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Hayashi H, Izumiya Y, Ishida T, Arima Y, Hayashi O, Yoshiyama M, Tsujita K, Fukuda D. Exosomal miR206 Secreted From Growing Muscle Promotes Angiogenic Response in Endothelial Cells. Circ J 2024; 88:425-433. [PMID: 38008429 DOI: 10.1253/circj.cj-23-0353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
BACKGROUND Resistance exercise is beneficial in patients with lower extremity arterial disease. Muscle-derived exosomes contain many types of signaling molecules, including microRNAs (miRNAs). Here, we tested the hypothesis that exosomal miRNAs secreted by growing muscles promote an angiogenic response in endothelial cells (ECs).Methods and Results: Skeletal muscle-specific conditional Akt1 transgenic (Akt1-TG) mice, in which skeletal muscle growth can be induced were used as a model of resistance training. Remarkable skeletal muscle growth was observed in mice 2 weeks after gene activation. The protein amount in exosomes secreted by growing muscles did not differ between Akt1-TG and control mice. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway frequency analysis of 4,665 target genes, identified using an miRNA array miRNAs, revealed a significant increase in Akt and its downstream signaling pathway genes. Among the upregulated miRNAs, miR1, miR133, and miR206 were significantly upregulated in the serum of Akt1-TG mice. miR206 was also increased in insulin-like growth factor (IGF)-1-stimulated hypertrophied myotubes. Exogenous supplementation of exosomal miR206 to human umbilical vein ECs promoted angiogenesis, as assessed using the spheroid assay, and increased the expression of angiogenesis-related transcripts. CONCLUSIONS Exosomal miR206 is upregulated in the blood of Akt1-TG mice and in IGF-stimulated cultured myotubes. Exogenous supplementation of miR206 promoted an angiogenic response in ECs. Our data suggest that miR206 secreted from growing muscles acts on ECs and promotes angiogenesis.
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Affiliation(s)
- Hiroya Hayashi
- Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine
| | - Yasuhiro Izumiya
- Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine
| | - Toshifumi Ishida
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University
| | - Yuichiro Arima
- Laboratory of Developmental Cardiology, International Research Center for Medical Sciences, Kumamoto University
| | - Ou Hayashi
- Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine
| | - Minoru Yoshiyama
- Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine
| | - Kenichi Tsujita
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University
| | - Daiju Fukuda
- Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine
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2
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Merz KE, Hwang J, Zhou C, Veluthakal R, McCown EM, Hamilton A, Oh E, Dai W, Fueger PT, Jiang L, Huss JM, Thurmond DC. Enrichment of the exocytosis protein STX4 in skeletal muscle remediates peripheral insulin resistance and alters mitochondrial dynamics via Drp1. Nat Commun 2022; 13:424. [PMID: 35058456 PMCID: PMC8776765 DOI: 10.1038/s41467-022-28061-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 01/05/2022] [Indexed: 12/15/2022] Open
Abstract
Mitochondrial dysfunction is implicated in skeletal muscle insulin resistance. Syntaxin 4 (STX4) levels are reduced in human diabetic skeletal muscle, and global transgenic enrichment of STX4 expression improves insulin sensitivity in mice. Here, we show that transgenic skeletal muscle-specific STX4 enrichment (skmSTX4tg) in mice reverses established insulin resistance and improves mitochondrial function in the context of diabetogenic stress. Specifically, skmSTX4tg reversed insulin resistance caused by high-fat diet (HFD) without altering body weight or food consumption. Electron microscopy of wild-type mouse muscle revealed STX4 localisation at or proximal to the mitochondrial membrane. STX4 enrichment prevented HFD-induced mitochondrial fragmentation and dysfunction through a mechanism involving STX4-Drp1 interaction and elevated AMPK-mediated phosphorylation at Drp1 S637, which favors fusion. Our findings challenge the dogma that STX4 acts solely at the plasma membrane, revealing that STX4 localises at/proximal to and regulates the function of mitochondria in muscle. These results establish skeletal muscle STX4 enrichment as a candidate therapeutic strategy to reverse peripheral insulin resistance.
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Affiliation(s)
- Karla E Merz
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
- Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA, USA
- Amgen, Thousand Oaks, CA, USA
| | - Jinhee Hwang
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Chunxue Zhou
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Rajakrishnan Veluthakal
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Erika M McCown
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Angelica Hamilton
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Eunjin Oh
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Wenting Dai
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Patrick T Fueger
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
- Comprehensive Metabolic Phenotyping Core, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Lei Jiang
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
| | - Janice M Huss
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA
- Washington University School of Medicine, St. Louis, MO, USA
| | - Debbie C Thurmond
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA, USA.
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3
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Merz KE, Tunduguru R, Ahn M, Salunkhe VA, Veluthakal R, Hwang J, Bhattacharya S, McCown EM, Garcia PA, Zhou C, Oh E, Yoder SM, Elmendorf JS, Thurmond DC. Changes in Skeletal Muscle PAK1 Levels Regulate Tissue Crosstalk to Impact Whole Body Glucose Homeostasis. Front Endocrinol (Lausanne) 2022; 13:821849. [PMID: 35222279 PMCID: PMC8881144 DOI: 10.3389/fendo.2022.821849] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/13/2022] [Indexed: 12/13/2022] Open
Abstract
Skeletal muscle accounts for ~80% of insulin-stimulated glucose uptake. The Group I p21-activated kinase 1 (PAK1) is required for the non-canonical insulin-stimulated GLUT4 vesicle translocation in skeletal muscle cells. We found that the abundances of PAK1 protein and its downstream effector in muscle, ARPC1B, are significantly reduced in the skeletal muscle of humans with type 2 diabetes, compared to the non-diabetic controls, making skeletal muscle PAK1 a candidate regulator of glucose homeostasis. Although whole-body PAK1 knockout mice exhibit glucose intolerance and are insulin resistant, the contribution of skeletal muscle PAK1 in particular was unknown. As such, we developed inducible skeletal muscle-specific PAK1 knockout (skmPAK1-iKO) and overexpression (skmPAK1-iOE) mouse models to evaluate the role of PAK1 in skeletal muscle insulin sensitivity and glucose homeostasis. Using intraperitoneal glucose tolerance and insulin tolerance testing, we found that skeletal muscle PAK1 is required for maintaining whole body glucose homeostasis. Moreover, PAK1 enrichment in GLUT4-myc-L6 myoblasts preserves normal insulin-stimulated GLUT4 translocation under insulin resistance conditions. Unexpectedly, skmPAK1-iKO also showed aberrant plasma insulin levels following a glucose challenge. By applying conditioned media from PAK1-enriched myotubes or myoblasts to β-cells in culture, we established that a muscle-derived circulating factor(s) could enhance β-cell function. Taken together, these data suggest that PAK1 levels in the skeletal muscle can regulate not only skeletal muscle insulin sensitivity, but can also engage in tissue crosstalk with pancreatic β-cells, unveiling a new molecular mechanism by which PAK1 regulates whole-body glucose homeostasis.
