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Zoico E, Saatchi T, Nori N, Mazzali G, Rizzatti V, Pizzi E, Fantin F, Giani A, Urbani S, Zamboni M. Senescent adipocytes as potential effectors of muscle cells dysfunction: An in vitro model. Exp Gerontol 2023; 179:112233. [PMID: 37321332 DOI: 10.1016/j.exger.2023.112233] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 05/31/2023] [Accepted: 06/11/2023] [Indexed: 06/17/2023]
Abstract
Recently, there has been a growing body of evidence showing a negative effect of the white adipose tissue (WAT) dysfunction on the skeletal muscle function and quality. However, little is known about the effects of senescent adipocytes on muscle cells. Therefore, to explore potential mechanisms involved in age-related loss of muscle mass and function, we performed an in vitro experiment using conditioned medium obtained from cultures of mature and aged 3 T3-L1 adipocytes, as well as from cultures of dysfunctional adipocytes exposed to oxidative stress or high insulin doses, to treat C2C12 myocytes. The results from morphological measures indicated a significant decrease in diameter and fusion index of myotubes after treatment with medium of aged or stressed adipocytes. Aged and stressed adipocytes presented different morphological characteristics as well as a different gene expression profile of proinflammatory cytokines and ROS production. In myocytes treated with different adipocytes' conditioned media, we demonstrated a significant reduction of gene expression of myogenic differentiation markers as well as a significant increase of genes involved in atrophy. Finally, a significant reduction in protein synthesis as well as a significant increase of myostatin was found in muscle cells treated with medium of aged or stressed adipocytes compared to controls. In conclusion, these preliminary results suggest that aged adipocytes could influence negatively trophism, function and regenerative capacity of myocytes by a paracrine network of signaling.
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Affiliation(s)
- Elena Zoico
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy
| | - Tanaz Saatchi
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy.
| | - Nicole Nori
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy
| | - Gloria Mazzali
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy
| | - Vanni Rizzatti
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy
| | - Eleonora Pizzi
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy
| | - Francesco Fantin
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy
| | - Anna Giani
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy
| | - Silvia Urbani
- Department of Medicine, Geriatric Section, University of Verona, Verona, Italy
| | - Mauro Zamboni
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy
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Valduga AH, Mizobuti DS, Moraes FDSR, Mâncio RD, Moraes LHR, Hermes TDA, Macedo AB, Minatel E. Protection of dystrophic muscle cells using Idebenone correlates with the interplay between calcium, oxidative stress and inflammation. Int J Exp Pathol 2023; 104:4-12. [PMID: 36565155 PMCID: PMC9845605 DOI: 10.1111/iep.12463] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 08/25/2022] [Revised: 11/18/2022] [Accepted: 11/24/2022] [Indexed: 12/25/2022] Open
Abstract
There is strong cross-talk between abnormal intracellular calcium concentration, high levels of reactive oxygen species (ROS) and an exacerbated inflammatory process in the dystrophic muscles of mdx mice, the experimental model of Duchenne muscular dystrophy (DMD). In this study, we investigated effects of Idebenone, a potent anti-oxidant, on oxidative stress markers, the anti-oxidant defence system, intracellular calcium concentrations and the inflammatory process in primary dystrophic muscle cells from mdx mice. Dystrophic muscle cells were treated with Idebenone (0.05 μM) for 24 h. The untreated mdx muscle cells were used as controls. The MTT assay showed that Idebenone did not have a cytotoxic effect on the dystrophic muscle cells. The Idebenone treatment was able to reduce the levels of oxidative stress markers, such as H2 O2 and 4-HNE, as well as decreasing intracellular calcium influx in the dystrophic muscle cells. Regarding Idebenone effects on the anti-oxidant defence system, an up-regulation of catalase levels, glutathione reductase (GR), glutathione peroxidase (GPx) and superoxide dismutase (SOD) activity was observed in the dystrophic muscle cells. In addition, the Idebenone treatment was also associated with reduction in inflammatory molecules, such as nuclear factor kappa-B (NF-κB) and tumour necrosis factor (TNF) in mdx muscle cells. These outcomes supported the use of Idebenone as a protective agent against oxidative stress and related signalling mechanisms involved in dystrophinopathies, such as DMD.
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Affiliation(s)
- Amanda Harduim Valduga
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Daniela Sayuri Mizobuti
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Fernanda dos Santos Rapucci Moraes
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Rafael Dias Mâncio
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Luis Henrique Rapucci Moraes
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Túlio de Almeida Hermes
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Aline Barbosa Macedo
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
| | - Elaine Minatel
- Departamento de Biologia Estrutural e Funcional, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasSao PauloBrazil
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Ashoti A, Limone F, van Kranenburg M, Alemany A, Baak M, Vivié J, Piccioni F, Dijkers PF, Creyghton M, Eggan K, Geijsen N. Considerations and practical implications of performing a phenotypic CRISPR/Cas survival screen. PLoS One 2022; 17:e0263262. [PMID: 35176052 PMCID: PMC8853573 DOI: 10.1371/journal.pone.0263262] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 01/17/2022] [Indexed: 12/26/2022] Open
Abstract
Genome-wide screens that have viability as a readout have been instrumental to identify essential genes. The development of gene knockout screens with the use of CRISPR-Cas has provided a more sensitive method to identify these genes. Here, we performed an exhaustive genome-wide CRISPR/Cas9 phenotypic rescue screen to identify modulators of cytotoxicity induced by the pioneer transcription factor, DUX4. Misexpression of DUX4 due to a failure in epigenetic repressive mechanisms underlies facioscapulohumeral muscular dystrophy (FHSD), a complex muscle disorder that thus far remains untreatable. As the name implies, FSHD generally starts in the muscles of the face and shoulder girdle. Our CRISPR/Cas9 screen revealed no key effectors other than DUX4 itself that could modulate DUX4 cytotoxicity, suggesting that treatment efforts in FSHD should be directed towards direct modulation of DUX4 itself. Our screen did however reveal some rare and unexpected genomic events, that had an important impact on the interpretation of our data. Our findings may provide important considerations for planning future CRISPR/Cas9 phenotypic survival screens.
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MESH Headings
- CRISPR-Cas Systems
- Cell Survival
- Gene Expression Regulation
- Homeodomain Proteins/antagonists & inhibitors
- Homeodomain Proteins/genetics
- Homeodomain Proteins/metabolism
- Humans
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Muscle Cells/metabolism
- Muscle Cells/pathology
- Muscular Dystrophy, Facioscapulohumeral/genetics
- Muscular Dystrophy, Facioscapulohumeral/metabolism
- Muscular Dystrophy, Facioscapulohumeral/pathology
- Myoblasts/metabolism
- Myoblasts/pathology
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Affiliation(s)
- Ator Ashoti
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
- * E-mail: (AA); (FL); (NG); (KE)
| | - Francesco Limone
- Department of Stem Cell and Regenerative Biology, Harvard University Cambridge, MA, United States of America
- Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, United States of America
- * E-mail: (AA); (FL); (NG); (KE)
| | - Melissa van Kranenburg
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
| | - Anna Alemany
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
| | - Mirna Baak
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
| | - Judith Vivié
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
- Single Cell Discoveries, Utrecht, The Netherlands
| | | | - Pascale F. Dijkers
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
| | - Menno Creyghton
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
| | - Kevin Eggan
- Department of Stem Cell and Regenerative Biology, Harvard University Cambridge, MA, United States of America
- Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, United States of America
- * E-mail: (AA); (FL); (NG); (KE)
| | - Niels Geijsen
- Hubrecht Institute, Developmental Biology and Stem Cell Research, Utrecht, The Netherlands
- * E-mail: (AA); (FL); (NG); (KE)
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Boros-Rausch A, Shynlova O, Lye SJ. A Broad-Spectrum Chemokine Inhibitor Blocks Inflammation-Induced Myometrial Myocyte-Macrophage Crosstalk and Myometrial Contraction. Cells 2021; 11:cells11010128. [PMID: 35011690 PMCID: PMC8750067 DOI: 10.3390/cells11010128] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/28/2021] [Accepted: 12/30/2021] [Indexed: 01/10/2023] Open
Abstract
Prophylactic administration of the broad-spectrum chemokine inhibitor (BSCI) FX125L has been shown to suppress uterine contraction, prevent preterm birth (PTB) induced by Group B Streptococcus in nonhuman primates, and inhibit uterine cytokine/chemokine expression in a murine model of bacterial endotoxin (LPS)-induced PTB. This study aimed to determine the mechanism(s) of BSCI action on human myometrial smooth muscle cells. We hypothesized that BSCI prevents infection-induced contraction of uterine myocytes by inhibiting the secretion of pro-inflammatory cytokines, the expression of contraction-associated proteins and disruption of myocyte interaction with tissue macrophages. Myometrial biopsies and peripheral blood were collected from women at term (not in labour) undergoing an elective caesarean section. Myocytes were isolated and treated with LPS with/out BSCI; conditioned media was collected; cytokine secretion was analyzed by ELISA; and protein expression was detected by immunoblotting and immunocytochemistry. Functional gap junction formation was assessed by parachute assay. Collagen lattices were used to examine myocyte contraction with/out blood-derived macrophages and BSCI. We found that BSCI inhibited (1) LPS-induced activation of transcription factor NF-kB; (2) secretion of chemokines (MCP-1/CCL2 and IL-8/CXCL8); (3) Connexin43-mediated intercellular connectivity, thereby preventing myocyte–macrophage crosstalk; and (4) myocyte contraction. BSCI represents novel therapeutics for prevention of inflammation-induced PTB in women.
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Affiliation(s)
- Adam Boros-Rausch
- Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Suite 6-1017, Toronto, ON M5G 1X5, Canada; (A.B.-R.); (S.J.L.)
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A1, Canada
| | - Oksana Shynlova
- Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Suite 6-1017, Toronto, ON M5G 1X5, Canada; (A.B.-R.); (S.J.L.)
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A1, Canada
- Department of Obstetrics & Gynecology, University of Toronto, Toronto, ON M5S 1A1, Canada
- Correspondence: ; Tel.: +1-416-586-4800 (ext. 5635); Fax: +1-416-586-5116
| | - Stephen James Lye
- Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Suite 6-1017, Toronto, ON M5G 1X5, Canada; (A.B.-R.); (S.J.L.)
- Department of Physiology, University of Toronto, Toronto, ON M5S 1A1, Canada
- Department of Obstetrics & Gynecology, University of Toronto, Toronto, ON M5S 1A1, Canada
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Catteau M, Passerieux E, Blervaque L, Gouzi F, Ayoub B, Hayot M, Pomiès P. Response to Electrostimulation Is Impaired in Muscle Cells from Patients with Chronic Obstructive Pulmonary Disease. Cells 2021; 10:3002. [PMID: 34831227 PMCID: PMC8616440 DOI: 10.3390/cells10113002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 10/27/2021] [Accepted: 10/31/2021] [Indexed: 11/16/2022] Open
Abstract
Among the comorbidities associated with chronic obstructive pulmonary disease (COPD), skeletal muscle weakness and atrophy are known to affect patient survival rate. In addition to muscle deconditioning, various systemic and intrinsic factors have been implicated in COPD muscle dysfunction but an impaired COPD muscle adaptation to contraction has never been extensively studied. We submitted cultured myotubes from nine healthy subjects and nine patients with COPD to an endurance-type protocol of electrical pulse stimulation (EPS). EPS induced a decrease in the diameter, covered surface and expression of MHC1 in COPD myotubes. Although the expression of protein degradation markers was not affected, expression of the protein synthesis marker mTOR was not induced in COPD compared to healthy myotubes after EPS. The expression of the differentiation markers p16INK4a and p21 was impaired, while expression of Myf5 and MyoD tended to be affected in COPD muscle cells in response to EPS. The expression of mitochondrial biogenesis markers PGC1α and MFN2 was affected and expression of TFAM and COX1 tended to be reduced in COPD compared to healthy myotubes upon EPS. Lipid peroxidation was increased and the expression of the antioxidant enzymes SOD2 and GPx4 was affected in COPD compared to healthy myotubes in response to EPS. Thus, we provide evidence of an impaired response of COPD muscle cells to contraction, which might be involved in the muscle weakness observed in patients with COPD.
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Affiliation(s)
- Matthias Catteau
- PhyMedExp, University of Montpellier—INSERM—CNRS, 34295 Montpellier, France; (M.C.); (E.P.); (L.B.)
| | - Emilie Passerieux
- PhyMedExp, University of Montpellier—INSERM—CNRS, 34295 Montpellier, France; (M.C.); (E.P.); (L.B.)
| | - Léo Blervaque
- PhyMedExp, University of Montpellier—INSERM—CNRS, 34295 Montpellier, France; (M.C.); (E.P.); (L.B.)
| | - Farés Gouzi
- PhyMedExp, University of Montpellier—INSERM—CNRS—CHRU Montpellier, 34295 Montpellier, France; (F.G.); (B.A.); (M.H.)
| | - Bronia Ayoub
- PhyMedExp, University of Montpellier—INSERM—CNRS—CHRU Montpellier, 34295 Montpellier, France; (F.G.); (B.A.); (M.H.)
| | - Maurice Hayot
- PhyMedExp, University of Montpellier—INSERM—CNRS—CHRU Montpellier, 34295 Montpellier, France; (F.G.); (B.A.); (M.H.)
| | - Pascal Pomiès
- PhyMedExp, University of Montpellier—INSERM—CNRS, 34295 Montpellier, France; (M.C.); (E.P.); (L.B.)
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Prados B, Del Toro R, MacGrogan D, Gómez-Apiñániz P, Papoutsi T, Muñoz-Cánoves P, Méndez-Ferrer S, de la Pompa JL. Heterotopic ossification in mice overexpressing Bmp2 in Tie2+ lineages. Cell Death Dis 2021; 12:729. [PMID: 34294700 PMCID: PMC8298441 DOI: 10.1038/s41419-021-04003-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 12/29/2022]
Abstract
Bone morphogenetic protein (Bmp) signaling is critical for organismal development and homeostasis. To elucidate Bmp2 function in the vascular/hematopoietic lineages we generated a new transgenic mouse line in which ectopic Bmp2 expression is controlled by the Tie2 promoter. Tie2CRE/+;Bmp2tg/tg mice develop aortic valve dysfunction postnatally, accompanied by pre-calcific lesion formation in valve leaflets. Remarkably, Tie2CRE/+;Bmp2tg/tg mice develop extensive soft tissue bone formation typical of acquired forms of heterotopic ossification (HO) and genetic bone disorders, such as Fibrodysplasia Ossificans Progressiva (FOP). Ectopic ossification in Tie2CRE/+;Bmp2tg/tg transgenic animals is accompanied by increased bone marrow hematopoietic, fibroblast and osteoblast precursors and circulating pro-inflammatory cells. Transplanting wild-type bone marrow hematopoietic stem cells into lethally irradiated Tie2CRE/+;Bmp2tg/tg mice significantly delays HO onset but does not prevent it. Moreover, transplanting Bmp2-transgenic bone marrow into wild-type recipients does not result in HO, but hematopoietic progenitors contribute to inflammation and ectopic bone marrow colonization rather than to endochondral ossification. Conversely, aberrant Bmp2 signaling activity is associated with fibroblast accumulation, skeletal muscle fiber damage, and expansion of a Tie2+ fibro-adipogenic precursor cell population, suggesting that ectopic bone derives from a skeletal muscle resident osteoprogenitor cell origin. Thus, Tie2CRE/+;Bmp2tg/tg mice recapitulate HO pathophysiology, and might represent a useful model to investigate therapies seeking to mitigate disorders associated with aberrant extra-skeletal bone formation.
