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Simon L, Bourgeois BL, Molina PE. Alcohol and Skeletal Muscle in Health and Disease. Alcohol Res 2023; 43:04. [PMID: 37937295 PMCID: PMC10627576 DOI: 10.35946/arcr.v43.1.04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023] Open
Abstract
PURPOSE Alcohol-related myopathy is one of the earliest alcohol-associated pathological tissue changes that is progressively exacerbated by cumulative long-term alcohol misuse. Acute and chronic alcohol use leads to changes in skeletal muscle mass and function. As discussed in this evidence-based review, alcohol-mediated mechanisms are multifactorial with effects on anabolic and catabolic signaling, mitochondrial bioenergetics, extracellular matrix remodeling, and epigenomic alterations. However, systematic studies are limited, especially regarding the acute effects of alcohol on skeletal muscle. SEARCH METHODS This review focuses on peer-reviewed manuscripts published between January 2012 and November 2022 using the search terms "alcohol" or "ethanol" and "skeletal muscle" in MEDLINE, PubMed, and Web of Science using EndNote reference management software. SEARCH RESULTS Eligible manuscripts included full-length research papers that discussed acute and chronic effects of alcohol on skeletal muscle mass and function in both clinical and preclinical studies. The review also includes alcohol-mediated skeletal muscle effects in the context of comorbidities. The three databases together yielded 708 manuscripts. Of these, the authors excluded from this review 548 papers that did not have "alcohol" or "muscle" in the title and 64 papers that were duplicates or did not discuss skeletal muscle. Thus, of all the manuscripts considered for this review, 96 are included and 612 are excluded. Additionally, relevant papers published earlier than 2012 are included to provide context to the review. DISCUSSION AND CONCLUSIONS Both acute and chronic alcohol use decrease protein synthesis and increase protein degradation. Alcohol also impairs mitochondrial function and extracellular matrix remodeling. However, there is a gap in the literature on the known alcohol-mediated mechanisms, including senescence, role of immune activation, and interorgan communication, on the development of alcohol-related myopathy. With increased life expectancy, changing alcohol use patterns, and increasing frequency of alcohol use among females, current observational studies are needed on the prevalence of alcohol-related myopathy. Additionally, the compounding effects of acute and chronic alcohol use on skeletal muscle with aging or exercise, in response to injury or disuse, and in the context of comorbidities including diabetes and human immunodeficiency virus (HIV), call for further investigation. Though evidence suggests that abstinence or reducing alcohol use can improve muscle mass and function, they are not restored to normal levels. Hence, understanding the pathophysiological mechanisms can help in the design of therapeutic strategies to improve skeletal muscle health.
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Affiliation(s)
- Liz Simon
- Department of Physiology and Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - Brianna L Bourgeois
- Department of Physiology and Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - Patricia E Molina
- Department of Physiology and Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana
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Motuziuk O, Nozdrenko D, Prylutska S, Vareniuk I, Bogutska K, Braniuk S, Korotkyi O, Prylutskyy Y, Ritter U, Piosik J. The effect of C 60 fullerene on the mechanokinetics of muscle gastrocnemius contraction in chronically alcoholized rats. Heliyon 2023; 9:e18745. [PMID: 37554800 PMCID: PMC10404780 DOI: 10.1016/j.heliyon.2023.e18745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 07/13/2023] [Accepted: 07/26/2023] [Indexed: 08/10/2023] Open
Abstract
The C60 fullerene effect (oral administration at a dose of 1 mg kg-1) on the selected biomechanical parameters of muscle gastrocnemius contraction, biochemical indicators of blood and muscle tissue as well as histological changes in rat muscle tissue after chronic alcoholization for 3, 6 and 9 months was studied in detail. Water-soluble C60 fullerenes were shown to reduce the pathological processes development in the muscle apparatus by an average of (35-40)%. In particular, they reduced the time occurrence of fatigue processes in muscle during the long-term development of alcoholic myopathy and inhibited oxidative processes in muscle, thereby preventing its degradation. These findings open up the possibility of using C60 fullerenes as potent antioxidants for the correction of the pathological conditions of the muscle system arising from alcohol intoxication.
