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  1. Article ; Online: Myostatin/Activin Receptor Ligands in Muscle and the Development Status of Attenuating Drugs.

    Rodgers, Buel D / Ward, Christopher W

    Endocrine reviews

    2021  Volume 43, Issue 2, Page(s) 329–365

    Abstract: Muscle wasting disease indications are among the most debilitating and often deadly noncommunicable disease states. As a comorbidity, muscle wasting is associated with different neuromuscular diseases and myopathies, cancer, heart failure, chronic ... ...

    Abstract Muscle wasting disease indications are among the most debilitating and often deadly noncommunicable disease states. As a comorbidity, muscle wasting is associated with different neuromuscular diseases and myopathies, cancer, heart failure, chronic pulmonary and renal diseases, peripheral neuropathies, inflammatory disorders, and, of course, musculoskeletal injuries. Current treatment strategies are relatively ineffective and can at best only limit the rate of muscle degeneration. This includes nutritional supplementation and appetite stimulants as well as immunosuppressants capable of exacerbating muscle loss. Arguably, the most promising treatments in development attempt to disrupt myostatin and activin receptor signaling because these circulating factors are potent inhibitors of muscle growth and regulators of muscle progenitor cell differentiation. Indeed, several studies demonstrated the clinical potential of "inhibiting the inhibitors," increasing muscle cell protein synthesis, decreasing degradation, enhancing mitochondrial biogenesis, and preserving muscle function. Such changes can prevent muscle wasting in various disease animal models yet many drugs targeting this pathway failed during clinical trials, some from serious treatment-related adverse events and off-target interactions. More often, however, failures resulted from the inability to improve muscle function despite preserving muscle mass. Drugs still in development include antibodies and gene therapeutics, all with different targets and thus, safety, efficacy, and proposed use profiles. Each is unique in design and, if successful, could revolutionize the treatment of both acute and chronic muscle wasting. They could also be used in combination with other developing therapeutics for related muscle pathologies or even metabolic diseases.
    MeSH term(s) Activin Receptors/metabolism ; Activin Receptors/pharmacology ; Animals ; Humans ; Ligands ; Muscle, Skeletal/metabolism ; Muscular Atrophy/drug therapy ; Muscular Atrophy/metabolism ; Myostatin/genetics ; Myostatin/metabolism ; Peripheral Nervous System Diseases/metabolism ; Peripheral Nervous System Diseases/pathology
    Chemical Substances Ligands ; Myostatin ; Activin Receptors (EC 2.7.11.30)
    Language English
    Publishing date 2021-09-14
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 603096-8
    ISSN 1945-7189 ; 0163-769X
    ISSN (online) 1945-7189
    ISSN 0163-769X
    DOI 10.1210/endrev/bnab030
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Ryanodine Receptor Stabilization Therapy Suppresses Ca

    Kaplan, Aaron D / Boyman, Liron / Ward, Christopher W / Lederer, W Jonathan / Greiser, Maura

    bioRxiv : the preprint server for biology

    2024  

    Abstract: Heart Failure with preserved ejection fraction (HFpEF) is the most prevalent form of heart failure worldwide and its significant mortality is associated with a high rate of sudden cardiac death (SCD; 30% - 40%). Chronic metabolic stress is an important ... ...

    Abstract Heart Failure with preserved ejection fraction (HFpEF) is the most prevalent form of heart failure worldwide and its significant mortality is associated with a high rate of sudden cardiac death (SCD; 30% - 40%). Chronic metabolic stress is an important driver of HFpEF, and clinical data show metabolic stress as a significant risk factor for ventricular arrhythmias in HFpEF patients. The mechanisms of SCD and ventricular arrhythmia in HFpEF remain critically understudied and empirical treatment is ineffective. To address this important knowledge gap, we developed a novel preclinical model of metabolic-stress induced HFpEF using Western diet (High fructose and fat) and hypertension induced by nitric oxide synthase inhibition (with L-NAME) in wildtype C57BL6/J mice. After 5 months, mice display all clinical characteristics of HFpEF and present with stress-induced sustained ventricular tachycardia (VT). Mechanistically, we found a novel pattern of arrhythmogenic intracellular Ca
    Language English
    Publishing date 2024-01-25
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.06.21.544411
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Voltage sensor current, SR Ca

    Bibollet, Hugo / Nguyen, Elton L / Miranda, Daniel R / Ward, Christopher W / Voss, Andrew A / Schneider, Martin F / Hernández-Ochoa, Erick O

    Physiological reports

    2023  Volume 11, Issue 9, Page(s) e15675

    Abstract: In skeletal muscle, ... ...

