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Takase K, Kakuta I. Oral administration of wild plant-derived minerals and red ginseng ameliorates insulin resistance in fish through different pathways. Physiol Rep 2023; 11:e15667. [PMID: 37078367 PMCID: PMC10116403 DOI: 10.14814/phy2.15667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/18/2023] [Accepted: 03/23/2023] [Indexed: 04/21/2023] Open
Abstract
Many kinds of fish are characterized by a limited efficiency to use carbohydrates. For this reason, raw fish and mixed feed containing a lot of fish meal have been used as feed for fish farming. However, continuing to use high-protein diets not only increases the cost of fish farming, but may also fuel animal protein shortages. Furthermore, carbohydrates are added to improve the texture of the feed and act as a binding agent and are usually contained at 20% in the feed. It makes sense, therefore, to find ways to make good use of carbohydrates rather than wasting them. The physiological mechanisms of glucose intolerance in fish are not yet well understood. Therefore, we investigated the glucose utilization of fish, omnivorous goldfish Carassius auratus and carnivorous rainbow trout Oncorhynchus mykiss. Furthermore, the effects of oral administration of wild plant-derived minerals and red ginseng on the glucose utilization in these fish muscle cells were investigated. As a result, we found the following. (1) An extremely high insulin resistance in fish muscle and the symptom was more pronounced in carnivorous rainbow trout. (2) Administration of wild plant-derived minerals promotes the translocation of the insulin-responsive glucose transporter GLUT4 to the cell surface of white muscle via activation of the PI3 kinase axis, whereas administration of red ginseng not only promotes GLUT4 transfer and translocation to the cell surface of white muscle via AMPK activation as well as promoting glucose uptake into muscle cells via a pathway separate from the insulin signaling system. (3) In fish, at least goldfish and rainbow trout, both PI3K/Akt and AMPK signaling cascades exist to promote glucose uptake into muscle cells, as in mammals.
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Affiliation(s)
- Kiyomi Takase
- Research Center for Creative PartnershipsIshinomaki Senshu UniversityIshinomaki986‐8580Japan
| | - Izuru Kakuta
- Faculty of Science and EngineeringIshinomaki Senshu UniverisityIshinomaki986‐8580Japan
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Inchingolo AD, Malcangi G, Inchingolo AM, Piras F, Settanni V, Garofoli G, Palmieri G, Ceci S, Patano A, De Leonardis N, Di Pede C, Montenegro V, Azzollini D, Garibaldi MG, Kruti Z, Tarullo A, Coloccia G, Mancini A, Rapone B, Semjonova A, Hazballa D, D’Oria MT, Jones M, Macchia L, Bordea IR, Scarano A, Lorusso F, Tartaglia GM, Maspero C, Del Fabbro M, Nucci L, Ferati K, Ferati AB, Brienza N, Corriero A, Inchingolo F, Dipalma G. Benefits and Implications of Resveratrol Supplementation on Microbiota Modulations: A Systematic Review of the Literature. Int J Mol Sci 2022; 23:4027. [PMID: 35409389 PMCID: PMC8999966 DOI: 10.3390/ijms23074027] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/24/2022] [Accepted: 03/31/2022] [Indexed: 01/27/2023] Open
Abstract
Resveratrol is a polyphenol that has been shown to possess many applications in different fields of medicine. This systematic review has drawn attention to the axis between resveratrol and human microbiota, which plays a key role in maintaining an adequate immune response that can lead to different diseases when compromised. Resveratrol can also be an asset in new technologies, such as gene therapy. PubMed, Cochrane Library, Scopus, Web of Science, and Google Scholar were searched to find papers that matched our topic dating from 1 January 2017 up to 18 January 2022, with English-language restriction using the following Boolean keywords: ("resveratrol" AND "microbio*"). Eighteen studies were included as relevant papers matching the purpose of our investigation. Immune response, prevention of thrombotic complications, microbiota, gene therapy, and bone regeneration were retrieved as the main topics. The analyzed studies mostly involved resveratrol supplementation and its effects on human microbiota by trials in vitro, in vivo, and ex vivo. The beneficial activity of resveratrol is evident by analyzing the changes in the host's genetic expression and the gastrointestinal microbial community with its administration. The possibility of identifying individual microbial families may allow to tailor therapeutic plans with targeted polyphenolic diets when associated with microbial dysbiosis, such as inflammatory diseases of the gastrointestinal tract, degenerative diseases, tumors, obesity, diabetes, bone tissue regeneration, and metabolic syndrome.
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Affiliation(s)
- Alessio Danilo Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Giuseppina Malcangi
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Angelo Michele Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Fabio Piras
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Vito Settanni
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Grazia Garofoli
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Giulia Palmieri
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Sabino Ceci
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Assunta Patano
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Nicole De Leonardis
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Chiara Di Pede
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Valentina Montenegro
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Daniela Azzollini
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Maria Grazia Garibaldi
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Zamira Kruti
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Antonella Tarullo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Giovanni Coloccia
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Antonio Mancini
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Biagio Rapone
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Alexandra Semjonova
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Denisa Hazballa
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
- Kongresi Elbasanit, Aqif Pasha, Rruga, 3001 Elbasan, Albania
| | - Maria Teresa D’Oria
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
- Department of Medical and Biological Sciences, University of Udine, Via delle Scienze, 206, 33100 Udine, Italy
| | - Megan Jones
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Luigi Macchia
- Department of Emergency and Organ Transplantation (D.E.T.O.), University of Bari “Aldo Moro”, 70121 Bari, Italy;
| | - Ioana Roxana Bordea
- Department of Oral Rehabilitation, Faculty of Dentistry, Iuliu Hațieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Antonio Scarano
- Department of Innovative Technologies in Medicine and Dentistry, University of Chieti-Pescara, 66100 Chieti, Italy;
| | - Felice Lorusso
- Department of Innovative Technologies in Medicine and Dentistry, University of Chieti-Pescara, 66100 Chieti, Italy;
| | - Gianluca Martino Tartaglia
- Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, University of Milan, 20122 Milan, Italy; (G.M.T.); (C.M.); (M.D.F.)
- UOC Maxillo-Facial Surgery and Dentistry, Fondazione IRCCS Ca Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Cinzia Maspero
- Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, University of Milan, 20122 Milan, Italy; (G.M.T.); (C.M.); (M.D.F.)
- UOC Maxillo-Facial Surgery and Dentistry, Fondazione IRCCS Ca Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Massimo Del Fabbro
- Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, University of Milan, 20122 Milan, Italy; (G.M.T.); (C.M.); (M.D.F.)
- IRCCS Orthopedic Institute Galeazzi, 20161 Milan, Italy
| | - Ludovica Nucci
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli, Via Luigi de Crecchio, 6, 80138 Naples, Italy;
| | - Kenan Ferati
- Faculty of Medical Sciences, University of Tetovo, 1220 Tetovo, North Macedonia; (K.F.); (A.B.F.)
| | - Arberesha Bexheti Ferati
- Faculty of Medical Sciences, University of Tetovo, 1220 Tetovo, North Macedonia; (K.F.); (A.B.F.)
| | - Nicola Brienza
- Unit of Anesthesia and Resuscitation, Department of Emergencies and Organ Transplantations, Aldo Moro University, 70124 Bari, Italy; (N.B.); (A.C.)
| | - Alberto Corriero
- Unit of Anesthesia and Resuscitation, Department of Emergencies and Organ Transplantations, Aldo Moro University, 70124 Bari, Italy; (N.B.); (A.C.)
| | - Francesco Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
| | - Gianna Dipalma
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.D.I.); (G.M.); (A.M.I.); (F.P.); (V.S.); (G.G.); (G.P.); (S.C.); (A.P.); (N.D.L.); (C.D.P.); (V.M.); (D.A.); (M.G.G.); (Z.K.); (A.T.); (G.C.); (A.M.); (B.R.); (A.S.); (D.H.); (M.T.D.); (M.J.); (F.I.); (G.D.)