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Affiliation(s)
- Olexandr Motuziuk
- Faculty of Biology and Forestry, Lesya Ukrainka Volyn National University, Lutsk, 43025, Ukraine
- Department of Biophysics and Medical Informatics, ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
| | - Dmytro Nozdrenko
- Department of Biophysics and Medical Informatics, ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
| | - Svitlana Prylutska
- Department of Physiology, Plant Biochemistry and Bioenergetics, Faculty of Plant Protection, Biotechnology and Ecology, National University of Life and Environmental Science of Ukraine, Kyiv, 03041, Ukraine
| | - Igor Vareniuk
- Department of Biophysics and Medical Informatics, ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
| | - Kateryna Bogutska
- Department of Biophysics and Medical Informatics, ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
| | - Serhii Braniuk
- Faculty of Biology and Forestry, Lesya Ukrainka Volyn National University, Lutsk, 43025, Ukraine
| | - Olexandr Korotkyi
- Department of Biophysics and Medical Informatics, ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
| | - Yuriy Prylutskyy
- Department of Biophysics and Medical Informatics, ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
| | - Uwe Ritter
- Institute of Chemistry and Biotechnology, Technical University of Ilmenau, Ilmenau, 98693, Germany
| | - Jacek Piosik
- Intercollegiate Faculty of Biotechnology, University of Gdansk, 80-307, Gdańsk, Poland
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Grochowski C, Blicharska E, Baj J, Mierzwińska A, Brzozowska K, Forma A, Maciejewski R. Serum iron, Magnesium, Copper, and Manganese Levels in Alcoholism: A Systematic Review. Molecules 2019; 24:E1361. [PMID: 30959950 PMCID: PMC6480471 DOI: 10.3390/molecules24071361] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 04/03/2019] [Accepted: 04/06/2019] [Indexed: 01/03/2023] Open
Abstract
The aim of this paper was to review recent literature (from 2000 onwards) and summarize the newest findings on fluctuations in the concentration of some essential macro- and microelements in those patients with a history of chronic alcohol abuse. The focus was mainly on four elements which the authors found of particular interest: Iron, magnesium, copper, and manganese. After independently reviewing over 50 articles, the results were consistent with regard to iron and magnesium. On the other hand, data were limited, and in some cases contradictory, as far as copper and manganese were concerned. Iron overload and magnesium deficiency are two common results of an excessive and prolonged consumption of alcohol. An increase in the levels of iron can be seen both in the serum and within the cells, hepatocytes in particular. This is due to a number of factors: Increased ferritin levels, lower hepcidin levels, as well as some fluctuations in the concentration of the TfR receptor for transferrin, among others. Hypomagnesemia is universally observed among those suffering from alcoholism. Again, the causes for this are numerous and include malnutrition, drug abuse, respiratory alkalosis, and gastrointestinal problems, apart from the direct influence of excessive alcohol intake. Unfortunately, studies regarding the levels of both copper and manganese in the case of (alcoholic) liver disease are scarce and often contradictory. Still, the authors have attempted to summarize and give a thorough insight into the literature available, bearing in mind the difficulties involved in the studies. Frequent comorbidities and mutual relationships between the elements in question are just some of the complications in the study of this topic.
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Affiliation(s)
- Cezary Grochowski
- Chair and Department of Anatomy, Medical University of Lublin, 20-090 Lublin, Poland; (J.B.); (R.M.)