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Affiliation(s)
- Belén Prados
- Intercellular Signaling in Cardiovascular Development & Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, 28029, Madrid, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
| | - Raquel Del Toro
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
- Cardiovascular Physiophatology group, Instituto de Biomedicina de Sevilla-IBIS, (Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla). Manuel Siurot, s/n, 41013, Sevilla, Spain
| | - Donal MacGrogan
- Intercellular Signaling in Cardiovascular Development & Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, 28029, Madrid, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
| | - Paula Gómez-Apiñániz
- Intercellular Signaling in Cardiovascular Development & Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, 28029, Madrid, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
| | - Tania Papoutsi
- Intercellular Signaling in Cardiovascular Development & Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, 28029, Madrid, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
| | - Pura Muñoz-Cánoves
- Tissue Regeneration Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
- Department of Experimental & Health Sciences, Universidad Pompeu Fabra (UPF), ICREA and CIBERNED, Dr. Aiguader 88, Barcelona, Spain
| | - Simón Méndez-Ferrer
- Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute and Department of Haematology, University of Cambridge, and National Health Service Blood and Transplant, Cambridge Biomedical Campus, Cambridge, CB2 0AW, UK
- National Health Service Blood and Transplant, Cambridge Biomedical Campus, Cambridge, CB2 0PT, UK
| | - José Luis de la Pompa
- Intercellular Signaling in Cardiovascular Development & Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, 28029, Madrid, Spain.
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain.
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Legros V, Jeannin P, Burlaud-Gaillard J, Chaze T, Gianetto QG, Butler-Browne G, Mouly V, Zoladek J, Afonso PV, Gonzàlez MN, Matondo M, Riederer I, Roingeard P, Gessain A, Choumet V, Ceccaldi PE. Differentiation-dependent susceptibility of human muscle cells to Zika virus infection. PLoS Negl Trop Dis 2020; 14:e0008282. [PMID: 32817655 PMCID: PMC7508361 DOI: 10.1371/journal.pntd.0008282] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/22/2020] [Accepted: 04/09/2020] [Indexed: 11/27/2022] Open
Abstract
Muscle cells are potential targets of many arboviruses, such as Ross River, Dengue, Sindbis, and chikungunya viruses, that may be involved in the physiopathological course of the infection. During the recent outbreak of Zika virus (ZIKV), myalgia was one of the most frequently reported symptoms. We investigated the susceptibility of human muscle cells to ZIKV infection. Using an in vitro model of human primary myoblasts that can be differentiated into myotubes, we found that myoblasts can be productively infected by ZIKV. In contrast, myotubes were shown to be resistant to ZIKV infection, suggesting a differentiation-dependent susceptibility. Infection was accompanied by a caspase-independent cytopathic effect, associated with paraptosis-like cytoplasmic vacuolization. Proteomic profiling was performed 24h and 48h post-infection in cells infected with two different isolates. Proteome changes indicate that ZIKV infection induces an upregulation of proteins involved in the activation of the Interferon type I pathway, and a downregulation of protein synthesis. This work constitutes the first observation of primary human muscle cells susceptibility to ZIKV infection, and differentiation-dependent restriction of infection from myoblasts to myotubes. Since myoblasts constitute the reservoir of stem cells involved in reparation/regeneration in muscle tissue, the infection of muscle cells and the viral-induced alterations observed here could have consequences in ZIKV infection pathogenesis. Muscle cells are potential targets of many arboviruses, such as Ross River, Dengue, Sindbis, and chikungunya viruses, and may be involved in the disease manifestation. During the recent outbreak of Zika virus (ZIKV), myalgia was one of the most frequently reported symptoms. We investigated the susceptibility of human muscle cells to ZIKV infection. Using an in vitro model of human muscle stem cells (myoblasts) that can be differentiated into differentiated muscle cells (myotubes), we found that myoblasts can be infected by ZIKV. In contrast, myotubes were shown to be resistant to ZIKV infection. Infection induced the death of infected cells. Protein levels 24h and 48h post-infection indicate that ZIKV infection induces an upregulation of proteins involved in the activation of the Interferon type I pathway, and a downregulation of protein synthesis. This work constitutes the first observation of primary human muscle cells susceptibility to ZIKV infection, muscle stem cells being susceptible while differentiated muscle cells are resistant. Since myoblasts constitute the reservoir of stem cells involved in reparation/regeneration in muscle tissue, the infection of muscle cells and the viral-induced alterations observed here could have consequences during ZIKV infection.
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Affiliation(s)
- Vincent Legros
- Unité Epidémiologie et Physiopathologie des Virus Oncogènes, Département de virologie, Institut Pasteur, Paris, France
- Université de Paris, Paris, France
- UMR CNRS 3569, Paris, France
| | - Patricia Jeannin
- Unité Epidémiologie et Physiopathologie des Virus Oncogènes, Département de virologie, Institut Pasteur, Paris, France
- Université de Paris, Paris, France
- UMR CNRS 3569, Paris, France
| | - Julien Burlaud-Gaillard
- INSERM U1259 & Plate Forme IBiSA de Microscopie Electronique, Université François Rabelais and CHRU, Tours, France
| | - Thibault Chaze
- Proteomics Platform, Mass Spectrometry for Biology Unit, USR 2000 IP CNRS, Institut Pasteur, Paris, France
| | - Quentin Giai Gianetto
- Proteomics Platform, Mass Spectrometry for Biology Unit, USR 2000 IP CNRS, Institut Pasteur, Paris, France
- Bioinformatics and Biostatistics Hub, C3BI, USR 3756 IP CNRS, Institut Pasteur, Paris, France
| | - Gillian Butler-Browne
- Sorbonne Université, Institut National de la Santé et de la Recherche Médicale, Association Institut de Myologie, Centre de Recherche en Myologie, UMRS974, Paris, France
| | - Vincent Mouly
- Sorbonne Université, Institut National de la Santé et de la Recherche Médicale, Association Institut de Myologie, Centre de Recherche en Myologie, UMRS974, Paris, France
| | - Jim Zoladek
- Unité Epidémiologie et Physiopathologie des Virus Oncogènes, Département de virologie, Institut Pasteur, Paris, France
- Université de Paris, Paris, France
- UMR CNRS 3569, Paris, France
| | - Philippe V. Afonso
- Unité Epidémiologie et Physiopathologie des Virus Oncogènes, Département de virologie, Institut Pasteur, Paris, France
- Université de Paris, Paris, France
- UMR CNRS 3569, Paris, France
| | - Mariela-Natacha Gonzàlez
- Laboratory on Thymus Research, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Brazilian National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM), Rio de Janeiro, Brazil
| | - Mariette Matondo
- Proteomics Platform, Mass Spectrometry for Biology Unit, USR 2000 IP CNRS, Institut Pasteur, Paris, France
| | - Ingo Riederer
- Laboratory on Thymus Research, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Brazilian National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM), Rio de Janeiro, Brazil
| | - Philippe Roingeard
- INSERM U1259 & Plate Forme IBiSA de Microscopie Electronique, Université François Rabelais and CHRU, Tours, France
| | - Antoine Gessain
- Unité Epidémiologie et Physiopathologie des Virus Oncogènes, Département de virologie, Institut Pasteur, Paris, France
- Université de Paris, Paris, France
- UMR CNRS 3569, Paris, France
| | - Valérie Choumet
- Unité Environnement et Risques Infectieux, Département de santé globale, Institut Pasteur, Paris, France
- * E-mail: (VC); (PEC)
| | - Pierre-Emmanuel Ceccaldi
- Unité Epidémiologie et Physiopathologie des Virus Oncogènes, Département de virologie, Institut Pasteur, Paris, France
- Université de Paris, Paris, France
- UMR CNRS 3569, Paris, France
- * E-mail: (VC); (PEC)
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Mensch A, Zierz S. Cellular Stress in the Pathogenesis of Muscular Disorders-From Cause to Consequence. Int J Mol Sci 2020; 21:ijms21165830. [PMID: 32823799 PMCID: PMC7461575 DOI: 10.3390/ijms21165830] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/07/2020] [Accepted: 08/11/2020] [Indexed: 02/07/2023] Open
Abstract
Cellular stress has been considered a relevant pathogenetic factor in a variety of human diseases. Due to its primary functions by means of contractility, metabolism, and protein synthesis, the muscle cell is faced with continuous changes of cellular homeostasis that require rapid and coordinated adaptive mechanisms. Hence, a prone susceptibility to cellular stress in muscle is immanent. However, studies focusing on the cellular stress response in muscular disorders are limited. While in recent years there have been emerging indications regarding a relevant role of cellular stress in the pathophysiology of several muscular disorders, the underlying mechanisms are to a great extent incompletely understood. This review aimed to summarize the available evidence regarding a deregulation of the cellular stress response in individual muscle diseases. Potential mechanisms, as well as involved pathways are critically discussed, and respective disease models are addressed. Furthermore, relevant therapeutic approaches that aim to abrogate defects of cellular stress response in muscular disorders are outlined.
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Abstract
As a member of the class IIa histone deacetylases (HDACs), HDAC9 catalyzes the deacetylation of histones and transcription factors, commonly leading to the suppression of gene transcription. The activity of HDAC9 is regulated transcriptionally and post-translationally. HDAC9 is known to play an essential role in regulating myocyte and adipocyte differentiation and cardiac muscle development. Also, recent studies have suggested that HDAC9 is involved in the pathogenesis of chronic diseases, including cardiovascular diseases, osteoporosis, autoimmune disease, cancer, obesity, insulin resistance, and liver fibrosis. HDAC9 modulates the expression of genes related to the pathogenesis of chronic diseases by altering chromatin structure in their promotor region or reducing the transcriptional activity of their respective transcription factors. This review summarizes the current knowledge of the regulation of HDAC9 expression and activity. Also, the roles of HDAC9 in the pathogenesis of chronic diseases are discussed, along with potential underlying mechanisms.
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Affiliation(s)
- Siqi Hu
- Department of Nutritional Sciences, University of Connecticut, Storrs, CT, USA
| | - Eun Hee Cho
- Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea
| | - Ji Young Lee
- Department of Nutritional Sciences, University of Connecticut, Storrs, CT, USA.
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10
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Xi XY, Zhang F, Wang J, Gao W, Tian Y, Xu H, Xu M, Wang Y, Yang MF. Functional significance of post-myocardial infarction inflammation evaluated by 18F-fluorodeoxyglucose imaging in swine model. J Nucl Cardiol 2020; 27:519-531. [PMID: 31741330 DOI: 10.1007/s12350-019-01952-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Accepted: 10/25/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND The aim of the study was to investigate the relationship between post-myocardial infarction (MI) inflammation and left ventricular (LV) remodeling in a swine model by 18F-fluorodeoxyglucose (FDG) imaging. METHODS MI was induced in swine by balloon occlusion of the left anterior descending coronary artery. A series of FDG positron emission tomography (PET) images were taken within 2 weeks post-MI, employing a comprehensive strategy to suppress the physiological uptake of cardiomyocytes. Echocardiography was applied to evaluate LV volume, global and regional function. CD68+ macrophage and glucose transporters (GLUT-1, -3 and -4) were investigated by immunostaining. RESULTS The physiological uptake of myocardium was adequately suppressed in 92.3% of PET scans verified by visual analysis, which was further confirmed by the minimal expression of myocardial GLUT-4. Higher FDG uptake was observed in the infarct than in the remote area and persisted within the observational period of 2 weeks. The FDG uptake of infarcted myocardium on day 1 post-MI was correlated with LV global remodeling, and the FDG uptake of infarcted myocardium on days 1 and 8 post-MI had a trend of correlating with regional remodeling of the infarct area. CONCLUSIONS We here report a feasible swine model for investigating post-MI inflammation. FDG signal in the infarct area of swine persisted for a longer duration than has been reported in small animals. FDG activity in the infarct area could predict LV remodeling.
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Affiliation(s)
- Xiao-Ying Xi
- Department of Nuclear Medicine, Beijing Chaoyang Hospital, Capital Medical University, 8th Gongtinanlu Rd, Chaoyang District, Beijing, 100020, China
| | - Feifei Zhang
- Department of Nuclear Medicine, The Third Affiliated Hospital of Soochow University, No. 185, Juqian Street, Changzhou, 213003, Jiangsu, China
| | - Jianfeng Wang
- Department of Nuclear Medicine, The Third Affiliated Hospital of Soochow University, No. 185, Juqian Street, Changzhou, 213003, Jiangsu, China
| | - Wei Gao
- Department of Ultrasound, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Yi Tian
- Department of Nuclear Medicine, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Hongyu Xu
- Department of Pathology, Fuwai Hospital, The National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Min Xu
- Department of Echocardiogram, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu, China
| | - Yuetao Wang
- Department of Nuclear Medicine, The Third Affiliated Hospital of Soochow University, No. 185, Juqian Street, Changzhou, 213003, Jiangsu, China.
| | - Min-Fu Yang
- Department of Nuclear Medicine, Beijing Chaoyang Hospital, Capital Medical University, 8th Gongtinanlu Rd, Chaoyang District, Beijing, 100020, China.
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Batlle C, Yang P, Coughlin M, Messing J, Pesarrodona M, Szulc E, Salvatella X, Kim HJ, Taylor JP, Ventura S. hnRNPDL Phase Separation Is Regulated by Alternative Splicing and Disease-Causing Mutations Accelerate Its Aggregation. Cell Rep 2020; 30:1117-1128.e5. [PMID: 31995753 PMCID: PMC6996132 DOI: 10.1016/j.celrep.2019.12.080] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 11/12/2019] [Accepted: 12/19/2019] [Indexed: 12/14/2022] Open
Abstract
Prion-like proteins form multivalent assemblies and phase separate into membraneless organelles. Heterogeneous ribonucleoprotein D-like (hnRNPDL) is a RNA-processing prion-like protein with three alternative splicing (AS) isoforms, which lack none, one, or both of its two disordered domains. It has been suggested that AS might regulate the assembly properties of RNA-processing proteins by controlling the incorporation of multivalent disordered regions in the isoforms. This, in turn, would modulate their activity in the downstream splicing program. Here, we demonstrate that AS controls the phase separation of hnRNPDL, as well as the size and dynamics of its nuclear complexes, its nucleus-cytoplasm shuttling, and amyloidogenicity. Mutation of the highly conserved D378 in the disordered C-terminal prion-like domain of hnRNPDL causes limb-girdle muscular dystrophy 1G. We show that D378H/N disease mutations impact hnRNPDL assembly properties, accelerating aggregation and dramatically reducing the protein solubility in the muscle of Drosophila, suggesting a genetic loss-of-function mechanism for this muscular disorder.
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Affiliation(s)
- Cristina Batlle
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autónoma de Barcelona, Bellaterra 08193, Spain
| | - Peiguo Yang
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Maura Coughlin
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - James Messing
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Howard Hughes Medical Institute, Chevy Chase, MD 201815, USA
| | - Mireia Pesarrodona
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain; Joint BSC-IRB Research Programme in Computational Biology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Elzbieta Szulc
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain; Joint BSC-IRB Research Programme in Computational Biology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Xavier Salvatella
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain; Joint BSC-IRB Research Programme in Computational Biology, Baldiri Reixac 10, 08028 Barcelona, Spain; ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | - Hong Joo Kim
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - J Paul Taylor
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Howard Hughes Medical Institute, Chevy Chase, MD 201815, USA.
| | - Salvador Ventura
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autónoma de Barcelona, Bellaterra 08193, Spain.