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Heckmann M, Klanert G, Sandner G, Lanzerstorfer P, Auer M, Weghuber J. Fluorescence Microscopy-Based Quantitation of GLUT4 Translocation. Methods Appl Fluoresc 2022; 10. [PMID: 35008072 DOI: 10.1088/2050-6120/ac4998] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 01/10/2022] [Indexed: 11/11/2022]
Abstract
Postprandial insulin-stimulated glucose uptake into target tissue is crucial for the maintenance of normal blood glucose homeostasis. This step is rate-limited by the number of facilitative glucose transporters type 4 (GLUT4) present in the plasma membrane. Since insulin resistance and impaired GLUT4 translocation are associated with the development of metabolic disorders such as type 2 diabetes, this transporter has become an important target of antidiabetic drug research. The application of screening approaches that are based on the analysis of GLUT4 translocation to the plasma membrane to identify substances with insulinomimetic properties has gained global research interest in recent years. Here, we review methods that have been implemented to quantitate the translocation of GLUT4 to the plasma membrane. These methods can be broadly divided into two sections: microscopy-based technologies (e.g., immunoelectron, confocal or total internal reflection fluorescence microscopy) and biochemical and spectrometric approaches (e.g., membrane fractionation, photoaffinity labeling or flow cytometry). In this review, we discuss the most relevant approaches applied to GLUT4 thus far, highlighting the advantages and disadvantages of these approaches, and we provide a critical discussion and outlook into new methodological opportunities.
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Affiliation(s)
- Mara Heckmann
- University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, Wels, Oberösterreich, 4600, AUSTRIA
| | - Gerald Klanert
- FFoQSI GmbH-Austrian Competence Centre for Feed and Food Quality, Safety and Innovation, Technopark 1C, Tulln, 3430, AUSTRIA
| | - Georg Sandner
- University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, Wels, Oberösterreich, 4600, AUSTRIA
| | - Peter Lanzerstorfer
- University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, Wels, Oberösterreich, 4600, AUSTRIA
| | - Manfred Auer
- Division of Pathway Medicine, University of Edinburgh, University of Edinburgh Medical School, The Chancellor's Building, 49 Little France Crescent, Edinburgh, EH16 4SB, Edinburgh, EH8 9AB, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Julian Weghuber
- University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, Wels, Oberösterreich, 4600, AUSTRIA
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Effects of Physiological Doses of Resveratrol and Quercetin on Glucose Metabolism in Primary Myotubes. Int J Mol Sci 2021; 22:ijms22031384. [PMID: 33573178 PMCID: PMC7866515 DOI: 10.3390/ijms22031384] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 02/07/2023] Open
Abstract
Phenolic compounds have emerged in recent years as an option to face insulin resistance and diabetes. The central aim of this study was: (1) to demonstrate that physiological doses of resveratrol (RSV) or quercetin (Q) can influence glucose metabolism in human myotubes, (2) to establish whether AMP-activated protein kinase (AMPK) and protein kinase B -PKB- (Akt) pathways are involved in this effect. In addition, the effects of these polyphenols on mitochondrial biogenesis and fatty acid oxidation were analysed. Myotubes from healthy donors were cultured for 24 h with either 0.1 μM of RSV or with 10 μM of Q. Glucose metabolism, such as glycogen synthesis, glucose oxidation, and lactate production, were measured with D[U-14C]glucose. β-oxidation using [1-14C]palmitate as well as the expression of key metabolic genes and proteins by Real Time PCR and Western blot were also assessed. Although RSV and Q increased pgc1α expression, they did not significantly change either glucose oxidation or β-oxidation. Q increased AMPK, insulin receptor substrate 1 (IRS-1), and AS160 phosphorylation in basal conditions and glycogen synthase kinase 3 (GSK3β) in insulin-stimulated conditions. RSV tended to increase the phosphorylation rates of AMPK and GSK3β. Both of the polyphenols increased insulin-stimulated glycogen synthesis and reduced lactate production in human myotubes. Thus, physiological doses of RSV or Q may exhibit anti-diabetic actions in human myotubes.
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Liu Y, Zhang D, Yuan J, Song L, Zhang C, Lin Q, Li M, Sheng Z, Ma Z, Lv F, Gao G, Dong J. Hyperbaric Oxygen Ameliorates Insulin Sensitivity by Increasing GLUT4 Expression in Skeletal Muscle and Stimulating UCP1 in Brown Adipose Tissue in T2DM Mice. Front Endocrinol (Lausanne) 2020; 11:32. [PMID: 32082261 PMCID: PMC7005601 DOI: 10.3389/fendo.2020.00032] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 01/15/2020] [Indexed: 12/21/2022] Open
Abstract
Hyperbaric oxygen (HBO) therapy is a treatment modality useful for diseases. Hypoxia could stimulate the induction of insulin resistance. Therefore, we sought to determine whether hyperbaric oxygen would ameliorate insulin sensitivity by promoting glucose transporter type 4 (GLUT4) expression in muscle and by stimulating UCP1 in brown adipose tissue (BAT) in a streptozocin (STZ)-induced type 2 diabetes mellitus (T2DM) mouse model. Male C57BL/6J mice were treated three times with low-dose of streptozocin (60 mg/kg, i.p.) and were fed with high-fat diets (HFD) to establish the T2DM model. HBO was administered daily as 100% oxygen at 2.0 atmosphere absolute (ATA) for 1 h for a week. We found that HBO significantly reduced blood glucose levels and attenuated insulin resistance in T2DM mice. HBO modulated food intake by influencing the activity of neuropeptide Y (NPY)-positive neurons in the arcuate nucleus (Arc). HBO treatment increased GLUT4 amount and level of phosphorylated Akt (p-Akt) in muscles of T2DM mice whereas this treatment stimulated the phosphorylation of AMPK in muscles of both T2DM and HFD mice. The morphological staining of BAT and the increased expression of uncoupling of protein 1 (UCP1) demonstrated the promotion of metabolism after HBO treatment. These findings suggest that HBO ameliorates insulin sensitivity of T2DM mice by stimulating the Akt signaling pathway and by promoting GLUT4 expression in muscle, and by increasing UCP1 expression in BAT.
