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Okura K, Iwakura M, Kawagoshi A, Sugawara K, Takahashi H, Shioya T. Objective physical activity level is associated with rectus femoris muscle echo‐intensity in patients with chronic obstructive pulmonary disease. THE CLINICAL RESPIRATORY JOURNAL 2022; 16:572-580. [PMID: 35869592 PMCID: PMC9376137 DOI: 10.1111/crj.13528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 07/08/2022] [Accepted: 07/18/2022] [Indexed: 12/22/2022]
Abstract
Introduction Skeletal muscle dysfunction is one of the major extrapulmonary complications of chronic obstructive pulmonary disease (COPD). Some studies have reported a relationship between physical activity (PA) level and skeletal muscle quality assessed by echo‐intensity (EI) in healthy individuals but not in patients with COPD. Objectives The aim of this study is to investigate the relationships between PA level and both skeletal muscle EI and skeletal muscle mass in patients with COPD. Methods We employed a cross‐sectional design. Forty male outpatients with stable COPD were enrolled. Using B‐mode ultrasonography, we measured the rectus femoris muscle cross‐sectional area (RF‐CSA) and EI (RF‐EI). The RF‐CSA and RF‐EI were measured on frozen images using an electronic caliper and 8‐bit gray‐scale analysis, respectively. The objective PA level was determined by monitoring daily step counts and moderate‐to‐vigorous physical activity time (MVPA) with an activity monitor. A general regression model was used to assess the relationships between PA level and both RF‐CSA and RF‐EI. Age and body mass index (BMI) were adopted as confounding variables. Results Twenty‐five outpatients with stable COPD (age, 70 ± 7 years old; forced expiratory volume in 1 s, 55.0 ± 24.9% of predicted values) were finally enrolled in the present study. Even after adjusting for age and BMI, the daily step counts and MVPA were significantly associated with RF‐EI, and knee extensor force was associated with RF‐CSA. Conclusion The present study showed that PA level was associated with RF‐EI in patients with COPD. In addition, RF‐CSA was associated with knee extensor force. When assessing skeletal muscle using ultrasonography in patients with COPD, we should also assess EI.
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Affiliation(s)
- Kazuki Okura
- Division of Rehabilitation Akita University Hospital Akita City Japan
| | - Masahiro Iwakura
- Department of Rehabilitation Akita City Hospital Akita City Japan
| | | | - Keiyu Sugawara
- Department of Rehabilitation Akita City Hospital Akita City Japan
| | - Hitomi Takahashi
- Department of Physical Therapy, School of Health Sciences Fukushima Medical University Fukushima City Japan
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Zuberi FF, Bader N, Rasheed T, Zuberi BF. Association between insulin resistance and BMI with FEV 1 in non-hypoxemic COPD out-patients. CLINICAL RESPIRATORY JOURNAL 2021; 15:513-521. [PMID: 33497542 DOI: 10.1111/crj.13336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 05/26/2020] [Accepted: 01/21/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVES This study was conducted to determine the impact of insulin resistance using Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) score and BMI in non-hypoxemic out-patients with COPD on FEV1 using linear and polynomial regressions and to determine their correlation. METHODS COPD patients of both genders were included after informed consent. Fasting blood sugar and serum insulin were done to calculate HOMA-IR, which were segregated into two groups of ≥ 3 and < 3 labeled insulin resistance present and absent, these were compared with BMI. Patients were segregated into GOLD Grade 1-4 per GOLD Guidelines and compared with HOMA-IR and BMI. Curve and linear regressions, multivariate and univariate analysis of HOMA-IR with BMI, FVC, and FEV1 were done. RESULTS A total of 273 subjects were inducted after informed consent. There was a linear correlation between HOMA-IR and BMI (r2 0.498, P < 0.001) and nonlinear correlation between HOMA-IR and FEV1 (r2 0. 617, P < 0.001) which showed little evidence of association above FEV1 > 60 predicted, but a clear negative association below that. Significant increase in HOMA-IR was seen from GOLD-2 to 3 and from GOLD-3 to 4 classes. The impact of HOMA-IR on FEV1 was 49.9% (P < 0.001) on FVC was 43.7%. CONCLUSIONS The results indicate that there is a high prevalence of IR in non-hypoxemic COPD. A nonlinear association is present between FEV1 and HOMA-IR which is most evident with FEV1 <60% predicted.
