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  1. Article ; Online: A new mechanism links preamyloid oligomer formation in the myocyte stress response associated with atrial fibrillation.

    Pellman, Jason / Sheikh, Farah

    Journal of molecular and cellular cardiology

    2015  Volume 80, Page(s) 110–113

    MeSH term(s) Aldehydes/pharmacology ; Amyloid/metabolism ; Animals ; Heart Atria/metabolism ; Heart Atria/pathology ; Humans ; Protein Folding/drug effects ; Protein Multimerization
    Chemical Substances Aldehydes ; Amyloid
    Language English
    Publishing date 2015-03
    Publishing country England
    Document type Comment ; Editorial ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2014.12.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Heritable transcriptional defects from aberrations of nuclear architecture.

    Papathanasiou, Stamatis / Mynhier, Nikos A / Liu, Shiwei / Brunette, Gregory / Stokasimov, Ema / Jacob, Etai / Li, Lanting / Comenho, Caroline / van Steensel, Bas / Buenrostro, Jason D / Zhang, Cheng-Zhong / Pellman, David

    Nature

    2023  Volume 619, Issue 7968, Page(s) 184–192

    Abstract: Transcriptional heterogeneity due to plasticity of the epigenetic state of chromatin contributes to tumour evolution, metastasis and drug ... ...

    Abstract Transcriptional heterogeneity due to plasticity of the epigenetic state of chromatin contributes to tumour evolution, metastasis and drug resistance
    MeSH term(s) Humans ; Chromatin/genetics ; Chromatin/metabolism ; Chromosomal Instability ; Chromosomes/genetics ; Clone Cells/metabolism ; DNA Damage/genetics ; Epigenesis, Genetic ; Gene Expression Regulation, Neoplastic ; Micronuclei, Chromosome-Defective ; Neoplasms/genetics ; Neoplasms/pathology ; Single-Cell Gene Expression Analysis ; Transcription, Genetic
    Chemical Substances Chromatin
    Language English
    Publishing date 2023-06-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-023-06157-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Atrial fibrillation: mechanisms, therapeutics, and future directions.

    Pellman, Jason / Sheikh, Farah

    Comprehensive Physiology

    2015  Volume 5, Issue 2, Page(s) 649–665

    Abstract: Atrial fibrillation (AF) is the most prevalent cardiac arrhythmia, affecting 1% to 2% of the general population. It is characterized by rapid and disorganized atrial activation leading to impaired atrial function, which can be diagnosed on an EKG by lack ...

    Abstract Atrial fibrillation (AF) is the most prevalent cardiac arrhythmia, affecting 1% to 2% of the general population. It is characterized by rapid and disorganized atrial activation leading to impaired atrial function, which can be diagnosed on an EKG by lack of a P-wave and irregular QRS complexes. AF is associated with increased morbidity and mortality and is a risk factor for embolic stroke and worsening heart failure. Current research on AF support and explore the hypothesis that initiation and maintenance of AF require pathophysiological remodeling of the atria, either specifically as in lone AF or secondary to other heart disease as in heart failure-associated AF. Remodeling in AF can be grouped into three categories that include: (i) electrical remodeling, which includes modulation of L-type Ca(2+) current, various K(+) currents and gap junction function; (ii) structural remodeling, which includes changes in tissues properties, size, and ultrastructure; and (iii) autonomic remodeling, including altered sympathovagal activity and hyperinnervation. Electrical, structural, and autonomic remodeling all contribute to creating an AF-prone substrate which is able to produce AF-associated electrical phenomena including a rapidly firing focus, complex multiple reentrant circuit or rotors. Although various remodeling events occur in AF, current AF therapies focus on ventricular rate and rhythm control strategies using pharmacotherapy and surgical interventions. Recent progress in the field has started to focus on the underlying substrate that drives and maintains AF (termed upstream therapies); however, much work is needed in this area. Here, we review current knowledge of AF mechanisms, therapies, and new areas of investigation.
    MeSH term(s) Animals ; Anti-Arrhythmia Agents/therapeutic use ; Atrial Fibrillation/drug therapy ; Atrial Fibrillation/physiopathology ; Forecasting ; Heart Atria/physiopathology ; Heart Conduction System/physiopathology ; Humans ; Models, Cardiovascular
    Chemical Substances Anti-Arrhythmia Agents
    Language English
    Publishing date 2015-04
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ISSN 2040-4603
    ISSN (online) 2040-4603
    DOI 10.1002/cphy.c140047
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Myocyte-fibroblast communication in cardiac fibrosis and arrhythmias: Mechanisms and model systems.