    Abstract In skeletal muscle, Ca
    MeSH term(s) Mice ; Animals ; Action Potentials/physiology ; Muscle Fibers, Skeletal/physiology ; Muscle, Skeletal ; Excitation Contraction Coupling ; Calcium
    Chemical Substances Calcium (SY7Q814VUP)
    Language English
    Publishing date 2023-05-04
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2724325-4
    ISSN 2051-817X ; 2051-817X
    ISSN (online) 2051-817X
    ISSN 2051-817X
    DOI 10.14814/phy2.15675
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  4. Article: Na

    Karbowski, Mariusz / Boyman, Liron / Garber, Libet / Joca, Humberto C / Verhoeven, Nicolas / Coleman, Andrew K / Ward, Christopher W / Lederer, W Jonathan / Greiser, Maura

    bioRxiv : the preprint server for biology

    2023  

    Abstract: Background: The intracellular Na : Methods: Multicolor STORM super-resolution microscopy, Western Blot analyses, and in vivo examination of adrenergic regulation are employed to examine the organization and function of Na : Results: The NKAα1 ( ... ...

    Abstract Background: The intracellular Na
    Methods: Multicolor STORM super-resolution microscopy, Western Blot analyses, and in vivo examination of adrenergic regulation are employed to examine the organization and function of Na
    Results: The NKAα1 (NKAα1) and the L-type Ca
    Conclusions: NKAα1, Ca
    Language English
    Publishing date 2023-09-02
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.08.31.553598
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Optogenetic activation of muscle contraction

    Ganji, Elahe / Chan, C Savio / Ward, Christopher W / Killian, Megan L

    Connective tissue research

    2020  Volume 62, Issue 1, Page(s) 15–23

    Abstract: Purpose: Optogenetics is an emerging alternative to traditional electrical stimulation to initiate action potentials in activatable cells both ex vivo and in vivo. Optogenetics has been commonly used in mammalian neurons and more recently, it has been ... ...

    Abstract Purpose: Optogenetics is an emerging alternative to traditional electrical stimulation to initiate action potentials in activatable cells both ex vivo and in vivo. Optogenetics has been commonly used in mammalian neurons and more recently, it has been adapted for activation of cardiomyocytes and skeletal muscle. Therefore, the aim of this study was to evaluate the stimulation feasibility and sustain isometric muscle contraction and limit decay for an extended period of time (1s), using non-invasive transdermal light activation of skeletal muscle (triceps surae) in vivo.
    Materials and methods: We used inducible Cre recombination to target expression of Channelrhodopsin-2 (ChR2(H134R)-EYFP) in skeletal muscle (Acta1-Cre) in mice. Fluorescent imaging confirmed that ChR2 expression is localized in skeletal muscle and does not have specific expression in sciatic nerve branch, therefore, allowing for non-nerve mediated optical stimulation of skeletal muscle. We induced muscle contraction using transdermal exposure to blue light and selected 10 Hz stimulation after controlled optimization experiments to sustain prolonged muscle contraction.
    Results: Increasing the stimulation frequency from 10 Hz to 40 Hz increased the muscle contraction decay during prolonged 1s stimulation, highlighting frequency dependency and importance of membrane repolarization for effective light activation. Finally, we showed that optimized pulsed optogenetic stimulation of 10 Hz resulted in comparable ankle torque and contractile functionality to that of electrical stimulation.
    Conclusions: Our results demonstrate the feasibility and repeatability of non-invasive optogenetic stimulation of muscle in vivo and highlight optogenetic stimulation as a powerful tool for non-invasive in vivo direct activation of skeletal muscle.
    MeSH term(s) Animals ; Channelrhodopsins/genetics ; Light ; Mice ; Muscle Contraction ; Muscle, Skeletal ; Optogenetics
    Chemical Substances Channelrhodopsins
    Language English
    Publishing date 2020-08-10
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 185551-7
    ISSN 1607-8438 ; 0091-1690 ; 0300-8207
    ISSN (online) 1607-8438
    ISSN 0091-1690 ; 0300-8207
    DOI 10.1080/03008207.2020.1798943
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: X-ROS Signaling Depends on Length-Dependent Calcium Buffering by Troponin.

    Limbu, Sarita / Prosser, Benjamin L / Lederer, William J / Ward, Christopher W / Jafri, Mohsin S

    Cells

    2021  Volume 10, Issue 5

    Abstract: The stretching of a cardiomyocyte leads to the increased production of reactive oxygen species that increases ryanodine receptor open probability through a process termed X-ROS signaling. The stretching of the myocyte also increases the calcium affinity ... ...

