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Soltisz AM, Craigmile PF, Veeraraghavan R. Spatial Pattern Analysis using Closest Events (SPACE)-A Nearest Neighbor Point Pattern Analysis Framework for Assessing Spatial Relationships from Digital Images. Microsc Microanal 2024; 30:306-317. [PMID: 38498601 DOI: 10.1093/mam/ozae022] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 12/06/2023] [Accepted: 02/26/2024] [Indexed: 03/20/2024]
Abstract
The quantitative description of biological structures is a valuable yet difficult task in the life sciences. This is commonly accomplished by imaging samples using fluorescence microscopy and analyzing resulting images using Pearson's correlation or Manders' co-occurrence intensity-based colocalization paradigms. Though conceptually and computationally simple, these approaches are critically flawed due to their reliance on signal overlap, sensitivity to cursory signal qualities, and inability to differentiate true and incidental colocalization. Point pattern analysis provides a framework for quantitative characterization of spatial relationships between spatial patterns using the distances between observations rather than their overlap, thus overcoming these issues. Here we introduce an image analysis tool called Spatial Pattern Analysis using Closest Events (SPACE) that leverages nearest neighbor-based point pattern analysis to characterize the spatial relationship of fluorescence microscopy signals from image data. The utility of SPACE is demonstrated by assessing the spatial association between mRNA and cell nuclei from confocal images of cardiac myocytes. Additionally, we use synthetic and empirical images to characterize the sensitivity of SPACE to image segmentation parameters and cursory image qualities such as signal abundance and image resolution. Ultimately, SPACE delivers performance superior to traditional colocalization methods and offers a valuable addition to the microscopist's toolbox.
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Affiliation(s)
- Andrew M Soltisz
- Department of Biomedical Engineering, College of Engineering, 2124 Fontana Labs,140 W. 19th Ave, The Ohio State University, Columbus, OH 43210, USA
| | - Peter F Craigmile
- Department of Mathematics and Statistics, Hunter College, City University of New York, Hunter East 908,695 Park Avenue, New York, NY 10065, USA
| | - Rengasayee Veeraraghavan
- Department of Biomedical Engineering, College of Engineering, 2124 Fontana Labs,140 W. 19th Ave, The Ohio State University, Columbus, OH 43210, USA
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, 2255 Kenny Rd,Rm 5189, Pelotonia Research Center, Columbus, OH 43210, USA
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King DR, Demirtas M, Tarasov M, Struckman HL, Meng X, Nassal D, Moise N, Miller A, Min D, Soltisz AM, Anne MNK, Alves Dias PA, Wagnon JL, Weinberg SH, Hund TJ, Veeraraghavan R, Radwański PB. Cardiac-Specific Deletion of Scn8a Mitigates Dravet Syndrome-Associated Sudden Death in Adults. JACC Clin Electrophysiol 2024:S2405-500X(24)00007-0. [PMID: 38430092 DOI: 10.1016/j.jacep.2024.01.003] [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: 05/25/2023] [Revised: 12/27/2023] [Accepted: 01/03/2024] [Indexed: 03/03/2024]
Abstract
BACKGROUND Sudden unexpected death in epilepsy (SUDEP) is a fatal complication experienced by otherwise healthy epilepsy patients. Dravet syndrome (DS) is an inherited epileptic disorder resulting from loss of function of the voltage-gated sodium channel, NaV 1.1, and is associated with particularly high SUDEP risk. Evidence is mounting that NaVs abundant in the brain also occur in the heart, suggesting that the very molecular mechanisms underlying epilepsy could also precipitate cardiac arrhythmias and sudden death. Despite marked reduction of NaV 1.1 functional expression in DS, pathogenic late sodium current (INa,L) is paradoxically increased in DS hearts. However, the mechanisms by which DS directly impacts the heart to promote sudden death remain unclear. OBJECTIVES In this study the authors sought to provide evidence implicating remodeling of Na+ - and Ca2+ -handling machinery, including NaV 1.6 and Na+/Ca2+exchanger (NCX) within transverse (T)-tubules in DS-associated arrhythmias. METHODS The authors undertook scanning ion conductance microscopy (SICM)-guided patch clamp, super-resolution microscopy, confocal Ca2+ imaging, and in vivo electrocardiography studies in Scn1a haploinsufficient murine model of DS. RESULTS DS promotes INa,L in T-tubular nanodomains, but not in other subcellular regions. Consistent with increased NaV activity in these regions, super-resolution microscopy revealed increased NaV 1.6 density near Ca2+release channels, the ryanodine receptors (RyR2) and NCX in DS relative to WT hearts. The resulting INa,L in these regions promoted aberrant Ca2+ release, leading to ventricular arrhythmias in vivo. Cardiac-specific deletion of NaV 1.6 protects adult DS mice from increased T-tubular late NaV activity and the resulting arrhythmias, as well as sudden death. CONCLUSIONS These data demonstrate that NaV 1.6 undergoes remodeling within T-tubules of adult DS hearts serving as a substrate for Ca2+ -mediated cardiac arrhythmias and may be a druggable target for the prevention of SUDEP in adult DS subjects.