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Affiliation(s)
- Karla E. Merz
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Ragadeepthi Tunduguru
- Department of Diabetes Complications and Metabolism, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Miwon Ahn
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Vishal A. Salunkhe
- Sahlgrenska Academy, Institute of Neuroscience and Physiology, Metabolism Research Unit, University of Gothenburg, Gothenburg, Sweden
| | - Rajakrishnan Veluthakal
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Jinhee Hwang
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Supriyo Bhattacharya
- Division of Translational Bioinformatics, City of Hope, Duarte, CA, United States
| | - Erika M. McCown
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Pablo A. Garcia
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Chunxue Zhou
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Eunjin Oh
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Stephanie M. Yoder
- Global Scientific Communications, Eli Lilly & Company, Indianapolis, IN, United States
| | - Jeffrey S. Elmendorf
- Department of Anatomy, Cell Biology and Physiology, Center for Diabetes and Metabolic Disease, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Debbie C. Thurmond
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute of City of Hope, Duarte, CA, United States
- *Correspondence: Debbie C. Thurmond,
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Bruno NE, Nwachukwu JC, Hughes DC, Srinivasan S, Hawkins R, Sturgill D, Hager GL, Hurst S, Sheu SS, Bodine SC, Conkright MD, Nettles KW. Activation of Crtc2/Creb1 in skeletal muscle enhances weight loss during intermittent fasting. FASEB J 2021; 35:e21999. [PMID: 34748223 DOI: 10.1096/fj.202100171r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 09/22/2021] [Accepted: 10/04/2021] [Indexed: 11/11/2022]
Abstract
The Creb-Regulated Transcriptional Coactivator (Crtc) family of transcriptional coregulators drive Creb1-mediated transcription effects on metabolism in many tissues, but the in vivo effects of Crtc2/Creb1 transcription on skeletal muscle metabolism are not known. Skeletal muscle-specific overexpression of Crtc2 (Crtc2 mice) induced greater mitochondrial activity, metabolic flux capacity for both carbohydrates and fats, improved glucose tolerance and insulin sensitivity, and increased oxidative capacity, supported by upregulation of key metabolic genes. Crtc2 overexpression led to greater weight loss during alternate day fasting (ADF), selective loss of fat rather than lean mass, maintenance of higher energy expenditure during the fast and reduced binge-eating during the feeding period. ADF downregulated most of the mitochondrial electron transport genes, and other regulators of mitochondrial function, that were substantially reversed by Crtc2-driven transcription. Glucocorticoids acted with AMPK to drive atrophy and mitophagy, which was reversed by Crtc2/Creb1 signaling. Crtc2/Creb1-mediated signaling coordinates metabolic adaptations in skeletal muscle that explain how Crtc2/Creb1 regulates metabolism and weight loss.
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Affiliation(s)
- Nelson E Bruno
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - Jerome C Nwachukwu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - David C Hughes
- Section for Endocrinology and Metabolism, Department of Internal Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Sathish Srinivasan
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - Richard Hawkins
- Department of Cancer Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - David Sturgill
- Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, NIH, Bethesda, Maryland, USA
| | - Gordon L Hager
- Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, NIH, Bethesda, Maryland, USA
| | - Stephen Hurst
- Department of Medicine, Center for Translational Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Shey-Shing Sheu
- Department of Medicine, Center for Translational Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Sue C Bodine
- Section for Endocrinology and Metabolism, Department of Internal Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Michael D Conkright
- Department of Cancer Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - Kendall W Nettles
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
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Mobley CB, Vechetti IJ, Valentino TR, McCarthy JJ. CORP: Using transgenic mice to study skeletal muscle physiology. J Appl Physiol (1985) 2020; 128:1227-1239. [PMID: 32105520 DOI: 10.1152/japplphysiol.00021.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The development of tissue-specific inducible transgenic mice has provided a powerful tool to study gene function and cell biology in almost any tissue of interest at any given time within the animal's life. The purpose of this review is to describe how to use two different inducible transgenic systems, the Cre-loxP system and the Tet-ON/OFF system, that can be used to study skeletal muscle physiology. Myofiber- and satellite cell-specific Cre-loxP transgenic mice are described as is how these mice can be used to knockout a gene of interest or to deplete satellite cells in adult skeletal muscle, respectively. A myofiber-specific Tet-ON system is described as is how such mice can be used to overexpress a gene of interest or to label myonuclei. How to effectively breed and genotype the transgenic mice are also described in detail. The hope is this review will provide the basic information necessary to facilitate the incorporation of tissue-specific inducible transgenic mice into a skeletal muscle research program.
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Affiliation(s)
- C Brooks Mobley
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky
| | - Ivan J Vechetti
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky
| | - Taylor R Valentino
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky
| | - John J McCarthy
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky
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6
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BDNF is a mediator of glycolytic fiber-type specification in mouse skeletal muscle. Proc Natl Acad Sci U S A 2019; 116:16111-16120. [PMID: 31320589 DOI: 10.1073/pnas.1900544116] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) influences the differentiation, plasticity, and survival of central neurons and likewise, affects the development of the neuromuscular system. Besides its neuronal origin, BDNF is also a member of the myokine family. However, the role of skeletal muscle-derived BDNF in regulating neuromuscular physiology in vivo remains unclear. Using gain- and loss-of-function animal models, we show that muscle-specific ablation of BDNF shifts the proportion of muscle fibers from type IIB to IIX, concomitant with elevated slow muscle-type gene expression. Furthermore, BDNF deletion reduces motor end plate volume without affecting neuromuscular junction (NMJ) integrity. These morphological changes are associated with slow muscle function and a greater resistance to contraction-induced fatigue. Conversely, BDNF overexpression promotes a fast muscle-type gene program and elevates glycolytic fiber number. These findings indicate that BDNF is required for fiber-type specification and provide insights into its potential modulation as a therapeutic target in muscle diseases.