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Affiliation(s)
- Yuan Liu
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Di Zhang
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Junhua Yuan
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Limin Song
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Caishun Zhang
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Qian Lin
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Manwen Li
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Zhi Sheng
- Medical College, Qingdao University, Qingdao, China
| | - Zhengye Ma
- Medical College, Qingdao University, Qingdao, China
| | - Fengyuan Lv
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
| | - Guangkai Gao
- Department of Hyperbaric Medicine, No. 971 Hospital of Chinese People's Liberation Army, Qingdao, China
| | - Jing Dong
- Department of Special Medicine, Basic Medical College, Qingdao University, Qingdao, China
- Department of Physiology, Medical College, Qingdao University, Qingdao, China
- *Correspondence: Jing Dong
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6
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Pataky MW, Yu CS, Nie Y, Arias EB, Singh M, Mendias CL, Ploutz-Snyder RJ, Cartee GD. Skeletal muscle fiber type-selective effects of acute exercise on insulin-stimulated glucose uptake in insulin-resistant, high-fat-fed rats. Am J Physiol Endocrinol Metab 2019; 316:E695-E706. [PMID: 30753114 PMCID: PMC6580167 DOI: 10.1152/ajpendo.00482.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Insulin-stimulated glucose uptake (GU) by skeletal muscle is enhanced several hours after acute exercise in rats with normal or reduced insulin sensitivity. Skeletal muscle is composed of multiple fiber types, but exercise's effect on fiber type-specific insulin-stimulated GU in insulin-resistant muscle was previously unknown. Male rats were fed a high-fat diet (HFD; 2 wk) and were either sedentary (SED) or exercised (2-h exercise). Other, low-fat diet-fed (LFD) rats remained SED. Rats were studied immediately postexercise (IPEX) or 3 h postexercise (3hPEX). Epitrochlearis muscles from IPEX rats were incubated in 2-deoxy-[3H]glucose (2-[3H]DG) without insulin. Epitrochlearis muscles from 3hPEX rats were incubated with 2-[3H]DG ± 100 µU/ml insulin. After single fiber isolation, GU and fiber type were determined. Glycogen and lipid droplets (LDs) were assessed histochemically. GLUT4 abundance was determined by immunoblotting. In HFD-SED vs. LFD-SED rats, insulin-stimulated GU was decreased in type IIB, IIX, IIAX, and IIBX fibers. Insulin-independent GU IPEX was increased and glycogen content was decreased in all fiber types (types I, IIA, IIB, IIX, IIAX, and IIBX). Exercise by HFD-fed rats enhanced insulin-stimulated GU in all fiber types except type I. Single fiber analyses enabled discovery of striking fiber type-specific differences in HFD and exercise effects on insulin-stimulated GU. The fiber type-specific differences in insulin-stimulated GU postexercise in insulin-resistant muscle were not attributable to a lack of fiber recruitment, as indirectly evidenced by insulin-independent GU and glycogen IPEX, differences in multiple LD indexes, or altered GLUT4 abundance, implicating fiber type-selective differences in the cellular processes responsible for postexercise enhancement of insulin-mediated GLUT4 translocation.
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MESH Headings
- Animals
- Diet, High-Fat
- Glucose/metabolism
- Glucose Transporter Type 4/metabolism
- Glycogen/metabolism
- Insulin/pharmacology
- Insulin Resistance
- Lipid Droplets/metabolism
- Male
- Muscle Fibers, Fast-Twitch/drug effects
- Muscle Fibers, Fast-Twitch/metabolism
- Muscle Fibers, Skeletal/drug effects
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Slow-Twitch/drug effects
- Muscle Fibers, Slow-Twitch/metabolism
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/metabolism
- Physical Conditioning, Animal
- Rats
- Rats, Wistar
- Sedentary Behavior
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Affiliation(s)
- Mark W Pataky
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Carmen S Yu
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Yilin Nie
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Edward B Arias
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Manak Singh
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Christopher L Mendias
- Hospital for Special Surgery and Department of Physiology and Biophysics, Weill Cornell Medical College , New York, New York
| | | | - Gregory D Cartee
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
- Department of Molecular and Integrative Physiology, University of Michigan , Ann Arbor, Michigan
- Institute of Gerontology, University of Michigan , Ann Arbor, Michigan
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7
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Knudsen JR, Henriquez-Olguin C, Li Z, Jensen TE. Electroporated GLUT4-7myc-GFP detects in vivo glucose transporter 4 translocation in skeletal muscle without discernible changes in GFP patterns. Exp Physiol 2019; 104:704-714. [PMID: 30710396 DOI: 10.1113/ep087545] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 02/01/2019] [Indexed: 12/22/2022]
Abstract
NEW FINDINGS What is the central question of this study? Resolving the mechanism(s) leading to glucose transporter 4 (GLUT4) translocation to the muscle surface membrane has great therapeutic potential. However, the measurement of GLUT4 translocation is technically challenging. Here, we asked whether electroporation of GLUT4-7myc-GFP into skeletal muscle could be used as a tool to study GLUT4 translocation in vivo. What is the main finding and its importance? By acutely inducing GLUT4-7myc-GFP expression in skeletal muscle, we verified that in vivo exercise and AICAR stimulation increased the GLUT4 presence in the sarcolemma measured as myc signal. Importantly, the increased myc signal in the sarcolemma was not accompanied by major visual changes in the distribution of the GFP signal. ABSTRACT Insulin and exercise lead to translocation of the glucose transporter 4 (GLUT4) to the surface membrane of skeletal muscle fibres. This process is pivotal for facilitating glucose uptake into skeletal muscle. To study this, a robust assay is needed to measure the translocation of GLUT4 in adult skeletal muscle directly. Here, we aimed to validate a simple GLUT4 translocation assay using a genetically encoded biosensor in mouse skeletal muscle. We transfected GLUT4-7myc-GFP into mouse muscle to study live GLUT4 movement and to evaluate GLUT4 insertion in the muscle surface membrane after in vivo running exercise and pharmacological activation of AMP-activated protein kinase (AMPK). Transfection led to expression of GLUT4-7myc-GFP that was dynamic in live flexor digitorum brevis fibres and which, upon insulin stimulation, exposed the myc epitope extracellularly. Running exercise, in addition to AMPK activation by 5-aminoimidazole-4-carboxamide ribonucleotide, induced ∼125 and ∼100% increase, respectively, in extracellularly exposure of GLUT4 in the surface membrane of tibialis anterior muscle. Interestingly, the clear increase in surface-exposed GLUT4 content induced by insulin, exercise or AMPK activation was not accompanied by any discernible reorganization of the GLUT4-GFP signal. In conclusion, we provide a detailed description of an easy-to-use translocation assay to study GLUT4 accumulation at the surface membrane induced by exercise and exercise-mimicking stimuli. Notably, our analyses revealed that increased GLUT4 surface membrane accumulation was not accompanied by a discernible change in the GLUT4 localization pattern.
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Affiliation(s)
- Jonas Roland Knudsen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Carlos Henriquez-Olguin
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Zhencheng Li
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Elbenhardt Jensen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
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8
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Huang W, Zeng J, Liu Z, Su M, Li Q, Zhu B. Acetylshikonin stimulates glucose uptake in L6 myotubes via a PLC-β3/PKCδ-dependent pathway. Biomed Pharmacother 2019; 112:108588. [PMID: 30780104 DOI: 10.1016/j.biopha.2019.01.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 01/10/2019] [Accepted: 01/16/2019] [Indexed: 10/27/2022] Open
Abstract
Acetylshikonin, a naphthoquinone derivative derived from Lithospermum erythrorhizon, has been shown to have various pharmacological activities; however, its effect on diabetes has rarely been reported. We investigated the hypoglycemic effect of acetylshikonin and found that it decreased blood glucose to a greater extent than insulin and improved glucose tolerance in mice. It also increased glucose uptake in L6 myotubes by inducing the expression and translocation of glucose transporter 4 via decomposition of phosphatidylinositol, increased generation of diacylglycerol, and activation of protein kinase C delta cascades; this is an insulin-, reactive oxygen species-, and AMP-activated protein kinase-independent pathway for glucose uptake. Our findings highlight the antidiabetic potential of acetylshikonin via a possible novel pathway for glucose uptake in L6 myotubes.
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Affiliation(s)
- Wendong Huang
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China; Department of Pharmacy, Maoming People's Hospital, Maoming, China
| | - Jiacheng Zeng
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Zhaochun Liu
- Department of Pharmacy, Guangzhou Red Cross Hospital, Medical College, Jinan University, Guangzhou, China
| | - Meiling Su
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Qisen Li
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Banghao Zhu
- Department of Pharmacology, Cardiac and Cerebral Vascular Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China.