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Affiliation(s)
- D Ryan King
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Mustafa Demirtas
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Mikhail Tarasov
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Heather L Struckman
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Xiaolei Meng
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Drew Nassal
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Nicolae Moise
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Alec Miller
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Dennison Min
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Andrew M Soltisz
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Midhun N K Anne
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Neuroscience, College of Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Patrícia A Alves Dias
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Charles University, Akademika Heyrovského Hradec Králové, Czech Republic
| | - Jacy L Wagnon
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Neuroscience, College of Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Seth H Weinberg
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Thomas J Hund
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA; Department of Internal Medicine, Division of Cardiovascular Medicine, College of Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Rengasayee Veeraraghavan
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Przemysław B Radwański
- The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA.
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Mezache L, Soltisz AM, Johnstone SR, Isakson BE, Veeraraghavan R. Vascular Endothelial Barrier Protection Prevents Atrial Fibrillation by Preserving Cardiac Nanostructure. JACC Clin Electrophysiol 2023; 9:2444-2458. [PMID: 38032579 DOI: 10.1016/j.jacep.2023.10.013] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 10/20/2023] [Accepted: 10/21/2023] [Indexed: 12/01/2023]
Abstract
BACKGROUND Atrial fibrillation (AF), the most common cardiac arrhythmia, is widely associated with inflammation, vascular dysfunction, and elevated levels of the vascular leak-inducing cytokine, vascular endothelial growth factor (VEGF). Mechanisms underlying AF are poorly understood and current treatments only manage this progressive disease, rather than arresting the underlying pathology. The authors previously identified edema-induced disruption of sodium channel (NaV1.5)-rich intercalated disk nanodomains as a novel mechanism for AF initiation secondary to acute inflammation. Therefore, we hypothesized that protecting the vascular barrier can prevent vascular leak-induced atrial arrhythmias. OBJECTIVES In this study the authors tested the hypothesis that protecting the vascular barrier can prevent vascular leak-induced atrial arrhythmias. They identified 2 molecular targets for vascular barrier protection, connexin43 (Cx43) hemichannels and pannexin-1 (Panx1) channels, which have been implicated in cytokine-induced vascular leak. METHODS The authors undertook in vivo electrocardiography, electron microscopy, and super-resolution light microscopy studies in mice acutely treated with a clinically relevant level of VEGF. RESULTS AF incidence was increased in untreated mice exposed to VEGF relative to vehicle control subjects. VEGF also increased the average number of AF episodes. VEGF shifted NaV1.5 signal to longer distances from Cx43 gap junctions, measured by a distance transformation-based spatial analysis of 3-dimensional confocal images of intercalated disks. Similar effects were observed with NaV1.5 localized near mechanical junctions composed of neural cadherin. Blocking connexin43 hemichannels (αCT11 peptide) or Panx1 channels (PxIL2P peptide) significantly reduced the duration of AF episodes compared with VEGF alone with no treatment. Concurrently, both peptide therapies preserved NaV1.5 distance from gap junctions to control levels and reduced mechanical junction-adjacent intermembrane distance in these hearts. Notably, similar antiarrhythmic efficacy was also achieved with clinically-relevant small-molecule inhibitors of Cx43 and Panx1. CONCLUSIONS These results highlight vascular barrier protection as an antiarrhythmic strategy following inflammation-induced vascular leak.