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7
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Zhang J, Oh E, Merz KE, Aslamy A, Veluthakal R, Salunkhe VA, Ahn M, Tunduguru R, Thurmond DC. DOC2B promotes insulin sensitivity in mice via a novel KLC1-dependent mechanism in skeletal muscle. Diabetologia 2019; 62:845-859. [PMID: 30707251 PMCID: PMC6451670 DOI: 10.1007/s00125-019-4824-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/14/2018] [Indexed: 12/11/2022]
Abstract
AIMS/HYPOTHESIS Skeletal muscle accounts for >80% of insulin-stimulated glucose uptake; dysfunction of this process underlies insulin resistance and type 2 diabetes. Insulin sensitivity is impaired in mice deficient in the double C2 domain β (DOC2B) protein, while whole-body overexpression of DOC2B enhances insulin sensitivity. Whether insulin sensitivity in the skeletal muscle is affected directly by DOC2B or is secondary to an effect on other tissues is unknown; the underlying molecular mechanisms also remain unclear. METHODS Human skeletal muscle samples from non-diabetic or type 2 diabetic donors were evaluated for loss of DOC2B during diabetes development. For in vivo analysis, new doxycycline-inducible skeletal-muscle-specific Doc2b-overexpressing mice fed standard or high-fat diets were evaluated for insulin and glucose tolerance, and insulin-stimulated GLUT4 accumulation at the plasma membrane (PM). For in vitro analyses, a DOC2B-overexpressing L6-GLUT4-myc myoblast/myotube culture system was coupled with an insulin resistance paradigm. Biochemical and molecular biology methods such as site-directed mutagenesis, co-immunoprecipitation and mass spectrometry were used to identify the molecular mechanisms linking insulin stimulation to DOC2B. RESULTS We identified loss of DOC2B (55% reduction in RNA and 40% reduction in protein) in the skeletal muscle of human donors with type 2 diabetes. Furthermore, inducible enrichment of DOC2B in skeletal muscle of transgenic mice enhanced whole-body glucose tolerance (AUC decreased by 25% for female mice) and peripheral insulin sensitivity (area over the curve increased by 20% and 26% for female and male mice, respectively) in vivo, underpinned by enhanced insulin-stimulated GLUT4 accumulation at the PM. Moreover, DOC2B enrichment in skeletal muscle protected mice from high-fat-diet-induced peripheral insulin resistance, despite the persistence of obesity. In L6-GLUT4-myc myoblasts, DOC2B enrichment was sufficient to preserve normal insulin-stimulated GLUT4 accumulation at the PM in cells exposed to diabetogenic stimuli. We further identified that DOC2B is phosphorylated on insulin stimulation, enhancing its interaction with a microtubule motor protein, kinesin light chain 1 (KLC1). Mutation of Y301 in DOC2B blocked the insulin-stimulated phosphorylation of DOC2B and interaction with KLC1, and it blunted the ability of DOC2B to enhance insulin-stimulated GLUT4 accumulation at the PM. CONCLUSIONS/INTERPRETATION These results suggest that DOC2B collaborates with KLC1 to regulate insulin-stimulated GLUT4 accumulation at the PM and regulates insulin sensitivity. Our observation provides a basis for pursuing DOC2B as a novel drug target in the muscle to prevent/treat type 2 diabetes.
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Affiliation(s)
- Jing Zhang
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
- Anwita Biosciences Inc, San Carlos, CA, USA
| | - Eunjin Oh
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
| | - Karla E Merz
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
| | - Arianne Aslamy
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Rajakrishnan Veluthakal
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
| | - Vishal A Salunkhe
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
| | - Miwon Ahn
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
| | - Ragadeepthi Tunduguru
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA
- Department of Diabetes Complications and Metabolism, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Debbie C Thurmond
- Department of Molecular and Cellular Endocrinology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Road, Duarte, CA, 91010, USA.
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Iwata M, Englund DA, Wen Y, Dungan CM, Murach KA, Vechetti IJ, Mobley CB, Peterson CA, McCarthy JJ. A novel tetracycline-responsive transgenic mouse strain for skeletal muscle-specific gene expression. Skelet Muscle 2018; 8:33. [PMID: 30368256 PMCID: PMC6204038 DOI: 10.1186/s13395-018-0181-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 10/16/2018] [Indexed: 11/21/2022] Open
Abstract
Background The tetracycline-responsive system (Tet-ON/OFF) has proven to be a valuable tool for manipulating gene expression in an inducible, temporal, and tissue-specific manner. The purpose of this study was to create and characterize a new transgenic mouse strain utilizing the human skeletal muscle α-actin (HSA) promoter to drive skeletal muscle-specific expression of the reverse tetracycline transactivator (rtTA) gene which we have designated as the HSA-rtTA mouse. Methods To confirm the HSA-rtTA mouse was capable of driving skeletal muscle-specific expression, we crossed the HSA-rtTA mouse with the tetracycline-responsive histone H2B-green fluorescent protein (H2B-GFP) transgenic mouse in order to label myonuclei. Results Reverse transcription-PCR confirmed skeletal muscle-specific expression of rtTA mRNA, while single-fiber analysis showed highly effective GFP labeling of myonuclei in both fast- and slow-twitch skeletal muscles. Pax7 immunohistochemistry of skeletal muscle cross-sections revealed no appreciable GFP expression in satellite cells. Conclusions The HSA-rtTA transgenic mouse allows for robust, specific, and inducible gene expression across muscles of different fiber types. The HSA-rtTA mouse provides a powerful tool to manipulate gene expression in skeletal muscle.
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Affiliation(s)
- Masahiro Iwata
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Physiology, College of Medicine, University of Kentucky, 800 Rose Street, Medical Science Building, Rm: MS-607A, Lexington, KY, 40536, USA.,Department of Rehabilitation, Faculty of Health Sciences, Nihon Fukushi University, 26-2 Higashihaemi-cho, Handa, 475-0012, Japan
| | - Davis A Englund
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Rehabilitation Sciences, College of Health Sciences, University of Kentucky, Lexington, KY, 40536, USA
| | - Yuan Wen
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Physiology, College of Medicine, University of Kentucky, 800 Rose Street, Medical Science Building, Rm: MS-607A, Lexington, KY, 40536, USA
| | - Cory M Dungan
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Rehabilitation Sciences, College of Health Sciences, University of Kentucky, Lexington, KY, 40536, USA
| | - Kevin A Murach
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Rehabilitation Sciences, College of Health Sciences, University of Kentucky, Lexington, KY, 40536, USA
| | - Ivan J Vechetti
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Physiology, College of Medicine, University of Kentucky, 800 Rose Street, Medical Science Building, Rm: MS-607A, Lexington, KY, 40536, USA
| | - Christopher B Mobley
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Physiology, College of Medicine, University of Kentucky, 800 Rose Street, Medical Science Building, Rm: MS-607A, Lexington, KY, 40536, USA
| | - Charlotte A Peterson
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA.,Department of Rehabilitation Sciences, College of Health Sciences, University of Kentucky, Lexington, KY, 40536, USA
| | - John J McCarthy
- The Center for Muscle Biology, University of Kentucky, Lexington, KY, 40536, USA. .,Department of Physiology, College of Medicine, University of Kentucky, 800 Rose Street, Medical Science Building, Rm: MS-607A, Lexington, KY, 40536, USA.
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9
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Onoue Y, Izumiya Y, Hanatani S, Ishida T, Arima Y, Yamamura S, Kimura Y, Araki S, Ishii M, Nakamura T, Oimatsu Y, Sakamoto K, Yamamoto E, Kojima S, Kaikita K, Tsujita K. Akt1-Mediated Muscle Growth Promotes Blood Flow Recovery After Hindlimb Ischemia by Enhancing Heme Oxygenase-1 in Neighboring Cells. Circ J 2018; 82:2905-2912. [DOI: 10.1253/circj.cj-18-0135] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yoshiro Onoue
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Yasuhiro Izumiya
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Shinsuke Hanatani
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Toshifumi Ishida
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Yuichiro Arima
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Satoru Yamamura
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Yuichi Kimura
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Satoshi Araki
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Masanobu Ishii
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Taishi Nakamura
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Yu Oimatsu
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Kenji Sakamoto
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Eiichiro Yamamoto
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Sunao Kojima
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Koichi Kaikita
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
| | - Kenichi Tsujita
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University
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10
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Luo J, Arbely E, Zhang J, Chou C, Uprety R, Chin JW, Deiters A. Genetically encoded optical activation of DNA recombination in human cells. Chem Commun (Camb) 2018; 52:8529-32. [PMID: 27277957 PMCID: PMC5048445 DOI: 10.1039/c6cc03934k] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We developed two tightly regulated, light-activated Cre recombinase enzymes through site-specific incorporation of two genetically-encoded photocaged amino acids in human cells. Excellent optical off to on switching of DNA recombination was achieved. Furthermore, we demonstrated precise spatial control of Cre recombinase through patterned illumination.