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Chang E. 1,25-Dihydroxyvitamin D Decreases Tertiary Butyl-Hydrogen Peroxide-Induced Oxidative Stress and Increases AMPK/SIRT1 Activation in C2C12 Muscle Cells. Molecules 2019; 24:molecules24213903. [PMID: 31671915 PMCID: PMC6864759 DOI: 10.3390/molecules24213903] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/22/2019] [Accepted: 10/28/2019] [Indexed: 01/21/2023] Open
Abstract
Enhanced oxidative stress has been associated with muscle mitochondrial changes and metabolic disorders. Thus, it might be a good strategy to decrease oxidative stress and improve mitochondrial changes in skeletal muscle. In the present study, we investigate the role of the most biologically active metabolite of vitamin D, 1,25-dihyroxyvitamin D (1,25(OH)2D) in oxidative stress and mitochondrial changes in tertiary butyl-hydrogen (tBHP)-treated C2C12 muscle cells. Differentiated C2C12 muscle cells were pretreated with tBHP, followed by 1,25(OH)2D for additional 24 h. An exogenous inducer of oxidative stress, tBHP significantly increased oxidative stress, lipid peroxidation, intracellular damage, and cell death which were reversed by 1,25(OH)2D in C2C12 myotubes. 1.25(OH)2D improves tBHP-induced mitochondrial morphological changes such as swelling, irregular cristae, and smaller size and number, as observed by transmission electron microscope. In addition, 1,25(OH)2D treatment increases mtDNA contents as well as gene expression involved in mitochondrial biogenesis such as PGC1α, NRF1, and Tfam. Significant increments in mRNA levels related to antioxidant enzymes such as Nrf2, HMOX1, and TXNRD1, myogenic differentiation markers including myoglobin, muscle creatine kinase (MCK), and MHCІ and ІІ, and vitamin D metabolism such as CYP24, CYP27, and vitamin D receptor (VDR) were found in 1,25(OH)2D-treated myotubes. Moreover, upon t-BHP-induced oxidative stress, significant incremental changes in nicotinamide adenine dinucleotide (NAD) levels, activities of AMP-activated protein kinase (AMPK)/sirtulin 1 (SIRT1), and SIRT1 expression were noted in 1,25(OH)2D-treated C2C12 muscle cells. Taken together, these results suggest the observed potent inhibitory effect of 1,25(OH)2D on muscle oxidative stress and mitochondrial dynamics might be at least involved in the activation of AMPK and SIRT1 activation in muscle cells.
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Affiliation(s)
- Eugene Chang
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03760, Korea.
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13
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Abstract
OBJECTIVE To determine the effects and mechanism of carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM-1, CC1)-mediated regulation of the Coxsackie and Adenovirus Receptor (CAR) after Coxsackievirus B3 (CVB3) infection. METHODS A mouse CC1 overexpression recombinant virus was constructed, followed by insertion of a pLVX-CEACAM 1-zsgreen-puro (rLV-CEACAM 1) plasmid into the recombinant retrovirus. Cardiac myocytes were assigned into different groups according to various treatments. The apoptosis rate and cell activity in each group were observed. Further, CAR expression and SYK, IL-1β, and p-SYK levels were measured. RESULTS The recombinant retrovirus titer was measured as 1.5 × 10 TUs/ml. The apoptosis rate of cardiac myocytes in the CC1 overexpression plus CVB3 group was significantly elevated, and the relative expression of the CAR gene was the highest in the CC1 overexpression plus CVB3 group. TNF-α and IL-1β levels increased due to CC1 overexpression and further increased after CVB3 infection. CAR protein expression also changed along with the levels of CC1, SYK, and TNF-α after infection. CONCLUSION CC1 may promote CAR expression after CVB3 infection and regulate CAR protein expression by activating the CC1-SYK-TNF-α signaling axis during the infection process.
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Affiliation(s)
- Zaiyong Zhang
- Department of Cardiology, Panyu Central Hospital
- Cardiovascular Institute of Panyu District
- School of Life Sciences, South China Normal University
| | - Cheng Long
- School of Life Sciences, South China Normal University
| | - Xinzhong Li
- Department of Cardiology, Nanfang Hospital, Southern Medical University
| | - Qiang Xie
- Department of Cardiology, Panyu Central Hospital
- Cardiovascular Institute of Panyu District
| | - Mingcai Song
- Department of Cardiology, Panyu Central Hospital
- Cardiovascular Institute of Panyu District
| | - Yulan Zhang
- Department of Ultrasound, Guangdong Women and Children Hospital, Guangzhou, China
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Sahli Costabal F, Choy JS, Sack KL, Guccione JM, Kassab GS, Kuhl E. Multiscale characterization of heart failure. Acta Biomater 2019; 86:66-76. [PMID: 30630123 DOI: 10.1016/j.actbio.2018.12.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 09/18/2018] [Revised: 12/28/2018] [Accepted: 12/31/2018] [Indexed: 12/27/2022]
Abstract
Dilated cardiomyopathy is a progressive irreversible disease associated with contractile dysfunction and heart failure. During dilated cardiomyopathy, elevated diastolic wall strains trigger mechanotransduction pathways that initiate the addition of sarcomeres in series and an overall increase in myocyte length. At the whole organ level, this results in a chronic dilation of the ventricles, an increase in end diastolic and end systolic volumes, and a decrease in ejection fraction. However, how exactly changes in sarcomere number translate into changes in myocyte morphology, and how these cellular changes translate into ventricular dilation remains incompletely understood. Here we combined a chronic animal study, continuum growth modeling, and machine learning to quantify correlations between sarcomere dynamics, myocyte morphology, and ventricular dilation. In an eight-week long volume overload study of six pigs, we found that the average sarcomere number increased by +3.8%/week, from 47 to 62, resulting in a myocyte lengthening of +3.3%/week, from 85 to 108 μm, while the sarcomere length and myocyte width remained unchanged. At the same time, the average end diastolic volume increased by +6.0%/week. Using continuum growth modeling and Bayesian inference, we correlated alterations on the subcellular, cellular, and organ scales and found that the serial sarcomere number explained 88% of myocyte lengthening, which, in turn, explained 54% of cardiac dilation. Our results demonstrate that sarcomere number and myocyte length are closely correlated and constitute the major determinants of dilated heart failure. We anticipate our study to be a starting point for more sophisticated multiscale models of heart failure. Our study suggests that altering sarcomere turnover-and with it myocyte morphology and ventricular dimensions-could be a potential therapeutic target to attenuate or reverse the progression of heart failure. STATEMENT OF SIGNIFICANCE: Heart failure is a significant global health problem that affects more than 25 million people worldwide and increases in prevalence as the population ages. Heart failure has been studied excessively at various scales; yet, there is no compelling concept to connect knowledge from the subcellular, cellular, and organ level across the scales. Here we combined a chronic animal study, continuum growth modeling, and machine learning to quantify correlations between sarcomere dynamics, myocyte morphology, and ventricular dilation. We found that the serial sarcomere number explained 88% of myocyte lengthening, which, in turn, explained 54% of cardiac dilation. Our results show that sarcomere number and myocyte length are closely correlated and constitute the major determinants of dilated heart failure. This suggests that altering the sarcomere turnover-and with it myocyte morphology and ventricular dimensions-could be a potential therapeutic target to attenuate or reverse heart failure.
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Affiliation(s)
- F Sahli Costabal
- Departments of Mechanical Engineering & Bioengineering, Stanford University, CA, USA
| | - J S Choy
- California Medical Innovations Institute, Inc., San Diego, CA, USA
| | - K L Sack
- Department of Human Biology, University of Cape Town, Cape Town, South Africa
| | - J M Guccione
- Department of Surgery, University of California at San Francisco, San Francisco, CA, USA
| | - G S Kassab
- California Medical Innovations Institute, Inc., San Diego, CA, USA
| | - E Kuhl
- Departments of Mechanical Engineering & Bioengineering, Stanford University, CA, USA.
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Ionescu A, Gradus T, Altman T, Maimon R, Saraf Avraham N, Geva M, Hayden M, Perlson E. Targeting the Sigma-1 Receptor via Pridopidine Ameliorates Central Features of ALS Pathology in a SOD1 G93A Model. Cell Death Dis 2019; 10:210. [PMID: 30824685 PMCID: PMC6397200 DOI: 10.1038/s41419-019-1451-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 11/16/2018] [Accepted: 02/12/2019] [Indexed: 12/29/2022]
Abstract
Amyotrophic Lateral Sclerosis (ALS) is a fatal neurodegenerative disease affecting both the upper and lower motor neurons (MNs), with no effective treatment currently available. Early pathological events in ALS include perturbations in axonal transport (AT), formation of toxic protein aggregates and Neuromuscular Junction (NMJ) disruption, which all lead to axonal degeneration and motor neuron death. Pridopidine is a small molecule that has been clinically developed for Huntington disease. Here we tested the efficacy of pridopidine for ALS using in vitro and in vivo models. Pridopidine beneficially modulates AT deficits and diminishes NMJ disruption, as well as motor neuron death in SOD1G93A MNs and in neuromuscular co-cultures. Furthermore, we demonstrate that pridopidine activates the ERK pathway and mediates its beneficial effects through the sigma-1 receptor (S1R). Strikingly, in vivo evaluation of pridopidine in SOD1G93A mice reveals a profound reduction in mutant SOD1 aggregation in the spinal cord, and attenuation of NMJ disruption, as well as subsequent muscle wasting. Taken together, we demonstrate for the first time that pridopidine improves several cellular and histological hallmark pathologies of ALS through the S1R.
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Affiliation(s)
- Ariel Ionescu
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Tal Gradus
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Topaz Altman
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Roy Maimon
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Noi Saraf Avraham
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Michal Geva
- Teva Pharmaceuticals Ltd, Petah Tikva, Israel
- Prilenia Therapeutics, Herzliya, Israel
| | - Michael Hayden
- Teva Pharmaceuticals Ltd, Petah Tikva, Israel
- Prilenia Therapeutics, Herzliya, Israel
| | - Eran Perlson
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel.
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel.
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16
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Sasaki-Honda M, Jonouchi T, Arai M, Hotta A, Mitsuhashi S, Nishino I, Matsuda R, Sakurai H. A patient-derived iPSC model revealed oxidative stress increases facioscapulohumeral muscular dystrophy-causative DUX4. Hum Mol Genet 2018; 27:4024-4035. [PMID: 30107443 PMCID: PMC6240734 DOI: 10.1093/hmg/ddy293] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 06/18/2018] [Accepted: 08/07/2018] [Indexed: 12/21/2022] Open
Abstract
Double homeobox 4 (DUX4), the causative gene of facioscapulohumeral muscular dystrophy (FSHD), is ectopically expressed in the skeletal muscle cells of FSHD patients because of chromatin relaxation at 4q35. The diminished heterochromatic state at 4q35 is caused by either large genome contractions [FSHD type 1 (FSHD1)] or mutations in genes encoding chromatin regulators, such as SMCHD1 [FSHD type 2 (FSHD2)]. However, the mechanism by which DUX4 expression is regulated remains largely unknown. Here, using a myocyte model developed from patient-derived induced pluripotent stem cells, we determined that DUX4 expression was increased by oxidative stress (OS), a common environmental stress in skeletal muscle, in both FSHD1 and FSHD2 myocytes. We generated FSHD2-derived isogenic control clones with SMCHD1 mutation corrected by clustered regularly interspaced short palindromic repeats (CRISPR)/ CRISPR associated 9 (Cas9) and homologous recombination and found in the myocytes obtained from these clones that DUX4 basal expression and the OS-induced upregulation were markedly suppressed due to an increase in the heterochromatic state at 4q35. We further found that DNA damage response (DDR) was involved in OS-induced DUX4 increase and identified ataxia-telangiectasia mutated, a DDR regulator, as a mediator of this effect. Our results suggest that the relaxed chromatin state in FSHD muscle cells permits aberrant access of OS-induced DDR signaling, thus increasing DUX4 expression. These results suggest OS could represent an environmental risk factor that promotes FSHD progression.
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Affiliation(s)
- Mitsuru Sasaki-Honda
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, Japan
| | - Tatsuya Jonouchi
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
| | - Meni Arai
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
- Agricultural and Environmental Engineering, Faculty of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, Japan
| | - Akitsu Hotta
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
| | - Satomi Mitsuhashi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Ryoichi Matsuda
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, Japan
- Department of Life Sciences, Graduate School of Arts and Sciences, the University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, Japan
| | - Hidetoshi Sakurai
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
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17
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Zhang W, Wang Y, Wan J, Zhang P, Pei F. COX6B1 relieves hypoxia/reoxygenation injury of neonatal rat cardiomyocytes by regulating mitochondrial function. Biotechnol Lett 2018; 41:59-68. [PMID: 30311029 PMCID: PMC6313357 DOI: 10.1007/s10529-018-2614-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 10/04/2018] [Indexed: 12/31/2022]
Abstract
Objective Mitochondrial dysfunction plays a pivotal role in various pathophysiological processes of heart. Cytochrome oxidase subunit 6B1 (COX6B1) is a subunit of cytochrome oxidase. Methods Cardiomyocytes were isolated from neonatal SD rats (within 24 h of birth) by repeating digestion of collagenase and trypsin. COX6B1 over-expression and hypoxia/reoxygenation was conducted on neonatal rat cardiomyocytes. Cell viability, apoptosis rates, mitochondria membrane potential and mitochondrial permeabilization transition pores (mPTPs) were then determined respectively by Cell performing Counting Kit-8 (CCK-8), Annexin-V/PI assay, JC-1 assay, mPTP assay. The expression of cyto C and apoptosis-related factors were detected by RT-Qpcr and Western blot. Results Hypoxia/reoxygenation increased apoptosis and mPTP levels, and decreased mitochondria membrane potential in I/R and I/R + EV groups. COX6B1 over-expression increased mitochondria cyto C, pro-caspase-3, pro-caspase-9 and bcl-2, while it decreased cytosol cyto C, cleaved-caspase-3, cleaved-caspase-9 and bax compared to I/R + EV group. Conclusion COX6B1 protected cardiomyocytes from hypoxia/reoxygenation injury by reducing ROS production and cell apoptosis, during which reduction of the release of cytochrome C from mitochondria to cytosol was involved. Our study demonstrated that COX6B1 may be an candidate target gene in preventing hypoxia/reoxygenation injury of cardiomyocytes.
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Affiliation(s)
- Wei Zhang
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, No.157 West 5 Road, Xi'an, 710004, Shaanxi Province, China
| | - Yu Wang
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, No.157 West 5 Road, Xi'an, 710004, Shaanxi Province, China
| | - Junzhe Wan
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, No.157 West 5 Road, Xi'an, 710004, Shaanxi Province, China
| | - Pengbo Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, No.157 West 5 Road, Xi'an, 710004, Shaanxi Province, China
| | - Fei Pei
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, No.157 West 5 Road, Xi'an, 710004, Shaanxi Province, China.
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18
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Carnagarin R, Elahy M, Dharmarajan AM, Dass CR. Insulin antagonises pigment epithelium-derived factor (PEDF)-induced modulation of lineage commitment of myocytes and heterotrophic ossification. Mol Cell Endocrinol 2018; 472:159-166. [PMID: 29258756 DOI: 10.1016/j.mce.2017.12.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 11/07/2017] [Accepted: 12/15/2017] [Indexed: 12/13/2022]
Abstract
Extensive bone defects arising as a result of trauma, infection and tumour resection and other bone pathologies necessitates the identification of effective strategies in the form of tissue engineering, gene therapy and osteoinductive agents to enhance the bone repair process. PEDF is a multifunctional glycoprotein which plays an important role in regulating osteoblastic differentiation and bone formation. PEDF treatment of mice and human skeletal myocytes at physiological concentration inhibited myogenic differentiation and activated Erk1/2 MAPK- dependent osteogenic transdifferentiation of myocytes. In mice, insulin, a promoter of bone regeneration, attenuated PEDF-induced expression of osteogenic markers such as osteocalcin, alkaline phosphatase and mineralisation for bone formation in the muscle and surrounding adipose tissue. These results provide new insights into the molecular aspects of the antagonising effect of insulin on PEDF-dependent modulation of the differentiation commitment of musculoskeletal environment into osteogenesis, and suggest that PEDF may be developed as an effective clinical therapy for bone regeneration as its heterotopic ossification can be controlled via co-administration of insulin.
