinating cysteine residues, zinc loss and decreased activity of the DNA repair protein poly(ADP)ribose polymerase (PARP)-1. Because arsenic stimulates NADPH oxidase (NOX) activity leading to generation of reactive oxygen species (ROS), the goal of this study was to investigate the role of NOX in arsenic-induced inhibition of PARP activity and retention of DNA damage. NOX involvement in the arsenic response was assessed in vitro and in vivo. Keratinocytes were treated with or without arsenite, solar-simulated UVR, NOX inhibitors and/or isoform specific NOX siRNA. Knockdown or inhibition of NOX decreased arsenite-induced ROS, PARP-1 oxidation and DNA damage retention, while restoring arsenite inhibition of PARP-1 activity. The NOX2 isoform was determined to be the major contributor to arsenite-induced ROS generation and DNA damage retention. In vivo DNA damage was measured by immunohistochemical staining and analysis of dorsal epidermis sections from C57BI/6 and p91phox knockout (NOX2-/-) mice. There was no significant difference in solar-simulated UVR DNA damage as detected by percent PH2AX positive cells within NOX2-/- mice versus control. In contrast, arsenite-dependent retention of UVR-induced DNA damage was markedly reduced. Altogether, the in vitro and in vivo findings indicate that NOX is involved in arsenic enhancement of UVR-induced DNA damage.
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Affiliation(s)
- Karen L Cooper
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States of America
| | - Lindsay B Volk
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States of America
| | - Dayna R Dominguez
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States of America
| | - Antonia D Duran
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States of America; Department of Chemistry and Biochemistry, Ohio State University, Columbus, OH 43210, United States of America
| | - K J Ke Jian Liu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States of America
| | - Laurie G Hudson
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States of America.
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