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Affiliation(s)
- J Luo
- Department of Chemistry, University of Pittsburgh, 219 Parkman Ave, Pittsburgh, Pennsylvania 15260, USA.
| | - E Arbely
- Medical Research Council Laboratory of Molecular Biology, Francis Crick Ave, Cambridge CB20QH, UK and Department of Chemistry and The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - J Zhang
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - C Chou
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - R Uprety
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - J W Chin
- Medical Research Council Laboratory of Molecular Biology, Francis Crick Ave, Cambridge CB20QH, UK
| | - A Deiters
- Department of Chemistry, University of Pittsburgh, 219 Parkman Ave, Pittsburgh, Pennsylvania 15260, USA.
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11
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Wu CL, Satomi Y, Walsh K. RNA-seq and metabolomic analyses of Akt1-mediated muscle growth reveals regulation of regenerative pathways and changes in the muscle secretome. BMC Genomics 2017; 18:181. [PMID: 28209124 PMCID: PMC5314613 DOI: 10.1186/s12864-017-3548-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Accepted: 02/02/2017] [Indexed: 12/20/2022] Open
Abstract
Background Skeletal muscle is a major regulator of systemic metabolism as it serves as the major site for glucose disposal and the main reservoir for amino acids. With aging, cachexia, starvation, and myositis, there is a preferential loss of fast glycolytic muscle fibers. We previously reported a mouse model in which a constitutively-active Akt transgene is induced to express in a subset of muscle groups leading to the hypertrophy of type IIb myofibers with an accompanying increase in strength. This muscle growth protects mice in various cardio-metabolic disease models, but little is known about the underlying cellular and molecular mechanisms by which fast-twitch muscle impacts disease processes and regulates distant tissues. In the present study, poly (A) + tail mRNA-seq and non-targeted metabolomics were performed to characterize the transcriptome and metabolome of the hypertrophic gastrocnemius muscle from Akt1-transgenic mice. Results Combined metabolomics and transcriptomic analyses revealed that Akt1-induced muscle growth mediated a metabolic shift involving reductions in glycolysis and oxidative phosphorylation, but enhanced pentose phosphate pathway activation and increased branch chain amino acid accumulation. Pathway analysis for the 4,027 differentially expressed genes in muscle identified enriched signaling pathways involving growth, cell cycle regulation, and inflammation. Consistent with a regenerative transcriptional signature, the transgenic muscle tissue was found to be comprised of fibers with centralized nuclei that are positive for embryonic myosin heavy chain. Immunohistochemical analysis also revealed the presence of inflammatory cells associated with the regenerating fibers. Signal peptide prediction analysis revealed 240 differentially expressed in muscle transcripts that potentially encode secreted proteins. A number of these secreted factors have signaling properties that are consistent with the myogenic, metabolic and cardiovascular-protective properties that have previously been associated with type IIb muscle growth. Conclusions This study provides the first extensive transcriptomic sequencing/metabolomics analysis for a model of fast-twitch myofiber growth. These data reveal that enhanced Akt signaling promotes the activation of pathways that are important for the production of proteins and nucleic acids. Numerous transcripts potentially encoding muscle secreted proteins were identified, indicating the importance of fast-twitch muscle in inter-tissue communication. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-3548-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Chia-Ling Wu
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, 715 Albany Street, W-611, Boston, MA, 02118, USA
| | - Yoshinori Satomi
- Integrated Technology Research Laboratories, Takeda Pharmaceutical Co. Ltd., 26-1, Muraoka-Higashi 2-chome, Fujisawa, Kanagawa, 251-8555, Japan
| | - Kenneth Walsh
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, 715 Albany Street, W-611, Boston, MA, 02118, USA.
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12
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Sanchez-Encinales V, Cozar-Castellano I, Garcia-Ocaña A, Perdomo G. Targeted delivery of HGF to the skeletal muscle improves glucose homeostasis in diet-induced obese mice. J Physiol Biochem 2015; 71:795-805. [PMID: 26507644 DOI: 10.1007/s13105-015-0444-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 10/16/2015] [Indexed: 01/21/2023]
Abstract
Hepatocyte growth factor (HGF) is a cytokine that increases glucose transport ex vivo in skeletal muscle. The aim of this work was to decipher the impact of whether conditional overexpression of HGF in vivo could improve glucose homeostasis and insulin sensitivity in mouse skeletal muscle. Following tetracyclin administration, muscle HGF levels were augmented threefold in transgenic mice (SK-HGF) compared to control mice without altering plasma HGF levels. In conditions of normal diet, SK-HGF mice showed no differences in body weight, plasma triglycerides, blood glucose, plasma insulin and glucose tolerance compared to control mice. Importantly, obese SK-HGF mice exhibited improved whole-body glucose tolerance independently of changes in body weight or plasma triglyceride levels compared to control mice. This effect on glucose homeostasis was associated with significantly higher (∼80%) levels of phosphorylated protein kinase B in muscles from SK-HGF mice compared to control mice. In conclusion, muscle expression of HGF counteracts obesity-mediated muscle insulin resistance and improves glucose tolerance in mice.
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Affiliation(s)
| | - Irene Cozar-Castellano
- Research Unit, University Hospital "Puerta del Mar", Cádiz, Spain.,Instituto de Genética y Biología Molecular, Universidad de Valladolid-CSIC, Valladolid, Spain
| | - Adolfo Garcia-Ocaña
- Diabetes, Obesity and Metabolism Institute, The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, Atran 5 Box 1152, 1 Gustave L. Levy Place, New York, NY, 10029, USA.
| | - Germán Perdomo
- Research Unit, University Hospital "Puerta del Mar", Cádiz, Spain. .,School of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Science-Technology Campus in the Old Weapons Factory, Sabatini Building, Avenue of Charles III, s/n, 45071, Toledo, Spain.
