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  1. Article ; Online: MCU-independent Ca

    Bround, Michael J / Abay, Eaman / Huo, Jiuzhou / Havens, Julian R / York, Allen J / Bers, Donald M / Molkentin, Jeffery D

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 6751

    Abstract: Mitochondrial ... ...

    Abstract Mitochondrial Ca
    MeSH term(s) Animals ; Humans ; Mice ; Calcium/metabolism ; Calcium Channels/metabolism ; Cell Death ; Mitochondria/metabolism ; Mitochondrial Membrane Transport Proteins/metabolism ; Muscular Dystrophy, Duchenne/pathology ; Necrosis/metabolism
    Chemical Substances Calcium (SY7Q814VUP) ; Calcium Channels ; Mitochondrial Membrane Transport Proteins ; Mcu protein, mouse
    Language English
    Publishing date 2024-03-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-57340-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Increasing SERCA function promotes initiation of calcium sparks and breakup of calcium waves.

    Sato, Daisuke / Uchinoumi, Hitoshi / Bers, Donald M

    The Journal of physiology

    2021  Volume 599, Issue 13, Page(s) 3267–3278

    Abstract: Key points: Increasing sarcoplasmic/endoplasmic reticulum calcium ATPase (SERCA) pump activity enhances sarcoplasmic reticulum calcium (Ca) load, which increases both ryanodine receptor opening and driving force of Ca release flux. Both of these effects ...

    Abstract Key points: Increasing sarcoplasmic/endoplasmic reticulum calcium ATPase (SERCA) pump activity enhances sarcoplasmic reticulum calcium (Ca) load, which increases both ryanodine receptor opening and driving force of Ca release flux. Both of these effects promote Ca spark formation and wave propagation. However, increasing SERCA activity also accelerates local cytosolic Ca decay as the wave front travels to the next cluster, which limits wave propagation. As a result, increasing SERCA pump activity has a biphasic effect on the propensity of arrhythmogenic Ca waves, but a monotonic effect to increase Ca spark frequency and amplitude.
    Abstract: Waves of sarcoplasmic reticulum (SR) calcium (Ca) release can cause arrhythmogenic afterdepolarizations in cardiac myocytes. Ca waves propagate when Ca sparks at one Ca release unit (CRU) recruit new Ca sparks in neighbouring CRUs. Under normal conditions, Ca sparks are too small to recruit neighbouring Ca sparks where Ca sensitivity is also low. However, under pathological conditions such as a Ca overload or ryanodine receptor (RyR) sensitization, Ca sparks can be larger and propagate more readily as macro-sparks or full Ca waves. Increasing SERCA pump activity promotes SR Ca load, which promotes RyR opening and increases driving force of the Ca release flux from SR to cytosol, promoting Ca waves. However, high sarcoplasmic/endoplasmic reticulum calcium ATPase (SERCA) activity can also decrease local cytosolic [Ca] as it approaches the next CRU, thereby reducing wave appearance and propagation. In this study, we use a physiologically detailed model of subcellular Ca cycling and experiments in phospholamban-knockout mice, to show how Ca waves are initiated and propagate and how different conditions contribute to the generation and propagation of Ca waves. We show that reducing diffusive coupling between Ca sparks by increasing SERCA activity prevents Ca waves by reducing [Ca] at the next CRU, as do Ca buffers, low intra-SR Ca diffusion and distance between CRUs. Increasing SR Ca uptake rate has a biphasic effect on Ca wave propagation; initially it enhances Ca spark probability and amplitude and CRU coupling, thereby promoting arrhythmogenic Ca wave propagation, but at higher levels SR Ca uptake can abort those arrhythmogenic Ca waves.
    MeSH term(s) Animals ; Calcium/metabolism ; Calcium Signaling ; Mice ; Myocytes, Cardiac/metabolism ; Ryanodine Receptor Calcium Release Channel/metabolism ; Sarcoplasmic Reticulum/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism
    Chemical Substances Ryanodine Receptor Calcium Release Channel ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2021-06-05
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP281579
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Molecular Mechanism of a FRET Biosensor for the Cardiac Ryanodine Receptor Pathologically Leaky State.

