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Simon LH, Garritson J, Pullen N, Hayward R. Exercise Preconditioning Preserves Cardiac Function and Enhances Cardiac Recovery Following Dobutamine Stimulation in Doxorubicin-Treated Rat Hearts. J Cardiovasc Pharmacol 2024; 84:188-198. [PMID: 38814887 DOI: 10.1097/fjc.0000000000001583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 04/08/2024] [Indexed: 06/01/2024]
Abstract
ABSTRACT Exercise preconditioning has been shown to protect against doxorubicin (DOX)-induced cardiac dysfunction when hearts are maintained under resting conditions. However, it is unclear whether this exercise-induced protective effect is maintained when the heart is challenged with the β 1 -adrenergic receptor agonist dobutamine (DOB), which mimics acute exercise stress. Fischer 344 rats were randomly assigned to sedentary (SED) or voluntary wheel running (WR) groups for 10 weeks. At week 11, rats were treated with either 15 mg/kg DOX or saline. Five days later, ex vivo cardiac function was assessed using an isolated working heart model at baseline, during the infusion of 7.5 μg·kg -1 ·min -1 DOB, and during recovery. DOB infusion significantly increased left ventricular developed pressure (LVDP), maximal (dP/dt max ) and minimal (dP/dt min ) rate of left ventricular pressure development, and heart rate in all groups ( P < 0.05). SED + DOX also showed a lower baseline and recovery LVDP than WR + DOX (83 ± 12 vs. 109 ± 6 mm Hg baseline, 76 ± 11 vs. 100 ± 10 mm Hg recovery, P < 0.05). WR + DOX showed higher dP/dt max and lower dP/dt min when compared with SED + DOX during DOB infusion (7311 ± 1481 vs. 5167 ± 1436 mm Hg/s and -4059 ± 1114 vs.-3158 ± 1176 mm Hg/s, respectively). SED + DOX dP/dt max was significantly lower during baseline and during recovery when compared with all other groups ( P < 0.05). These data suggest that exercise preconditioning preserved cardiac function after DOX exposure even when the heart is challenged with DOB, and it appeared to preserve the heart's ability to recover from this functional challenge.
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Affiliation(s)
- Lea Haverbeck Simon
- Department of Kinesiology, Nutrition, and Dietetics, and the University of Northern Colorado Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, CO; and
| | - Jacob Garritson
- Department of Kinesiology, Nutrition, and Dietetics, and the University of Northern Colorado Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, CO; and
| | - Nicholas Pullen
- Department of Biological Sciences, University of Northern Colorado, Greeley, CO
| | - Reid Hayward
- Department of Kinesiology, Nutrition, and Dietetics, and the University of Northern Colorado Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, CO; and
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2
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Boeno FP, Patel J, Montalvo RN, Lapierre-Nguyen SS, Schreiber CM, Smuder AJ. Effects of Exercise Preconditioning on Doxorubicin-Induced Liver and Kidney Toxicity in Male and Female Rats. Int J Mol Sci 2023; 24:10222. [PMID: 37373368 DOI: 10.3390/ijms241210222] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 05/31/2023] [Accepted: 06/14/2023] [Indexed: 06/29/2023] Open
Abstract
Doxorubicin (DOX) is a highly effective chemotherapy agent prescribed for cancer treatment. However, the clinical use of DOX is limited due to off-target toxicity in healthy tissues. In this regard, hepatic and renal metabolic clearance results in DOX accumulation within these organ systems. Within the liver and kidneys, DOX causes inflammation and oxidative stress, which promotes cytotoxic cellular signaling. While there is currently no standard of care to treat DOX hepatic- and nephrotoxicity, endurance exercise preconditioning may be an effective intervention to prevent elevations in liver alanine transaminase (ALT) and aspartate aminotransferase (AST) and to improve kidney creatinine clearance. To determine whether exercise preconditioning is sufficient to reduce liver and kidney toxicity resulting from acute exposure to DOX chemotherapy treatment, male and female Sprague-Dawley rats remained sedentary or were exercise trained prior to saline or DOX exposure. Our findings demonstrate that DOX treatment elevated AST and AST/ALT in male rats, with no effects of exercise preconditioning to prevent these increases. We also showed increased plasma markers of renin-angiotensin-aldosterone system (RAAS) activation and urine markers of proteinuria and proximal tubule damage, with male rats revealing greater differences compared to females. Exercise preconditioning showed improved urine creatinine clearance and reduced cystatin c in males, while females had reduced plasma angiotensin II (AngII) levels. Our results demonstrate both tissue- and sex-specific responses related to the effects of exercise preconditioning and DOX treatment on markers of liver and kidney toxicity.