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13
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Cheng KK, Akasaki Y, Lecommandeur E, Lindsay RT, Murfitt S, Walsh K, Griffin JL. Metabolomic analysis of akt1-mediated muscle hypertrophy in models of diet-induced obesity and age-related fat accumulation. J Proteome Res 2014; 14:342-52. [PMID: 25231380 PMCID: PMC4286153 DOI: 10.1021/pr500756u] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Akt1
is a serine/threonine kinase that promotes cell growth and
survival. Previously, Akt1 activation in a double transgenic (DTG)
mouse model fed a high-fat/high-sucrose (HF/HS) diet was found to
promote type IIb muscle growth and to lead to a significant reduction
in obesity. Here, we have used metabolomics to examine the metabolic
perturbations in blood serum and liver and gastrocnemius tissues of
the DTG mice. Multivariate statistics highlighted consistent metabolic
changes in gastrocnemius muscle following Akt1 activation, which included
significant reductions of serine and histidine-containing dipeptides
(anserine and carnosine), in addition to increased concentrations
of phosphorylated sugars. In addition, Akt1-mediated regression in
obesity could be associated with increased glycolysis in gastrocnemius
muscle as well as increased gluconeogenesis, glycogenolysis, and ketogenesis
in the liver. In old DTG animals, Akt1 activation was found to improve
glucose metabolism and confer a beneficial effect in the regression
of age-related fat accumulation. This study identifies metabolic changes
induced by Akt1-mediated muscle growth and demonstrates a cross-talk
between distant organs that leads to a regression of fat mass. The
current findings indicate that agents that promote Akt1 induction
in muscle have utility in the regression of obesity.
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Affiliation(s)
- Kian-Kai Cheng
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge , Cambridge CB2 1GA, United Kingdom
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14
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Hanatani S, Izumiya Y, Araki S, Rokutanda T, Kimura Y, Walsh K, Ogawa H. Akt1-mediated fast/glycolytic skeletal muscle growth attenuates renal damage in experimental kidney disease. J Am Soc Nephrol 2014; 25:2800-11. [PMID: 25012168 DOI: 10.1681/asn.2013091025] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Muscle wasting is frequently observed in patients with kidney disease, and low muscle strength is associated with poor outcomes in these patients. However, little is known about the effects of skeletal muscle growth per se on kidney diseases. In this study, we utilized a skeletal muscle-specific, inducible Akt1 transgenic (Akt1 TG) mouse model that promotes the growth of functional skeletal muscle independent of exercise to investigate the effects of muscle growth on kidney diseases. Seven days after Akt1 activation in skeletal muscle, renal injury was induced by unilateral ureteral obstruction (UUO) in Akt1 TG and wild-type (WT) control mice. The expression of atrogin-1, an atrophy-inducing gene in skeletal muscle, was upregulated 7 days after UUO in WT mice but not in Akt1 TG mice. UUO-induced renal interstitial fibrosis, tubular injury, apoptosis, and increased expression of inflammatory, fibrosis-related, and adhesion molecule genes were significantly diminished in Akt1 TG mice compared with WT mice. An increase in the activating phosphorylation of eNOS in the kidney accompanied the attenuation of renal damage by myogenic Akt1 activation. Treatment with the NOS inhibitor L-NAME abolished the protective effect of skeletal muscle Akt activation on obstructive kidney disease. In conclusion, Akt1-mediated muscle growth reduces renal damage in a model of obstructive kidney disease. This improvement appears to be mediated by an increase in eNOS signaling in the kidney. Our data support the concept that loss of muscle mass during kidney disease can contribute to renal failure, and maintaining muscle mass may improve clinical outcome.
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Affiliation(s)
- Shinsuke Hanatani
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan; and
| | - Yasuhiro Izumiya
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan; and
| | - Satoshi Araki
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan; and
| | - Taku Rokutanda
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan; and
| | - Yuichi Kimura
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan; and
| | - Kenneth Walsh
- Department of Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts
| | - Hisao Ogawa
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan; and
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15
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Bruno NE, Kelly KA, Hawkins R, Bramah-Lawani M, Amelio AL, Nwachukwu JC, Nettles KW, Conkright MD. Creb coactivators direct anabolic responses and enhance performance of skeletal muscle. EMBO J 2014; 33:1027-43. [PMID: 24674967 PMCID: PMC4193935 DOI: 10.1002/embj.201386145] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 02/01/2014] [Accepted: 02/20/2014] [Indexed: 12/27/2022] Open
Abstract
During the stress response to intense exercise, the sympathetic nervous system (SNS) induces rapid catabolism of energy reserves through the release of catecholamines and subsequent activation of protein kinase A (PKA). Paradoxically, chronic administration of sympathomimetic drugs (β-agonists) leads to anabolic adaptations in skeletal muscle, suggesting that sympathetic outflow also regulates myofiber remodeling. Here, we show that β-agonists or catecholamines released during intense exercise induce Creb-mediated transcriptional programs through activation of its obligate coactivators Crtc2 and Crtc3. In contrast to the catabolic activity normally associated with SNS function, activation of the Crtc/Creb transcriptional complex by conditional overexpression of Crtc2 in the skeletal muscle of transgenic mice fostered an anabolic state of energy and protein balance. Crtc2-overexpressing mice have increased myofiber cross-sectional area, greater intramuscular triglycerides and glycogen content. Moreover, maximal exercise capacity was enhanced after induction of Crtc2 expression in transgenic mice. Collectively these findings demonstrate that the SNS-adrenergic signaling cascade coordinates a transient catabolic stress response during high-intensity exercise, which is followed by transcriptional reprogramming that directs anabolic changes for recovery and that augments subsequent exercise performance.
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Affiliation(s)
- Nelson E Bruno
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
- The Center for Diabetes and Metabolic Diseases, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Kimberly A Kelly
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Richard Hawkins
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Mariam Bramah-Lawani
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Antonio L Amelio
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Jerome C Nwachukwu
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Kendall W Nettles
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
| | - Michael D Conkright
- Department of Cancer Biology, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
- The Center for Diabetes and Metabolic Diseases, The Scripps Research Institute, Scripps FloridaJupiter, FL, USA
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16
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Constitutive expression of Yes-associated protein (Yap) in adult skeletal muscle fibres induces muscle atrophy and myopathy. PLoS One 2013; 8:e59622. [PMID: 23544078 PMCID: PMC3609830 DOI: 10.1371/journal.pone.0059622] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 02/15/2013] [Indexed: 02/07/2023] Open
Abstract
The aim of this study was to investigate the function of the Hippo pathway member Yes-associated protein (Yap, gene name Yap1) in skeletal muscle fibres in vivo. Specifically we bred an inducible, skeletal muscle fibre-specific knock-in mouse model (MCK-tTA-hYAP1 S127A) to test whether the over expression of constitutively active Yap (hYAP1 S127A) is sufficient to drive muscle hypertrophy or stimulate changes in fibre type composition. Unexpectedly, after 5–7 weeks of constitutive hYAP1 S127A over expression, mice suddenly and rapidly lost 20–25% body weight and suffered from gait impairments and kyphosis. Skeletal muscles atrophied by 34–40% and the muscle fibre cross sectional area decreased by ≈40% when compared to control mice. Histological analysis revealed evidence of skeletal muscle degeneration and regeneration, necrotic fibres and a NADH-TR staining resembling centronuclear myopathy. In agreement with the histology, mRNA expression of markers of regenerative myogenesis (embryonic myosin heavy chain, Myf5, myogenin, Pax7) and muscle protein degradation (atrogin-1, MuRF1) were significantly elevated in muscles from transgenic mice versus control. No significant changes in fibre type composition were detected using ATPase staining. The phenotype was largely reversible, as a cessation of hYAP1 S127A expression rescued body and muscle weight, restored muscle morphology and prevented further pathological progression. To conclude, high Yap activity in muscle fibres does not induce fibre hypertrophy nor fibre type changes but instead results in a reversible atrophy and deterioration.