    Svensson, Bengt / Nitu, Florentin R / Rebbeck, Robyn T / McGurran, Lindsey M / Oda, Tetsuro / Thomas, David D / Bers, Donald M / Cornea, Razvan L

    bioRxiv : the preprint server for biology

    2023  

    Abstract: ... ...

    Abstract Ca
    Language English
    Publishing date 2023-07-08
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.07.07.548138
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Molecular Mechanism of a FRET Biosensor for the Cardiac Ryanodine Receptor Pathologically Leaky State.

    Svensson, Bengt / Nitu, Florentin R / Rebbeck, Robyn T / McGurran, Lindsey M / Oda, Tetsuro / Thomas, David D / Bers, Donald M / Cornea, Razvan L

    International journal of molecular sciences

    2023  Volume 24, Issue 16

    Abstract: ... ...

    Abstract Ca
    MeSH term(s) Binding Sites ; Drug Delivery Systems ; Fluorescence Resonance Energy Transfer ; Ryanodine Receptor Calcium Release Channel
    Chemical Substances Ryanodine Receptor Calcium Release Channel
    Language English
    Publishing date 2023-08-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms241612547
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: A 20/20 view of ANT function in mitochondrial biology and necrotic cell death.

    Bround, Michael J / Bers, Donald M / Molkentin, Jeffery D

    Journal of molecular and cellular cardiology

    2020  Volume 144, Page(s) A3–A13

    Abstract: The adenosine nucleotide translocase (ANT) family of proteins are inner mitochondrial membrane proteins involved in energy homeostasis and cell death. The primary function of ANT proteins is to exchange cytosolic ADP with matrix ATP, facilitating the ... ...

    Abstract The adenosine nucleotide translocase (ANT) family of proteins are inner mitochondrial membrane proteins involved in energy homeostasis and cell death. The primary function of ANT proteins is to exchange cytosolic ADP with matrix ATP, facilitating the export of newly synthesized ATP to the cell while providing new ADP substrate to the mitochondria. As such, the ANT proteins are central to maintaining energy homeostasis in all eukaryotic cells. Evidence also suggests that the ANTs constitute a pore-forming component of the mitochondrial permeability transition pore (MPTP), a structure that forms in the inner mitochondrial membrane that is thought to underlie regulated necrotic cell death. Additionally, emerging studies suggest that ANT proteins are also critical for mitochondrial uncoupling and for promoting mitophagy. Thus, the ANTs are multifunctional proteins that are poised to participate in several aspects of mitochondrial biology and the greater regulation of cell death, which will be discussed here.
    MeSH term(s) Animals ; Gene Expression Regulation ; Humans ; Mitochondria/genetics ; Mitochondria/metabolism ; Mitochondrial ADP, ATP Translocases/genetics ; Mitochondrial ADP, ATP Translocases/metabolism ; Mitochondrial Membrane Transport Proteins/genetics ; Mitochondrial Membrane Transport Proteins/metabolism ; Mitochondrial Permeability Transition Pore/metabolism ; Models, Biological ; Multigene Family ; Necroptosis/genetics ; Oxidative Phosphorylation
    Chemical Substances Mitochondrial Membrane Transport Proteins ; Mitochondrial Permeability Transition Pore ; Mitochondrial ADP, ATP Translocases (9068-80-8)
    Language English
    Publishing date 2020-05-23
    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.2020.05.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Cardiac sarcoplasmic reticulum calcium leak: basis and roles in cardiac dysfunction.

    Bers, Donald M

    Annual review of physiology

    2013  Volume 76, Page(s) 107–127

    Abstract: ... diastolic [Ca]i, contributing to diastolic dysfunction; (c) cause triggered arrhythmias; and (d) be ...