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9
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Houghton MJ, Kerimi A, Mouly V, Tumova S, Williamson G. Gut microbiome catabolites as novel modulators of muscle cell glucose metabolism. FASEB J 2018; 33:1887-1898. [PMID: 30183376 DOI: 10.1096/fj.201801209r] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The gut microbiome supplies essential metabolites such as short-chain fatty acids to skeletal muscle mitochondria, and the composition and activity of the microbiota is in turn affected by muscle fitness. To further our understanding of the complex interactions between the gut microbiome and muscle, we examined the effect of microbiota-derived phenolic metabolites on the ability of human muscle cells to take up and metabolize glucose. As a model, we used the differentiated human skeletal muscle myoblast line, LHCN-M2, which expresses typical muscle phenotypic markers. We initially tested a selected panel of parent phenolic compounds and microbial metabolites, and their respective phenolic conjugates, as found in blood. Several of the tested compounds increased glucose uptake and metabolism, notably in high glucose- and insulin-treated myotubes. One of the most effective was isovanillic acid 3 -O-sulfate (IVAS), a metabolite from the microbiome found in the blood, primarily derived from consumed cyanidin 3 -O-glucoside, a major compound in berry fruits. IVAS stimulated a dose-dependent increase in glucose transport through glucose transporter GLUT4- and PI3K-dependent mechanisms. IVAS also up-regulated GLUT1, GLUT4, and PI3K p85α protein, and increased phosphorylation of Akt. The stimulation of glucose uptake and metabolism by a unique microbiome metabolite provides a novel link among diet, gut microbiota, and skeletal muscle energy source utilization.-Houghton, M. J., Kerimi, A., Mouly, V., Tumova, S., Williamson, G. Gut microbiome catabolites as novel modulators of muscle cell glucose metabolism.
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Affiliation(s)
- Michael J Houghton
- School of Food Science and Nutrition, Faculty of Maths and Physical Sciences, University of Leeds, Leeds, United Kingdom
| | - Asimina Kerimi
- School of Food Science and Nutrition, Faculty of Maths and Physical Sciences, University of Leeds, Leeds, United Kingdom
| | - Vincent Mouly
- Sorbonne Université, INSERM, Institute of Myology, Centre of Research in Myology, Unite Mixte de Recherche Scientifique 974, Paris, France
| | - Sarka Tumova
- School of Food Science and Nutrition, Faculty of Maths and Physical Sciences, University of Leeds, Leeds, United Kingdom
| | - Gary Williamson
- School of Food Science and Nutrition, Faculty of Maths and Physical Sciences, University of Leeds, Leeds, United Kingdom
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10
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Plöckinger U, Prasad V, Ziagaki A, Tiling N, Poellinger A. 2-deoxy-2-[18]fluoro-D-glucose PET/CT (18FDG PET/CT) may not be a viable biomarker in Pompe disease. Hum Genomics 2018. [PMID: 29523196 PMCID: PMC5845361 DOI: 10.1186/s40246-018-0145-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Background Pompe disease (PD) is an autosomal recessive, lysosomal storage disease due to a mutation of the acid α-glucosidase (GAA) gene. In adult patients, PD is characterized by slowly progressive limb-girdle and trunk myopathy and restrictive respiratory insufficiency. Enzyme replacement therapy (ERT) is available, improving or stabilizing muscle-function in some and slowing deterioration in other patients. Unfortunately, there is no biomarker available to indicate therapeutic efficacy and/or disease activity. Whole body MRI depicts all skeletal muscles demonstrating foci of atrophic muscles, i.e., late and irreversible pathological changes. Any method indicating the localizations of increased muscle glycogen storage, muscle inflammation and/or degradation could possibly help identifying newly afflicted tissue and may be of prognostic value. We therefore investigated 2-deoxy-2-[18]fluoro-D-glucose (FDG) PET, a biomarker for glucose-metabolism, as a tool to evaluate disease activity and prognosis in PD. Methods In a pilot study, we investigated four patients by FDG dynamic PET/CT while on ERT. One patient had FDG-PET/CT twice, before and after 12 months on ERT. Dynamic FDG-PET/CT quantifies the metabolic rate of glucose utilisation in mg/ml/min. MRI was performed in parallel with pelvic and thigh muscles semi-quantitatively scored for atrophy and disease-activity. Results None of the muscles analysed showed a focally increased FDG-uptake. Thus, quantification of muscle glucose metabolism could not be calculated. However, increased FDG-uptake, i.e., increased glucose utilisation, was observed in the respiratory muscles of one patient with severe, restrictive respiratory failure. In contrast, specific MRI sequences showed oedematous as well as atrophic muscle areas in PD. Conclusions Our pilot study demonstrates that FDG-uptake does not correlate with glycogen storage in vivo. In contrast, MRI is an excellent tool to demonstrate the extent of muscle involvement. Specific MRI sequences may even demonstrate early changes possibly allowing prognostic predictions or localization of early stages of PD.
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Affiliation(s)
- U Plöckinger
- Kompetenzzentrum Seltene Stoffwechselkrankheiten, Interdisziplinäres Stoffwechsel-Centrum: Endokrinologie, Diabetes und Stoffwechsel, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, Campus Virchow-Klinikum, 13352, Berlin, Germany.
| | - V Prasad
- Department of Nuclear Medicine, Charité Universitätsmedizin Berlin, Berlin, Germany.,Department of Nuclear Medicine Universitätsklinik Ulm, Ulm, Germany
| | - A Ziagaki
- Kompetenzzentrum Seltene Stoffwechselkrankheiten, Interdisziplinäres Stoffwechsel-Centrum: Endokrinologie, Diabetes und Stoffwechsel, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, Campus Virchow-Klinikum, 13352, Berlin, Germany
| | - N Tiling
- Kompetenzzentrum Seltene Stoffwechselkrankheiten, Interdisziplinäres Stoffwechsel-Centrum: Endokrinologie, Diabetes und Stoffwechsel, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, Campus Virchow-Klinikum, 13352, Berlin, Germany
| | - A Poellinger
- Department of Diagnostic, Interventional and Pediatric Radiology, Inselspital Bern University Hospital, University of Bern, Bern, Switzerland
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11
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Pataky MW, Wang H, Yu CS, Arias EB, Ploutz-Snyder RJ, Zheng X, Cartee GD. High-Fat Diet-Induced Insulin Resistance in Single Skeletal Muscle Fibers is Fiber Type Selective. Sci Rep 2017; 7:13642. [PMID: 29057943 PMCID: PMC5651812 DOI: 10.1038/s41598-017-12682-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 09/18/2017] [Indexed: 11/17/2022] Open
Abstract
Skeletal muscle is the major site for insulin-stimulated glucose disposal, and muscle insulin resistance confers many negative health outcomes. Muscle is composed of multiple fiber types, and conventional analysis of whole muscles cannot elucidate fiber type differences at the cellular level. Previous research demonstrated that a brief (two weeks) high fat diet (HFD) caused insulin resistance in rat skeletal muscle. The primary aim of this study was to determine in rat skeletal muscle the influence of a brief (two weeks) HFD on glucose uptake (GU) ± insulin in single fibers that were also characterized for fiber type. Epitrochlearis muscles were incubated with [3H]-2-deoxyglucose (2DG) ± 100 µU/ml insulin. Fiber type (myosin heavy chain expression) and 2DG accumulation were measured in whole muscles and single fibers. Although fiber type composition of whole muscles did not differ between diet groups, GU of insulin-stimulated whole muscles from LFD rats significantly exceeded HFD values (P < 0.005). For HFD versus LFD rats, GU of insulin-stimulated single fibers was significantly (P < 0.05) lower for IIA, IIAX, IIBX, IIB, and approached significance for IIX (P = 0.100), but not type I (P = 0.776) fibers. These results revealed HFD-induced insulin resistance was attributable to fiber type selective insulin resistance and independent of altered fiber type composition.