- Department of Neurosurgery and Pediatric Neurosurgery, Medical University of Lublin, 20-090 Lublin, Poland
| | - Eliza Blicharska
- Department of Analitical Chemistry, Medical University of Lublin, 20-090 Lublin, Poland;
| | - Jacek Baj
- Chair and Department of Anatomy, Medical University of Lublin, 20-090 Lublin, Poland; (J.B.); (R.M.)
| | - Aleksandra Mierzwińska
- Department of Forensic Medicine, Medical University of Lublin, 20-090 Lublin, Poland; (A.M.); (K.B.); aforma@o2pl (A.F.)
| | - Karolina Brzozowska
- Department of Forensic Medicine, Medical University of Lublin, 20-090 Lublin, Poland; (A.M.); (K.B.); aforma@o2pl (A.F.)
| | - Alicja Forma
- Department of Forensic Medicine, Medical University of Lublin, 20-090 Lublin, Poland; (A.M.); (K.B.); aforma@o2pl (A.F.)
| | - Ryszard Maciejewski
- Chair and Department of Anatomy, Medical University of Lublin, 20-090 Lublin, Poland; (J.B.); (R.M.)
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Cholecalciferol in ethanol-preferring rats muscle fibers increases the number and area of type II fibers. Acta Histochem 2018; 120:789-796. [PMID: 30224245 DOI: 10.1016/j.acthis.2018.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 09/06/2018] [Accepted: 09/07/2018] [Indexed: 11/21/2022]
Abstract
The chronic use of ethanol causes neuropathy and atrophy of type II fibers and promotes vitamin D decrease. This study evaluated cholecalciferol effects on the deep fibular nerve and extensor digitorum longus (EDL) muscle using an UChB ethanol-preferring rats model. Blood analyses were carried out to measure levels of 25-hydroxycholecalciferol (25(OH)D), calcium (Ca2+), Phosphorus (P), and parathyroid hormone (PTH). It was used EDL muscle to evaluate oxidative stress. The deep fibular nerve and EDL muscle were used for morphologic and morphometric assessment. 25(OH)D plasma levels were higher in the supplemented group and no alterations were observed in other parameters including the oxidative stress evaluation. The G ratio remained constant which indicates nervous conduction normality. Cholecalciferol supplementation promoted an increase in the number and area of type II fibers and a decrease in the area of type I fibers. In the studied model, there was neither alcoholic myopathy nor neuropathy. The EDL muscle glycolytic patterns in the high-drinker UChB rats may be associated with the differential effects of cholecalciferol on metabolism and protein synthesis in skeletal muscle.
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Zinc deficiency as a mediator of toxic effects of alcohol abuse. Eur J Nutr 2017; 57:2313-2322. [PMID: 29177978 DOI: 10.1007/s00394-017-1584-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 11/20/2017] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To review data on the role of ethanol-induced alteration of Zn homeostasis in mediation of adverse effects of alcohol abuse. METHODS The scholarly published articles on the association between Zn metabolism and alcohol-associated disorders (liver, brain, lung, gut dysfunction, and fetal alcohol syndrome) have been reviewed. RESULTS It is demonstrated that alcohol-induced modulation of zinc transporters results in decreased Zn levels in lungs, liver, gut, and brain. Zn deficiency in the gut results in increased gut permeability, ultimately leading to endotoxemia and systemic inflammation. Similarly, Zn deficiency in lung epithelia and alveolar macrophages decreases lung barrier function resulting in respiratory distress syndrome. In turn, increased endotoxemia significantly contributes to proinflammatory state in alcoholic liver disease. Finally, impaired gut and liver functions may play a significant role in alcoholic brain damage, being associated with both increased proinflammatory signaling and accumulation of neurotoxic metabolites. It is also hypothesized that ethanol-induced Zn deficiency may interfere with neurotransmission. Similar changes may take place in the fetus as a result of impaired placental zinc transfer, maternal zinc deficiency, or maternal Zn sequestration, resulting in fetal alcoholic syndrome. Therefore, alcoholic Zn deficiency not only mediates the adverse effects of ethanol exposure, but also provides an additional link between different alcohol-induced disorders. CONCLUSIONS Generally, current findings suggest that assessment of Zn status could be used as a diagnostic marker of metabolic disturbances in alcohol abuse, whereas modulation of Zn metabolism may be a potential tool in the treatment of alcohol-associated disorders.