    Abstract Synchronized SR calcium (Ca) release is critical to normal cardiac myocyte excitation-contraction coupling, and ideally this release shuts off completely between heartbeats. However, other SR Ca release events are referred to collectively as SR Ca leak (which includes Ca sparks and waves as well as smaller events not detectable as Ca sparks). Much, but not all, of the SR Ca leak occurs via ryanodine receptors and can be exacerbated in pathological states such as heart failure. The extent of SR Ca leak is important because it can (a) reduce SR Ca available for release, causing systolic dysfunction; (b) elevate diastolic [Ca]i, contributing to diastolic dysfunction; (c) cause triggered arrhythmias; and (d) be energetically costly because of extra ATP used to repump Ca. This review addresses quantitative aspects and manifestations of SR Ca leak and its measurement, and how leak is modulated by Ca, associated proteins, and posttranslational modifications in health and disease.
    MeSH term(s) Animals ; Calcium/metabolism ; Calcium Signaling/physiology ; Heart Diseases/metabolism ; Heart Diseases/physiopathology ; Humans ; Myocardium/metabolism ; Myocytes, Cardiac/metabolism ; Rabbits ; Rats ; Ryanodine Receptor Calcium Release Channel/physiology ; Sarcoplasmic Reticulum/metabolism
    Chemical Substances Ryanodine Receptor Calcium Release Channel ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2013-11-13
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 207933-1
    ISSN 1545-1585 ; 0066-4278
    ISSN (online) 1545-1585
    ISSN 0066-4278
    DOI 10.1146/annurev-physiol-020911-153308
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: MCUb is an inducible regulator of calcium-dependent mitochondrial metabolism and substrate utilization in muscle.

    Huo, Jiuzhou / Prasad, Vikram / Grimes, Kelly M / Vanhoutte, Davy / Blair, N Scott / Lin, Suh-Chin / Bround, Michael J / Bers, Donald M / Molkentin, Jeffery D

    Cell reports

    2023  Volume 42, Issue 11, Page(s) 113465

    Abstract: Mitochondria use the electron transport chain to generate high-energy phosphate from oxidative phosphorylation, a process also regulated by the mitochondrial ... ...

    Abstract Mitochondria use the electron transport chain to generate high-energy phosphate from oxidative phosphorylation, a process also regulated by the mitochondrial Ca
    MeSH term(s) Animals ; Mice ; Calcium/metabolism ; Calcium Channels/metabolism ; Fatty Acids/metabolism ; Mitochondria/metabolism ; Muscle, Skeletal/metabolism
    Chemical Substances Calcium (SY7Q814VUP) ; Calcium Channels ; Fatty Acids ; Mcub protein, mouse
    Language English
    Publishing date 2023-11-16
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2023.113465
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Protein Kinase D1 Regulates Cardiac Hypertrophy, Potassium Channel Remodeling, and Arrhythmias in Heart Failure.

    Bossuyt, Julie / Borst, Johanna M / Verberckmoes, Marie / Bailey, Logan R J / Bers, Donald M / Hegyi, Bence

    Journal of the American Heart Association

    2022  Volume 11, Issue 19, Page(s) e027573

    Abstract: Background Structural and electrophysiological remodeling characterize heart failure (HF) enhancing arrhythmias. PKD1 (protein kinase D1) is upregulated in HF and mediates pathological hypertrophic signaling, but its role in K+ channel remodeling and ... ...