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Affiliation(s)
- Mark W Pataky
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, MI, USA
| | - Haiyan Wang
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, MI, USA
| | - Carmen S Yu
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, MI, USA
| | - Edward B Arias
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, MI, USA
| | | | - Xiaohua Zheng
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, MI, USA
| | - Gregory D Cartee
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, MI, USA. .,Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA. .,Institute of Gerontology, University of Michigan, Ann Arbor, MI, USA.
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12
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Adeva-Andany MM, González-Lucán M, Donapetry-García C, Fernández-Fernández C, Ameneiros-Rodríguez E. Glycogen metabolism in humans. BBA CLINICAL 2016; 5:85-100. [PMID: 27051594 PMCID: PMC4802397 DOI: 10.1016/j.bbacli.2016.02.001] [Citation(s) in RCA: 264] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 02/10/2016] [Accepted: 02/16/2016] [Indexed: 12/31/2022]
Abstract
In the human body, glycogen is a branched polymer of glucose stored mainly in the liver and the skeletal muscle that supplies glucose to the blood stream during fasting periods and to the muscle cells during muscle contraction. Glycogen has been identified in other tissues such as brain, heart, kidney, adipose tissue, and erythrocytes, but glycogen function in these tissues is mostly unknown. Glycogen synthesis requires a series of reactions that include glucose entrance into the cell through transporters, phosphorylation of glucose to glucose 6-phosphate, isomerization to glucose 1-phosphate, and formation of uridine 5'-diphosphate-glucose, which is the direct glucose donor for glycogen synthesis. Glycogenin catalyzes the formation of a short glucose polymer that is extended by the action of glycogen synthase. Glycogen branching enzyme introduces branch points in the glycogen particle at even intervals. Laforin and malin are proteins involved in glycogen assembly but their specific function remains elusive in humans. Glycogen is accumulated in the liver primarily during the postprandial period and in the skeletal muscle predominantly after exercise. In the cytosol, glycogen breakdown or glycogenolysis is carried out by two enzymes, glycogen phosphorylase which releases glucose 1-phosphate from the linear chains of glycogen, and glycogen debranching enzyme which untangles the branch points. In the lysosomes, glycogen degradation is catalyzed by α-glucosidase. The glucose 6-phosphatase system catalyzes the dephosphorylation of glucose 6-phosphate to glucose, a necessary step for free glucose to leave the cell. Mutations in the genes encoding the enzymes involved in glycogen metabolism cause glycogen storage diseases.
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Affiliation(s)
- María M. Adeva-Andany
- Nephrology Division, Hospital General Juan Cardona, c/ Pardo Bazán s/n, 15406 Ferrol, Spain
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13
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Aegeline from Aegle marmelos stimulates glucose transport via Akt and Rac1 signaling, and contributes to a cytoskeletal rearrangement through PI3K/Rac1. Eur J Pharmacol 2015; 762:419-29. [PMID: 26102565 DOI: 10.1016/j.ejphar.2015.05.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 05/10/2015] [Accepted: 05/14/2015] [Indexed: 11/21/2022]
Abstract
Aegeline is an alkaloidal-amide, isolated from the leaves of Aegle marmelos and have shown antihyperglycemic as well as antidyslipidemic activities in the validated animal models of type 2 diabetes mellitus. Here we delineate, aegeline enhanced GLUT4 translocation mediated 2-deoxy-glucose uptake in both time and concentration-dependent manner. 2-deoxy-glucose uptake was completely stymied by the transport inhibitors (wortmannin and genistein) in C2C12 myotubes. Pharmacological inhibition of Akt (also known as protein kinase B) and Ras-related C3 botulinum toxin substrate 1 (Rac1) suggest that both Akt and Rac1 operate aegeline-stimulated glucose transport via distinct parallel pathways. Moreover, aegeline activates p21 protein-activated kinase 1 (PAK1) and cofilin (an actin polymerization regulator). Rac1 inhibitor (Rac1 inhib II) and PAK1 inhibitor (IPA-3) completely blocked aegeline-induced phosphorylation of cofilin and p21 protein-activated kinase 1 (PAK1). In summary, these findings suggest that aegeline stimulates the glucose transport through Akt and Rac1 dependent distinct parallel pathways and have cytoskeletal roles via stimulation of the PI3-kinase-Rac1-PAK1-cofilin pathway in the skeletal muscle cells. Therefore, multiple targets of aegeline in the improvement of insulin sensitivity of the skeletal muscle cells may be suggested.
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14
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O'Neill BT, Lauritzen HPMM, Hirshman MF, Smyth G, Goodyear LJ, Kahn CR. Differential Role of Insulin/IGF-1 Receptor Signaling in Muscle Growth and Glucose Homeostasis. Cell Rep 2015; 11:1220-35. [PMID: 25981038 DOI: 10.1016/j.celrep.2015.04.037] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 03/11/2015] [Accepted: 04/17/2015] [Indexed: 11/29/2022] Open
Abstract
Insulin and insulin-like growth factor 1 (IGF-1) are major regulators of muscle protein and glucose homeostasis. To determine how these pathways interact, we generated mice with muscle-specific knockout of IGF-1 receptor (IGF1R) and insulin receptor (IR). These MIGIRKO mice showed >60% decrease in muscle mass. Despite a complete lack of insulin/IGF-1 signaling in muscle, MIGIRKO mice displayed normal glucose and insulin tolerance. Indeed, MIGIRKO mice showed fasting hypoglycemia and increased basal glucose uptake. This was secondary to decreased TBC1D1 resulting in increased Glut4 and Glut1 membrane localization. Interestingly, overexpression of a dominant-negative IGF1R in muscle induced glucose intolerance in MIGIRKO animals. Thus, loss of insulin/IGF-1 signaling impairs muscle growth, but not whole-body glucose tolerance due to increased membrane localization of glucose transporters. Nonetheless, presence of a dominant-negative receptor, even in the absence of functional IR/IGF1R, induces glucose intolerance, indicating that interactions between these receptors and other proteins in muscle can impair glucose homeostasis.
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Affiliation(s)
- Brian T O'Neill
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Hans P M M Lauritzen
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Michael F Hirshman
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Graham Smyth
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Laurie J Goodyear
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - C Ronald Kahn
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA.
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15
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Sylow L, Kleinert M, Pehmøller C, Prats C, Chiu TT, Klip A, Richter EA, Jensen TE. Akt and Rac1 signaling are jointly required for insulin-stimulated glucose uptake in skeletal muscle and downregulated in insulin resistance. Cell Signal 2014; 26:323-31. [DOI: 10.1016/j.cellsig.2013.11.007] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 11/01/2013] [Indexed: 11/16/2022]
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Insulin- and contraction-induced glucose transporter 4 traffic in muscle: insights from a novel imaging approach. Exerc Sport Sci Rev 2014; 41:77-86. [PMID: 23072821 DOI: 10.1097/jes.0b013e318275574c] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Insulin- and contraction-mediated glucose transporter 4 (GLUT4) trafficking have different kinetics in mature skeletal muscle. Intravital imaging indicates that insulin-stimulated GLUT4 trafficking differs between t-tubules and sarcolemma. In contrast, contraction-induced GLUT4 trafficking does not differ between membrane surfaces. This distinction likely is caused by differences in the underlying signaling pathways regulating GLUT4 vesicle depletion, GLUT4 membrane fusion, and GLUT4 reinternalization.