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Affiliation(s)
- Faisal Faiyaz Zuberi
- Department of Pulmonology, Ojha Institute of Chest Disease, Dow University of Health Sciences, Karachi, Pakistan
| | - Nimrah Bader
- Department of Internal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Tazeen Rasheed
- Department of Medicine, Dow University of Health Sciences, Karachi, Pakistan
| | - Bader Faiyaz Zuberi
- Department of Medicine, Dow University of Health Sciences, Karachi, Pakistan
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Heo JE, Shim JS, Lee H, Kim HC. Association between the Thigh Muscle and Insulin Resistance According to Body Mass Index in Middle-Aged Korean Adults. Diabetes Metab J 2020; 44:446-457. [PMID: 32431102 PMCID: PMC7332329 DOI: 10.4093/dmj.2019.0110] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 10/07/2019] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND We examined the associations between thigh muscle area (TMA) and insulin resistance (IR) according to body mass index (BMI) in middle-aged Korean general population. METHODS TMA was measured using quantitative computed tomography and corrected by body weight (TMA/Wt) in 1,263 men, 788 premenopausal women, and 1,476 postmenopausal women all aged 30 to 64 years. The tertiles of TMA/Wt were calculated separately for men and for premenopausal and postmenopausal women. Homeostatic model assessment for insulin resistance (HOMA-IR) was performed using fasting blood glucose and insulin levels, and increased IR was defined according to sex-specific, top quartiles of HOMA-IR. Associations between the TMA/Wt tertiles and increased IR according to the BMI categories (<25 and ≥25 kg/m²) were assessed using multivariable logistic regression analysis. RESULTS In men with higher BMIs, but not in those with lower BMIs, the presence of an increased IR had significantly higher odds ratios in the lower TMA/Wt tertiles, even after adjustment for visceral fat area. However, in premenopausal and postmenopausal women, there was no significant inverse association between TMA/Wt tertiles and increased IR, regardless of BMI category. CONCLUSION Our findings suggest that the thigh muscle is inversely associated with IR in men, particularly in those with higher BMIs.
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Affiliation(s)
- Ji Eun Heo
- Department of Public Health, Yonsei University Graduate School, Seoul, Korea
- Cardiovascular and Metabolic Disease Etiology Research Center, Yonsei University College of Medicine, Seoul, Korea
| | - Jee Seon Shim
- Cardiovascular and Metabolic Disease Etiology Research Center, Yonsei University College of Medicine, Seoul, Korea
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Hokyou Lee
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Hyeon Chang Kim
- Cardiovascular and Metabolic Disease Etiology Research Center, Yonsei University College of Medicine, Seoul, Korea
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.