    Abstract The stretching of a cardiomyocyte leads to the increased production of reactive oxygen species that increases ryanodine receptor open probability through a process termed X-ROS signaling. The stretching of the myocyte also increases the calcium affinity of myofilament Troponin C, which increases its calcium buffering capacity. Here, an integrative experimental and modeling study is pursued to explain the interplay of length-dependent changes in calcium buffering by troponin and stretch-activated X-ROS calcium signaling. Using this combination, we show that the troponin C-dependent increase in myoplasmic calcium buffering during myocyte stretching largely offsets the X-ROS-dependent increase in calcium release from the sarcoplasmic reticulum. The combination of modeling and experiment are further informed by the elimination of length-dependent changes to troponin C calcium binding in the presence of blebbistatin. Here, the model suggests that it is the X-ROS signaling-dependent Ca
    MeSH term(s) Animals ; Binding Sites ; Calcium/metabolism ; Calcium Signaling ; Cell Shape ; Excitation Contraction Coupling ; Ion Channel Gating ; Male ; Mechanotransduction, Cellular ; Models, Cardiovascular ; Myocardial Contraction ; Myocytes, Cardiac/metabolism ; Rats ; Rats, Sprague-Dawley ; Reactive Oxygen Species/metabolism ; Ryanodine Receptor Calcium Release Channel/metabolism ; Time Factors ; Troponin C/metabolism
    Chemical Substances Reactive Oxygen Species ; RyR2 protein, rat ; Ryanodine Receptor Calcium Release Channel ; Troponin C ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2021-05-13
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells10051189
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  7. Article ; Online: Aging, Osteo-Sarcopenia, and Musculoskeletal Mechano-Transduction.

    Leser, Jenna M / Harriot, Anicca / Buck, Heather V / Ward, Christopher W / Stains, Joseph P

    Frontiers in rehabilitation sciences

    2021  Volume 2

    Abstract: The decline in the mass and function of bone and muscle is an inevitable consequence of healthy aging with early onset and accelerated decline in those with chronic disease. Termed osteo-sarcopenia, this condition predisposes the decreased activity, ... ...

    Abstract The decline in the mass and function of bone and muscle is an inevitable consequence of healthy aging with early onset and accelerated decline in those with chronic disease. Termed osteo-sarcopenia, this condition predisposes the decreased activity, falls, low-energy fractures, and increased risk of co-morbid disease that leads to musculoskeletal frailty. The biology of osteo-sarcopenia is most understood in the context of systemic neuro-endocrine and immune/inflammatory alterations that drive inflammation, oxidative stress, reduced autophagy, and cellular senescence in the bone and muscle. Here we integrate these concepts to our growing understanding of how bone and muscle senses, responds and adapts to mechanical load. We propose that age-related alterations in cytoskeletal mechanics alter load-sensing and mechano-transduction in bone osteocytes and muscle fibers which underscores osteo-sarcopenia. Lastly, we examine the evidence for exercise as an effective countermeasure to osteo-sarcopenia.
    Language English
    Publishing date 2021-12-06
    Publishing country Switzerland
    Document type Journal Article
    ISSN 2673-6861
    ISSN (online) 2673-6861
    DOI 10.3389/fresc.2021.782848
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  8. Article ; Online: Tubulin acetylation increases cytoskeletal stiffness to regulate mechanotransduction in striated muscle.

    Coleman, Andrew K / Joca, Humberto C / Shi, Guoli / Lederer, W Jonathan / Ward, Christopher W

    The Journal of general physiology

    2021  Volume 153, Issue 7

    Abstract: Microtubules tune cytoskeletal stiffness, which affects cytoskeletal mechanics and mechanotransduction of striated muscle. While recent evidence suggests that microtubules enriched in detyrosinated α-tubulin regulate these processes in healthy muscle and ...

    Abstract Microtubules tune cytoskeletal stiffness, which affects cytoskeletal mechanics and mechanotransduction of striated muscle. While recent evidence suggests that microtubules enriched in detyrosinated α-tubulin regulate these processes in healthy muscle and increase them in disease, the possible contribution from several other α-tubulin modifications has not been investigated. Here, we used genetic and pharmacologic strategies in isolated cardiomyocytes and skeletal myofibers to increase the level of acetylated α-tubulin without altering the level of detyrosinated α-tubulin. We show that microtubules enriched in acetylated α-tubulin increase cytoskeletal stiffness and viscoelastic resistance. These changes slow rates of contraction and relaxation during unloaded contraction and increased activation of NADPH oxidase 2 (Nox2) by mechanotransduction. Together, these findings add to growing evidence that microtubules contribute to the mechanobiology of striated muscle in health and disease.
    MeSH term(s) Acetylation ; Mechanotransduction, Cellular ; Microtubules/metabolism ; Muscle, Striated/metabolism ; Tubulin/metabolism ; Tyrosine/metabolism
    Chemical Substances Tubulin ; Tyrosine (42HK56048U)
    Language English
    Publishing date 2021-03-18
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3118-5
    ISSN 1540-7748 ; 0022-1295
    ISSN (online) 1540-7748
    ISSN 0022-1295
    DOI 10.1085/jgp.202012743
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  9. Article ; Online: Structure before function: myosin binding protein-C slow is a structural protein with regulatory properties.