    Abstract Background Structural and electrophysiological remodeling characterize heart failure (HF) enhancing arrhythmias. PKD1 (protein kinase D1) is upregulated in HF and mediates pathological hypertrophic signaling, but its role in K+ channel remodeling and arrhythmogenesis in HF is unknown. Methods and Results We performed echocardiography, electrophysiology, and expression analysis in wild-type and PKD1 cardiomyocyte-specific knockout (cKO) mice following transverse aortic constriction (TAC). PKD1-cKO mice exhibited significantly less cardiac hypertrophy post-TAC and were protected from early decline in cardiac contractile function (3 weeks post-TAC) but not the progression to HF at 7 weeks post-TAC. Wild-type mice exhibited ventricular action potential duration prolongation at 8 weeks post-TAC, which was attenuated in PKD1-cKO, consistent with larger K+ currents via the transient outward current, sustained current, inward rectifier K+ current, and rapid delayed rectifier K+ current and increased expression of corresponding K+ channels. Conversely, reduction of slowly inactivating K+ current was independent of PKD1 in HF. Acute PKD inhibition slightly increased transient outward current in TAC and sham wild-type myocytes but did not alter other K+ currents. Sham PKD1-cKO versus wild-type also exhibited larger transient outward current and faster early action potential repolarization. Tachypacing-induced action potential duration alternans in TAC animals was increased and independent of PKD1, but diastolic arrhythmogenic activities were reduced in PKD1-cKO. Conclusions Our data indicate an important role for PKD1 in the HF-related hypertrophic response and K+ channel downregulation. Therefore, PKD1 inhibition may represent a therapeutic strategy to reduce hypertrophy and arrhythmias; however, PKD1 inhibition may not prevent disease progression and reduced contractility in HF.
    MeSH term(s) Animals ; Mice ; Action Potentials/physiology ; Arrhythmias, Cardiac/genetics ; Arrhythmias, Cardiac/metabolism ; Cardiomegaly/metabolism ; Heart Failure/genetics ; Heart Failure/metabolism ; Myocytes, Cardiac/metabolism ; Potassium/metabolism ; Potassium Channels/metabolism ; Protein Kinase C/genetics ; Protein Kinase C/metabolism
    Chemical Substances Potassium (RWP5GA015D) ; Potassium Channels ; Protein Kinase C (EC 2.7.11.13) ; protein kinase D (EC 2.7.10.-)
    Language English
    Publishing date 2022-09-29
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2653953-6
    ISSN 2047-9980 ; 2047-9980
    ISSN (online) 2047-9980
    ISSN 2047-9980
    DOI 10.1161/JAHA.122.027573
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  9. Article ; Online: Differential sex-dependent susceptibility to diastolic dysfunction and arrhythmia in cardiomyocytes from obese diabetic HFpEF model.

    Mira Hernandez, Juliana / Shen, Erin Y / Ko, Christopher Y / Hourani, Zaynab / Spencer, Emily R / Smoliarchuk, Daria / Bossuyt, Julie / Granzier, Henk / Bers, Donald M / Hegyi, Bence

    Cardiovascular research

    2024  

    Abstract: Aim: Sex-differences in heart failure with preserved ejection fraction (HFpEF) are important, but key mechanisms involved are incompletely understood. While animal models can inform about sex-dependent cellular and molecular changes, many previous ... ...

    Abstract Aim: Sex-differences in heart failure with preserved ejection fraction (HFpEF) are important, but key mechanisms involved are incompletely understood. While animal models can inform about sex-dependent cellular and molecular changes, many previous preclinical HFpEF models have failed to recapitulate sex-dependent characteristics of human HFpEF. We tested for sex-differences in HFpEF using a two-hit mouse model (leptin receptor-deficient db/db mice plus aldosterone infusion for 4 weeks; db/db+Aldo).
    Methods and results: We performed echocardiography, electrophysiology, intracellular Ca2+ imaging, and protein analysis. Female HFpEF mice exhibited more severe diastolic dysfunction in line with increased titin N2B isoform expression and PEVK element phosphorylation, and reduced troponin-I phosphorylation. Female HFpEF mice had lower BNP levels than males despite similar comorbidity burden (obesity, diabetes) and cardiac hypertrophy in both sexes. Male HFpEF mice were more susceptible to cardiac alternans. Male HFpEF cardiomyocytes (versus female) exhibited higher diastolic [Ca2+], slower Ca2+ transient decay, reduced L-type Ca2+ current, more pronounced enhancement of the late Na+ current, and increased short-term variability of action potential duration (APD). However, male and female HFpEF myocytes showed similar downregulation of inward rectifier and transient outward K+ currents, APD prolongation, and frequency of delayed afterdepolarizations. Inhibition of Ca2+/calmodulin-dependent protein kinase II (CaMKII) reversed all pathological APD changes in HFpEF in both sexes, and empagliflozin pretreatment mimicked these effects of CaMKII inhibition. Vericiguat had only slight benefits, and these effects were larger in HFpEF females.
    Conclusion: We conclude that the db/db+Aldo preclinical HFpEF murine model recapitulates key sex-specific mechanisms in HFpEF and provides mechanistic insights into impaired excitation-contraction coupling and sex-dependent differential arrhythmia susceptibility in HFpEF with potential therapeutic implications. In male HFpEF myocytes, altered Ca2+ handling and electrophysiology aligned with diastolic dysfunction and arrhythmias, while worse diastolic dysfunction in females may depend more on altered myofilaments properties.
    Language English
    Publishing date 2024-04-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 80340-6
    ISSN 1755-3245 ; 0008-6363
    ISSN (online) 1755-3245
    ISSN 0008-6363
    DOI 10.1093/cvr/cvae070
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  10. Article ; Online: CaMKII and PKA-dependent phosphorylation co-regulate nuclear localization of HDAC4 in adult cardiomyocytes.