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Polkey MI, Praestgaard J, Berwick A, Franssen FME, Singh D, Steiner MC, Casaburi R, Tillmann HC, Lach-Trifilieff E, Roubenoff R, Rooks DS. Activin Type II Receptor Blockade for Treatment of Muscle Depletion in Chronic Obstructive Pulmonary Disease. A Randomized Trial. Am J Respir Crit Care Med 2019; 199:313-320. [PMID: 30095981 PMCID: PMC6363975 DOI: 10.1164/rccm.201802-0286oc] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 08/10/2018] [Indexed: 02/07/2023] Open
Abstract
RATIONALE Bimagrumab is a fully human monoclonal antibody that blocks the activin type II receptors, preventing the activity of myostatin and other negative skeletal muscle regulators. OBJECTIVES To assess the effects of bimagrumab on skeletal muscle mass and function in patients with chronic obstructive pulmonary disease (COPD) and reduced skeletal muscle mass. METHODS Sixty-seven patients with COPD (mean FEV1, 1.05 L [41.6% predicted]; aged 40-80 yr; body mass index < 20 kg/m2 or appendicular skeletal muscle mass index ≤ 7.25 [men] and ≤ 5.67 [women] kg/m2), received two doses of either bimagrumab 30 mg/kg intravenously (n = 33) or placebo (n = 34) (Weeks 0 and 8) over 24 weeks. MEASUREMENTS AND MAIN RESULTS We assessed changes in thigh muscle volume (cubic centimeters) as the primary endpoint along with 6-minute-walk distance (meters), safety, and tolerability. Fifty-five (82.1%) patients completed the study. Thigh muscle volume increased by Week 4 and remained increased at Week 24 in bimagrumab-treated patients, whereas no changes were observed with placebo (Week 4: +5.9% [SD, 3.4%] vs. 0.0% [3.3%], P < 0.001; Week 8: +7.0% [3.7%] vs. -0.7% [2.8%], P < 0.001; Week 16: +7.8% [5.1%] vs. -0.9% [4.5%], P < 0.001; Week 24: +5.0% [4.9%] vs. -1.3% [4.3%], P < 0.001). Over 24 weeks, 6-minute-walk distance did not increase significantly in either group. Adverse events in the bimagrumab group included muscle-related symptoms, diarrhea, and acne, most of which were mild in severity. CONCLUSIONS Blocking the action of negative muscle regulators through the activin type II receptors with bimagrumab treatment safely increased skeletal muscle mass but did not improve functional capacity in patients with COPD and low muscle mass. Clinical trial registered with www.clinicaltrials.gov (NCT01669174).
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Affiliation(s)
- Michael I. Polkey
- National Institute for Health Research Respiratory Biomedical Research Unit, Royal Brompton and Harefield National Health Service Foundation Trust and Imperial College London, London, United Kingdom
| | | | - Amy Berwick
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts
| | - Frits M. E. Franssen
- Department of Research and Education, CIRO, Center of Expertise for Chronic Organ Failure, Horn, the Netherlands
| | - Dave Singh
- Centre for Respiratory Medicine and Allergy, University of Manchester and the Medicines Evaluation Unit, University Hospital of South Manchester National Health Service Foundation Trust, Manchester, United Kingdom
| | - Michael C. Steiner
- Centre for Exercise and Rehabilitation Science, National Institute for Health Research Leicester Biomedical Research Centre, Respiratory, Glenfield Hospital, Leicester, United Kingdom
| | - Richard Casaburi
- Rehabilitation Clinical Trials Center, Los Angeles Biomedical Research Institute, Harbor-University of California Los Angeles Medical Center, Torrance, California; and
| | | | | | | | - Daniel S. Rooks
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts
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Understanding Symptoms of Muscle Tightness, Weakness, and Rigidity From a Nursing Perspective. Rehabil Nurs 2019; 44:271-281. [PMID: 30624311 DOI: 10.1097/rnj.0000000000000151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE This study examined the nature of muscle tightness from nurses' perspectives and explored how the symptoms of muscle tightness are communicated, managed, and differentiated from other conditions, such as muscle rigidity and muscle weakness. DESIGN An exploratory, descriptive qualitative design was used. METHODS Eight rehabilitation nurses described lexicons, care strategies, and communication for muscle tightness, weakness, and rigidity. FINDINGS Nurses used conflicting terms to describe muscle tightness, weakness, and rigidity. They identified medications and range of motion as the best strategies to manage muscle conditions. Nurses approach care holistically and do not differentiate care strategies that are based only on a symptoms lens. CONCLUSIONS Nurses were unable to clearly differentiate between muscle tightness and rigidity. CLINICAL RELEVANCE Nurses influence patients' choice of vocabulary; therefore, they must use simple but precise terminologies to educate their patients. Miscommunication between nurses and patients can lead to errors, which can have negative consequences.