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17
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Mechanisms regulating GLUT4 transcription in skeletal muscle cells are highly conserved across vertebrates. PLoS One 2013; 8:e80628. [PMID: 24260440 PMCID: PMC3832493 DOI: 10.1371/journal.pone.0080628] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/03/2013] [Indexed: 12/30/2022] Open
Abstract
The glucose transporter 4 (GLUT4) plays a key role in glucose uptake in insulin target tissues. This transporter has been extensively studied in many species in terms of its function, expression and cellular traffic and complex mechanisms are involved in its regulation at many different levels. However, studies investigating the transcription of the GLUT4 gene and its regulation are scarce. In this study, we have identified the GLUT4 gene in a teleost fish, the Fugu (Takifugu rubripes), and have cloned and characterized a functional promoter of this gene for the first time in a non-mammalian vertebrate. In silico analysis of the Fugu GLUT4 promoter identified potential binding sites for transcription factors such as SP1, C/EBP, MEF2, KLF, SREBP-1c and GC-boxes, as well as a CpG island, but failed to identify a TATA box. In vitro analysis revealed three transcription start sites, with the main residing 307 bp upstream of the ATG codon. Deletion analysis determined that the core promoter was located between nucleotides -132/+94. By transfecting a variety of 5´deletion constructs into L6 muscle cells we have determined that Fugu GLUT4 promoter transcription is regulated by insulin, PG-J2, a PPARγ agonist, and electrical pulse stimulation. Furthermore, our results suggest the implication of motifs such as PPARγ/RXR and HIF-1α in the regulation of Fugu GLUT4 promoter activity by PPARγ and contractile activity, respectively. These data suggest that the characteristics and regulation of the GLUT4 promoter have been remarkably conserved during the evolution from fish to mammals, further evidencing the important role of GLUT4 in metabolic regulation in vertebrates.
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18
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Lauritzen HP, Brandauer J, Schjerling P, Koh HJ, Treebak JT, Hirshman MF, Galbo H, Goodyear LJ. Contraction and AICAR stimulate IL-6 vesicle depletion from skeletal muscle fibers in vivo. Diabetes 2013; 62:3081-92. [PMID: 23761105 PMCID: PMC3749330 DOI: 10.2337/db12-1261] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Recent studies suggest that interleukin 6 (IL-6) is released from contracting skeletal muscles; however, the cellular origin, secretion kinetics, and signaling mechanisms regulating IL-6 secretion are unknown. To address these questions, we developed imaging methodology to study IL-6 in fixed mouse muscle fibers and in live animals in vivo. Using confocal imaging to visualize endogenous IL-6 protein in fixed muscle fibers, we found IL-6 in small vesicle structures distributed throughout the fibers under basal (resting) conditions. To determine the kinetics of IL-6 secretion, intact quadriceps muscles were transfected with enhanced green fluorescent protein (EGFP)-tagged IL-6 (IL-6-EGFP), and 5 days later anesthetized mice were imaged before and after muscle contractions in situ. Contractions decreased IL-6-EGFP-containing vesicles and protein by 62% (P < 0.05), occurring rapidly and progressively over 25 min of contraction. However, contraction-mediated IL-6-EGFP reduction was normal in muscle-specific AMP-activated protein kinase (AMPK) α2-inactive transgenic mice. In contrast, the AMPK activator AICAR decreased IL-6-EGFP vesicles, an effect that was inhibited in the transgenic mice. In conclusion, resting skeletal muscles contain IL-6-positive vesicles that are expressed throughout myofibers. Contractions stimulate the rapid reduction of IL-6 in myofibers, occurring through an AMPKα2-independent mechanism. This novel imaging methodology clearly establishes IL-6 as a contraction-stimulated myokine and can be used to characterize the secretion kinetics of other putative myokines.
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Affiliation(s)
- Hans P.M.M. Lauritzen
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
| | - Josef Brandauer
- Department of Health Sciences, Gettysburg College, Gettysburg, Pennsylvania
| | - Peter Schjerling
- Department of Orthopedic Surgery M, Institute of Sports Medicine, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ho-Jin Koh
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
| | - Jonas T. Treebak
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Michael F. Hirshman
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
| | - Henrik Galbo
- Department of Rheumatology and Institute of Inflammation Research, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Laurie J. Goodyear
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
- Corresponding author: Laurie J. Goodyear,
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19
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Sylow L, Jensen TE, Kleinert M, Højlund K, Kiens B, Wojtaszewski J, Prats C, Schjerling P, Richter EA. Rac1 signaling is required for insulin-stimulated glucose uptake and is dysregulated in insulin-resistant murine and human skeletal muscle. Diabetes 2013; 62:1865-75. [PMID: 23423567 PMCID: PMC3661612 DOI: 10.2337/db12-1148] [Citation(s) in RCA: 144] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The actin cytoskeleton-regulating GTPase Rac1 is required for insulin-stimulated GLUT4 translocation in cultured muscle cells. However, involvement of Rac1 and its downstream signaling in glucose transport in insulin-sensitive and insulin-resistant mature skeletal muscle has not previously been investigated. We hypothesized that Rac1 and its downstream target, p21-activated kinase (PAK), are regulators of insulin-stimulated glucose uptake in mouse and human skeletal muscle and are dysregulated in insulin-resistant states. Muscle-specific inducible Rac1 knockout (KO) mice and pharmacological inhibition of Rac1 were used to determine whether Rac1 regulates insulin-stimulated glucose transport in mature skeletal muscle. Furthermore, Rac1 and PAK1 expression and signaling were investigated in muscle of insulin-resistant mice and humans. Inhibition and KO of Rac1 decreased insulin-stimulated glucose transport in mouse soleus and extensor digitorum longus muscles ex vivo. Rac1 KO mice showed decreased insulin and glucose tolerance and trended toward higher plasma insulin concentrations after intraperitoneal glucose injection. Rac1 protein expression and insulin-stimulated PAK(Thr423) phosphorylation were decreased in muscles of high fat-fed mice. In humans, insulin-stimulated PAK activation was decreased in both acute insulin-resistant (intralipid infusion) and chronic insulin-resistant states (obesity and diabetes). These findings show that Rac1 is a regulator of insulin-stimulated glucose uptake and a novel candidate involved in skeletal muscle insulin resistance.
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Affiliation(s)
- Lykke Sylow
- Molecular Physiology Group, Department of Nutrition, Exercise, and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Thomas E. Jensen
- Molecular Physiology Group, Department of Nutrition, Exercise, and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Maximilian Kleinert
- Molecular Physiology Group, Department of Nutrition, Exercise, and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Kurt Højlund
- Diabetes Research Center, Department of Endocrinology, Odense University Hospital, Odense, Denmark
| | - Bente Kiens
- Molecular Physiology Group, Department of Nutrition, Exercise, and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Jørgen Wojtaszewski
- Molecular Physiology Group, Department of Nutrition, Exercise, and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Clara Prats
- Department of Biomedical Sciences, Center of Healthy Aging, University of Copenhagen, Copenhagen, Denmark
| | - Peter Schjerling
- Institute of Sports Medicine, Department of Orthopedic Surgery, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Erik A. Richter
- Molecular Physiology Group, Department of Nutrition, Exercise, and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
- Corresponding author: Erik A. Richter,
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20
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Smith LR, Meyer G, Lieber RL. Systems analysis of biological networks in skeletal muscle function. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2012. [PMID: 23188744 DOI: 10.1002/wsbm.1197] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Skeletal muscle function depends on the efficient coordination among subcellular systems. These systems are composed of proteins encoded by a subset of genes, all of which are tightly regulated. In the cases where regulation is altered because of disease or injury, dysfunction occurs. To enable objective analysis of muscle gene expression profiles, we have defined nine biological networks whose coordination is critical to muscle function. We begin by describing the expression of proteins necessary for optimal neuromuscular junction function that results in the muscle cell action potential. That action potential is transmitted to proteins involved in excitation-contraction coupling enabling Ca(2+) release. Ca(2+) then activates contractile proteins supporting actin and myosin cross-bridge cycling. Force generated by cross-bridges is transmitted via cytoskeletal proteins through the sarcolemma and out to critical proteins that support the muscle extracellular matrix. Muscle contraction is fueled through many proteins that regulate energy metabolism. Inflammation is a common response to injury that can result in alteration of many pathways within muscle. Muscle also has multiple pathways that regulate size through atrophy or hypertrophy. Finally, the isoforms associated with fast muscle fibers and their corresponding isoforms in slow muscle fibers are delineated. These nine networks represent important biological systems that affect skeletal muscle function. Combining high-throughput systems analysis with advanced networking software will allow researchers to use these networks to objectively study skeletal muscle systems.