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Skallerup A, Nygaard L, Olesen SS, Køhler M, Vinter-Jensen L, Rasmussen HH. The prevalence of sarcopenia is markedly increased in patients with intestinal failure and associates with several risk factors. Clin Nutr 2017; 37:2029-2035. [PMID: 29029893 DOI: 10.1016/j.clnu.2017.09.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 09/07/2017] [Accepted: 09/19/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND & AIMS Intestinal insufficiency and intestinal failure are conditions associated with malabsorption of micro- and macronutrients. Consequently, malnutrition and ensuing alterations in body composition are common in this context and patients may have an increased risk of progressive loss of skeletal muscle mass and function (i.e. sarcopenia). We investigated the prevalence of sarcopenia in patients with intestinal insufficiency and intestinal failure and identified associated risk factors. METHODS This was a cross-sectional study including 113 clinically stable outpatients with intestinal insufficiency or intestinal failure. Body composition was assessed using bioelectrical impedance analysis and muscle function (strength or performance) using a handheld dynamometer and a timed up-and-go test. Sarcopenia was classified using the European Working Group on Sarcopenia in Older People criteria. Several parameters, including smoking, alcohol, and concurrent morbidities, were analyzed for association with sarcopenia. RESULTS The prevalence of sarcopenia was 53.1% (95% CI; 43.8 to 62.2) in the combined patient group. In patients with intestinal failure the prevalence of sarcopenia was 72.7% (95% CI; 59.3 to 83.0) compared to 34.5% (95% CI; 23.3 to 47.8) in those with intestinal insufficiency (OR 5.07 [95% CI; 2.27 to 11.31]; p < 0.001). Excessive alcohol consumption (OR 7.69 [95% CI; 1.50 to 39.34]; p = 0.014), intestinal failure (OR 4.16 [95% CI; 1.69 to 10.28]; p = 0.002), and inflammatory activity (OR 3.83 [95% CI; 1.06 to 12.84]; p = 0.041), were identified as independent risk factors of sarcopenia. A trend was observed for hypermetabolism in multivariate analysis (OR 7.55 [95% CI; 0.79 to 72.03]; p = 0.079). CONCLUSIONS Patients with intestinal insufficiency and intestinal failure are at immense risk of developing sarcopenia. Associated risk factors are excessive alcohol consumption, intestinal failure, and inflammatory activity.
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Affiliation(s)
- Anders Skallerup
- Center for Nutrition and Bowel Disease, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark.
| | - Louis Nygaard
- Center for Nutrition and Bowel Disease, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark
| | - Søren Schou Olesen
- Clinical Institute, Aalborg University, Aalborg, Denmark; Center for Pancreatic Diseases, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark
| | - Marianne Køhler
- Center for Nutrition and Bowel Disease, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark
| | - Lars Vinter-Jensen
- Center for Nutrition and Bowel Disease, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark; Clinical Institute, Aalborg University, Aalborg, Denmark
| | - Henrik Højgaard Rasmussen
- Center for Nutrition and Bowel Disease, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark; Clinical Institute, Aalborg University, Aalborg, Denmark
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González-Reimers E, Santolaria-Fernández F, Martín-González MC, Fernández-Rodríguez CM, Quintero-Platt G. Alcoholism: A systemic proinflammatory condition. World J Gastroenterol 2014; 20:14660-14671. [PMID: 25356029 PMCID: PMC4209532 DOI: 10.3748/wjg.v20.i40.14660] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 05/29/2014] [Indexed: 02/06/2023] Open
Abstract
Excessive ethanol consumption affects virtually any organ, both by indirect and direct mechanisms. Considerable research in the last two decades has widened the knowledge about the paramount importance of proinflammatory cytokines and oxidative damage in the pathogenesis of many of the systemic manifestations of alcoholism. These cytokines derive primarily from activated Kupffer cells exposed to Gram-negative intestinal bacteria, which reach the liver in supra-physiological amounts due to ethanol-mediated increased gut permeability. Reactive oxygen species (ROS) that enhance the inflammatory response are generated both by activation of Kupffer cells and by the direct metabolic effects of ethanol. The effects of this increased cytokine secretion and ROS generation lie far beyond liver damage. In addition to the classic consequences of endotoxemia associated with liver cirrhosis that were described several decades ago, important research in the last ten years has shown that cytokines may also induce damage in remote organs such as brain, bone, muscle, heart, lung, gonads, peripheral nerve, and pancreas. These effects are even seen in alcoholics without significant liver disease. Therefore, alcoholism can be viewed as an inflammatory condition, a concept which opens the possibility of using new therapeutic weapons to treat some of the complications of this devastating and frequent disease. In this review we examine some of the most outstanding consequences of the altered cytokine regulation that occurs in alcoholics in organs other than the liver.