    Pellman, Jason / Zhang, Jing / Sheikh, Farah

    Journal of molecular and cellular cardiology

    2016  Volume 94, Page(s) 22–31

    Abstract: Development of cardiac fibrosis and arrhythmias is controlled by the activity of and communication between cardiomyocytes and fibroblasts in the heart. Myocyte-fibroblast interactions occur via both direct and indirect means including paracrine mediators, ...

    Abstract Development of cardiac fibrosis and arrhythmias is controlled by the activity of and communication between cardiomyocytes and fibroblasts in the heart. Myocyte-fibroblast interactions occur via both direct and indirect means including paracrine mediators, extracellular matrix interactions, electrical modulators, mechanical junctions, and membrane nanotubes. In the diseased heart, cardiomyocyte and fibroblast ratios and activity, and thus myocyte-fibroblast interactions, change and are thought to contribute to the course of disease including development of fibrosis and arrhythmogenic activity. Fibroblasts have a developing role in modulating cardiomyocyte electrical and hypertrophic activity, however gaps in knowledge regarding these interactions still exist. Research in this field has necessitated the development of unique approaches to isolate and control myocyte-fibroblast interactions. Numerous methods for 2D and 3D co-culture systems have been developed, while a growing part of this field is in the use of better tools for in vivo systems including cardiomyocyte and fibroblast specific Cre mouse lines for cell type specific genetic ablation. This review will focus on (i) mechanisms of myocyte-fibroblast communication and their effects on disease features such as cardiac fibrosis and arrhythmias as well as (ii) methods being used and currently developed in this field.
    MeSH term(s) Animals ; Arrhythmias, Cardiac/metabolism ; Arrhythmias, Cardiac/physiopathology ; Cell Communication ; Coculture Techniques ; Disease Models, Animal ; Extracellular Matrix/metabolism ; Extracellular Matrix Proteins/metabolism ; Fibroblasts/metabolism ; Fibrosis ; Humans ; In Vitro Techniques ; Models, Biological ; Myocardium/metabolism ; Myocardium/pathology ; Myocytes, Cardiac/metabolism
    Chemical Substances Extracellular Matrix Proteins
    Language English
    Publishing date 2016-03-18
    Publishing country England
    Document type Journal Article ; Review ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2016.03.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Cell junctions in the specialized conduction system of the heart.

    Mezzano, Valeria / Pellman, Jason / Sheikh, Farah

    Cell communication & adhesion

    2014  Volume 21, Issue 3, Page(s) 149–159

    Abstract: Anchoring cell junctions are integral in maintaining electro-mechanical coupling of ventricular working cardiomyocytes; however, their role in cardiomyocytes of the cardiac conduction system (CCS) remains less clear. Recent studies in genetic mouse ... ...

    Abstract Anchoring cell junctions are integral in maintaining electro-mechanical coupling of ventricular working cardiomyocytes; however, their role in cardiomyocytes of the cardiac conduction system (CCS) remains less clear. Recent studies in genetic mouse models and humans highlight the appearance of these cell junctions alongside gap junctions in the CCS and also show that defects in these structures and their components are associated with conduction impairments in the CCS. Here we outline current evidence supporting an integral relationship between anchoring and gap junctions in the CCS. Specifically we focus on (1) molecular and ultrastructural evidence for cell-cell junctions in specialized cardiomyocytes of the CCS, (2) genetic mouse models specifically targeting cell-cell junction components in the heart which exhibit CCS conduction defects and (3) human clinical studies from patients with cell-cell junction-based diseases that exhibit CCS electrophysiological defects.
    MeSH term(s) Animals ; Heart Conduction System/cytology ; Heart Conduction System/metabolism ; Humans ; Intercellular Junctions/metabolism ; Mice
    Language English
    Publishing date 2014-04-16
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2065474-1
    ISSN 1543-5180 ; 1061-5385 ; 1541-9061
    ISSN (online) 1543-5180
    ISSN 1061-5385 ; 1541-9061
    DOI 10.3109/15419061.2014.905928
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Desmosomal COP9 regulates proteome degradation in arrhythmogenic right ventricular dysplasia/cardiomyopathy.