    Geist, Janelle / Ward, Christopher W / Kontrogianni-Konstantopoulos, Aikaterini

    FASEB journal : official publication of the Federation of American Societies for Experimental Biology

    2018  , Page(s) fj201800624R

    Abstract: Myosin binding protein-C slow (sMyBP-C) comprises a family of accessory proteins in skeletal muscles that bind both myosin and actin filaments. Herein, we examined the role of sMyBP-C in adult skeletal muscles using in vivo gene transfer and clustered ... ...

    Abstract Myosin binding protein-C slow (sMyBP-C) comprises a family of accessory proteins in skeletal muscles that bind both myosin and actin filaments. Herein, we examined the role of sMyBP-C in adult skeletal muscles using in vivo gene transfer and clustered regularly interspaced short palindromic repeats technology to knock down all known sMyBP-C variants. Our findings, confirmed in two different skeletal muscles, demonstrated efficient knockdown (KD) of sMyBP-C (>70%) resulting in notably decreased levels of thick, but not thin, filament proteins ranging from ∼50% for slow and fast myosin to ∼20% for myomesin. Consistent with this, A bands were selectively distorted, and sarcomere length was significantly reduced. Contrary to earlier in vitro studies showing that addition of recombinant sMyBP-C slows down the formation of actomyosin crossbridges, our work demonstrates that KD of sMyBP-C in intact myofibers results in decreased contraction and relaxation kinetics under no-load conditions. Similarly, KD muscles develop markedly reduced twitch and tetanic force and contraction velocity. Taken together, our results show that sMyBP-C is essential for the regular organization and maintenance of myosin filaments into A bands and that its structural role precedes its ability to regulate actomyosin crossbridges.-Geist, J., Ward, C. W., Kontrogianni-Konstantopoulos, A. Structure before function: myosin binding protein-C slow is a structural protein with regulatory properties.
    Language English
    Publishing date 2018-06-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 639186-2
    ISSN 1530-6860 ; 0892-6638
    ISSN (online) 1530-6860
    ISSN 0892-6638
    DOI 10.1096/fj.201800624R
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Mechano-chemo transduction tunes the heartstrings.

    Prosser, Benjamin L / Ward, Christopher W

    Science signaling

    2014  Volume 7, Issue 317, Page(s) pe7

    Abstract: In the beating heart, mechanical stretch triggers the production of reactive oxygen or nitrogen species that target Ca(2+)-signaling proteins. Termed mechano-chemo transduction, this pathway "tunes" the calcium release machinery in the healthy heart; ... ...

    Abstract In the beating heart, mechanical stretch triggers the production of reactive oxygen or nitrogen species that target Ca(2+)-signaling proteins. Termed mechano-chemo transduction, this pathway "tunes" the calcium release machinery in the healthy heart; when dysregulated, it contributes to disease. In this issue of Science Signaling, Jian et al. used a "cell-in-gel" method to show that contractions in healthy heart cells elicit a steep, viscosity-dependent increase in mechano-chemo transduction in which nitric oxide synthase (NOS), NADPH oxidase 2 (Nox2), and Ca(2+)/calmodulin-dependent kinase II (CaMKII) contribute. These authors provide evidence for a role of neuronal NOS (nNOS) over endothelial NOS; they supported their findings with super-resolution microscopy, which localized nNOS nearest to the Ca(2+) release sites. In a disease model, signaling through nNOS and CaMKII rather than through Nox2 was enhanced, supporting the independent mechano-activation of these enzymes. The coupling of these quantitative approaches will provide a new understanding of mechano-chemo transduction.
    MeSH term(s) Animals ; Mechanotransduction, Cellular ; Myocytes, Cardiac/cytology ; Nitric Oxide/metabolism ; Signal Transduction
    Chemical Substances Nitric Oxide (31C4KY9ESH)
    Language English
    Publishing date 2014-03-18
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 2417226-1
    ISSN 1937-9145 ; 1945-0877
    ISSN (online) 1937-9145
    ISSN 1945-0877
    DOI 10.1126/scisignal.2005214
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