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Gonzalez-Reimers E, Duran-Castellon MC, Lopez-Lirola A, Santolaria-Fernandez F, Abreu-Gonzalez P, Alvisa-Negrin J, Sanchez-Perez MJ. Alcoholic Myopathy: Vitamin D Deficiency is Related to Muscle Fibre Atrophy in a Murine Model. Alcohol Alcohol 2010; 45:223-230. [DOI: 10.1093/alcalc/agq010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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Otis JS, Guidot DM. Procysteine stimulates expression of key anabolic factors and reduces plantaris atrophy in alcohol-fed rats. Alcohol Clin Exp Res 2009; 33:1450-9. [PMID: 19426167 DOI: 10.1111/j.1530-0277.2009.00975.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Long-term alcohol ingestion may produce severe oxidant stress and lead to skeletal muscle dysfunction. Emerging evidence has suggested that members of the interleukin-6 (IL-6) family of cytokines play diverse roles in the regulation of skeletal muscle mass. Thus, our goals were (i) to minimize the degree of oxidant stress and attenuate atrophy by supplementing the diets of alcohol-fed rats with the glutathione precursor, procysteine, and (ii) to identify the roles of IL-6 family members in alcoholic myopathy. METHODS Age- and gender-matched Sprague-Dawley rats were fed the Lieber-DeCarli liquid diet containing either alcohol or an isocaloric substitution (control diet) for 35 weeks. Subgroups of alcohol-fed rats received procysteine (0.35%, w/v) for the final 12 weeks. Plantaris morphology was assessed by hematoxylin and eosin staining. Major components of glutathione metabolism were determined using assay kits. Real-time PCR was used to determine expression levels of several genes. RESULTS Plantaris muscles from alcohol-fed rats displayed extensive atrophy, as well as decreased glutathione levels, decreased activities of glutathione reductase and glutathione peroxidase, decreased superoxide dismutase (SOD)-2 (Mn-SOD2), and increased NADPH oxidase-1 gene expression-each indicative of significant oxidant stress. Alcohol also induced gene expression of catabolic factors including IL-6, oncostatin M, atrogin-1, muscle ring finger protein-1, and IGFBP-1. Procysteine treatment attenuated plantaris atrophy, restored glutathione levels, and increased catalase, Cu/Zn-SOD1, and Mn-SOD2 mRNA expression, but did not reduce other markers of oxidant stress or levels of these catabolic factors. Instead, procysteine stimulated gene expression of anabolic factors such as insulin-like growth factor-1, ciliary neurotrophic factor, and cardiotrophin-1. CONCLUSIONS Procysteine significantly attenuated, but did not completely abrogate, alcohol-induced oxidant stress or catabolic factors. Rather, procysteine minimized the extent of plantaris atrophy by inducing components of several anabolic pathways. Therefore, anti-oxidant treatments such as procysteine supplementation may benefit individuals with alcoholic myopathy.
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Affiliation(s)
- Jeffrey S Otis
- Center for Emory University School of Medicine-Pulmonary, Allergy and Critical Care Medicine and Atlanta VA Medical Center, Decatur, Georgia 30002, USA.