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Pérez-Bautista O, Montaño M, Pérez-Padilla R, Zúñiga-Ramos J, Camacho-Priego M, Barrientos-Gutiérrez T, Buendía-Roldan I, Velasco-Torres Y, Ramos C. Women with COPD by biomass show different serum profile of adipokines, incretins, and peptide hormones than smokers. Respir Res 2018; 19:239. [PMID: 30514305 PMCID: PMC6280373 DOI: 10.1186/s12931-018-0943-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 11/19/2018] [Indexed: 01/27/2023] Open
Abstract
Background The main causes of COPD are tobacco smoking (COPD-TS) and biomass smoke exposure (COPD-BS). COPD-TS is known to induce changes in adipokines, incretins, and peptide hormones, frequent biomarkers of inflammation; however, it is unknown if similar changes occur in COPD-BS. Methods Clinical and physiological characteristics, and serum concentration of C-peptide, ghrelin, GIP, GLP-1, glucagon, insulin, leptin, PAI-1, resistin, and visfatin were measured in women with COPD-BS, COPD-TS, and healthy controls. Data were compared with one-way ANOVA and Tukey’s post hoc test; nonparametric were expressed as median (interquartile ranges), with Kruskal-Wallis and Dunn’s post-hoc test. Multivariate analysis, age, BMI, MS, and FEV1% pred with levels of inflammatory mediators in COPD women. Results FEV1% pred, FVC% pred, and FEV1/FVC ratio were decremented in COPD. In COPD-TS increased C-peptide, ghrelin, GIP, GLP-1, and leptin, and reduced glucagon, PAI-1, resistin, and visfatin. In COPD-BS enlarged ghrelin, insulin, leptin, and PAI-1 comparatively with COPD-TS and control, while C-peptide and GLP-1 relatively with controls; conversely, glucagon, and resistin were reduced. Multivariate analysis showed association of ghrelin, insulin, PAI-1, and visfatin with BS exposure. Conclusions women with COPD-BS have a distinct profile of adipokines, incretins, and peptide hormones, and specifically with ghrelin, insulin, PAI-1, and visfatin related to BS exposure.
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Affiliation(s)
- Oliver Pérez-Bautista
- Departamento de Investigación en Tabaquismo y EPOC, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Ciudad de México, Mexico
| | - Martha Montaño
- Departamento de Investigación en Fibrosis Pulmonar, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Talpan 4502, C.P. 14080, Ciudad de México, Mexico
| | - Rogelio Pérez-Padilla
- Departamento de Investigación en Tabaquismo y EPOC, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Ciudad de México, Mexico
| | - Joaquín Zúñiga-Ramos
- Laboratorio de Inmunobiología y Genética, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Ciudad de México, Mexico
| | - Mariana Camacho-Priego
- Departamento de Investigación en Tabaquismo y EPOC, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Ciudad de México, Mexico
| | - Tonatiuh Barrientos-Gutiérrez
- Centro de Investigación en Salud Poblacional, Instituto Nacional de Salud Pública (INSP), Cuernavaca, Morelos, Mexico
| | - Ivette Buendía-Roldan
- Departamento de Investigación en Fibrosis Pulmonar, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Talpan 4502, C.P. 14080, Ciudad de México, Mexico
| | - Yadira Velasco-Torres
- Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco (UAMX), Ciudad de México, Mexico
| | - Carlos Ramos
- Departamento de Investigación en Fibrosis Pulmonar, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas (INERICV), Talpan 4502, C.P. 14080, Ciudad de México, Mexico.