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Affiliation(s)
- Revathy Carnagarin
- Curtin Health Innovation Research Institute, Bentley, 6102, Australia; School of Pharmacy, Curtin University, Bentley, 6102, Australia; School of Biomedical Sciences, Curtin University, Bentley, 6102, Australia; Stem Cell and Cancer Biology Laboratory, School of Biomedical Sciences, Curtin University, Bentley, 6102, Australia
| | - Mina Elahy
- Curtin Health Innovation Research Institute, Bentley, 6102, Australia; School of Biomedical Sciences, Curtin University, Bentley, 6102, Australia
| | - Arun M Dharmarajan
- Curtin Health Innovation Research Institute, Bentley, 6102, Australia; Stem Cell and Cancer Biology Laboratory, School of Biomedical Sciences, Curtin University, Bentley, 6102, Australia
| | - Crispin R Dass
- Curtin Health Innovation Research Institute, Bentley, 6102, Australia; School of Pharmacy, Curtin University, Bentley, 6102, Australia.
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Rubio-Solsona E, Martí S, Vílchez JJ, Palau F, Hoenicka J. ANKK1 is found in myogenic precursors and muscle fibers subtypes with glycolytic metabolism. PLoS One 2018; 13:e0197254. [PMID: 29758057 PMCID: PMC5951577 DOI: 10.1371/journal.pone.0197254] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 04/30/2018] [Indexed: 11/24/2022] Open
Abstract
Ankyrin repeat and kinase domain containing 1 (ANKK1) gene has been widely related to neuropsychiatry disorders. The localization of ANKK1 in neural progenitors and its correlation with the cell cycle has suggested its participation in development. However, ANKK1 functions still need to be identified. Here, we have further characterized the ANKK1 localization in vivo and in vitro, by using immunolabeling, quantitative real-time PCR and Western blot in the myogenic lineage. Histologic investigations in mice and humans revealed that ANKK1 is expressed in precursors of embryonic and adult muscles. In mice embryos, ANKK1 was found in migrating myotubes where it shows a polarized cytoplasmic distribution, while proliferative myoblasts and satellite cells show different isoforms in their nuclei and cytoplasm. In vitro studies of ANKK1 protein isoforms along the myogenic progression showed the decline of nuclear ANKK1-kinase until its total exclusion in myotubes. In adult mice, ANKK1 was expressed exclusively in the Fast-Twitch muscles fibers subtype. The induction of glycolytic metabolism in C2C12 cells with high glucose concentration or treatment with berberine caused a significant increase in the ANKK1 mRNA. Similarly, C2C12 cells under hypoxic conditions caused the increase of nuclear ANKK1. These results altogether show a relationship between ANKK1 gene regulation and the metabolism of muscles during development and in adulthood. Finally, we found ANKK1 expression in regenerative fibers of muscles from dystrophic patients. Future studies in ANKK1 biology and the pathological response of muscles will reveal whether this protein is a novel muscle disease biomarker.
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Affiliation(s)
- Estrella Rubio-Solsona
- CIBERER Biobank, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
- Centro de Investigación Príncipe Felipe, Valencia, Spain
| | - Salvador Martí
- CIBERER Biobank, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
| | - Juan J. Vílchez
- CIBERER Biobank, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
- Department of Neurology, Hospital Universitari i Politècnic La Fe, Valencia, Spain
- Neuromuscular Research Unit, Instituto de Investigación Sanitaria la Fe (IIS La Fe), Valencia, Spain
- Department of Medicine, University of Valencia School of Medicine, Valencia, Spain
| | - Francesc Palau
- CIBERER Biobank, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
- Centro de Investigación Príncipe Felipe, Valencia, Spain
- Department of Genetic and Molecular Medicine, Hospital Sant Joan de Déu, Barcelona, Spain
- Laboratory of Neurogenetics and Molecular Medicine, Institut de Recerca Sant Joan de Déu, Barcelona, Spain
- Division of Pediatrics, University of Barcelona School of Medicine, Barcelona, Spain
| | - Janet Hoenicka
- Centro de Investigación Príncipe Felipe, Valencia, Spain
- Laboratory of Neurogenetics and Molecular Medicine, Institut de Recerca Sant Joan de Déu, Barcelona, Spain
- CIBER de Salud Mental (CIBERSAM), Madrid, Spain
- * E-mail:
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20
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Teot LA, Schneider M, Thorner AR, Tian J, Chi YY, Ducar M, Lin L, Wlodarski M, Grier HE, Fletcher CDM, van Hummelen P, Skapek SX, Hawkins DS, Wagers AJ, Rodriguez-Galindo C, Hettmer S. Clinical and mutational spectrum of highly differentiated, paired box 3:forkhead box protein o1 fusion-negative rhabdomyosarcoma: A report from the Children's Oncology Group. Cancer 2018; 124:1973-1981. [PMID: 29461635 DOI: 10.1002/cncr.31286] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 11/01/2017] [Revised: 12/19/2017] [Accepted: 01/03/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND Pediatric paired box 3:forkhead box protein O1 fusion-negative (PF-) rhabdomyosarcoma (RMS) represents a diverse spectrum of tumors with marked differences in histology, myogenic differentiation, and clinical behavior. METHODS This study sought to evaluate the clinical and mutational spectrum of 24 pediatric PF- human RMS tumors with high levels of myogenic differentiation. Tumors were sequenced with OncoPanel v.2, a panel consisting of the coding regions of 504 genes previously linked to human cancer. RESULTS Most of the tumors (19 of 24) arose at head/neck or genitourinary sites, and the overall survival rate was 100% with a median follow-up time of 4.6 years (range, 1.4-8.6 years). RAS pathway gene mutations were the most common mutations in PF-, highly differentiated RMS tumors. In addition, Hedgehog (Hh) and mechanistic target of rapamycin (mTOR) gene mutations with evidence for functional relevance (high-impact) were identified in subsets of tumors. The presence of Hh and mTOR pathway gene mutations was mutually exclusive and was associated with high-impact RAS pathway gene mutations in 3 of 4 Hh-mutated tumors and in 1 of 6 mTOR-mutated tumors. CONCLUSIONS Interestingly, Hh and mTOR gene mutations were previously associated with rhabdomyomas, which are also known to preferentially arise at head/neck and genitourinary sites. Findings from this study further support the idea that PF-, highly differentiated RMS tumors and rhabdomyomas may represent a continuous spectrum of tumors. Cancer 2018;124:1973-81. © 2018 American Cancer Society.
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Affiliation(s)
- Lisa A Teot
- Department of Pathology, Boston Children's Hospital, Boston, Massachusetts
| | - Michaela Schneider
- Division of Pediatric Hematology and Oncology, Department of Pediatric and Adolescent Medicine, Faculty of Medicine, University of Freiburg, Germany
| | - Aaron R Thorner
- Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Jing Tian
- Department of Biostatistics, University of Florida, Gainesville, Florida
| | - Yueh-Yun Chi
- Department of Biostatistics, University of Florida, Gainesville, Florida
| | - Matthew Ducar
- Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Ling Lin
- Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Marcin Wlodarski
- Division of Pediatric Hematology and Oncology, Department of Pediatric and Adolescent Medicine, Faculty of Medicine, University of Freiburg, Germany
| | - Holcombe E Grier
- Dana-Farber/Boston Children's Cancer and Blood Disorders Center, Boston, Massachusetts
| | | | - Paul van Hummelen
- Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Stephen X Skapek
- Division of Hematology/Oncology, Children's Medical Center, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Douglas S Hawkins
- Division of Hematology/Oncology, Seattle Children's Hospital, University of Washington, Seattle, Washington
- Fred Hutchinson Cancer Center, Seattle, Washington
| | - Amy J Wagers
- Harvard Stem Cell Institute, Cambridge, Massachusetts
- Department of Stem Cell and Regenerative Biology, Joslin Diabetes Center, Boston, Massachusetts
- Paul F. Glenn Center for the Biology of Aging at Harvard Medical School, Boston, Massachusetts
| | - Carlos Rodriguez-Galindo
- Department of Global Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Simone Hettmer
- Division of Pediatric Hematology and Oncology, Department of Pediatric and Adolescent Medicine, Faculty of Medicine, University of Freiburg, Germany
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21
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Bosnakovski D, Toso EA, Hartweck LM, Magli A, Lee HA, Thompson ER, Dandapat A, Perlingeiro RCR, Kyba M. The DUX4 homeodomains mediate inhibition of myogenesis and are functionally exchangeable with the Pax7 homeodomain. J Cell Sci 2017; 130:3685-3697. [PMID: 28935672 PMCID: PMC5702055 DOI: 10.1242/jcs.205427] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [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: 04/24/2017] [Accepted: 09/11/2017] [Indexed: 01/15/2023] Open
Abstract
Facioscapulohumeral muscular dystrophy (FSHD) is caused by inappropriate expression of the double homeodomain protein DUX4. DUX4 has bimodal effects, inhibiting myogenic differentiation and blocking MyoD at low levels of expression, and killing myoblasts at high levels. Pax3 and Pax7, which contain related homeodomains, antagonize the cell death phenotype of DUX4 in C2C12 cells, suggesting some type of competitive interaction. Here, we show that the effects of DUX4 on differentiation and MyoD expression require the homeodomains but do not require the C-terminal activation domain of DUX4. We tested the set of equally related homeodomain proteins (Pax6, Pitx2c, OTX1, Rax, Hesx1, MIXL1 and Tbx1) and found that only Pax3 and Pax7 display phenotypic competition. Domain analysis on Pax3 revealed that the Pax3 homeodomain is necessary for phenotypic competition, but is not sufficient, as competition also requires the paired and transcriptional activation domains of Pax3. Remarkably, substitution mutants in which DUX4 homeodomains are replaced by Pax7 homeodomains retain the ability to inhibit differentiation and to induce cytotoxicity.
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Affiliation(s)
- Darko Bosnakovski
- Faculty of Medical Sciences, University Goce Delcev-Stip, 2000 Stip, R. Macedonia
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
| | - Erik A Toso
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
| | - Lynn M Hartweck
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
| | - Alessandro Magli
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, Minneapolis, MN 55104, USA
| | - Heather A Lee
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
| | - Eliza R Thompson
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
| | - Abhijit Dandapat
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
| | - Rita C R Perlingeiro
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, Minneapolis, MN 55104, USA
| | - Michael Kyba
- Lillehei Heart Institute, Department of Pediatrics, University of Minnesota, Minneapolis, MN 55014, USA
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22
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Ariga M, Yoneyama Y, Fukushima T, Ishiuchi Y, Ishii T, Sato H, Hakuno F, Nedachi T, Takahashi SI. Glucose deprivation attenuates sortilin levels in skeletal muscle cells. Endocr J 2017; 64:255-268. [PMID: 27980238 DOI: 10.1507/endocrj.ej16-0319] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In skeletal muscle, sortilin plays a predominant role in the sorting of glucose transporter 4 (Glut4), thereby controlling glucose uptake. Moreover, our previous study suggested that the sortilin expression levels are also implicated in myogenesis. Despite the importance of sortilin in skeletal muscle, however, the regulation of sortilin expression has not been completely understood. In the present study, we analyzed if the sortilin expression is regulated by glucose in C2C12 myocytes and rat skeletal muscles in vivo. Sortilin protein expression was elevated upon C2C12 cell differentiation and was further enhanced in the presence of a high concentration of glucose. The gene expression and protein degradation of sortilin were not affected by glucose. On the other hand, rapamycin partially reduced sortilin induction by a high concentration of glucose, which suggested that sortilin translation could be regulated by glucose, at least in part. We also examined if the sortilin regulation by glucose was also observed in skeletal muscles that were obtained from fed or fasted rats. Sortilin expression in both gastrocnemius and extensor digitorum longus (EDL) muscle was significantly decreased by 17-18h of starvation. On the other hand, pathological levels of high blood glucose did not alter the sortilin expression in rat skeletal muscle. Overall, the present study suggests that sortilin protein levels are reduced under hypoglycemic conditions by post-transcriptional control in skeletal muscles.
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MESH Headings
- Adaptor Proteins, Vesicular Transport/agonists
- Adaptor Proteins, Vesicular Transport/genetics
- Adaptor Proteins, Vesicular Transport/metabolism
- Animals
- Blood Glucose/analysis
- Cell Differentiation
- Cell Line
- Diabetes Mellitus, Experimental/blood
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/pathology
- Down-Regulation/drug effects
- Fasting/metabolism
- Food Deprivation
- Glucose/metabolism
- Hindlimb
- Male
- Mechanistic Target of Rapamycin Complex 1
- Multiprotein Complexes/antagonists & inhibitors
- Multiprotein Complexes/metabolism
- Muscle Cells/cytology
- Muscle Cells/drug effects
- Muscle Cells/metabolism
- Muscle Cells/pathology
- Muscle, Skeletal/cytology
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Protein Kinase Inhibitors/pharmacology
- RNA, Messenger/metabolism
- Rats, Wistar
- Sirolimus/pharmacology
- TOR Serine-Threonine Kinases/antagonists & inhibitors
- TOR Serine-Threonine Kinases/metabolism
- Up-Regulation/drug effects
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Affiliation(s)
- Miyako Ariga
- Department of Animal Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
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23
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Gois PHF, Canale D, Volpini RA, Ferreira D, Veras MM, Andrade-Oliveira V, Câmara NOS, Shimizu MHM, Seguro AC. Allopurinol attenuates rhabdomyolysis-associated acute kidney injury: Renal and muscular protection. Free Radic Biol Med 2016; 101:176-189. [PMID: 27769920 DOI: 10.1016/j.freeradbiomed.2016.10.012] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 09/16/2016] [Accepted: 10/16/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND Acute kidney injury (AKI) is the most severe complication of rhabdomyolysis. Allopurinol (Allo), a xanthine oxidase inhibitor, has been in the spotlight in the last decade due to new therapeutic applications related to its potent antioxidant effect. The aim of this study was to evaluate the efficacy of Allo in the prevention and treatment of rhabdomyolysis-associated AKI. METHODS Male Wistar rats were divided into five groups: saline control group; prophylactic Allo (300mg/L of drinking water, 7 days); glycerol (50%, 5ml/kg, IM); prophylactic Allo + glycerol; and therapeutic Allo (50mg/Kg, IV, 30min after glycerol injection) + glycerol. RESULTS Glycerol-injected rats showed markedly reduced glomerular filtration rate associated with renal vasoconstriction, renal tubular damage, increased oxidative stress, apoptosis and inflammation. Allo ameliorated all these alterations. We found 8-isoprostane-PGF2a (F2-IsoP) as a main factor involved in the oxidative stress-mediated renal vasoconstriction following rhabdomyolysis. Allo reduced F2-IsoP renal expression and restored renal blood flow. Allo also reduced oxidative stress in the damaged muscle, attenuated muscle lesion/inflammation and accelerated muscular recovery. Moreover, we showed new insights into the pathogenesis of rhabdomyolysis-associated AKI, whereas Allo treatment reduced renal inflammation by decreasing renal tissue uric acid levels and consequently inhibiting the inflammasome cascade. CONCLUSIONS Allo treatment attenuates renal dysfunction in a model of rhabdomyolysis-associated AKI by reducing oxidative stress (systemic, renal and muscular), apoptosis and inflammation. This may represent a new therapeutic approach for rhabdomyolysis-associated AKI - a new use for an old and widely available medication.