    Helmstadter, Kathryn G / Ljubojevic-Holzer, Senka / Wood, Brent M / Taheri, Khanha D / Sedej, Simon / Erickson, Jeffrey R / Bossuyt, Julie / Bers, Donald M

    Basic research in cardiology

    2021  Volume 116, Issue 1, Page(s) 11

    Abstract: Nuclear histone deacetylase 4 (HDAC4) represses MEF2-mediated transcription, implicated in the development of heart failure. CaMKII-dependent phosphorylation drives nucleus-to-cytoplasm HDAC4 shuttling, but protein kinase A (PKA) is also linked to HDAC4 ... ...

    Abstract Nuclear histone deacetylase 4 (HDAC4) represses MEF2-mediated transcription, implicated in the development of heart failure. CaMKII-dependent phosphorylation drives nucleus-to-cytoplasm HDAC4 shuttling, but protein kinase A (PKA) is also linked to HDAC4 translocation. However, the interplay of CaMKII and PKA in regulating adult cardiomyocyte HDAC4 translocation is unclear. Here we sought to determine the interplay of PKA- and CaMKII-dependent HDAC4 phosphorylation and translocation in adult mouse, rabbit and human ventricular myocytes. Confocal imaging and protein analyses revealed that inhibition of CaMKII-but not PKA, PKC or PKD-raised nucleo-to-cytoplasmic HDAC4 fluorescence ratio (F
    MeSH term(s) Active Transport, Cell Nucleus ; Adrenergic beta-Agonists/pharmacology ; Animals ; Calcium-Calmodulin-Dependent Protein Kinase Type 2/antagonists & inhibitors ; Calcium-Calmodulin-Dependent Protein Kinase Type 2/metabolism ; Cardiomegaly/enzymology ; Cardiomegaly/genetics ; Cardiomegaly/pathology ; Cardiomegaly/physiopathology ; Cells, Cultured ; Cyclic AMP-Dependent Protein Kinases/antagonists & inhibitors ; Cyclic AMP-Dependent Protein Kinases/metabolism ; Disease Models, Animal ; Female ; Heart Failure/enzymology ; Heart Failure/genetics ; Heart Failure/pathology ; Heart Failure/physiopathology ; Histone Deacetylases/genetics ; Histone Deacetylases/metabolism ; Humans ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Mutation ; Myocytes, Cardiac/drug effects ; Myocytes, Cardiac/enzymology ; Myocytes, Cardiac/pathology ; Phosphorylation ; Protein Kinase Inhibitors/pharmacology ; Rabbits ; Repressor Proteins ; Signal Transduction ; Ventricular Remodeling
    Chemical Substances Adrenergic beta-Agonists ; Protein Kinase Inhibitors ; Repressor Proteins ; Cyclic AMP-Dependent Protein Kinases (EC 2.7.11.11) ; Calcium-Calmodulin-Dependent Protein Kinase Type 2 (EC 2.7.11.17) ; Camk2g protein, mouse (EC 2.7.11.17) ; HDAC4 protein, human (EC 3.5.1.98) ; Hdac5 protein, mouse (EC 3.5.1.98) ; Histone Deacetylases (EC 3.5.1.98)
    Language English
    Publishing date 2021-02-15
    Publishing country Germany
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 189755-x
    ISSN 1435-1803 ; 0300-8428 ; 0175-9418
    ISSN (online) 1435-1803
    ISSN 0300-8428 ; 0175-9418
    DOI 10.1007/s00395-021-00850-2
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