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Hashimoto Y, Okamura T, Hamaguchi M, Obora A, Kojima T, Fukui M. Impact of respiratory function on the progression from metabolically healthy non-overweight to metabolically abnormal phenotype. Nutr Metab Cardiovasc Dis 2018; 28:922-928. [PMID: 30057013 DOI: 10.1016/j.numecd.2018.05.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 05/30/2018] [Accepted: 05/31/2018] [Indexed: 11/25/2022]
Abstract
BACKGROUND AND AIMS Recent studies identified that metabolically abnormal non-overweight phenotype is a risk factor for cardiovascular diseases. However, only little is known about risk factors for the progression from metabolically healthy non-overweight (MHNO) to metabolically abnormal phenotype. In this study, we investigated the impact of respiratory function on the progression from MHNO to metabolically abnormal phenotype. METHODS AND RESULTS In this retrospective cohort study, 8949 (3872 men and 5077 women) individuals with MHNO, who participated in a health-checkup program from 2004 to 2015, were enrolled. Four metabolic factors (high-normal blood pressure or hypertension, impaired fasting glucose or diabetes, hypertriglyceridemia, and low HDL cholesterol concentration) were used to define metabolically healthy (less than two factors) or metabolically abnormal (two or more factors) phenotypes. Respiratory function was measured by spirometry. Over a median 4.0 years of follow-up, 927 participants progressed to metabolically abnormal phenotype. The percentage of FVC for predicted values (HR 0.98, 95% CI 0.93-1.03, p = 0.418) was not associated with the progression to metabolically abnormal phenotype after adjusting for covariates, including age, sex, alcohol consumption, exercise, smoking status, and body mass index, whereas the percentage of FEV1 for predicted values (%FEV1) (HR 0.87, 95% CI 0.84-0.91, p < 0.001) and the FEV1/FVC ratio (HR 0.86, 95% CI 0.78-0.95, p = 0.004) were associated with the progression to metabolically abnormal phenotype. CONCLUSION Decrease in respiratory function in terms of %FEV1 and the FEV1/FVC ratio is associated with the progression to metabolically abnormal phenotype in individuals with MHNO.
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Affiliation(s)
- Y Hashimoto
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto, Japan
| | - T Okamura
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto, Japan
| | - M Hamaguchi
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto, Japan; Department of Diabetology, Kameoka Municipal Hospital, Kameoka, Japan.
| | - A Obora
- Department of Gastroenterology, Murakami Memorial Hospital, Asahi University, Gifu, Japan
| | - T Kojima
- Department of Gastroenterology, Murakami Memorial Hospital, Asahi University, Gifu, Japan
| | - M Fukui
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto, Japan
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Machado FVC, Pitta F, Hernandes NA, Bertolini GL. Physiopathological relationship between chronic obstructive pulmonary disease and insulin resistance. Endocrine 2018; 61:17-22. [PMID: 29512058 DOI: 10.1007/s12020-018-1554-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 01/31/2018] [Indexed: 12/16/2022]
Abstract
PURPOSE Chronic obstructive pulmonary disease (COPD) is characterized by persistent and progressive airflow obstruction that is associated with an abnormal chronic inflammatory response in the airways and lungs to noxious particles. COPD often leads to physical inactivity and deconditioning that added to inappropriate/excessive inflammatory responses leads to systemic consequences. Studies have shown that metabolic syndrome and manifested diabetes are more frequent in COPD than in healthy subjects; a possible explanation is that different pathophysiological aspects of COPD can lead to insulin resistance. Thus, this mini-review aims to present the main studies suggesting a pathophysiological relationship between COPD and insulin resistance. METHODS A review of literature was conducted using PubMed and Web of Science databases with the aim of searching for studies supporting a relationship between COPD and insulin resistance. RESULTS A physiopathological relationship between COPD and insulin resistance was found, supported in part due to common risk factors presented by these two conditions, such as smoking and physical inactivity. Also, systemic effects (worsening of physical inactivity and sedentary behavior, inflammation and oxidative stress, body composition abnormalities) and the corticosteroid treatment of patients with COPD may play a role. CONCLUSION Patients with COPD should be screened for abnormalities in insulin sensitivity in order to reduce morbidity and improve health status in this population.
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Affiliation(s)
- Felipe Vilaça Cavallari Machado
- Department of Physiotherapy, Laboratory of Research in Respiratory Physiotherapy (LFIP), State University of Londrina (UEL), Londrina, Paraná, Brazil
| | - Fabio Pitta
- Department of Physiotherapy, Laboratory of Research in Respiratory Physiotherapy (LFIP), State University of Londrina (UEL), Londrina, Paraná, Brazil
| | - Nidia Aparecida Hernandes
- Department of Physiotherapy, Laboratory of Research in Respiratory Physiotherapy (LFIP), State University of Londrina (UEL), Londrina, Paraná, Brazil
| | - Gisele Lopes Bertolini
- Department of Physiological Sciences, State University of Londrina (UEL), Londrina, Paraná, Brazil.