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Affiliation(s)
- Louisa Mezache
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Andrew M Soltisz
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Scott R Johnstone
- Fralin Biomedical Research Institute at VTC, Centre for Vascular and Heart Research, Virginia Tech, Roanoke, Virginia, USA; Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA; Virginia Tech Carilion School of Medicine, Department of Surgery, Roanoke, Virginia, USA
| | - Brant E Isakson
- Department of Molecular Physiology and Biological Physics, School of Medicine, University of Virginia, Charlottesville, Virginia, USA; Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, Virginia, USA
| | - Rengasayee Veeraraghavan
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, Ohio, USA; The Frick Center for Heart Failure and Arrhythmia, Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA; Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, Ohio, USA.
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Soltisz AM, Veeraraghavan R. Improving Spatial Analysis of Fluorescence Microscopy Images using Point Process Analysis. Microsc Microanal 2023; 29:2096-2098. [PMID: 37612995 DOI: 10.1093/micmic/ozad067.1085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Andrew M Soltisz
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, United States
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Soltisz AM, Veeraraghavan R. A Point Process Analysis Framework for Quantitatively Describing Spatial Patterns from Fluorescence Microscopy Data. Microsc Microanal 2023; 29:1961-1963. [PMID: 37612915 DOI: 10.1093/micmic/ozad067.1016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Andrew M Soltisz
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, United States
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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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Veress R, Martin BY, Hamilton S, Bogdanov V, Terentyeva R, Perger F, Soltisz AM, Tikunova S, Veeraraghavan R, Gyorke S, Davis JP, Terentyev DA. Reduction of SK current in rat CPVT model with heterozygous calmodulin 3 mutation D132E is caused by impaired intracellular Ca 2+ homeostasis. Biophys J 2023; 122:521a. [PMID: 36784698 DOI: 10.1016/j.bpj.2022.11.2769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
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8
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Struckman H, Moise N, King R, Soltisz AM, Buxton A, Dunlap I, Chen Z, Radwanski P, Weinberg SH, Veeraraghavan R. A systematic investigation of the cardiac intercalated disk in health and disease. Biophys J 2023; 122:35a. [PMID: 36783824 DOI: 10.1016/j.bpj.2022.11.407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Affiliation(s)
- Heather Struckman
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Nicolae Moise
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Ryan King
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Andrew M Soltisz
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Andrew Buxton
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | | | - Zhenhui Chen
- Krannert Cardiovascular Research Center, Indiana University School of Medicine, Indianapolis, IN, USA
| | | | - Seth H Weinberg
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
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Soltisz AM, Veeraraghavan R. Nearest neighbor spatial statistics as a framework for analyzing spatial patterns from image data. Biophys J 2023; 122:275a. [PMID: 36783360 DOI: 10.1016/j.bpj.2022.11.1567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Affiliation(s)
- Andrew M Soltisz
- Biomedical Engineering, The Ohio State University, Columbus, OH, USA
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Maxwell CJ, Soltisz AM, Rich WW, Choi A, Reilly MA, Swindle-Reilly KE. Tunable alginate hydrogels as injectable drug delivery vehicles for optic neuropathy. J Biomed Mater Res A 2022; 110:1621-1635. [PMID: 35607724 PMCID: PMC9543600 DOI: 10.1002/jbm.a.37412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 02/08/2022] [Accepted: 05/06/2022] [Indexed: 11/08/2022]
Abstract
Many disease pathologies, particularly in the eye, are induced by oxidative stress. In particular, injury to the optic nerve (ON), or optic neuropathy, is one of the most common causes of vision loss. Traumatic optic neuropathy (TON) occurs when the ON is damaged following blunt or penetrating trauma to either the head or eye. Currently, there is no effective treatment for TON, only management options, namely the systematic delivery of corticosteroids and surgical decompression of the optic nerve. Unfortunately, neither option alleviates the generation of reactive oxygen species (ROS) which are responsible for downstream damage to the ON. Additionally, the systemic delivery of corticosteroids can cause fatal off‐target effects in cases with brain involvement. In this study, we developed a tunable injectable hydrogel delivery system for local methylene blue (MB) delivery using an internal method of crosslinking. MB was chosen due to its ROS scavenging ability and neuroprotective properties. Our MB‐loaded polymeric scaffold demonstrated prolonged release of MB as well as in situ gel formation. Additionally, following rheological characterization, these alginate hydrogels demonstrated minimal cytotoxicity to human retinal pigment epithelial cells in vitro and exhibited injection feasibility through small‐gauge needles. Our chosen MB concentrations displayed a high degree of ROS scavenging following release from the alginate hydrogels, suggesting this approach may be successful in reducing ROS levels following ON injury, or could be applied to other ocular injuries.