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Affiliation(s)
- Franccesco P Boeno
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, FL 32608, USA
| | - Jay Patel
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, FL 32608, USA
| | - Ryan N Montalvo
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, FL 32608, USA
| | | | - Claire M Schreiber
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, FL 32608, USA
| | - Ashley J Smuder
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, FL 32608, USA
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Mackay AD, Marchant ED, Munk DJ, Watt RK, Hansen JM, Thomson DM, Hancock CR. Multitissue analysis of exercise and metformin on doxorubicin-induced iron dysregulation. Am J Physiol Endocrinol Metab 2019; 316:E922-E930. [PMID: 30888858 DOI: 10.1152/ajpendo.00140.2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Doxorubicin (DOX) is an effective chemotherapeutic treatment with lasting side effects in heart and skeletal muscle. DOX is known to bind with iron, contributing to oxidative damage resulting in cardiac and skeletal muscle toxicity. However, major cellular changes to iron regulation in response to DOX are poorly understood in liver, heart, and skeletal muscle. Additionally, two cotreatments, exercise (EX) and metformin (MET), were studied for their effectiveness in reducing DOX toxicity by ameliorating iron dysregulation and preventing oxidative stress. The purposes of this study were to 1) characterize the DOX-induced changes of the major iron regulation pathway in liver, heart, and skeletal muscle and 2) to determine whether EX and MET exert their benefits by minimizing DOX-induced iron dysregulation. Mice were assigned to receive saline or DOX (15 mg/kg) treatments, paired with either EX (5 days) or MET (500 mg/kg), and were euthanized 3 days after DOX treatment. Results suggest that the cellular response to DOX is protective against oxidative stress by reducing iron availability. DOX increased iron storage capacity through elevated ferritin levels in liver, heart, and skeletal muscle. DOX reduced iron transport capacity through reduced transferrin receptor levels in heart and skeletal muscle. EX and MET cotreatments had protective effects in the liver through reduced transferrin receptor levels. At 3 days after DOX, oxidative stress was mild, as shown by normal glutathione and lipid peroxidation levels. Together these results suggest that the cellular response to reduce iron availability in response to DOX treatment is sufficient to match oxidative stress.
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Affiliation(s)
- Amy D Mackay
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University , Provo, Utah
| | - Erik D Marchant
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University , Provo, Utah
| | - Devin J Munk
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University , Provo, Utah
| | - Richard K Watt
- Department of Chemistry and Biochemistry, Brigham Young University , Provo, Utah
| | - Jason M Hansen
- Department of Physiology and Developmental Biology, Brigham Young University , Provo, Utah
| | - David M Thomson
- Department of Physiology and Developmental Biology, Brigham Young University , Provo, Utah
| | - Chad R Hancock
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University , Provo, Utah
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4
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Plappert-Helbig U, Libertini S, Frieauff W, Theil D, Martus HJ. Gamma-H2AX immunofluorescence for the detection of tissue-specific genotoxicity in vivo. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2019; 60:4-16. [PMID: 30307065 DOI: 10.1002/em.22238] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/04/2018] [Accepted: 07/09/2018] [Indexed: 06/08/2023]
Abstract
The phosphorylation of histone H2AX in Serine 139 (gamma-H2AX) marks regions of DNA double strand breaks and contributes to the recruitment of DNA repair factors to the site of DNA damage. Gamma-H2AX is used widely as DNA damage marker in vitro, but its use for genotoxicity assessment in vivo has not been extensively investigated. Here, we developed an image analysis system for the precise quantification of the gamma-H2AX signal, which we used to monitor DNA damage in animals treated with known genotoxicants (EMS, ENU and doxorubicin). To compare this new assay to a validated standard procedure for DNA damage quantification, tissues from the same animals were also analyzed in the comet assay. An increase in the levels of gamma-H2AX was observed in most of the tissues from animals treated with doxorubicin and ENU. Interestingly, the lesions induced by doxorubicin were not easily detected by the standard comet assay, while they were clearly identified by gamma-H2AX staining. Conversely, EMS appeared strongly positive in the comet assay but only mildly in the gamma-H2AX immunofluorescence. These observations suggest that the two methods could complement each other for DNA damage analysis, where gamma-H2AX staining allows the detection of tissue-specific effects in situ. Moreover, since gamma-H2AX staining can be performed on formalin-fixed and paraffin-embedded tissue sections generated during repeated-dose toxicity studies, it does not require any further treatments or extra procedures during dissection, thus optimizing the use of resources and animals. Environ. Mol. Mutagen. 60:4-16, 2019. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