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Affiliation(s)
- Pedro H F Gois
- Laboratory of Medical Research - LIM12, Nephrology Department, University of São Paulo School of Medicine, São Paulo, Brazil.
| | - Daniele Canale
- Laboratory of Medical Research - LIM12, Nephrology Department, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Rildo A Volpini
- Laboratory of Medical Research - LIM12, Nephrology Department, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Daniela Ferreira
- Laboratory of Medical Research - LIM12, Nephrology Department, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Mariana M Veras
- Laboratory of Medical Research - LIM05, Department of Pathology, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Vinicius Andrade-Oliveira
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences IV, University of São Paulo, São Paulo, Brazil
| | - Niels O S Câmara
- Laboratory of Transplantation Immunobiology, Department of Immunology, Institute of Biomedical Sciences IV, University of São Paulo, São Paulo, Brazil
| | - Maria H M Shimizu
- Laboratory of Medical Research - LIM12, Nephrology Department, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Antonio C Seguro
- Laboratory of Medical Research - LIM12, Nephrology Department, University of São Paulo School of Medicine, São Paulo, Brazil
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24
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Moore JC, Tang Q, Yordán NT, Moore FE, Garcia EG, Lobbardi R, Ramakrishnan A, Marvin DL, Anselmo A, Sadreyev RI, Langenau DM. Single-cell imaging of normal and malignant cell engraftment into optically clear prkdc-null SCID zebrafish. J Exp Med 2016; 213:2575-2589. [PMID: 27810924 PMCID: PMC5110017 DOI: 10.1084/jem.20160378] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 09/16/2016] [Indexed: 12/03/2022] Open
Abstract
Cell transplantation into immunodeficient mice has revolutionized our understanding of regeneration, stem cell self-renewal, and cancer; yet models for direct imaging of engrafted cells has been limited. Here, we characterize zebrafish with mutations in recombination activating gene 2 (rag2), DNA-dependent protein kinase (prkdc), and janus kinase 3 (jak3). Histology, RNA sequencing, and single-cell transcriptional profiling of blood showed that rag2 hypomorphic mutant zebrafish lack T cells, whereas prkdc deficiency results in loss of mature T and B cells and jak3 in T and putative Natural Killer cells. Although all mutant lines engraft fluorescently labeled normal and malignant cells, only the prkdc mutant fish reproduced as homozygotes and also survived injury after cell transplantation. Engraftment into optically clear casper, prkdc-mutant zebrafish facilitated dynamic live cell imaging of muscle regeneration, repopulation of muscle stem cells within their endogenous niche, and muscle fiber fusion at single-cell resolution. Serial imaging approaches also uncovered stochasticity in fluorescently labeled leukemia regrowth after competitive cell transplantation into prkdc mutant fish, providing refined models to assess clonal dominance and progression in the zebrafish. Our experiments provide an optimized and facile transplantation model, the casper, prkdc mutant zebrafish, for efficient engraftment and direct visualization of fluorescently labeled normal and malignant cells at single-cell resolution.
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Affiliation(s)
- John C Moore
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
| | - Qin Tang
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
| | - Nora Torres Yordán
- Harvard Stem Cell Institute, Cambridge, MA 02139
- Harvard University, Cambridge, MA 02138
| | - Finola E Moore
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
| | - Elaine G Garcia
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
| | - Riadh Lobbardi
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
| | - Ashwin Ramakrishnan
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
| | - Dieuwke L Marvin
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
| | - Anthony Anselmo
- Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114
- Department of Genetics, Harvard Medical School, Boston, MA 02115
| | - Ruslan I Sadreyev
- Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114
- Department of Genetics, Harvard Medical School, Boston, MA 02115
| | - David M Langenau
- Molecular Pathology, Massachusetts General Hospital, Charlestown, MA 02129
- Cancer Center, Massachusetts General Hospital, Charlestown, MA 02129
- Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114
- Harvard Stem Cell Institute, Cambridge, MA 02139
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25
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Yao Y, Da Ong LX, Li X, Wan K, Mak AFT. Effects of Biowastes Released by Mechanically Damaged Muscle Cells on the Propagation of Deep Tissue Injury: A Multiphysics Study. Ann Biomed Eng 2016; 45:761-774. [PMID: 27624658 DOI: 10.1007/s10439-016-1731-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 09/07/2016] [Indexed: 12/24/2022]
Abstract
Deep tissue injuries occur in muscle tissues around bony prominences under mechanical loading leading to severe pressure ulcers. Tissue compression can potentially compromise lymphatic transport and cause accumulation of metabolic biowastes, which may cause further cell damage under continuous mechanical loading. In this study, we hypothesized that biowastes released by mechanically damaged muscle cells could be toxic to the surrounding muscle cells and could compromise the capability of the surrounding muscle cells to withstand further mechanical loadings. In vitro, we applied prolonged low compressive stress (PLCS) and short-term high compressive stress to myoblasts to cause cell damage and collected the biowastes released by the damaged cells under the respective loading scenarios. In silico, we used COMSOL to simulate the compressive stress distribution and the diffusion of biowastes in a semi-3D buttock finite element model. In vitro results showed that biowastes collected from cells damaged under PLCS were more toxic and could compromise the capability of normal myoblasts to resist compressive damage. In silico results showed that higher biowastes diffusion coefficient, higher biowastes release rate, lower biowastes tolerance threshold and earlier timeline of releasing biowastes would cause faster propagation of tissue damage. This study highlighted the importance of biowastes in the development of deep tissue injury to clinical pressure ulcers under prolonged skeletal compression.
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Affiliation(s)
- Yifei Yao
- Division of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Lucas Xian Da Ong
- Division of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
- Department of Biomedical Engineering, National University of Singapore, Singapore, Singapore
| | - Xiaotong Li
- Division of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Kinlun Wan
- Division of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Arthur F T Mak
- Division of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China.
- Division of Biomedical Engineering, The Chinese University of Hong Kong, Rm. 429, Ho Sin Hang Engineering Building, Shatin, N.T., Hong Kong SAR, China.
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26
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Muskiewicz KR, Frank NY, Flint AF, Gussoni E. Myogenic Potential of Muscle Side and Main Population Cells after Intravenous Injection into Sub-lethally IrradiatedmdxMice. J Histochem Cytochem 2016; 53:861-73. [PMID: 15995145 DOI: 10.1369/jhc.4a6573.2005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Muscle side population (SP) cells have demonstrated hematopoietic and myogenic activities in vivo upon intravenous (IV) injection into lethally irradiated mdx mice. In contrast, muscle main population (MP) cells were unable to rescue the bone marrow of lethally irradiated mice and, consequently, their in vivo myogenic potential could not be assessed using this method. In the current study, muscle SP or MP cells derived from syngeneic wild-type male mice were delivered to sub-lethally irradiated mdx female mice by single or serial IV injections. Recipient mice were euthanized 12 weeks after transplantation at which time the quadriceps and diaphragm muscles were analyzed for the presence of donor-derived cells. Mice injected with 104muscle SP cells or with 106MP cells appeared to have similar numbers of dystrophin-positive myofibers containing fused donor nuclei. Analysis of the remaining tissue via real-time quantitative PCR indicated that mice injected with muscle SP cells had a higher percentage of donor-derived Y-DNA in the quadriceps than mice injected with MP cells, suggesting that muscle SP cells may be enriched for progenitors able to engraft dystrophic skeletal muscles from the circulation. Although the overall engraftment did not reach therapeutically significant levels, these results indicate that further optimization of cell delivery techniques may lead to improved efficacy of cell-mediated therapy using muscle SP cells.
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Affiliation(s)
- Kristina R Muskiewicz
- Division of Genetics, Program in Genomics, Children's Hospital Boston, 320 Longwood Avenue, Boston, MA 02115, USA
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27
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Kabir AU, Samad MB, Ahmed A, Jahan MR, Akhter F, Tasnim J, Hasan SMN, Sayfe SS, Hannan JMA. Aqueous fraction of Beta vulgaris ameliorates hyperglycemia in diabetic mice due to enhanced glucose stimulated insulin secretion, mediated by acetylcholine and GLP-1, and elevated glucose uptake via increased membrane bound GLUT4 transporters. PLoS One 2015; 10:e0116546. [PMID: 25647228 PMCID: PMC4315578 DOI: 10.1371/journal.pone.0116546] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Accepted: 12/09/2014] [Indexed: 12/25/2022] Open
Abstract
Background The study was designed to investigate the probable mechanisms of anti-hyperglycemic activity of B. Vulgaris. Methodology/Principal Findings Aqueous fraction of B. Vulgaris extract was the only active fraction (50mg/kg). Plasma insulin level was found to be the highest at 30 mins after B. Vulgaris administration at a dose of 200mg/kg. B. Vulgaris treated mice were also assayed for plasma Acetylcholine, Glucagon Like Peptide-1 (GLP-1), Gastric Inhibitory Peptide (GIP), Vasoactive Intestinal Peptide, Pituitary Adenylate Cyclase-Activating Peptide (PACAP), Insulin Like Growth Factor-1 (IGF-1), Pancreatic Polypeptides (PP), and Somatostatin, along with the corresponding insulin levels. Plasma Acetylcholine and GLP-1 significantly increased in B. Vulgaris treated animals and were further studied. Pharmacological enhancers, inhibitors, and antagonists of Acetylcholine and GLP-1 were also administered to the test animals, and corresponding insulin levels were measured. These studies confirmed the role of acetylcholine and GLP-1 in enhanced insulin secretion (p<0.05). Principal signaling molecules were quantified in isolated mice islets for the respective pathways to elucidate their activities. Elevated concentrations of Acetylcholine and GLP-1 in B. Vulgaris treated mice were found to be sufficient to activate the respective pathways for insulin secretion (p<0.05). The amount of membrane bound GLUT1 and GLUT4 transporters were quantified and the subsequent glucose uptake and glycogen synthesis were assayed. We showed that levels of membrane bound GLUT4 transporters, glucose-6-phosphate in skeletal myocytes, activity of glycogen synthase, and level of glycogen deposited in the skeletal muscles all increased (p<0.05). Conclusion Findings of the present study clearly prove the role of Acetylcholine and GLP-1 in the Insulin secreting activity of B. Vulgaris. Increased glucose uptake in the skeletal muscles and subsequent glycogen synthesis may also play a part in the anti-hyperglycemic activity of B. Vulgaris.
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Affiliation(s)
- Ashraf Ul Kabir
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
- * E-mail:
| | - Mehdi Bin Samad
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
| | - Arif Ahmed
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
| | - Mohammad Rajib Jahan
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
| | - Farjana Akhter
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
| | - Jinat Tasnim
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
| | - S. M. Nageeb Hasan
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
| | - Sania Sarker Sayfe
- Pharmacy Discipline, Life Science School, Khulna University, Khulna, Bangladesh
| | - J. M. A. Hannan
- Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh
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Sahoo AK, Thakur PC, Shankar KM, Mohan CV, Sharma SRK, Corsin F. Histopathological findings on innate responses of white spot disease positive Penaeus monodon (Fabricius) under semi-intensive culture. J Fish Dis 2015; 38:91-95. [PMID: 24423278 DOI: 10.1111/jfd.12209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Revised: 10/15/2013] [Accepted: 10/15/2013] [Indexed: 06/03/2023]
Affiliation(s)
- A K Sahoo
- Fish Pathology and Biotechnology Laboratory, Department of Aquaculture, College of Fisheries, Karnataka Veterinary, Animal and Fishery Science University, Mangalore, India; Central Inland Fisheries Research Institute, Barrackpore, Kolkata, West Bengal, India
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Pugh SD, MacDougall DA, Agarwal SR, Harvey RD, Porter KE, Calaghan S. Caveolin contributes to the modulation of basal and β-adrenoceptor stimulated function of the adult rat ventricular myocyte by simvastatin: a novel pleiotropic effect. PLoS One 2014; 9:e106905. [PMID: 25211146 PMCID: PMC4161364 DOI: 10.1371/journal.pone.0106905] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 08/10/2014] [Indexed: 12/22/2022] Open
Abstract
The number of people taking statins is increasing across the globe, highlighting the importance of fully understanding statins' effects on the cardiovascular system. The beneficial impact of statins extends well beyond regression of atherosclerosis to include direct effects on tissues of the cardiovascular system ('pleiotropic effects'). Pleiotropic effects on the cardiac myocyte are often overlooked. Here we consider the contribution of the caveolin protein, whose expression and cellular distribution is dependent on cholesterol, to statin effects on the cardiac myocyte. Caveolin is a structural and regulatory component of caveolae, and is a key regulator of cardiac contractile function and adrenergic responsiveness. We employed an experimental model in which inhibition of myocyte HMG CoA reductase could be studied in the absence of paracrine influences from non-myocyte cells. Adult rat ventricular myocytes were treated with 10 µM simvastatin for 2 days. Simvastatin treatment reduced myocyte cholesterol, caveolin 3 and caveolar density. Negative inotropic and positive lusitropic effects (with corresponding changes in [Ca2+]i) were seen in statin-treated cells. Simvastatin significantly potentiated the inotropic response to β2-, but not β1-, adrenoceptor stimulation. Under conditions of β2-adrenoceptor stimulation, phosphorylation of phospholamban at Ser16 and troponin I at Ser23/24 was enhanced with statin treatment. Simvastatin increased NO production without significant effects on eNOS expression or phosphorylation (Ser1177), consistent with the reduced expression of caveolin 3, its constitutive inhibitor. In conclusion, statin treatment can reduce caveolin 3 expression, with functional consequences consistent with the known role of caveolae in the cardiac cell. These data are likely to be of significance, particularly during the early phases of statin treatment, and in patients with heart failure who have altered β-adrenoceptor signalling. In addition, as caveolin is ubiquitously expressed and has myriad tissue-specific functions, the impact of statin-dependent changes in caveolin is likely to have many other functional sequelae.
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Affiliation(s)
- Sara D. Pugh
- School of Biomedical Sciences, University of Leeds, Leeds, West Yorkshire, United Kingdom
| | - David A. MacDougall
- School of Biomedical Sciences, University of Leeds, Leeds, West Yorkshire, United Kingdom
| | - Shailesh R. Agarwal
- Department of Pharmacology, University of Nevada Reno, Reno, Nevada, United States of America
| | - Robert D. Harvey
- Department of Pharmacology, University of Nevada Reno, Reno, Nevada, United States of America
| | - Karen E. Porter
- Division of Cardiovascular and Diabetes Research, University of Leeds, Leeds, West Yorkshire, United Kingdom
| | - Sarah Calaghan
- School of Biomedical Sciences, University of Leeds, Leeds, West Yorkshire, United Kingdom
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Abstract
OBJECTIVE To understand the mechanisms of postpartum uterine involution, we investigated the uterine myometrial changes during pregnancy and the postpartum period. MATERIALS AND METHODS Nine groups of uterine myometrial samples from mice (n = 4) were collected on gestational Day 0 (nonpregnant), Day 1, Day 2, Day 7, Day 14, and Day 21 and on postpartum Day 1, Day 2, and Day 7. Human samples of uterine myometrium on term (n = 1) and postpartum Day 1 (n = 2) were also collected. Ki-67 immunostaining was used to determine myometrial proliferation. For cell hypertrophy analysis, organelle proteins, β-actin, prohibin, calnexin, and golgin-97 were analyzed by Western blotting. Terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) and evaluation of activated caspase-3 expression by Western blot analysis assay were used to detect apoptosis. Autophagy was assayed via the evaluation of LC3 expression by Western blotting, immunohistochemistry, and autophagosomes by electron microscopy. RESULTS Uterine myocytes proliferated during the early stage of gestation with a peak at Day 2, whereas myocyte hypertrophy with increased cellular organelle production occurred gradually in later stages of pregnancy. Postpartum autophagy developed abruptly in uterine myocytes without obvious apoptosis. CONCLUSION Autophagy of myocytes may play an important role in uterine involution. These results have implications for our understanding of myometrial functional adaptations during pregnancy and the physiological role of autophagy in the uterine remodeling events in the postpartum period.