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Affiliation(s)
- Lucas R Smith
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, USA
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21
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Xia X, Hu Y, Xu L, Chen T. A functional promoter polymorphism ofSLC2A4is associated with aerobic endurance in a Chinese population. Eur J Sport Sci 2012; 14:53-9. [DOI: 10.1080/17461391.2012.726652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Giannocco G, Oliveira KC, Crajoinas RO, Venturini G, Salles TA, Fonseca-Alaniz MH, Maciel RMB, Girardi ACC. Dipeptidyl peptidase IV inhibition upregulates GLUT4 translocation and expression in heart and skeletal muscle of spontaneously hypertensive rats. Eur J Pharmacol 2012; 698:74-86. [PMID: 23051671 DOI: 10.1016/j.ejphar.2012.09.043] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 09/19/2012] [Accepted: 09/21/2012] [Indexed: 12/22/2022]
Abstract
The purpose of the current study was to test the hypothesis that the dipeptidyl peptidase IV (DPPIV) inhibitor sitagliptin, which exerts anti-hyperglycemic and anti-hypertensive effects, upregulates GLUT4 translocation, protein levels, and/or mRNA expression in heart and skeletal muscle of spontaneously hypertensive rats (SHRs). Ten days of treatment with sitagliptin (40 mg/kg twice daily) decreased plasma DPPIV activity in both young (Y, 5-week-old) and adult (A, 20-week-old) SHRs to similar extents (~85%). However, DPPIV inhibition only lowered blood pressure in Y-SHRs (119 ± 3 vs. 136 ± 4 mmHg). GLUT4 translocation, total protein levels and mRNA expression were decreased in the heart, soleus and gastrocnemius muscle of SHRs compared to age-matched Wistar Kyoto (WKY) normotensive rats. These differences were much more pronounced between A-SHRs and A-WKY rats than between Y-SHRs and Y-WKY rats. In Y-SHRs, sitagliptin normalized GLUT4 expression in the heart, soleus and gastrocnemius. In A-SHRs, sitagliptin increased GLUT4 expression to levels that were even higher than those of A-WKY rats. Sitagliptin enhanced the circulating levels of the DPPIV substrate glucagon-like peptide-1 (GLP-1) in SHRs. In addition, stimulation of the GLP-1 receptor in cardiomyocytes isolated from SHRs increased the protein level of GLUT4 by 154 ± 13%. Collectively, these results indicate that DPPIV inhibition upregulates GLUT4 in heart and skeletal muscle of SHRs. The underlying mechanism of sitagliptin-induced upregulation of GLUT4 in SHRs may be, at least partially, attributed to GLP-1.
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Affiliation(s)
- Gisele Giannocco
- Department of Morphology and Physiology, Faculdade de Medicina do ABC, Santo André, São Paulo, SP, Brazil
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Methotrexate Increases Skeletal Muscle GLUT4 Expression and Improves Metabolic Control in Experimental Diabetes. J Nutr Metab 2012; 2012:132056. [PMID: 22778921 PMCID: PMC3384889 DOI: 10.1155/2012/132056] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 03/10/2012] [Accepted: 04/14/2012] [Indexed: 11/17/2022] Open
Abstract
Long-term administration of 5-aminoimidazole-4-carboxamide ribonucleoside (AICAR) mimics the effects of endurance exercise by activating AMP kinase and by increasing skeletal muscle expression of GLUT4 glucose transporter. AICAR is an intermediate in the purine de novo synthesis, and its tissue concentrations can be increased, in vivo, by low doses of methotrexate (MTX) through the inhibition of the enzyme AICAR transformylase. We report here the first evidence that, in experimental type 2 diabetes, chronic treatment with low doses of MTX increases skeletal muscle GLUT4 expression and improves metabolic control. MTX (0.5 mg/kg body weight) or vehicle was administered intraperitoneally, once a week for 4 weeks, to genetically diabetic female C57BL/KsJ-m(+)/(+)Lept(db) mice (db(+)/db(+)) and their normoglycemic littermates (db(+)/(+)m). In the db(+)/db(+) mice, MTX treatment was associated with a ∼2-fold increase in skeletal muscle GLUT4 protein concentration and a >4-fold increase in GLUT4 mRNA expression (P < 0.01, all), as compared to vehicle-treated mice; no significant differences were noted in controls. MTX treatment was also associated with a significant reduction of glucose and insulin serum concentrations in diabetic mice (P < 0.001), and glucose levels only (P < 0.05) in controls. These data indicate a different route to increase skeletal muscle GLUT4 expression, through the potential inhibition of the enzyme AICAR transformylase.
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24
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Lizunov VA, Stenkula KG, Lisinski I, Gavrilova O, Yver DR, Chadt A, Al-Hasani H, Zimmerberg J, Cushman SW. Insulin stimulates fusion, but not tethering, of GLUT4 vesicles in skeletal muscle of HA-GLUT4-GFP transgenic mice. Am J Physiol Endocrinol Metab 2012; 302:E950-60. [PMID: 22297303 PMCID: PMC3330721 DOI: 10.1152/ajpendo.00466.2011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Insulin regulates glucose uptake into fat and muscle by modulating the subcellular distribution of GLUT4 between the cell surface and intracellular compartments. However, quantification of these translocation processes in muscle by classical subcellular fractionation techniques is confounded by contaminating microfibrillar protein; dynamic studies at the molecular level are almost impossible. In this study, we introduce a muscle-specific transgenic mouse model in which HA-GLUT4-GFP is expressed under the control of the MCK promoter. HA-GLUT4-GFP was found to translocate to the plasma membrane and T-tubules after insulin stimulation, thus mimicking endogenous GLUT4. To investigate the dynamics of GLUT4 trafficking in skeletal muscle, we quantified vesicles containing HA-GLUT4-GFP near the sarcolemma and T-tubules and analyzed insulin-stimulated exocytosis at the single vesicle level by total internal reflection fluorescence and confocal microscopy. We found that only 10% of the intracellular GLUT4 pool comprised mobile vesicles, whereas most of the GLUT4 structures remained stationary or tethered at the sarcolemma or T-tubules. In fact, most of the insulin-stimulated exocytosis emanated from pretethered vesicles, whereas the small pool of mobile GLUT4 vesicles was not significantly affected by insulin. Our data strongly suggest that the mobile pool of GLUT4 vesicles is not a major site of insulin action but rather locally distributed. Most likely, pretethered GLUT4 structures are responsible for the initial phase of insulin-stimulated exocytosis.