    Liang, Yan / Lyon, Robert C / Pellman, Jason / Bradford, William H / Lange, Stephan / Bogomolovas, Julius / Dalton, Nancy D / Gu, Yusu / Bobar, Marcus / Lee, Mong-Hong / Iwakuma, Tomoo / Nigam, Vishal / Asimaki, Angeliki / Scheinman, Melvin / Peterson, Kirk L / Sheikh, Farah

    The Journal of clinical investigation

    2021  Volume 131, Issue 11

    Abstract: Dysregulated protein degradative pathways are increasingly recognized as mediators of human disease. This mechanism may have particular relevance to desmosomal proteins that play critical structural roles in both tissue architecture and cell-cell ... ...

    Abstract Dysregulated protein degradative pathways are increasingly recognized as mediators of human disease. This mechanism may have particular relevance to desmosomal proteins that play critical structural roles in both tissue architecture and cell-cell communication, as destabilization/breakdown of the desmosomal proteome is a hallmark of genetic-based desmosomal-targeted diseases, such as the cardiac disease arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C). However, no information exists on whether there are resident proteins that regulate desmosomal proteome homeostasis. Here, we uncovered a cardiac constitutive photomorphogenesis 9 (COP9) desmosomal resident protein complex, composed of subunit 6 of the COP9 signalosome (CSN6), that enzymatically restricted neddylation and targeted desmosomal proteome degradation. CSN6 binding, localization, levels, and function were affected in hearts of classic mouse and human models of ARVD/C affected by desmosomal loss and mutations, respectively. Loss of desmosomal proteome degradation control due to junctional reduction/loss of CSN6 and human desmosomal mutations destabilizing junctional CSN6 were also sufficient to trigger ARVD/C in mice. We identified a desmosomal resident regulatory complex that restricted desmosomal proteome degradation and disease.
    MeSH term(s) Adaptor Proteins, Signal Transducing/genetics ; Adaptor Proteins, Signal Transducing/metabolism ; Animals ; Arrhythmogenic Right Ventricular Dysplasia/genetics ; Arrhythmogenic Right Ventricular Dysplasia/metabolism ; COP9 Signalosome Complex/genetics ; COP9 Signalosome Complex/metabolism ; Desmosomes/genetics ; Desmosomes/metabolism ; Desmosomes/pathology ; Disease Models, Animal ; Female ; Humans ; Male ; Mice ; Mice, Knockout ; Proteolysis ; Proteome/genetics ; Proteome/metabolism
    Chemical Substances Adaptor Proteins, Signal Transducing ; Cops6 protein, mouse ; Proteome ; COP9 Signalosome Complex (EC 3.4.19.12)
    Language English
    Publishing date 2021-03-27
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Video-Audio Media
    ZDB-ID 3067-3
    ISSN 1558-8238 ; 0021-9738
    ISSN (online) 1558-8238
    ISSN 0021-9738
    DOI 10.1172/JCI137689
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Using wastewater-based analysis to monitor the effects of legalized retail sales on cannabis consumption in Washington State, USA.

    Burgard, Daniel A / Williams, Jason / Westerman, Danielle / Rushing, Rosie / Carpenter, Riley / LaRock, Addison / Sadetsky, Jane / Clarke, Jackson / Fryhle, Heather / Pellman, Melissa / Banta-Green, Caleb J

    Addiction (Abingdon, England)

    2019  Volume 114, Issue 9, Page(s) 1582–1590

    Abstract: Aims: To perform a wastewater-based analysis to explore the impact of newly legalized retail cannabis sales on its use and to determine if this approach could estimate the size of the legal market place, which began 1 August 2014 in the study area.: ... ...