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Affiliation(s)
- Keng-Fu Hsu
- Department of Obstetrics and Gynecology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Hsien-An Pan
- Department of Obstetrics and Gynecology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yu-Yun Hsu
- Department of Nursing, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ching-Ming Wu
- Department of Cell Biology and Anatomy, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Wen-Ju Chung
- Department of Obstetrics and Gynecology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Institute of Oral Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Soon-Cen Huang
- Department of Obstetrics and Gynecology, Chi Mei Medical Center, Liouying, Tainan, Taiwan; Department of Obstetrics and Gynecology, College of Medicine, Taipei Medical University, Taipei, Taiwan.
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Zhou Y, Wang D, Gao X, Lew K, Richards AM, Wang P. mTORC2 phosphorylation of Akt1: a possible mechanism for hydrogen sulfide-induced cardioprotection. PLoS One 2014; 9:e99665. [PMID: 24949720 PMCID: PMC4064967 DOI: 10.1371/journal.pone.0099665] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 05/16/2014] [Indexed: 01/05/2023] Open
Abstract
Hydrogen sulfide (H2S) is known to have cardiac protective effects through Akt activation. Akt acts as a 'central sensor' for myocyte survival or death; its activity is regulated by multiple kinases including PI3K, mTORC2, PDK1 and phosphatases including PTEN, PP2A and PHLPPL. Based on the previous finding that PI3K inhibitor LY294002 abolishes H2S-induced Akt phosphorylation and cardioprotection, it is accepted that PI3K is the mediator of H2S-induced Akt phosphorylation. However, LY294002 inhibits both PI3K and mTOR, and PI3K only recruits Akt to the membrane where Akt is phosphorylated by Akt kinases. We undertook a series of experiments to further evaluate the role of mTORC2, PDK1, PTEN, PP2A and PHLPPL in H2S-induced Akt phosphorylation and cardioprotection, which, we believe, has not been investigated before. Hearts from adult Sprague-Dawley rats were isolated and subjected to (i) normoxia, (ii) global ischemia and (iii) ischemia/reperfusion in the presence or absence of 50 µM of H2S donor NaHS. Cardiac mechanical function and lactate dehydrogenase (LDH) release were assessed. All hearts also were Western analyzed at the end of perfusion for Akt and a panel of appropriate Akt regulators and targets. Hearts pretreated with 50 µM NaHS had improved function at the end of reperfusion (Rate pressure product; 19±4×10(3) vs. 10±3×10(3) mmHg/min, p<0.05) and reduced cell injury (LDH release 19±10 vs. 170±87 mU/ml p<0.05) compared to untreated hearts. NaHS significantly increased phospho-Akt, phospho-mTOR, phospho-Bim and Bcl-2 in reperfused hearts (P<0.05). Furthermore using H9c2 cells we demonstrate that NaHS pretreatment reduces apoptosis following hypoxia/re-oxygenation. Importantly, PP242, a specific mTOR inhibitor, abolished both cardioprotection and protein phosphorylation in isolated heart and reduced apoptotic effects in H9c2 cells. Treating hearts with NaHS only during reperfusion produced less cardioprotection through a similar mechanism. These data suggest mTORC2 phosphorylation of Akt is a key mediator of H2S-induced cardioprotection in I/R.
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Affiliation(s)
- Yue Zhou
- Cardiovascular Research Institute, National University of Singapore, Singapore, Singapore
| | - Daying Wang
- Department of Cardiology, Putuo Hospital, Shanghai, China
| | - Xiufang Gao
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - Karsheng Lew
- Cardiovascular Research Institute, National University of Singapore, Singapore, Singapore
| | - Arthur Mark Richards
- Cardiovascular Research Institute, National University of Singapore, Singapore, Singapore
| | - Peipei Wang
- Cardiovascular Research Institute, National University of Singapore, Singapore, Singapore
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Bian Z, Liao H, Zhang Y, Wu Q, Zhou H, Yang Z, Fu J, Wang T, Yan L, Shen D, Li H, Tang Q. Never in mitosis gene A related kinase-6 attenuates pressure overload-induced activation of the protein kinase B pathway and cardiac hypertrophy. PLoS One 2014; 9:e96095. [PMID: 24763737 PMCID: PMC3999101 DOI: 10.1371/journal.pone.0096095] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Accepted: 04/02/2014] [Indexed: 12/31/2022] Open
Abstract
Cardiac hypertrophy appears to be a specialized form of cellular growth that involves the proliferation control and cell cycle regulation. NIMA (never in mitosis, gene A)-related kinase-6 (Nek6) is a cell cycle regulatory gene that could induce centriole duplication, and control cell proliferation and survival. However, the exact effect of Nek6 on cardiac hypertrophy has not yet been reported. In the present study, the loss- and gain-of-function experiments were performed in Nek6 gene-deficient (Nek6−/−) mice and Nek6 overexpressing H9c2 cells to clarify whether Nek6 which promotes the cell cycle also mediates cardiac hypertrophy. Cardiac hypertrophy was induced by transthoracic aorta constriction (TAC) and then evaluated by echocardiography, pathological and molecular analyses in vivo. We got novel findings that the absence of Nek6 promoted cardiac hypertrophy, fibrosis and cardiac dysfunction, which were accompanied by a significant activation of the protein kinase B (Akt) signaling in an experimental model of TAC. Consistent with this, the overexpression of Nek6 prevented hypertrophy in H9c2 cells induced by angiotonin II and inhibited Akt signaling in vitro. In conclusion, our results demonstrate that the cell cycle regulatory gene Nek6 is also a critical signaling molecule that helps prevent cardiac hypertrophy and inhibits the Akt signaling pathway.
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Affiliation(s)
- Zhouyan Bian
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Haihan Liao
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Yan Zhang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Qingqing Wu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Heng Zhou
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Zheng Yang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Jinrong Fu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Teng Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Ling Yan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Difei Shen
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Hongliang Li
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Qizhu Tang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- Cardiovascular Research Institute of Wuhan University, Wuhan, Hubei Province, P. R. China
- * E-mail:
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Zhang Y, Zhou L, Li TC, Duan H, Yu P, Wang HY. Ultrastructural features of endometrial-myometrial interface and its alteration in adenomyosis. Int J Clin Exp Pathol 2014; 7:1469-1477. [PMID: 24817942 PMCID: PMC4014226] [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] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 02/27/2014] [Indexed: 06/03/2023]
Abstract
The endometrial-myometrial interface (EMI) is a specific functional region of uterus. However, our knowledge on EMI ultrastructure both in normal uterus and adenomyosis is far from enough to understand its pathology. In this study, used the samples of EMI and outer myometrium (OM) from the adenomyosis hysterectomy specimens and the subjects from the control uteri, we prospectively compared the ultrastructure of myocytes from EMI and OM, the ultrastructural changes of EMI between the proliferative and secretory phases, and the ultrastructural difference of EMI between adenomyosis and the control group. In both adenomyosis and control group, there were differences in ultrastructure between myocytes from EMI and OM. Specifically, the myocytes from EMI were rich in organelles. In contrast, the myocytes from OM had abundant contractile structural components. In the proliferative phase, the myocytes from EMI in adenomyosis had significantly smaller cell and nucleus diameter than those from the control group, but in the secretory phase, the difference was not significant. In the control group, the various ultrastructural features of myocytes from EMI including the mean diameter of cell and nuclei and the myofilaments/cytoplasm ratio exhibited cyclical changes, but in adenomyosis, the normal cyclical changes were absent. In conclusions, there are significant ultrastructural differences between the myocytes from EMI and OM. The myocytes in women with adenomyosis were significantly different to the control subjects, primarily because the normal cyclical changes were absent.
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Affiliation(s)
- Ying Zhang
- Department of Gynecology Minimally Invasive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical UniversityQi He Lou Street 17#, Dongcheng District, Beijing, China, Post code: 100006
| | - Li Zhou
- Department of Gynecology Minimally Invasive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical UniversityQi He Lou Street 17#, Dongcheng District, Beijing, China, Post code: 100006
| | - Tin C Li
- Department of Reproductive Medicine and Surgery, The Jessop Wing Sheffield Teaching HospitalThe Jessop Wing Tree Root Walk, Sheffield, United Kingdom, Post code: S10 2SF
| | - Hua Duan
- Department of Gynecology Minimally Invasive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical UniversityQi He Lou Street 17#, Dongcheng District, Beijing, China, Post code: 100006
| | - Pei Yu
- Department of Gynecology Minimally Invasive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical UniversityQi He Lou Street 17#, Dongcheng District, Beijing, China, Post code: 100006
| | - Hong Y Wang
- Department of Pathology, Fu Wai Hospital Cardiovascular Institute, Chinese Academy of Medical Sciences Peking Union Medical CollegeBeijing, China, Post code: 100037
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Fu RH, Harn HJ, Liu SP, Chen CS, Chang WL, Chen YM, Huang JE, Li RJ, Tsai SY, Hung HS, Shyu WC, Lin SZ, Wang YC. n-butylidenephthalide protects against dopaminergic neuron degeneration and α-synuclein accumulation in Caenorhabditis elegans models of Parkinson's disease. PLoS One 2014; 9:e85305. [PMID: 24416384 PMCID: PMC3885701 DOI: 10.1371/journal.pone.0085305] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 11/25/2013] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Parkinson's disease (PD) is the second most common degenerative disorder of the central nervous system that impairs motor skills and cognitive function. To date, the disease has no effective therapies. The identification of new drugs that provide benefit in arresting the decline seen in PD patients is the focus of much recent study. However, the lengthy time frame for the progression of neurodegeneration in PD increases both the time and cost of examining potential therapeutic compounds in mammalian models. An alternative is to first evaluate the efficacy of compounds in Caenorhabditis elegans models, which reduces examination time from months to days. n-Butylidenephthalide is the naturally-occurring component derived from the chloroform extract of Angelica sinensis. It has been shown to have anti-tumor and anti-inflammatory properties, but no reports have yet described the effects of n-butylidenephthalide on PD. The aim of this study was to assess the potential for n-butylidenephthalide to improve PD in C. elegans models. METHODOLOGY/PRINCIPAL FINDINGS In the current study, we employed a pharmacological strain that expresses green fluorescent protein specifically in dopaminergic neurons (BZ555) and a transgenic strain that expresses human α-synuclein in muscle cells (OW13) to investigate the antiparkinsonian activities of n-butylidenephthalide. Our results demonstrate that in PD animal models, n-butylidenephthalide significantly attenuates dopaminergic neuron degeneration induced by 6-hydroxydopamine; reduces α-synuclein accumulation; recovers lipid content, food-sensing behavior, and dopamine levels; and prolongs life-span of 6-hydroxydopamine treatment, thus revealing its potential as a possible antiparkinsonian drug. n-Butylidenephthalide may exert its effects by blocking egl-1 expression to inhibit apoptosis pathways and by raising rpn-6 expression to enhance the activity of proteasomes. CONCLUSIONS/SIGNIFICANCE n-Butylidenephthalide may be one of the effective neuroprotective agents for PD.
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Affiliation(s)
- Ru-Huei Fu
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
- Center for Neuropsychiatry, China Medical University Hospital, Taichung, Taiwan
| | - Horng-Jyh Harn
- Department of Pathology, China Medical University Hospital, Taichung, Taiwan
| | - Shih-Ping Liu
- Center for Neuropsychiatry, China Medical University Hospital, Taichung, Taiwan
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan
| | - Chang-Shi Chen
- Department of Biochemistry and Molecular Biology, National Cheng Kung University, Tainan, Taiwan
| | - Wen-Lin Chang
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
| | - Yue-Mi Chen
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
| | - Jing-En Huang
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
| | - Rong-Jhu Li
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
| | - Sung-Yu Tsai
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
| | - Huey-Shan Hung
- Center for Neuropsychiatry, China Medical University Hospital, Taichung, Taiwan
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan
| | - Woei-Cherng Shyu
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
- Center for Neuropsychiatry, China Medical University Hospital, Taichung, Taiwan
| | - Shinn-Zong Lin
- Graduate Institute of Immunology, China Medical University, Taichung, Taiwan
- Center for Neuropsychiatry, China Medical University Hospital, Taichung, Taiwan
- Department of Neurosurgery, China Medical University Beigang Hospital, Yunlin, Taiwan
- Department of Neurosurgery, Tainan Municipal An-Nan Hospital-China Medical University, Tainan, Taiwan
| | - Yu-Chi Wang
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan
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Jenkins Y, Sun TQ, Markovtsov V, Foretz M, Li W, Nguyen H, Li Y, Pan A, Uy G, Gross L, Baltgalvis K, Yung SL, Gururaja T, Kinoshita T, Owyang A, Smith IJ, McCaughey K, White K, Godinez G, Alcantara R, Choy C, Ren H, Basile R, Sweeny DJ, Xu X, Issakani SD, Carroll DC, Goff DA, Shaw SJ, Singh R, Boros LG, Laplante MA, Marcotte B, Kohen R, Viollet B, Marette A, Payan DG, Kinsella TM, Hitoshi Y. AMPK activation through mitochondrial regulation results in increased substrate oxidation and improved metabolic parameters in models of diabetes. PLoS One 2013; 8:e81870. [PMID: 24339975 PMCID: PMC3855387 DOI: 10.1371/journal.pone.0081870] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 10/19/2013] [Indexed: 12/28/2022] Open
Abstract
Modulation of mitochondrial function through inhibiting respiratory complex I activates a key sensor of cellular energy status, the 5'-AMP-activated protein kinase (AMPK). Activation of AMPK results in the mobilization of nutrient uptake and catabolism for mitochondrial ATP generation to restore energy homeostasis. How these nutrient pathways are affected in the presence of a potent modulator of mitochondrial function and the role of AMPK activation in these effects remain unclear. We have identified a molecule, named R419, that activates AMPK in vitro via complex I inhibition at much lower concentrations than metformin (IC50 100 nM vs 27 mM, respectively). R419 potently increased myocyte glucose uptake that was dependent on AMPK activation, while its ability to suppress hepatic glucose production in vitro was not. In addition, R419 treatment of mouse primary hepatocytes increased fatty acid oxidation and inhibited lipogenesis in an AMPK-dependent fashion. We have performed an extensive metabolic characterization of its effects in the db/db mouse diabetes model. In vivo metabolite profiling of R419-treated db/db mice showed a clear upregulation of fatty acid oxidation and catabolism of branched chain amino acids. Additionally, analyses performed using both 13C-palmitate and 13C-glucose tracers revealed that R419 induces complete oxidation of both glucose and palmitate to CO2 in skeletal muscle, liver, and adipose tissue, confirming that the compound increases mitochondrial function in vivo. Taken together, our results show that R419 is a potent inhibitor of complex I and modulates mitochondrial function in vitro and in diabetic animals in vivo. R419 may serve as a valuable molecular tool for investigating the impact of modulating mitochondrial function on nutrient metabolism in multiple tissues and on glucose and lipid homeostasis in diabetic animal models.