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Gan Z, Powell FL, Zambon AC, Buchholz KS, Fu Z, Ocorr K, Bodmer R, Moya EA, Stowe JC, Haddad GG, McCulloch AD. Transcriptomic analysis identifies a role of PI3K-Akt signalling in the responses of skeletal muscle to acute hypoxia in vivo. J Physiol 2017; 595:5797-5813. [PMID: 28688178 PMCID: PMC5577531 DOI: 10.1113/jp274556] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 06/19/2017] [Indexed: 01/13/2023] Open
Abstract
KEY POINTS Changes in gene expression that occur within hours of exposure to hypoxia in in vivo skeletal muscles remain unexplored. Two hours of hypoxia caused significant down-regulation of extracellular matrix genes followed by a shift at 6 h to altered expression of genes associated with the nuclear lumen while respiratory and blood gases were stabilized. Enrichment analysis of mRNAs classified by stability rates suggests an attenuation of post-transcriptional regulation within hours of hypoxic exposure, where PI3K-Akt signalling was suggested to have a nodal role by pathway analysis. Experimental measurements and bioinformatic analyses suggested that the dephosphorylation of Akt after 2 h of hypoxic exposure might deactivate RNA-binding protein BRF1, hence resulting in the selective degradation of mRNAs. ABSTRACT The effects of acute hypoxia have been widely studied, but there are few studies of transcriptional responses to hours of hypoxia in vivo, especially in hypoxia-tolerant tissues like skeletal muscles. We used RNA-seq to analyse gene expression in plantaris muscles while monitoring respiration, arterial blood gases, and blood glucose in mice exposed to 8% O2 for 2 or 6 h. Rapid decreases in blood gases and a slower reduction in blood glucose suggest stress, which was accompanied by widespread changes in gene expression. Early down-regulation of genes associated with the extracellular matrix was followed by a shift to genes associated with the nuclear lumen. Most of the early down-regulated genes had mRNA half-lives longer than 2 h, suggesting a role for post-transcriptional regulation. These transcriptional changes were enriched in signalling pathways in which the PI3K-Akt signalling pathway was identified as a hub. Our analyses indicated that gene targets of PI3K-Akt but not HIF were enriched in early transcriptional responses to hypoxia. Among the PI3K-Akt targets, 75% could be explained by a deactivation of adenylate-uridylate-rich element (ARE)-binding protein BRF1, a target of PI3K-Akt. Consistent decreases in the phosphorylation of Akt and BRF1 were experimentally confirmed following 2 h of hypoxia. These results suggest that the PI3K-Akt signalling pathway might play a role in responses induced by acute hypoxia in skeletal muscles, partially through the dephosphorylation of ARE-binding protein BRF1.
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Affiliation(s)
- Zhuohui Gan
- School of Basic Medical SciencesWenzhou Medical UniversityWenzhou325035ZhejiangChina
- Department of BioengineeringUniversity of California San DiegoLa JollaCA92093USA
| | - Frank L. Powell
- Department of MedicineUniversity of California San DiegoLa JollaCA92093USA
| | - Alexander C. Zambon
- Department of Biopharmaceutical SciencesKeck Graduate InstituteClaremontCA91711USA
| | - Kyle S. Buchholz
- Department of BioengineeringUniversity of California San DiegoLa JollaCA92093USA
| | - Zhenxing Fu
- Department of MedicineUniversity of California San DiegoLa JollaCA92093USA
| | - Karen Ocorr
- Development, Aging and Regeneration ProgramSanford Burnham Prebys Medical Discovery InstituteLa JollaCA92037USA
| | - Rolf Bodmer
- Development, Aging and Regeneration ProgramSanford Burnham Prebys Medical Discovery InstituteLa JollaCA92037USA
| | - Esteban A. Moya
- Department of MedicineUniversity of California San DiegoLa JollaCA92093USA
| | - Jennifer C. Stowe
- Department of BioengineeringUniversity of California San DiegoLa JollaCA92093USA
| | - Gabriel G. Haddad
- Department of PediatricsUniversity of California San DiegoLa JollaCA92093USA
- Department of NeurosciencesUniversity of California San DiegoLa JollaCA92093USA