    Abstract Aims: To perform a wastewater-based analysis to explore the impact of newly legalized retail cannabis sales on its use and to determine if this approach could estimate the size of the legal market place, which began 1 August 2014 in the study area.
    Design: Laboratory study of raw wastewater samples collected and analyzed over the 3-year period from 2014 to 2016.
    Setting and participants: Samples obtained from the two wastewater treatment plants that serviced a municipality of 200 000 people in the state of Washington, USA.
    Measurements: Quantitative analysis of 24-hour composite influent samples for the metabolite of the active ingredient in cannabis, 11-nor-9-Carboxy-Δ9-tetrahydrocannabinol (THC-COOH) were performed by liquid chromatography coupled to mass spectrometry.
    Findings: Wastewater estimates for THC-COOH increased by 9% per quarter, suggesting a doubling in cannabis consumption from 1 December 2013 to 31 December 2016. State-sold THC increased at nearly 70% per quarter, while stores operated from 1 August 2014 to 31 December 2016. Estimating the proportion of the total cannabis market supplied by state-regulated cannabis from these data is not currently achievable.
    Conclusion: A wastewater-based measure of cannabis consumption suggests a significant increase in consumption in Washington, USA following legalization, and that legal sales appear to have displaced a large portion of the illicit market.
    MeSH term(s) Chromatography, Liquid ; Commerce/legislation & jurisprudence ; Dronabinol/analogs & derivatives ; Dronabinol/analysis ; Humans ; Marijuana Use/epidemiology ; Marijuana Use/legislation & jurisprudence ; Marijuana Use/trends ; Mass Spectrometry ; Washington/epidemiology ; Wastewater-Based Epidemiological Monitoring
    Chemical Substances 11-nor-delta(9)-tetrahydrocannabinol-9-carboxylic acid (4TPC9E4A32) ; Dronabinol (7J8897W37S)
    Language English
    Publishing date 2019-06-18
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1141051-6
    ISSN 1360-0443 ; 0965-2140
    ISSN (online) 1360-0443
    ISSN 0965-2140
    DOI 10.1111/add.14641
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Extracellular matrix remodeling in atrial fibrosis: mechanisms and implications in atrial fibrillation.

    Pellman, Jason / Lyon, Robert C / Sheikh, Farah

    Journal of molecular and cellular cardiology

    2009  Volume 48, Issue 3, Page(s) 461–467

    Abstract: Atrial fibrosis has been strongly associated with the presence of heart diseases/arrhythmias, including congestive heart failure (CHF) and atrial fibrillation (AF). Inducibility of AF as a result of atrial fibrosis has been the subject of intense recent ... ...

    Abstract Atrial fibrosis has been strongly associated with the presence of heart diseases/arrhythmias, including congestive heart failure (CHF) and atrial fibrillation (AF). Inducibility of AF as a result of atrial fibrosis has been the subject of intense recent investigation since it is the most commonly encountered arrhythmia in adults and can substantially increase the risk of premature death. Rhythm and rate control drugs as well as surgical interventions are used as therapies for AF; however, increased attention has been diverted to mineralocorticoid receptor (MR) antagonists including spironolactone as potential therapies for human AF because of their positive effects on reducing atrial fibrosis and associated AF in animal models. Spironolactone has been shown to exert positive effects in human patients with heart failure; however, the mechanisms and effects in human atrial fibrosis and AF remain undetermined. This review will discuss and highlight developments on (i) the relationship between atrial fibrosis and AF, (ii) spironolactone, as a drug targeted to atrial fibrosis and AF, as well as (iii) the distinct and common mechanisms important for regulating atrial and ventricular fibrosis, inclusive of the key extracellular matrix regulatory proteins involved.
    MeSH term(s) Angiotensin II Type 1 Receptor Blockers/therapeutic use ; Animals ; Atrial Fibrillation/drug therapy ; Atrial Fibrillation/metabolism ; Atrial Fibrillation/physiopathology ; Extracellular Matrix/metabolism ; Fibrosis/drug therapy ; Fibrosis/metabolism ; Fibrosis/physiopathology ; Heart Atria/metabolism ; Heart Atria/pathology ; Heart Atria/physiopathology ; Humans ; Signal Transduction/drug effects ; Spironolactone/therapeutic use
    Chemical Substances Angiotensin II Type 1 Receptor Blockers ; Spironolactone (27O7W4T232)
    Language English
    Publishing date 2009-09-12
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2009.09.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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