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Affiliation(s)
- Courtney J Maxwell
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Andrew M Soltisz
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Wade W Rich
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Andrew Choi
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Matthew A Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Katelyn E Swindle-Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA.,Department of Ophthalmology and Visual Sciences, The Ohio State University, Columbus, Ohio, USA
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Mezache L, Soltisz AM, Johnstone SR, Isakson B, Veeraraghavan R. Vascular endothelial barrier protection prevents nanoscale cardiac remodeling: a novel strategy to prevent atrial fibrillation. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.2242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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12
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Bogdanov V, Soltisz AM, Hernandez Orengo B, Sakuta G, Veeraraghavan R, Davis JP, Gyorke S. Spatially and functionally distinct pools of calmodulin mRNA in cardiac myocytes. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.1469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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13
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Soltisz AM, Struckman H, Radwanski P, Veeraraghavan R. Pathologically increased RyR2-Nav1.6 colocalization in db/db mouse model of diabetic cardiomyopathy. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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14
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Ham TR, Farrag M, Soltisz AM, Lakes EH, Allen KD, Leipzig ND. Automated Gait Analysis Detects Improvements after Intracellular σ Peptide Administration in a Rat Hemisection Model of Spinal Cord Injury. Ann Biomed Eng 2019; 47:744-753. [PMID: 30627839 DOI: 10.1007/s10439-019-02198-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 10/18/2018] [Accepted: 01/04/2019] [Indexed: 12/21/2022]
Abstract
A promising treatment strategy for spinal cord injury (SCI) is to reduce inhibition from chondroitin sulfate proteoglycans (CSPGs). For example, administering intracellular σ peptide (ISP) can improve the ability of axons to cross inhibitory CSPGs and improve function in rodent models of SCI. To translate such treatments into the clinic, we need robust and sensitive methods for studying rodent models. In this study, we applied a newly developed suite of quantitative gait analysis tools: gait analysis instrumentation and technology optimized for rodents (GAITOR), which consists of an arena and open-source software (AGATHA: automated gait analysis through hues and areas). We showed that GAITOR can be used to detect subtle functional improvements (measured by hindlimb duty factor imbalance) in rats following ISP administration in a T10 hemisection injury model. We demonstrated that SCI-specific parameters (right paw placement accuracy and phase dispersion) can be easily added to GAITOR to track recovery. We confirmed the gait observations via retrograde tracer uptake. We concluded that GAITOR is a powerful tool for measuring recovery after moderate/mild SCI, and could be used to replace expensive/inflexible commercially-available gait analysis techniques.
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Affiliation(s)
- Trevor R Ham
- Department of Biomedical Engineering, University of Akron, Akron, OH, USA
| | - Mahmoud Farrag
- Department of Biology, University of Akron, Akron, OH, USA
| | - Andrew M Soltisz
- Department of Biomedical Engineering, University of Akron, Akron, OH, USA
| | - Emily H Lakes
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
| | - Kyle D Allen
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
| | - Nic D Leipzig
- Department of Biomedical Engineering, University of Akron, Akron, OH, USA. .,Department of Biology, University of Akron, Akron, OH, USA. .,Department of Chemical and Biomolecular Engineering, University of Akron, Akron, OH, USA.
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