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Affiliation(s)
- Yonchu Jenkins
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Tian-Qiang Sun
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Vadim Markovtsov
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Marc Foretz
- Inserm, U1016, Institut Cochin, Paris, France
- CNRS, UMR8104, Paris, France
- Université Paris Descartes, Sorbonne Paris cité, Paris, France
| | - Wei Li
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Henry Nguyen
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Yingwu Li
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Alison Pan
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Gerald Uy
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Lisa Gross
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Kristen Baltgalvis
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Stephanie L. Yung
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Tarikere Gururaja
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Taisei Kinoshita
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Alexander Owyang
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Ira J. Smith
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Kelly McCaughey
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Kathy White
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Guillermo Godinez
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Raniel Alcantara
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Carmen Choy
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Hong Ren
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Rachel Basile
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - David J. Sweeny
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Xiang Xu
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Sarkiz D. Issakani
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - David C. Carroll
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Dane A. Goff
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Simon J. Shaw
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Rajinder Singh
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Laszlo G. Boros
- SiDMAP, LLC, Los Angeles, California, United States of America
- Department of Pediatrics, Los Angeles Biomedical Research Institute (LABIOMED) at the Harbor-UCLA Medical Center, Torrance, California, United States of America
| | - Marc-André Laplante
- Department of Medicine, Faculty of Medicine, Cardiology Axis of the Institut Universitaire de Cardiologie et de Pneumologie de Québec (Hôpital Laval), Québec, Québec, Canada
| | - Bruno Marcotte
- Department of Medicine, Faculty of Medicine, Cardiology Axis of the Institut Universitaire de Cardiologie et de Pneumologie de Québec (Hôpital Laval), Québec, Québec, Canada
| | - Rita Kohen
- Department of Medicine, Faculty of Medicine, Cardiology Axis of the Institut Universitaire de Cardiologie et de Pneumologie de Québec (Hôpital Laval), Québec, Québec, Canada
| | - Benoit Viollet
- Inserm, U1016, Institut Cochin, Paris, France
- CNRS, UMR8104, Paris, France
- Université Paris Descartes, Sorbonne Paris cité, Paris, France
| | - André Marette
- Department of Medicine, Faculty of Medicine, Cardiology Axis of the Institut Universitaire de Cardiologie et de Pneumologie de Québec (Hôpital Laval), Québec, Québec, Canada
| | - Donald G. Payan
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Todd M. Kinsella
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
| | - Yasumichi Hitoshi
- Rigel Pharmaceuticals, Inc., South San Francisco, California, United States of America
- * E-mail:
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Castillero E, Alamdari N, Lecker SH, Hasselgren PO. Suppression of atrogin-1 and MuRF1 prevents dexamethasone-induced atrophy of cultured myotubes. Metabolism 2013; 62:1495-502. [PMID: 23866982 DOI: 10.1016/j.metabol.2013.05.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 05/28/2013] [Accepted: 05/29/2013] [Indexed: 12/22/2022]
Abstract
OBJECTIVE The mechanistic role of the ubiquitin ligases atrogin-1 and MuRF1 in glucocorticoid-induced muscle wasting is not fully understood. Here, we tested the hypothesis that glucocorticoid-induced muscle atrophy is at least in part linked to atrogin-1 and MuRF1 expression and that the ubiquitin ligases are regulated by compensatory mechanisms. METHODS The expression of atrogin-1 and MuRF1 was suppressed individually or in combination in cultured L6 myotubes by using siRNA technique. Myotubes were treated with dexamethasone followed by determination of mRNA and protein levels for atrogin-1 and MuRF1, protein synthesis and degradation rates, and myotube morphology. RESULTS Suppression of atrogin-1 resulted in increased expression of MuRF1 and vice versa, suggesting that the ubiquitin ligases are regulated by compensatory mechanisms. Simultaneous suppression of atrogin-1 and MuRF1 resulted in myotube hypertrophy, mainly reflecting stimulated protein synthesis, and prevented dexamethasone-induced myotube atrophy, mainly reflecting inhibited protein degradation. CONCLUSIONS The results provide evidence for a link between upregulated atrogin-1 and MuRF1 expression and glucocorticoid-induced muscle atrophy. The study also suggests that atrogin-1 and MuRF1 levels are regulated by compensatory mechanisms and that inhibition of both ubiquitin ligases may be needed to prevent glucocorticoid-induced muscle proteolysis and atrophy.
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Affiliation(s)
- Estibaliz Castillero
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
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Rojana-udomsart A, Mitrpant C, Bundell C, Price L, Luo YB, Fabian V, Wilton SD, Hollingsworth P, Mastaglia FL. Complement-mediated muscle cell lysis: a possible mechanism of myonecrosis in anti-SRP associated necrotizing myopathy (ASANM). J Neuroimmunol 2013; 264:65-70. [PMID: 24041831 DOI: 10.1016/j.jneuroim.2013.08.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 08/08/2013] [Accepted: 08/20/2013] [Indexed: 11/19/2022]
Abstract
The mechanism of necrotizing myopathy associated with antibodies to signal recognition particle (SRP) remains unclear. We investigated the effect of anti-SRP+serum and complement on cell viability in myoblast cultures. Cell viability was only slightly reduced by incubation with anti-SRP+serum compared with control serum. However, the addition of fresh complement resulted in a marked reduction in cell survival. Surface immunostaining for SRP, C3c and C5b-9 was demonstrated in cultures pre-incubated with anti-SRP+serum and complement, and in muscle biopsies from patients with myopathy. These findings provide further support for a complement-dependent antibody-mediated mechanism in anti-SRP associated myopathy.
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Affiliation(s)
- Arada Rojana-udomsart
- Australian Neuro-muscular Research Institute and Centre for Neuromuscular and Neurological Disorders, The University of Western Australia, Queen Elizabeth II Medical Centre, Perth, WA, Australia
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Diaper DC, Adachi Y, Lazarou L, Greenstein M, Simoes FA, Di Domenico A, Solomon DA, Lowe S, Alsubaie R, Cheng D, Buckley S, Humphrey DM, Shaw CE, Hirth F. Drosophila TDP-43 dysfunction in glia and muscle cells cause cytological and behavioural phenotypes that characterize ALS and FTLD. Hum Mol Genet 2013; 22:3883-93. [PMID: 23727833 PMCID: PMC3766182 DOI: 10.1093/hmg/ddt243] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD) are neurodegenerative disorders that are characterized by cytoplasmic aggregates and nuclear clearance of TAR DNA-binding protein 43 (TDP-43). Studies in Drosophila, zebrafish and mouse demonstrate that the neuronal dysfunction of TDP-43 is causally related to disease formation. However, TDP-43 aggregates are also observed in glia and muscle cells, which are equally affected in ALS and FTLD; yet, it is unclear whether glia- or muscle-specific dysfunction of TDP-43 contributes to pathogenesis. Here, we show that similar to its human homologue, Drosophila TDP-43, Tar DNA-binding protein homologue (TBPH), is expressed in glia and muscle cells. Muscle-specific knockdown of TBPH causes age-related motor abnormalities, whereas muscle-specific gain of function leads to sarcoplasmic aggregates and nuclear TBPH depletion, which is accompanied by behavioural deficits and premature lethality. TBPH dysfunction in glia cells causes age-related motor deficits and premature lethality. In addition, both loss and gain of Drosophila TDP-43 alter mRNA expression levels of the glutamate transporters Excitatory amino acid transporter 1 (EAAT1) and EAAT2. Taken together, our results demonstrate that both loss and gain of TDP-43 function in muscle and glial cells can lead to cytological and behavioural phenotypes in Drosophila that also characterize ALS and FTLD and identify the glutamate transporters EAAT1/2 as potential direct targets of TDP-43 function. These findings suggest that together with neuronal pathology, glial- and muscle-specific TDP-43 dysfunction may directly contribute to the aetiology and progression of TDP-43-related ALS and FTLD.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | - Christopher E. Shaw
- Department of Clinical Neuroscience, Institute of Psychiatry, MRC Centre for Neurodegeneration Research, King's College London, London SE5 8AF, UK
| | - Frank Hirth
- Department of Neuroscience and
- To whom correspondence should be addressed at: Department of Neuroscience, Institute of Psychiatry, King's College London, PO Box 37, 16 De Crespigny Park, SE5 8AF London, UK. Tel: +44 2078480786; Fax: +44 2077080017;
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Renato M, Bertacco E, Franchin C, Arrigoni G, Rattazzi M. Proteomic analysis of interstitial aortic valve cells acquiring a pro-calcific profile. Methods Mol Biol 2013; 1005:95-107. [PMID: 23606251 DOI: 10.1007/978-1-62703-386-2_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Cell-driven processes are now considered of relevance for the pathogenesis of aortic stenosis. In particular, during calcific valve degeneration, interstitial valve cells (VIC) resident in the leaflet can acquire an osteogenic/pro-calcific profile and actively contribute to matrix mineralization. The proteomic study described in this chapter is undertaken to investigate modifications in the proteome of bovine aortic VIC acquiring a calcifying phenotype. This approach can be useful to clarify cellular pathways involved in VIC pro-calcific differentiation and identify innovative therapeutic targets.
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Yamamoto R, Matsushita M, Kitoh H, Masuda A, Ito M, Katagiri T, Kawai T, Ishiguro N, Ohno K. Clinically applicable antianginal agents suppress osteoblastic transformation of myogenic cells and heterotopic ossifications in mice. J Bone Miner Metab 2013; 31:26-33. [PMID: 23011467 DOI: 10.1007/s00774-012-0380-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Accepted: 07/18/2012] [Indexed: 01/09/2023]
Abstract
Fibrodysplasia ossificans progressiva (FOP) is a rare autosomal dominant disorder characterized by progressive heterotopic ossification. FOP is caused by a gain-of-function mutation in ACVR1 encoding the bone morphogenetic protein type II receptor, ACVR1/ALK2. The mutant receptor causes upregulation of a transcriptional factor, Id1. No therapy is available to prevent the progressive heterotopic ossification in FOP. In an effort to search for clinically applicable drugs for FOP, we screened 1,040 FDA-approved drugs for suppression of the Id1 promoter activated by the mutant ACVR1/ALK2 in C2C12 cells. We found that that two antianginal agents, fendiline hydrochloride and perhexiline maleate, suppressed the Id1 promoter in a dose-dependent manner. The drugs also suppressed the expression of native Id1 mRNA and alkaline phosphatase in a dose-dependent manner. Perhexiline but not fendiline downregulated phosphorylation of Smad 1/5/8 driven by bone morphogenetic protein (BMP)-2. We implanted crude BMPs in muscles of ddY mice and fed them fendiline or perhexiline for 30 days. Mice taking perhexiline showed a 38.0 % reduction in the volume of heterotopic ossification compared to controls, whereas mice taking fendiline showed a slight reduction of heterotopic ossification. Fendiline, perhexiline, and their possible derivatives are potentially applicable to clinical practice to prevent devastating heterotopic ossification in FOP.
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Affiliation(s)
- Ryuichiro Yamamoto
- Department of Neurogenetics, Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine, 65 Tsurumai, Showa-ku, Nagoya, 466-8550, Japan
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Scheele C, Nielsen S, Kelly M, Broholm C, Nielsen AR, Taudorf S, Pedersen M, Fischer CP, Pedersen BK. Satellite cells derived from obese humans with type 2 diabetes and differentiated into myocytes in vitro exhibit abnormal response to IL-6. PLoS One 2012; 7:e39657. [PMID: 22761857 PMCID: PMC3383673 DOI: 10.1371/journal.pone.0039657] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Accepted: 05/24/2012] [Indexed: 01/08/2023] Open
Abstract
Obesity and type 2 diabetes are associated with chronically elevated systemic levels of IL-6, a pro-inflammatory cytokine with a role in skeletal muscle metabolism that signals through the IL-6 receptor (IL-6Rα). We hypothesized that skeletal muscle in obesity-associated type 2 diabetes develops a resistance to IL-6. By utilizing western blot analysis, we demonstrate that IL-6Rα protein was down regulated in skeletal muscle biopsies from obese persons with and without type 2 diabetes. To further investigate the status of IL-6 signaling in skeletal muscle in obesity-associated type 2 diabetes, we isolated satellite cells from skeletal muscle of people that were healthy (He), obese (Ob) or were obese and had type 2 diabetes (DM), and differentiated them in vitro into myocytes. Down-regulation of IL-6Rα was conserved in Ob myocytes. In addition, acute IL-6 administration for 30, 60 and 120 minutes, resulted in a down-regulation of IL-6Rα protein in Ob myocytes compared to both He myocytes (P<0.05) and DM myocytes (P<0.05). Interestingly, there was a strong time-dependent regulation of IL-6Rα protein in response to IL-6 (P<0.001) in He myocytes, not present in the other groups. Assessing downstream signaling, DM, but not Ob myocytes demonstrated a trend towards an increased protein phosphorylation of STAT3 in DM myocytes (P = 0.067) accompanied by a reduced SOCS3 protein induction (P<0.05), in response to IL-6 administration. Despite this loss of negative control, IL-6 failed to increase AMPKα2 activity and IL-6 mRNA expression in DM myocytes. There was no difference in fusion capacity of myocytes between cell groups. Our data suggest that negative control of IL-6 signaling is increased in myocytes in obesity, whereas a dysfunctional IL-6 signaling is established further downstream of IL-6Rα in DM myocytes, possibly representing a novel mechanism by which skeletal muscle function is compromised in type 2 diabetes.
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Affiliation(s)
- Camilla Scheele
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
| | - Søren Nielsen
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Meghan Kelly
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Christa Broholm
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anders Rinnov Nielsen
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Sarah Taudorf
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Maria Pedersen
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Christian P. Fischer
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Bente Klarlund Pedersen
- The Centre of Inflammation and Metabolism at Department of Infectious Diseases and Copenhagen Muscle Research Centre, Rigshospitalet, The Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
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Aguer C, Gambarotta D, Mailloux RJ, Moffat C, Dent R, McPherson R, Harper ME. Galactose enhances oxidative metabolism and reveals mitochondrial dysfunction in human primary muscle cells. PLoS One 2011; 6:e28536. [PMID: 22194845 PMCID: PMC3240634 DOI: 10.1371/journal.pone.0028536] [Citation(s) in RCA: 185] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 11/10/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Human primary myotubes are highly glycolytic when cultured in high glucose medium rendering it difficult to study mitochondrial dysfunction. Galactose is known to enhance mitochondrial metabolism and could be an excellent model to study mitochondrial dysfunction in human primary myotubes. The aim of the present study was to 1) characterize the effect of differentiating healthy human myoblasts in galactose on oxidative metabolism and 2) determine whether galactose can pinpoint a mitochondrial malfunction in post-diabetic myotubes. METHODOLOGY/PRINCIPAL FINDINGS Oxygen consumption rate (OCR), lactate levels, mitochondrial content, citrate synthase and cytochrome C oxidase activities, and AMPK phosphorylation were determined in healthy myotubes differentiated in different sources/concentrations of carbohydrates: 25 mM glucose (high glucose (HG)), 5 mM glucose (low glucose (LG)) or 10 mM galactose (GAL). Effect of carbohydrates on OCR was also determined in myotubes derived from post-diabetic patients and matched obese non-diabetic subjects. OCR was significantly increased whereas anaerobic glycolysis was significantly decreased in GAL myotubes compared to LG or HG myotubes. This increased OCR in GAL myotubes occurred in conjunction with increased cytochrome C oxidase activity and expression, as well as increased AMPK phosphorylation. OCR of post-diabetic myotubes was not different than that of obese non-diabetic myotubes when differentiated in LG or HG. However, whereas GAL increased OCR in obese non-diabetic myotubes, it did not affect OCR in post-diabetic myotubes, leading to a significant difference in OCR between groups. The lack of an increase in OCR in post-diabetic myotubes differentiated in GAL was in relation with unaltered cytochrome C oxidase activity levels or AMPK phosphorylation. CONCLUSIONS/SIGNIFICANCE Our results indicate that differentiating human primary myoblasts in GAL enhances aerobic metabolism. Because this cell culture model elicited an abnormal response in cells from post-diabetic patients, it may be useful in further studies of the molecular mechanisms of mitochondrial dysfunction.