| | - Silvana Libertini
- Novartis Institutes for BioMedical Research, 4002 Basel, Switzerland
| | - Wilfried Frieauff
- Novartis Institutes for BioMedical Research, 4002 Basel, Switzerland
| | - Diethilde Theil
- Novartis Institutes for BioMedical Research, 4002 Basel, Switzerland
| | - Hans-Jörg Martus
- Novartis Institutes for BioMedical Research, 4002 Basel, Switzerland
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Manjanatha MG, Bishop ME, Pearce MG, Kulkarni R, Lyn-Cook LE, Ding W. Genotoxicity of doxorubicin in F344 rats by combining the comet assay, flow-cytometric peripheral blood micronucleus test, and pathway-focused gene expression profiling. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2014; 55:24-34. [PMID: 24155181 DOI: 10.1002/em.21822] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/18/2013] [Accepted: 09/18/2013] [Indexed: 06/02/2023]
Abstract
Doxorubicin (DOX) is an antineoplastic drug effective against many human malignancies. DOX's clinical efficacy is greatly limited because of severe cardiotoxicity. To evaluate if DOX is genotoxic in the heart, ~7-week-old, male F344 rats were administered intravenously 1, 2, and 3 mg/kg bw DOX at 0, 24, 48, and 69 hr and the Comet assays in heart, liver, kidney, and testis and micronucleus (MN) assay in the peripheral blood (PB) erythrocytes using flow cytometry were conducted. Rats were euthanized at 72 hr and PB was removed for the MN assay and single cells were isolated from multiple tissues for the Comet assays. None of the doses of DOX induced a significant DNA damage in any of the tissues examined by the alkaline Comet assay. Contrastingly, the glycosylase enzymes-modified Comet assay showed a significant dose dependent increase in the oxidative DNA damage in the cardiac tissue (P ≤ 0.05). In the liver, only the top dose induced significant increase in the oxidative DNA damage (P ≤ 0.05). The histopathology showed no severe cardiotoxicity but non-neoplastic lesions were present in both untreated and treated samples. A severe toxicity likely occurred in the bone marrow because no viable reticulocytes could be screened for the MN assay. Gene expression profiling of the heart tissues showed a significant alteration in the expression of 11 DNA damage and repair genes. These results suggest that DOX is genotoxic in the heart and the DNA damage may be induced primarily via the production of reactive oxygen species.
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Affiliation(s)
- Mugimane G Manjanatha
- Division of Genetic and Molecular Toxicology, US Food and Drug Administration, National Center for Toxicological Research, Jefferson, Arkansas
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Jorge Carneiro Neto N, Sgarbi MWM, Gomes de Moura CF, de Jesus GPP, Ribeiro DA. Limb compression induces multi-system genetic damage in rats. ACTA ACUST UNITED AC 2013; 20:237-41. [PMID: 24239493 DOI: 10.1016/j.pathophys.2013.10.002] [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: 04/17/2013] [Revised: 10/01/2013] [Accepted: 10/15/2013] [Indexed: 11/19/2022]
Abstract
Muscle crush injury is a common trauma in the modern society after as a result of mass disasters after penetration into muscle by high-velocity projectiles, blunt external trauma, or by gravity during prolonged immobilization in comatose patients after head trauma, alcoholic or drug overdose. However, the underlying mechanisms linking these alterations are still not fully understood, especially in acute phase. The aim of this study was to analyze genomic instability in multiple organs of rats after acute muscle injury by means of single cell gel (comet) assay. Rats were randomly distributed into three groups (n=6 each group): control group and experimental groups: sacrificed 6h as 12h after muscle compression. These results indicate genetic damage in peripheral blood cells as depicted by tail moment results. DNA breakage was also detected in liver, lung and kidney cells after acute muscle injury for two times evaluated. Heart cells showed genetic damage after 12h following muscle compression. Taken together, our results suggest that acute muscle injury induces genomic damage in multiple organs of Wistar rats. This novel finding offers new insights into the underlying mechanisms of the relationship between acute crush muscle injury and clinical manifestations that can occur during limb compression.