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17
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Araki S, Izumiya Y, Hanatani S, Rokutanda T, Usuku H, Akasaki Y, Takeo T, Nakagata N, Walsh K, Ogawa H. Akt1-mediated skeletal muscle growth attenuates cardiac dysfunction and remodeling after experimental myocardial infarction. Circ Heart Fail 2011; 5:116-25. [PMID: 22135402 DOI: 10.1161/circheartfailure.111.964783] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND It is appreciated that aerobic endurance exercise can attenuate unfavorable myocardial remodeling following myocardial infarction. In contrast, little is known about the effects of increasing skeletal muscle mass, typically achieved through resistance training, on this process. Here, we utilized transgenic (TG) mice that can induce the growth of functional skeletal muscle by switching Akt1 signaling in muscle fibers to assess the impact of glycolytic muscle growth on post-myocardial infarction cardiac remodeling. METHODS AND RESULTS Male-noninduced TG mice and their nontransgenic littermates (control) were subjected to left anterior coronary artery ligation. Two days after surgery, mice were provided doxycycline in their drinking water to activate Akt1 transgene expression in a skeletal muscle-specific manner. Myogenic Akt1 activation led to diminished left ventricular dilation and reduced contractile dysfunction compared with control mice. Improved cardiac function in Akt1 TG mice was coupled to diminished myocyte hypertrophy, decreased interstitial fibrosis, and increased capillary density. ELISA and protein array analyses demonstrated that serum levels of proangiogenic growth factors were upregulated in Akt1 TG mice compared with control mice. Cardiac eNOS was activated in Akt1 TG mice after myocardial infarction. The protective effect of skeletal muscle Akt activation on cardiac remodeling and systolic function was abolished by treatment with the eNOS inhibitor l-NAME. CONCLUSIONS Akt1-mediated skeletal muscle growth attenuates cardiac remodeling after myocardial infarction and is associated with an increased capillary density in the heart. This improvement appears to be mediated by skeletal muscle to cardiac communication, leading to activation of eNOS-signaling in the heart.
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Affiliation(s)
- Satoshi Araki
- Department of Cardiovascular Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
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18
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Zhang S, Ji Y, Liu X, Lu X, Su W, Zhang D, Hao F, Yi F, Guo L, Li X, Zheng Y. Podocyte-specific VEGF down-regulation and pathophysiological development. IUBMB Life 2011; 62:677-83. [PMID: 20827751 DOI: 10.1002/iub.368] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
It is well-known that vascular endothelial growth factor (VEGF) plays a key role in development and pathology, but its function in normal adult tissues is rarely understood. Increased use of anti-angiogenic therapies targeting VEGF in human pathologies have shown more and more adverse effects. In this report, a conditional expression model (Tet-On system) was used to down-regulate podocyte VEGF in adult mice, which resulted in many kidney problems, characterized by glomerular morphological changes, proteinuria, reduced water consumption and urination, increased urine electro-conductivity, as well as high susceptibility to BSA stress. Our findings indicated that podocyte-specific VEGF down-regulation resulted in poor kidney performance and led mice to be more susceptible to further kidney damages.
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Affiliation(s)
- Shuzhi Zhang
- National Engineering Laboratory for Druggable Gene and Protein Screening, The Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun 130024, People's Republic of China
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19
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Kim MH, Kay DI, Rudra RT, Chen BM, Hsu N, Izumiya Y, Martinez L, Spencer MJ, Walsh K, Grinnell AD, Crosbie RH. Myogenic Akt signaling attenuates muscular degeneration, promotes myofiber regeneration and improves muscle function in dystrophin-deficient mdx mice. Hum Mol Genet 2011; 20:1324-38. [PMID: 21245083 DOI: 10.1093/hmg/ddr015] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Duchenne muscular dystrophy, the most common form of childhood muscular dystrophy, is caused by X-linked inherited mutations in the dystrophin gene. Dystrophin deficiencies result in the loss of the dystrophin-glycoprotein complex at the plasma membrane, which leads to structural instability and muscle degeneration. Previously, we induced muscle-specific overexpression of Akt, a regulator of cellular metabolism and survival, in mdx mice at pre-necrotic (<3.5 weeks) ages and demonstrated upregulation of the utrophin-glycoprotein complex and protection against contractile-induced stress. Here, we found that delaying exogenous Akt treatment of mdx mice after the onset of peak pathology (>6 weeks) similarly increased the abundance of compensatory adhesion complexes at the extrasynaptic sarcolemma. Akt introduction after onset of pathology reverses the mdx histopathological measures, including decreases in blood serum albumin infiltration. Akt also improves muscle function in mdx mice as demonstrated through in vivo grip strength tests and in vitro contraction measurements of the extensor digitorum longus muscle. To further explore the significance of Akt in myofiber regeneration, we injured wild-type muscle with cardiotoxin and found that Akt induced a faster regenerative response relative to controls at equivalent time points. We demonstrate that Akt signaling pathways counteract mdx pathogenesis by enhancing endogenous compensatory mechanisms. These findings provide a rationale for investigating the therapeutic activation of the Akt pathway to counteract muscle wasting.
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Affiliation(s)
- Michelle H Kim
- Department of Integrative Biology and Physiology, David Geffen School of Medicine, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA 02118, USA
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20
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Liu X, Hao L, Zhang S, Ji Y, Zhang Y, Lu X, Shi B, Pei H, Wang Y, Chen D, Guan X, Zheng Y. Genetic repression of mouse VEGF expression regulates coagulation cascade. IUBMB Life 2010; 62:819-24. [DOI: 10.1002/iub.389] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Zou Y, Chen CH, Fike JR, Huang TT. A new mouse model for temporal- and tissue-specific control of extracellular superoxide dismutase. Genesis 2009; 47:142-54. [PMID: 19165829 DOI: 10.1002/dvg.20470] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The extracellular isoform of superoxide dismutase (EC-SOD, Sod3) plays a protective role against various diseases and injuries mediated by oxidative stress. To investigate the pathophysiological roles of EC-SOD, we generated tetracycline-inducible Sod3 transgenic mice and directed the tissue-specific expression of transgenes by crossing Sod3 transgenic mice with tissue-specific transactivator transgenics. Double transgenic mice with liver-specific expression of Sod3 showed increased EC-SOD levels predominantly in the plasma as the circulating form, whereas double transgenic mice with neuronal-specific expression expressed higher levels of EC-SOD in hippocampus and cortex with intact EC-SOD as the dominant form. EC-SOD protein levels also correlated well with increased SOD activities in double transgenic mice. In addition to enabling tissue-specific expression, the transgene expression can be quickly turned on and off by doxycycline supplementation in the mouse chow. This mouse model, thus, provides the flexibility for on-off control of transgene expression in multiple target tissues.