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Fernandez-Solà J, Preedy VR, Lang CH, Gonzalez-Reimers E, Arno M, Lin JCI, Wiseman H, Zhou S, Emery PW, Nakahara T, Hashimoto K, Hirano M, Santolaria-Fernández F, González-Hernández T, Fatjó F, Sacanella E, Estruch R, Nicolás JM, Urbano-Márquez A. Molecular and cellular events in alcohol-induced muscle disease. Alcohol Clin Exp Res 2008; 31:1953-62. [PMID: 18034690 DOI: 10.1111/j.1530-0277.2007.00530.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Alcohol consumption induces a dose-dependent noxious effect on skeletal muscle, leading to progressive functional and structural damage of myocytes, with concomitant reductions in lean body mass. Nearly half of high-dose chronic alcohol consumers develop alcoholic skeletal myopathy. The pathogenic mechanisms that lie between alcohol intake and loss of muscle tissue involve multiple pathways, making the elucidation of the disease somewhat difficult. This review discusses the recent advances in basic and clinical research on the molecular and cellular events involved in the development of alcohol-induced muscle disease. The main areas of recent research interest on this field are as follows: (i) molecular mechanisms in alcohol exposed muscle in the rat model; (ii) gene expression changes in alcohol exposed muscle; (iii) the role of trace elements and oxidative stress in alcoholic myopathy; and (iv) the role of apoptosis and preapoptotic pathways in alcoholic myopathy. These aforementioned areas are crucial in understanding the pathogenesis of this disease. For example, there is overwhelming evidence that both chronic alcohol ingestion and acute alcohol intoxication impair the rate of protein synthesis of myofibrillar proteins, in particular, under both postabsorptive and postprandial conditions. Perturbations in gene expression are contributory factors to the development of alcoholic myopathy, as ethanol-induced alterations are detected in over 400 genes and the protein profile (i.e., the proteome) of muscle is also affected. There is supportive evidence that oxidative damage is involved in the pathogenesis of alcoholic myopathy. Increased lipid peroxidation is related to muscle fibre atrophy, and reduced serum levels of some antioxidants may be related to loss of muscle mass and muscle strength. Finally, ethanol induces skeletal muscle apoptosis and increases both pro- and antiapoptotic regulatory mechanisms.
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Otis JS, Brown LAS, Guidot DM. Oxidant-induced atrogin-1 and transforming growth factor-beta1 precede alcohol-related myopathy in rats. Muscle Nerve 2007; 36:842-8. [PMID: 17721978 PMCID: PMC3157955 DOI: 10.1002/mus.20883] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Alcohol-related chronic myopathy is characterized by severe biochemical and structural changes to skeletal muscle. Our goals were to: (1) identify early regulatory elements that precede the overt manifestation of plantaris atrophy; and (2) circumvent these derangements by supplementing alcohol-fed rats with the glutathione precursor, procysteine. After 6 weeks of daily ingestion, before the development of overt atrophy of the plantaris muscle, alcohol increased several markers of oxidative stress and increased gene expressions of atrogin-1 and transforming growth factor-beta1 (TGF-beta1) by approximately 60- and approximately 65-fold, respectively, which were attenuated by procysteine supplementation. Interestingly, after 28 weeks of alcohol ingestion, when overt plantaris atrophy had developed, atrogin-1 and TGF-beta1 gene expression had returned to baseline levels. Together, these findings suggest that alcohol-induced, redox-sensitive alterations drive pro-atrophy signaling pathways that precede muscle atrophy. Therefore, targeted anti-oxidant treatments such as procysteine supplementation may benefit individuals with chronic alcohol abuse, particularly if given prior to the development of clinically significant myopathy.
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Affiliation(s)
- Jeffrey S Otis
- Pulmonary, Allergy and Critical Care Medicine, Atlanta VA Medical Center, Emory University School of Medicine, Decatur, Georgia 30033, USA.
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