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Affiliation(s)
- Céline Aguer
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada
| | - Daniela Gambarotta
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada
| | - Ryan J. Mailloux
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada
| | - Cynthia Moffat
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada
| | - Robert Dent
- Ottawa Hospital Weight Management Clinic, Ottawa, Ontario, Canada
| | - Ruth McPherson
- Division of Cardiology, University of Ottawa Heart Institute, Ottawa, Ontario, Canada
| | - Mary-Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada
- * E-mail:
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Green CJ, Pedersen M, Pedersen BK, Scheele C. Elevated NF-κB activation is conserved in human myocytes cultured from obese type 2 diabetic patients and attenuated by AMP-activated protein kinase. Diabetes 2011; 60:2810-9. [PMID: 21911750 PMCID: PMC3198079 DOI: 10.2337/db11-0263] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To examine whether the inflammatory phenotype found in obese and diabetic individuals is preserved in isolated, cultured myocytes and to assess the effectiveness of pharmacological AMP-activated protein kinase (AMPK) activation upon the attenuation of inflammation in these myocytes. RESEARCH DESIGN AND METHODS Muscle precursor cells were isolated from four age-matched subject groups: 1) nonobese, normal glucose tolerant; 2) obese, normal glucose tolerant; 3) obese, impaired glucose tolerant; and 4) obese, type 2 diabetes (T2D). The level of inflammation (nuclear factor-κB [NF-κB] signaling) and effect of pharmacological AMPK activation was assessed by Western blots, enzyme-linked immunosorbent assay, and radioactive assays (n = 5 for each subject group). RESULTS NF-κB-p65 DNA binding activity was significantly elevated in myocytes from obese T2D patients compared with nonobese control subjects. This correlated to a significant increase in tumor necrosis factor-α concentration in cell culture media. In addition, insulin-stimulated glucose uptake was completely suppressed in myocytes from obese impaired glucose tolerant and T2D subjects. It is interesting that activation of AMPK by A769662 attenuated NF-κB-p65 DNA binding activity in obese T2D cells to levels measured in nonobese myocytes; however, this had no effect on insulin sensitivity of the cells. CONCLUSIONS This work provides solid evidence that differentiated human muscle precursor cells maintain in vivo phenotypes of inflammation and insulin resistance and that obesity alone may not be sufficient to establish inflammation in these cells. It is important that we demonstrate an anti-inflammatory role for AMPK in these human cells. Despite attenuation of NF-κB activity by AMPK, insulin resistance in obese T2D cells remained, suggesting factors in addition to inflammation may contribute to the insulin resistance phenotype in muscle cells.
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Affiliation(s)
- Charlotte J Green
- Centre of Inflammation and Metabolism, Department of Infectious Diseases, Rigshospitalet, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
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Gaiser AM, Kaiser CJO, Haslbeck V, Richter K. Downregulation of the Hsp90 system causes defects in muscle cells of Caenorhabditis elegans. PLoS One 2011; 6:e25485. [PMID: 21980476 PMCID: PMC3182237 DOI: 10.1371/journal.pone.0025485] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 09/06/2011] [Indexed: 11/28/2022] Open
Abstract
The ATP-dependent molecular chaperone Hsp90 is required for the activation of a variety of client proteins involved in various cellular processes. Despite the abundance of known client proteins, functions of Hsp90 in the organismal context are not fully explored. In Caenorhabditis elegans, Hsp90 (DAF-21) has been implicated in the regulation of the stress-resistant dauer state, in chemosensing and in gonad formation. In a C. elegans strain carrying a DAF-21 mutation with a lower ATP turnover, we observed motility defects. Similarly, a reduction of DAF-21 levels in wild type nematodes leads to reduced motility and induction of the muscular stress response. Furthermore, aggregates of the myosin MYO-3 are visible in muscle cells, if DAF-21 is depleted, implying a role of Hsp90 in the maintenance of muscle cell functionality. Similar defects can also be observed upon knockdown of the Hsp90-cochaperone UNC-45. In life nematodes YFP-DAF-21 localizes to the I-band and the M-line of the muscular ultrastructure, but the protein is not stably attached there. The Hsp90-cofactor UNC-45-CFP contrarily can be found in all bands of the nematode muscle ultrastructure and stably associates with the UNC-54 containing A-band. Thus, despite the physical interaction between DAF-21 and UNC-45, apparently the two proteins are not always localized to the same muscular structures. While UNC-45 can stably bind to myofilaments in the muscular ultrastructure, Hsp90 (DAF-21) appears to participate in the maintenance of muscle structures as a transiently associated diffusible factor.
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Affiliation(s)
- Andreas M. Gaiser
- Department of Chemistry and Center for Integrated Protein Science Munich (CIPSM) and Technische Universität München, München, Germany
| | - Christoph J. O. Kaiser
- Department of Chemistry and Center for Integrated Protein Science Munich (CIPSM) and Technische Universität München, München, Germany
| | - Veronika Haslbeck
- Department of Chemistry and Center for Integrated Protein Science Munich (CIPSM) and Technische Universität München, München, Germany
| | - Klaus Richter
- Department of Chemistry and Center for Integrated Protein Science Munich (CIPSM) and Technische Universität München, München, Germany
- * E-mail:
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Burkewitz K, Choe K, Strange K. Hypertonic stress induces rapid and widespread protein damage in C. elegans. Am J Physiol Cell Physiol 2011; 301:C566-76. [PMID: 21613604 PMCID: PMC3174568 DOI: 10.1152/ajpcell.00030.2011] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [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: 01/31/2011] [Accepted: 05/25/2011] [Indexed: 11/22/2022]
Abstract
Proteostasis is defined as the homeostatic mechanisms that maintain the function of all cytoplasmic proteins. We recently demonstrated that the capacity of the proteostasis network is a critical factor that defines the limits of cellular and organismal survival in hypertonic environments. The current studies were performed to determine the extent of protein damage induced by cellular water loss. Using worm strains expressing fluorescently tagged foreign and endogenous proteins and proteins with temperature-sensitive point mutations, we demonstrate that hypertonic stress causes aggregation and misfolding of diverse proteins in multiple cell types. Protein damage is rapid. Aggregation of a polyglutamine yellow fluorescent protein reporter is observable with <1 h of hypertonic stress, and aggregate volume doubles approximately every 10 min. Aggregate formation is irreversible and occurs after as little as 10 min of exposure to hypertonic conditions. To determine whether endogenous proteins are aggregated by hypertonic stress, we quantified the relative amount of total cellular protein present in detergent-insoluble extracts. Exposure for 4 h to 400 mM or 500 mM NaCl induced a 55-120% increase in endogenous protein aggregation. Inhibition of insulin signaling or acclimation to mild hypertonic stress increased survival under extreme hypertonic conditions and prevented aggregation of endogenous proteins. Our results demonstrate that hypertonic stress causes widespread and dramatic protein damage and that cells have a significant capacity to remodel the network of proteins that function to maintain proteostasis. These findings have important implications for understanding how cells cope with hypertonic stress and other protein-damaging stressors.
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Affiliation(s)
- Kris Burkewitz
- Boylan Center for Cellular and Molecular Physiology, Mount Desert Island Biological Laboratory, Salisbury Cove, Maine 04672, USA
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Kawagoe S, Higuchi T, Meng XL, Shimada Y, Shimizu H, Hirayama R, Fukuda T, Chang H, Nakahata T, Fukada SI, Ida H, Kobayashi H, Ohashi T, Eto Y. Generation of induced pluripotent stem (iPS) cells derived from a murine model of Pompe disease and differentiation of Pompe-iPS cells into skeletal muscle cells. Mol Genet Metab 2011; 104:123-8. [PMID: 21703893 DOI: 10.1016/j.ymgme.2011.05.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 05/29/2011] [Accepted: 05/29/2011] [Indexed: 01/04/2023]
Abstract
Our study is the first to demonstrate the ability to generate iPS cells from a mouse model of Pompe disease. Initially, mouse tail tip fibroblasts were harvested from male, 8-week-old (GAA) knockout mice, and three reprogramming factors (Oct3/4, Sox2 and Klf4) were transfected into the isolated donor cells using a retroviral vector. These iPS cells also showed decreased levels of GAA enzymatic activity and strong positive staining with periodic acid-Schiff (indicating the accumulation of glycogen) and acid phosphatase (lysosomal activation marker). Pompe-iPS cells were differentiated into skeletal muscle cells in Matrigel®-coated plates. Spindle-shaped skeletal muscle cells were successfully generated from Pompe-iPS cells and showed spontaneous contraction and positive staining with the myosin heavy chain antibody. Electron microscopic analysis of the skeletal muscle cells showed typical morphological features, including Z-bands, I-bands, A-bands and H-bands, which were visible in wild-type and Pompe cells. Furthermore, Pompe skeletal muscle cells accumulated massive glycogen in lysosomes. This study indicates that the iPS and skeletal muscle cells generated in this study could also be a useful disease model for studies investigating the pathogenesis and treatment of skeletal muscle in Pompe disease.
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Affiliation(s)
- Shiho Kawagoe
- Department of Genetic Diseases and Genomic Science, The Jikei University School of Medicine, Tokyo, Japan
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Öberg AI, Yassin K, Csikasz RI, Dehvari N, Shabalina IG, Hutchinson DS, Wilcke M, Östenson CG, Bengtsson T. Shikonin increases glucose uptake in skeletal muscle cells and improves plasma glucose levels in diabetic Goto-Kakizaki rats. PLoS One 2011; 6:e22510. [PMID: 21818330 PMCID: PMC3144218 DOI: 10.1371/journal.pone.0022510] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Accepted: 06/28/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND There is considerable interest in identifying compounds that can improve glucose homeostasis. Skeletal muscle, due to its large mass, is the principal organ for glucose disposal in the body and we have investigated here if shikonin, a naphthoquinone derived from the Chinese plant Lithospermum erythrorhizon, increases glucose uptake in skeletal muscle cells. METHODOLOGY/PRINCIPAL FINDINGS Shikonin increases glucose uptake in L6 skeletal muscle myotubes, but does not phosphorylate Akt, indicating that in skeletal muscle cells its effect is medaited via a pathway distinct from that used for insulin-stimulated uptake. Furthermore we find no evidence for the involvement of AMP-activated protein kinase in shikonin induced glucose uptake. Shikonin increases the intracellular levels of calcium in these cells and this increase is necessary for shikonin-mediated glucose uptake. Furthermore, we found that shikonin stimulated the translocation of GLUT4 from intracellular vesicles to the cell surface in L6 myoblasts. The beneficial effect of shikonin on glucose uptake was investigated in vivo by measuring plasma glucose levels and insulin sensitivity in spontaneously diabetic Goto-Kakizaki rats. Treatment with shikonin (10 mg/kg intraperitoneally) once daily for 4 days significantly decreased plasma glucose levels. In an insulin sensitivity test (s.c. injection of 0.5 U/kg insulin), plasma glucose levels were significantly lower in the shikonin-treated rats. In conclusion, shikonin increases glucose uptake in muscle cells via an insulin-independent pathway dependent on calcium. CONCLUSIONS/SIGNIFICANCE Shikonin increases glucose uptake in skeletal muscle cells via an insulin-independent pathway dependent on calcium. The beneficial effects of shikonin on glucose metabolism, both in vitro and in vivo, show that the compound possesses properties that make it of considerable interest for developing novel treatment of type 2 diabetes.
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Affiliation(s)
- Anette I. Öberg
- Department of Physiology, Arrhenius Laboratories F3, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Kamal Yassin
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Robert I. Csikasz
- Department of Physiology, Arrhenius Laboratories F3, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Nodi Dehvari
- Department of Physiology, Arrhenius Laboratories F3, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Irina G. Shabalina
- Department of Physiology, Arrhenius Laboratories F3, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Dana S. Hutchinson
- Department of Pharmacology, Monash University, Parkville, Victoria, Australia
- Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | | | - Claes-Göran Östenson
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Tore Bengtsson
- Department of Physiology, Arrhenius Laboratories F3, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
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Luigetti M, Conte A, Madia F, Modoni A, Montano N, Lauriola L, Tasca G, Del Grande A, Tonali PA, Sabatelli M. Abnormal vascular smooth muscle cell proliferation in sural nerve biopsy from a patient with sensorimotor axonal neuropathy. Neuropathology 2010; 31:197-8. [PMID: 21134003 DOI: 10.1111/j.1440-1789.2010.01179.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ihrler S, Rath C, Zengel P, Kirchner T, Harrison JD, Weiler C. Pathogenesis of sialadenosis: possible role of functionally deficient myoepithelial cells. ACTA ACUST UNITED AC 2010; 110:218-23. [PMID: 20580282 DOI: 10.1016/j.tripleo.2010.03.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Revised: 03/04/2010] [Accepted: 03/10/2010] [Indexed: 11/16/2022]
Abstract
OBJECTIVES The pathogenesis of acinar enlargement in sialadenosis is obscure. As myoepithelial cells had been reported to show degenerative changes, we decided to investigate the possible role of functionally deficient myoepithelial cells in the development of sialadenosis. STUDY DESIGN This study was a morphometric analysis of glands immunohistochemically stained for CK14, alpha-actin, and Ki67 in 10 cases of sialadenosis and 11 normal parotids. RESULTS In sialadenosis, acini were much larger; there was a minor decrease in the density of the distribution of myoepithelial cells stained for CK14 and a major decrease in the density of the distribution and thickness of the myofilament component of myoepithelial cells stained for alpha-actin; and the proliferation of acinar and myoepithelial cells was reduced. CONCLUSIONS Our results demonstrate a major loss and thinning of the myofilament component of the myoepithelial cells and thereby a loss of mechanical support for the acini in sialadenosis. This possibly allows acinar cells to expand as secretory granules accumulate intracellularly to produce the great acinar enlargement. This functional myoepithelial insufficiency is possibly a consequence of an autonomic neuropathy secondary to severe metabolic or hormonal disorders.
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Affiliation(s)
- Stephan Ihrler
- Institute of Pathology, Ludwig Maximilian University, Munich, Germany
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Mehasseb MK, Taylor AH, Pringle JH, Bell SC, Habiba M. Enhanced invasion of stromal cells from adenomyosis in a three-dimensional coculture model is augmented by the presence of myocytes from affected uteri. Fertil Steril 2010; 94:2547-51. [PMID: 20537634 DOI: 10.1016/j.fertnstert.2010.04.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 03/15/2010] [Accepted: 04/08/2010] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To compare endometrial stromal cell invasion from women with and without adenomyosis and the effect of myometrial cells using a three-dimensional coculture. DESIGN Case-controlled blinded comparison. SETTING University department. PATIENT(S) Premenopausal women with and without uterine adenomyosis. INTERVENTION(S) Human endometrial stromal and myometrial cells were grown in a three-dimensional coculture with crossover between cells from uteri with and without adenomyosis. Surface-enhanced laser desorption/ionization-time of flight-mass spectrometry proteomic analysis was performed on culture supernatants. MAIN OUTCOME MEASURE(S) Depth of stromal cell invasion into collagen matrix and protein expression profiles. RESULT(S) The depth of invasion for adenomyosis stromal cells (AS) was statistically significantly higher than controls (CS) whether grown on plain collagen, control muscle (CM), or adenomyosis muscle (AM). Coculture with AM enhanced invasion of both CS and AS. Enhanced invasion by AS was more marked in cocultures with AM than CM. Proteomic analysis identified differences that may account for the invasiveness and also many similarities between secretory products related to the disease status. CONCLUSION(S) Enhanced stromal invasion in adenomyosis is influenced by the myometrium in the in vitro coculture model. This suggests that adenomyosis may be a disease of both the endometrial stroma and myometrium.
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Affiliation(s)
- Mohamed Khairy Mehasseb
- Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, United Kingdom.
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