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Affiliation(s)
- Yani Zou
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, California, USA
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22
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Zhang H, Takayama K, Zhang L, Uchino J, Harada A, Harada T, Hisasue J, Nakagaki N, Zhou C, Nakanishi Y. Tetracycline-inducible promoter-based conditionally replicative adenoviruses for the control of viral replication. Cancer Gene Ther 2009; 16:415-22. [DOI: 10.1038/cgt.2008.101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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23
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Izumiya Y, Bina HA, Ouchi N, Akasaki Y, Kharitonenkov A, Walsh K. FGF21 is an Akt-regulated myokine. FEBS Lett 2008; 582:3805-10. [PMID: 18948104 DOI: 10.1016/j.febslet.2008.10.021] [Citation(s) in RCA: 310] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2008] [Revised: 10/08/2008] [Accepted: 10/09/2008] [Indexed: 11/30/2022]
Abstract
Fibroblast growth factor-21 (FGF21) functions as a metabolic regulator. The FGF21 transcript is reported to be abundantly expressed in liver, but little is known about the regulation of FGF21 expression in other tissues. In this study, we show that levels of FGF21 protein expression were similar in skeletal muscle and liver from fasted mice. FGF21 transcript and protein expression were upregulated in gastrocnemius muscle of skeletal muscle-specific Akt1 transgenic mice. Serum concentration of FGF21 was also increased by Akt1 transgene activation. In cultured skeletal muscle cells, FGF21 expression and secretion was regulated by insulin, Akt transduction and LY294002. These data indicate that skeletal muscle is a source of FGF21 and that its expression is regulated by a phosphatidylinosistol 3-kinase (PI3-kinase)/Akt1 signaling pathway-dependent mechanism.
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Affiliation(s)
- Yasuhiro Izumiya
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, 715 Albany Street, W611, Boston, MA 02118, United States
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24
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Hirner S, Krohne C, Schuster A, Hoffmann S, Witt S, Erber R, Sticht C, Gasch A, Labeit S, Labeit D. MuRF1-dependent regulation of systemic carbohydrate metabolism as revealed from transgenic mouse studies. J Mol Biol 2008; 379:666-77. [PMID: 18468620 DOI: 10.1016/j.jmb.2008.03.049] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 03/09/2008] [Accepted: 03/25/2008] [Indexed: 12/11/2022]
Abstract
Under various pathophysiological muscle-wasting conditions, such as diabetes and starvation, a family of ubiquitin ligases, including muscle-specific RING-finger protein 1 (MuRF1), are induced to target muscle proteins for degradation via ubiquitination. We have generated transgenic mouse lines over-expressing MuRF1 in a skeletal muscle-specific fashion (MuRF1-TG mice) in an attempt to identify the in vivo targets of MuRF1. MuRF1-TG lines were viable, had normal fertility and normal muscle weights at eight weeks of age. Comparison of quadriceps from MuRF1-TG and wild type mice did not reveal elevated multi-ubiquitination of myosin as observed in human patients with muscle wasting. Instead, MuRF1-TG mice expressed lower levels of pyruvate dehydrogenase (PDH), a mitochondrial key enzyme in charge of glycolysis, and of its regulator PDK2. Furthermore, yeast two-hybrid interaction studies demonstrated the interaction of MuRF1 with PDH, PDK2, PDK4, PKM2 (all participating in glycolysis) and with phosphorylase beta (PYGM) and glycogenin (both regulating glycogen metabolism). Consistent with the idea that MuRF1 may regulate carbohydrate metabolism, MuRF1-TG mice had twofold elevated insulin blood levels and lower hepatic glycogen contents. To further examine MuRF1's role for systemic carbohydrate regulation, we performed glucose tolerance tests (GTT) in wild type and MuRF1-TG mice. During GTT, MuRF1-TG mice developed striking hyperinsulinaemia and hepatic glycogen stores, that were depleted at basal levels, became rapidly replenished. Taken together, our data demonstrate that MuRF1 expression in skeletal muscle re-directs glycogen synthesis to the liver and stimulates pancreatic insulin secretion, thereby providing a regulatory feedback loop that connects skeletal muscle metabolism with the liver and the pancreas during metabolic stress.
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Affiliation(s)
- Stephanie Hirner
- Institute for Anaesthesiology and Intensive Operative Care, Medical Faculty Mannheim, Mannheim 68167, Germany
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25
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Izumiya Y, Hopkins T, Morris C, Sato K, Zeng L, Viereck J, Hamilton JA, Ouchi N, LeBrasseur NK, Walsh K. Fast/Glycolytic muscle fiber growth reduces fat mass and improves metabolic parameters in obese mice. Cell Metab 2008; 7:159-72. [PMID: 18249175 PMCID: PMC2828690 DOI: 10.1016/j.cmet.2007.11.003] [Citation(s) in RCA: 289] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 10/09/2007] [Accepted: 11/05/2007] [Indexed: 01/19/2023]
Abstract
In contrast to the well-established role of oxidative muscle fibers in regulating whole-body metabolism, little is known about the function of fast/glycolytic muscle fibers in these processes. Here, we generated a skeletal muscle-specific, conditional transgenic mouse expressing a constitutively active form of Akt1. Transgene activation led to muscle hypertrophy due to the growth of type IIb muscle fibers, which was accompanied by an increase in strength. Akt1 transgene induction in diet-induced obese mice led to reductions in body weight and fat mass, resolution of hepatic steatosis, and improved metabolic parameters. Akt1-mediated skeletal muscle growth opposed the effects of a high-fat/high-sucrose diet on transcript expression patterns in the liver and increased hepatic fatty acid oxidation and ketone body production. Our findings indicate that an increase in fast/glycolytic muscle mass can result in the regression of obesity and metabolic improvement through its ability to alter fatty acid oxidation in remote tissues.
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Affiliation(s)
- Yasuhiro Izumiya
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA 02118, USA
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26
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Gates AC, Bernal-Mizrachi C, Chinault SL, Feng C, Schneider JG, Coleman T, Malone JP, Townsend RR, Chakravarthy MV, Semenkovich CF. Respiratory uncoupling in skeletal muscle delays death and diminishes age-related disease. Cell Metab 2007; 6:497-505. [PMID: 18054318 DOI: 10.1016/j.cmet.2007.10.010] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2007] [Revised: 09/18/2007] [Accepted: 10/19/2007] [Indexed: 11/24/2022]
Abstract
Age-related disease, not aging per se, causes most morbidity in older humans. Here we report that skeletal muscle respiratory uncoupling due to UCP1 expression diminishes age-related disease in three mouse models. In a longevity study, median survival was increased in UCP mice (animals with skeletal muscle-specific UCP1 expression), and lymphoma was detected less frequently in UCP female mice. In apoE null mice, a vascular disease model, diet-induced atherosclerosis was decreased in UCP animals. In agouti yellow mice, a genetic obesity model, diabetes and hypertension were reversed by induction of UCP1 in skeletal muscle. Uncoupled mice had decreased adiposity, increased temperature and metabolic rate, elevated muscle SIRT and AMP kinase, and serum characterized by increased adiponectin and decreased IGF-1 and fibrinogen. Accelerating metabolism in skeletal muscle does not appear to impact aging but may delay age-related disease.