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Gibson NM, Quinn CJ, Pfannenstiel KB, Hydock DS, Hayward R. Effects of age on multidrug resistance protein expression and doxorubicin accumulation in cardiac and skeletal muscle. Xenobiotica 2013; 44:472-9. [DOI: 10.3109/00498254.2013.846489] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Pereira BC, Pauli JR, Antunes LMG, de Freitas EC, de Almeida MR, de Paula Venâncio V, Ropelle ER, de Souza CT, Cintra DE, Papoti M, da Silva ASR. Overtraining is associated with DNA damage in blood and skeletal muscle cells of Swiss mice. BMC PHYSIOLOGY 2013; 13:11. [PMID: 24099482 PMCID: PMC3852772 DOI: 10.1186/1472-6793-13-11] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 10/03/2013] [Indexed: 11/24/2022]
Abstract
BACKGROUND The alkaline version of the single-cell gel (comet) assay is a useful method for quantifying DNA damage. Although some studies on chronic and acute effects of exercise on DNA damage measured by the comet assay have been performed, it is unknown if an aerobic training protocol with intensity, volume, and load clearly defined will improve performance without leading to peripheral blood cell DNA damage. In addition, the effects of overtraining on DNA damage are unknown. Therefore, this study aimed to examine the effects of aerobic training and overtraining on DNA damage in peripheral blood and skeletal muscle cells in Swiss mice. To examine possible changes in these parameters with oxidative stress, we measured reduced glutathione (GSH) levels in total blood, and GSH levels and lipid peroxidation in muscle samples. RESULTS Performance evaluations (i.e., incremental load and exhaustive tests) showed significant intra and inter-group differences. The overtrained (OTR) group showed a significant increase in the percentage of DNA in the tail compared with the control (C) and trained (TR) groups. GSH levels were significantly lower in the OTR group than in the C and TR groups. The OTR group had significantly higher lipid peroxidation levels compared with the C and TR groups. CONCLUSIONS Aerobic and anaerobic performance parameters can be improved in training at maximal lactate steady state during 8 weeks without leading to DNA damage in peripheral blood and skeletal muscle cells or to oxidative stress in skeletal muscle cells. However, overtraining induced by downhill running training sessions is associated with DNA damage in peripheral blood and skeletal muscle cells, and with oxidative stress in skeletal muscle cells and total blood.
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Affiliation(s)
- Bruno Cesar Pereira
- Universidade de São Paulo (USP), Escola de Educação Física e Esporte de Ribeirão Preto (EEFERP), Ribeirão Preto, São Paulo, Brasil
| | - José Rodrigo Pauli
- Universidade Estadual Paulista (UNESP), Curso de Pós-graduação em Ciências da Motricidade Humana, Rio Claro, São Paulo, Brasil
| | - Lusânia Maria Greggi Antunes
- Universidade de São Paulo (USP), Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas Toxicológicas e Bromatológicas, Ribeirão Preto, São Paulo, Brasil
| | - Ellen Cristini de Freitas
- Universidade de São Paulo (USP), Escola de Educação Física e Esporte de Ribeirão Preto (EEFERP), Ribeirão Preto, São Paulo, Brasil
| | - Mara Ribeiro de Almeida
- Universidade de São Paulo (USP), Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas Toxicológicas e Bromatológicas, Ribeirão Preto, São Paulo, Brasil
| | - Vinícius de Paula Venâncio
- Universidade de São Paulo (USP), Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas Toxicológicas e Bromatológicas, Ribeirão Preto, São Paulo, Brasil
| | - Eduardo Rochete Ropelle
- Universidade Estadual de Campinas (UNICAMP), Faculdade de Ciências Aplicadas, Curso de Pós-graduação em Nutrição, Esporte e Metabolismo, Limeira, São Paulo, Brasil
| | - Claudio Teodoro de Souza
- Universidade do Extremo Sul Catarinense, Laboratório de Bioquímica e Fisiologia, Criciúma, Santa Catarina, Brasil
| | - Dennys Esper Cintra
- Universidade Estadual de Campinas (UNICAMP), Faculdade de Ciências Aplicadas, Curso de Pós-graduação em Nutrição, Esporte e Metabolismo, Limeira, São Paulo, Brasil
| | - Marcelo Papoti
- Universidade de São Paulo (USP), Escola de Educação Física e Esporte de Ribeirão Preto (EEFERP), Ribeirão Preto, São Paulo, Brasil
| | - Adelino Sanchez Ramos da Silva
- Universidade de São Paulo (USP), Escola de Educação Física e Esporte de Ribeirão Preto (EEFERP), Ribeirão Preto, São Paulo, Brasil