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Affiliation(s)
- Vladimir A Lizunov
- Program in Physical Biology, National Institute of Child Health and Human Development/National Institutes of Health, Bethesda, MD, USA
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25
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Yu Y, Clippinger AJ, Pierciey FJ, Alwine JC. Viruses and metabolism: alterations of glucose and glutamine metabolism mediated by human cytomegalovirus. Adv Virus Res 2011; 80:49-67. [PMID: 21762821 DOI: 10.1016/b978-0-12-385987-7.00003-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Recent studies of human cytomegalovirus (HCMV) infection have demonstrated that the virus significantly alters cellular metabolism, especially the utilization of glucose and glutamine. Glucose is not broken down by the tricarboxylic acid (TCA) cycle in infected cells; instead, it is used biosynthetically for fatty acid synthesis for membranes needed during the infection. In this chapter, we discuss the possibility that HCMV integrates its mechanisms for manipulating cellular signaling and stress responses to induce novel adipocyte-like differentiation in order to alter metabolism so that glucose can be used synthetically, that is, for fatty acids and lipids. This process diverts glucose from the TCA cycle and requires induction of enzymes that can convert glutamine to α-ketoglutarate to maintain the TCA cycle (anaplerosis). We discuss data proposing that the anaplerotic utilization of glutamine may be mediated, in part, by c-Myc activation, and the induction of adipocyte-like differentiation may result from the activation of the endoplasmic reticulum resident kinase PKR-like ER kinase. These alterations in metabolism during HCMV infection are comparable to those seen in many tumor cells. Indeed, the alterations in cellular signaling, stress responses, and metabolism that have been characterized could result in unexpected pathogenesis, potentially implicating HCMV as an agent or subtle cofactor in many maladies. Better understanding of HCMV's effects on cell signaling and metabolism will show how HCMV-mediated modifications of cellular processes relate to pathogenesis and will suggest novel avenues for antiviral therapy.
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Affiliation(s)
- Yongjun Yu
- Department of Cancer Biology, Abramson Family Cancer Research Institute, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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26
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Ho K. A critically swift response: insulin-stimulated potassium and glucose transport in skeletal muscle. Clin J Am Soc Nephrol 2011; 6:1513-6. [PMID: 21700825 DOI: 10.2215/cjn.04540511] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Toyoda T, An D, Witczak CA, Koh HJ, Hirshman MF, Fujii N, Goodyear LJ. Myo1c regulates glucose uptake in mouse skeletal muscle. J Biol Chem 2010; 286:4133-40. [PMID: 21127070 DOI: 10.1074/jbc.m110.174938] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Contraction and insulin promote glucose uptake in skeletal muscle through GLUT4 translocation to cell surface membranes. Although the signaling mechanisms leading to GLUT4 translocation have been extensively studied in muscle, the cellular transport machinery is poorly understood. Myo1c is an actin-based motor protein implicated in GLUT4 translocation in adipocytes; however, the expression profile and role of Myo1c in skeletal muscle have not been investigated. Myo1c protein abundance was higher in more oxidative skeletal muscles and heart. Voluntary wheel exercise (4 weeks, 8.2 ± 0.8 km/day), which increased the oxidative profile of the triceps muscle, significantly increased Myo1c protein levels by ∼2-fold versus sedentary controls. In contrast, high fat feeding (9 weeks, 60% fat) significantly reduced Myo1c by 17% in tibialis anterior muscle. To study Myo1c regulation of glucose uptake, we expressed wild-type Myo1c or Myo1c mutated at the ATPase catalytic site (K111A-Myo1c) in mouse tibialis anterior muscles in vivo and assessed glucose uptake in vivo in the basal state, in response to 15 min of in situ contraction, and 15 min following maximal insulin injection (16.6 units/kg of body weight). Expression of wild-type Myo1c or K111A-Myo1c had no effect on basal glucose uptake. However, expression of wild-type Myo1c significantly increased contraction- and insulin-stimulated glucose uptake, whereas expression of K111A-Myo1c decreased both contraction-stimulated and insulin-stimulated glucose uptake. Neither wild-type nor K111A-Myo1c expression altered GLUT4 expression, and neither affected contraction- or insulin-stimulated signaling proteins. Myo1c is a novel mediator of both insulin-stimulated and contraction-stimulated glucose uptake in skeletal muscle.
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Affiliation(s)
- Taro Toyoda
- Section on Integrative Physiology and Metabolism, the Joslin Diabetes Center, Boston, Massachusetts 02215, USA
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Lauritzen HP, Galbo H, Toyoda T, Goodyear LJ. Kinetics of contraction-induced GLUT4 translocation in skeletal muscle fibers from living mice. Diabetes 2010; 59:2134-44. [PMID: 20622170 PMCID: PMC2927934 DOI: 10.2337/db10-0233] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
OBJECTIVE Exercise is an important strategy for the treatment of type 2 diabetes. This is due in part to an increase in glucose transport that occurs in the working skeletal muscles. Glucose transport is regulated by GLUT4 translocation in muscle, but the molecular machinery mediating this process is poorly understood. The purpose of this study was to 1) use a novel imaging system to elucidate the kinetics of contraction-induced GLUT4 translocation in skeletal muscle and 2) determine the function of AMP-activated protein kinase alpha2 (AMPKalpha2) in this process. RESEARCH DESIGN AND METHODS Confocal imaging was used to visualize GLUT4-enhanced green fluorescent protein (EGFP) in transfected quadriceps muscle fibers in living mice subjected to contractions or the AMPK-activator AICAR. RESULTS Contraction increased GLUT4-EGFP translocation from intracellular vesicle depots to both the sarcolemma and t-tubules with similar kinetics, although translocation was greater with contractions elicited by higher voltage. Re-internalization of GLUT4 did not begin until 10 min after contractions ceased and was not complete until 130 min after contractions. AICAR increased GLUT4-EGFP translocation to both sarcolemma and t-tubules with similar kinetics. Ablation of AMPKalpha2 activity in AMPKalpha2 inactive transgenic mice did not change GLUT4-EGFP's basal localization, contraction-stimulated intracellular GLUT4-EGFP vesicle depletion, translocation, or re-internalization, but diminished AICAR-induced translocation. CONCLUSIONS We have developed a novel imaging system to study contraction-stimulated GLUT4 translocation in living mice. Contractions increase GLUT4 translocation to the sarcolemma and t-tubules with similar kinetics and do not require AMPKalpha2 activity.
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Affiliation(s)
- Hans P.M.M. Lauritzen
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
| | - Henrik Galbo
- Department of Rheumatology and Institute of Inflammation Research, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Taro Toyoda
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
| | - Laurie J. Goodyear
- Research Division, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
- Corresponding author: Laurie J. Goodyear,
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Abstract
Skeletal muscle plays a key role in regulating whole body glucose homeostasis and severe dysfunction in insulin-mediated glucose uptake is the hallmark of insulin-resistant states and type II diabetes. Therefore it is highly pathophysiologically relevant to perform detailed studies of insulin signaling inside skeletal muscle cells in order to elucidate the specific molecular events during both normal and insulin-resistant conditions. So far, cell biology imaging techniques have been limited to in vitro cultured muscle originating from primary or cell line-based myoblasts. However, these types of cultured muscle lack many characteristics of fully differentiated muscle cells. By performing intravital protein translocation analysis directly in situ in living animals, we have been able to give a high-resolution account of the spatial and temporal details during insulin signaling in vivo in muscle that does not have the limitations of in vitro cultures. We have shown that after i.v. insulin injection, PI3-kinase activation and, in turn, GLUT4 translocation are initiated at the plasma membrane proper, the sarcolemma. Then insulin signaling progresses into the t-tubules with a velocity corresponding to the diffusion of sulforhodamine B-conjugated insulin molecules. By using intravital confocal time-lapse analysis we have revealed that the t-tubules are the membrane surface where the majority of the insulin signaling is located.
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