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Affiliation(s)
- Allison C Gates
- Division of Endocrinology, Metabolism and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
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27
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Hojman P, Eriksen J, Gehl J. Tet-On Induction with Doxycycline after Gene Transfer in Mice: Sweetening of Drinking Water is not a Good Idea. Anim Biotechnol 2007; 18:183-8. [PMID: 17612841 DOI: 10.1080/10495390601105055] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Gene transfer to skeletal muscle leads to long-term, stable expression of transferred genes. An exiting development is the use of inducible expression systems. Using the inducible Tet-On system, it has been customary to administer doxycycline in drinking water with added sucrose to ameliorate the bitter taste. During a study aiming at regulating electrotransferred genes through the Tet-On system, we observed excessive drinking behavior among mice. Removal of sugar from the drinking water led to normal drinking behavior and most importantly did not affect the level of gene expression. Based on this study, the practice of adding sucrose to drinking water in doxycycline induction studies should be abandoned.
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Affiliation(s)
- Pernille Hojman
- Department of Oncology, Copenhagen University Hospital at Herlev, Herlev, Denmark
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28
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Wamhoff BR, Sinha S, Owens GK. Conditional mouse models to study developmental and pathophysiological gene function in muscle. Handb Exp Pharmacol 2007:441-68. [PMID: 17203666 DOI: 10.1007/978-3-540-35109-2_18] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This chapter will review conditional mouse model systems that have been developed to study gene function in skeletal, cardiac, and vascular smooth muscle cells in vivo with an emphasis on the utility of these models for investigating developmental and pathophysiological gene function in muscle. In general, these systems have utilized muscle-specific/selective promoter-enhancers in conjunction with site-specific DNA recombinases, e.g., Cre-loxP, and fusion proteins with these recombinases that confer temporal control, such as tamoxifen-inducible CreER systems. A major focus of this chapter will be to discuss unique challenges of studying Cre-mediated mutagenesis/gene targeting in these muscle types during development and in the adult animal, some of which are inherent of the muscle cell type being studied. For example, unlike cardiac and skeletal muscle cells, the vascular SMC is extremely plastic and able to undergo rapid phenotypic modulation to various environmental cues in vivo. Thus, employing SMC marker gene promoter enhancers for conditional gene targeting in SMCs must take into account the possibility and/or certainty that the particular SMC promoter enhancers used may or may not be transcriptionally active in SMCs of a vessel wall under normal and some pathophysiological conditions. Moreover, individual floxed loci within the same muscle cell type and tissue have different degrees of sensitivity to Cre, most likely dependent on the chromatin state of that particular gene, i.e., closed/condensed state or open/active state. Thus, Cre recombination may be ineffective for specific floxed gene DNA. Lastly, rigorous efforts must be made to confirm the degree of recombination in a tissue, taking into full account the multicellularity of the tissue, to understand the extent of the physiological effect in that organ.
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Affiliation(s)
- B R Wamhoff
- Molecular Physiology and Biological Physics, The Robert M. Berne Cardiovascular Research Center, The University of Virginia, 415 Lane Road, Medical Research Building 5, Room 1226, P.O. Box 801394, Charlottesville VA 22908, USA
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29
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Uchida S, Sakai S, Furuichi T, Hosoda H, Toyota K, Ishii T, Kitamoto A, Sekine M, Koike K, Masushige S, Murphy G, Silva AJ, Kida S. Tight regulation of transgene expression by tetracycline-dependent activator and repressor in brain. GENES BRAIN AND BEHAVIOR 2006; 5:96-106. [PMID: 16436193 DOI: 10.1111/j.1601-183x.2005.00139.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Methods to temporally and spatially regulate gene mutations will provide a powerful strategy to investigate gene function in the brain. To develop these methods, we have established a tightly regulated system for transgene expression in the forebrain using both a tetracycline (Tc)-dependent transcription activator (rtTA) and a repressor (TetR-Kruppel-associated box). In this system, the repressor binds to the Tc-responsive element (TRE) in the absence of doxycycline (Dox), leading to the repression of leaky activation of TRE-mediated transcription caused by weak binding of rtTA to TRE. Upon Dox administration, only the activator binds to TRE and activates transcription. We tested this system in cultured cells by bicistronically expressing both the regulators using an internal ribosome entry site (IRES). In COS-1, HeLa and SHSY5Y cells, leaky transcription activation led by rtTA in the absence of Dox was repressed without decreasing the level of activated transcription in the presence of Dox. Using this system, transgenic mice were produced that express both the regulators using IRES in the forebrain under the control of the alphaCaMKII promoter and were bred with transgenic mice carrying the TRE-dependent reporter transgene. In reverse transcription-polymerase chain reaction and in situ hybridization analyses of the forebrain in adult double transgenic mice, the treatment of Dox induces reporter mRNA expression, which was not detected before the treatment and after the withdraw of Dox following the treatment. These results indicate that this system allows the tight regulation of transgene expression in a Dox-dependent fashion in the forebrain and will be useful in investigating gene function in the brain.
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Affiliation(s)
- S Uchida
- Department of Agricultural Chemistry, Faculty of Applied Bioscience, Tokyo University of Agriculture, Tokyo, Japan
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Cao B, Bruder J, Kovesdi I, Huard J. Muscle stem cells can act as antigen-presenting cells: implication for gene therapy. Gene Ther 2004; 11:1321-30. [PMID: 15175641 DOI: 10.1038/sj.gt.3302293] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Research has shown that the use of a muscle-specific promoter can reduce immune response and improve gene transfer to muscle fibers. We investigated the efficiency of direct and ex vivo gene transfer to the skeletal muscles of 6- to 8-week-old mdx mice by using two adenoviral vectors: adenovirus (AD) encoding the luciferase gene under the cytomegalovirus (CMV) promoter (ADCMV) and AD encoding the same gene under the muscle creatine kinase (MCK) promoter (ADMCK). Direct intramuscular injection of ADMCK triggered a lower immune response that enabled more efficient delivery and more persistent expression of the transgene than did ADCMV injection. Similarly, ex vivo gene transfer using ADCMV-transduced muscle-derived stem cells (MDSCs) induced a stronger immune response and led to shorter transgene expression than did ex vivo gene transfer using ADMCK-transduced MDSCs. This immune response was due to the release of the antigen after MDSC death or to the ADCMV-transduced MDSCs acting as antigen-presenting cells (APCs) by expressing the transgene and rapidly initiating an immune response against subsequent viral inoculation. The use of a muscle-specific promoter that restricts transgene expression to differentiated muscle cells could prevent MDSCs from becoming APCs, and thereby could improve the efficiency of ex vivo gene transfer to skeletal muscle.
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Affiliation(s)
- B Cao
- Growth and Development Laboratory, Children's Hospital of Pittsburgh and Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
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31
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Liedtke W, Simon SA. A possible role for TRPV4 receptors in asthma. Am J Physiol Lung Cell Mol Physiol 2004; 287:L269-71. [PMID: 15246981 DOI: 10.1152/ajplung.00153.2004] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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