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Aguiar e Silva MA, Vechetti-Junior IJ, Nascimento AFD, Furtado KS, Azevedo L, Ribeiro DA, Barbisan LF. Effects of swim training on liver carcinogenesis in male Wistar rats fed a low-fat or high-fat diet. Appl Physiol Nutr Metab 2012; 37:1101-9. [DOI: 10.1139/h2012-129] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The present study aimed to investigate the beneficial effects of swim training on the promotion–progression stages of rat liver carcinogenesis. Male Wistar rats were submitted to chemically induced liver carcinogenesis and allocated into 4 major groups, according their dietary regimen (16 weeks) and swim training of 5 days per week (8 weeks): 2 groups were fed low-fat diet (LFD, 6% fat) and trained or not trained and 2 groups were fed high-fat diet (HFD, 21% fat) and trained or not trained. At week 20, the animals were killed and liver samples were processed for histological analyses; immunohistochemical detection of persistent or remodeling preneoplastic lesions (pPNL and rPNL) expressing placental glutathione S-transferase (GST-P) enzyme; or proliferating cell nuclear antigen (PCNA), cleaved caspase-3, and bcl-2 protein levels by Western blotting or malonaldehyde (MDA) and total glutathione detection by HPLC. Overall analysis indicated that swim training reduced the body weight and body fat in both LFD and HFD groups, normalized total cholesterol levels in the HFD group while decreased the MDA levels, increased glutathione levels and both number of GST-P-positive pPNL and hepatocellular adenomas in LFD group. Also, a favorable balance in PCNA, cleaved caspase-3, and bcl-2 levels was detected in the liver from the LFD-trained group in relation to LFD-untrained group. The findings of this study indicate that the swim training protocol as a result of exercise postconditioning may attenuate liver carcinogenesis under an adequate dietary regimen with lowered fat intake.
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Affiliation(s)
- Marco Aurélio Aguiar e Silva
- Post-Graduation Program in General and Applied Biology, Institute of Biosciences, UNESP, Sao Paulo State University, Botucatu 18618-970, SP, Brazil
| | - Ivan José Vechetti-Junior
- Post-Graduation Program in General and Applied Biology, Institute of Biosciences, UNESP, Sao Paulo State University, Botucatu 18618-970, SP, Brazil
| | - André Ferreira do Nascimento
- Department of Clinical Medicine, School of Medicine, UNESP, Sao Paulo State University, 18618-970 Botucatu, SP, Brazil
| | - Kelly Silva Furtado
- School of Medicine, Department of Pathology, UNESP, Sao Paulo State University, 18618-970 Botucatu, SP, Brazil
| | - Luciana Azevedo
- Faculty of Nutrition, UNIFAL, Federal University of Alfenas, 37130-000, Alfenas, MG, Brazil
| | - Daniel Araki Ribeiro
- Department of Biosciences, UNIFESP, Federal University of Sao Paulo, 11060-001, Santos, SP, Brazil
| | - Luis Fernando Barbisan
- Department of Morphology, Institute of Biosciences, UNESP, Sao Paulo State University, 18618-970 Botucatu, SP, Brazil
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Hayward R, Hydock D, Gibson N, Greufe S, Bredahl E, Parry T. Tissue retention of doxorubicin and its effects on cardiac, smooth, and skeletal muscle function. J Physiol Biochem 2012; 69:177-87. [PMID: 22890792 DOI: 10.1007/s13105-012-0200-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Accepted: 07/19/2012] [Indexed: 11/29/2022]
Abstract
Cancer-related fatigue is a pervasive syndrome experienced by a majority of cancer patients undergoing treatment, and muscular dysfunction may be a key component in the development and progression of this syndrome. Doxorubicin (DOX) is a commonly used antineoplastic agent used in the treatment of many cancers. The purpose of this study was to determine the effect of DOX exposure on the function of cardiac, skeletal, and smooth muscle tissues and examine the role accumulation of DOX may play in this process. In these studies, rats were treated with DOX and measurements of cardiac, skeletal, and smooth muscle function were assessed 1, 3, and 5 days after exposure. All muscular tissues showed significant and severe dysfunction, yet there was heterogeneity both in the time course of dysfunction and in the accumulation of DOX. Cardiac and skeletal muscle exhibited a time-dependent progressive decline in function during the 5 days following DOX treatment. In contrast, vascular function showed a decline in function that could be characterized as rapid onset and was sustained for the duration of the 5-day observation period. DOX accumulation was greatest in cardiac tissue, yet all muscular tissues showed a similar degree of dysfunction. Our data suggest that in muscular tissues both DOX-dependent and DOX-independent mechanisms may be involved with the muscular dysfunction observed following DOX treatment. Furthermore, this study highlights the fact that dysfunction of skeletal and smooth muscle may be an underappreciated aspect of DOX toxicity and may be a key component of cancer-related fatigue in these patients.
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Affiliation(s)
- Reid Hayward
- School of Sport and Exercise Science, University of Northern Colorado, Greeley, CO 80639, USA.
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