- Rady Children's Hospital San Diego3020 Children's WaySan DiegoCA92123USA
| | - Andrew D. McCulloch
- Department of BioengineeringUniversity of California San DiegoLa JollaCA92093USA
- Department of MedicineUniversity of California San DiegoLa JollaCA92093USA
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Lim TK, Ko FWS, Benton MJ, Berge MVD, Mak J. Year in review 2016: Chronic obstructive pulmonary disease and asthma. Respirology 2017; 22:820-828. [PMID: 28371172 DOI: 10.1111/resp.13037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 03/06/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Tow Keang Lim
- Department of Medicine, National University Hospital, Singapore
| | - Fanny W S Ko
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China
| | - Melissa J Benton
- Helen and Arthur E. Johnson Beth-El College of Nursing and Health Sciences, University of Colorado, Colorado Springs, Colorado, USA
| | - Maarten Van den Berge
- Department of Pulmonology, University Medical Center Groningen, Groningen, The Netherlands
| | - Judith Mak
- Department of Medicine, Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong Kong, Hong Kong.,Department of Pharmacology and Pharmacy, Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong Kong, Hong Kong
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Cebron Lipovec N, Schols AMWJ, van den Borst B, Beijers RJHCG, Kosten T, Omersa D, Lainscak M. Sarcopenia in Advanced COPD Affects Cardiometabolic Risk Reduction by Short-Term High-intensity Pulmonary Rehabilitation. J Am Med Dir Assoc 2016; 17:814-20. [PMID: 27321867 DOI: 10.1016/j.jamda.2016.05.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 05/02/2016] [Accepted: 05/02/2016] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Sarcopenia is common in chronic obstructive pulmonary disease (COPD) and may contribute to increased cardiometabolic risk. Interventions to reduce cardiometabolic risk in advanced COPD have been scarcely studied. We have investigated the cardiometabolic effect of a short-term high-intensity rehabilitation program in sarcopenic and nonsarcopenic patients with advanced COPD. DESIGN Prospective observational study. SETTING Inpatient 4-week short-term high-intensity pulmonary rehabilitation program at the University Clinic Golnik, Slovenia. PARTICIPANTS 112 stable COPD patients (66 ± 8 years, 85% GOLD III/IV, 66% men). MEASUREMENTS Blood biomarkers were assessed at baseline and after rehabilitation. Sarcopenia was assessed at baseline (skeletal muscle index <7.23 kg/m(2) for men and <5.67 kg/m(2) for women, as measured by whole-body dual energy X-ray absorptiometry. Insulin resistance (IR) was defined as homeostasis model assessment of insulin resistance (HOMA-IR) above 2.5. RESULTS IR and sarcopenia were detected in 59% and 55% of patients, respectively. In contrast to sarcopenic patients, rehabilitation decreased HOMA-IR (2.8 to 1.9, P = .031), fat mass index (10.1 to 9.7 kg/m(2), P = .013), waist circumference (103 to 101 cm, P = .002), and low-density lipoprotein cholesterol (3.2 to 3.0 mmol/L, P = .034) in nonsarcopenic patients. A decrease in total cholesterol levels was observed in both groups. CONCLUSIONS Sarcopenia affects the modification of cardiometabolic risk markers by short-term high-intensity pulmonary rehabilitation in advanced COPD patients.
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Affiliation(s)
- Nanca Cebron Lipovec
- University Clinic of Pulmonary and Allergic Diseases Golnik, Golnik, Slovenia; NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Annemie M W J Schols
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Bram van den Borst
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Rosanne J H C G Beijers
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Tatjana Kosten
- University Clinic of Pulmonary and Allergic Diseases Golnik, Golnik, Slovenia
| | - Daniel Omersa
- National Institute of Public Health, Ljubljana, Slovenia
| | - Mitja Lainscak
- Department of Cardiology and Department of Research and Education, General Hospital, Celje, Slovenia; Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
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