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Plaza-Florido A, Liem RI, Haddad F, Radom-Aizik S. Whole-blood transcriptome analysis reveals distinct gene expression signatures in paediatric patients with sickle cell anaemia before and after exercise. Br J Haematol 2024; 205:320-328. [PMID: 38768976 PMCID: PMC11245363 DOI: 10.1111/bjh.19533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 05/07/2024] [Indexed: 05/22/2024]
Abstract
Sickle cell anaemia (SCA) patients display elevated levels of circulating pro-inflammatory cytokines and endothelial activation markers compared to healthy peers. The impact of exercise on the pro-inflammatory state in SCA remains unclear. This study aimed to characterize the whole-blood transcriptome profile in response to an acute bout of exercise in paediatric SCA patients. Twenty-three SCA participants (13 ± 3 years, 52% girls) and 17 healthy controls (14 ± 3 years, 29% girls) performed eight 2-min bouts of cycle ergometry interspersed with 1-min rest intervals. Whole-blood transcriptome profile (RNA-seq) was performed before and after exercise. At baseline, gene pathways associated with gas transport in erythrocytes were up-regulated in SCA patients compared to controls. Following exercise, gene pathways associated with innate immunity were altered in both groups. Interaction analyses revealed 160 annotated genes (101 up- and 59 down-regulated) that differentially altered by exercise in SCA patients. Moreover, genes that exhibited a blunted response to exercise in SCA patients were enriched in the IL-17 signalling pathway, suggesting an impaired innate immune response to exercise. This data will contribute to the development of evidence-based exercise prescription guidelines for this patient population.
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Affiliation(s)
- Abel Plaza-Florido
- Department of Pediatrics, School of Medicine, Pediatric Exercise and Genomics Research Center, University of California Irvine, Irvine, California, USA
| | - Robert I Liem
- Division of Hematology, Oncology & Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Fadia Haddad
- Department of Pediatrics, School of Medicine, Pediatric Exercise and Genomics Research Center, University of California Irvine, Irvine, California, USA
| | - Shlomit Radom-Aizik
- Department of Pediatrics, School of Medicine, Pediatric Exercise and Genomics Research Center, University of California Irvine, Irvine, California, USA
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2
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Exercise Capacity and Biomarkers Among Children and Adolescents With Sickle Cell Disease. Pediatr Exerc Sci 2022; 35:84-91. [PMID: 35894886 DOI: 10.1123/pes.2021-0188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 06/02/2022] [Accepted: 06/16/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND Sickle cell disease is the most common genetic hemoglobinopathy globally and systemically affects body functioning, decreasing exercise capacity. OBJECTIVE To assess exercise capacity through the 6-minute walk test (6MWT) and biomarkers in children and adolescents with sickle cell disease. MATERIALS AND METHODS Cross-sectional study involving 20 children and adolescents from Brazil. Demographic and socioeconomic data were obtained. Baseline measurements included biomarkers (red blood cells, hemoglobin, hematocrit, white blood cells, platelets, reticulocytes, lactate dehydrogenase, creatine phosphokinase, C-reactive protein, interleukin 6, and fetal hemoglobin). The following data were obtained before, during, and after the 6MWT: heart rate, blood pressure, and peripheral oxygen saturation. RESULTS Eighteen children and adolescents ages 5-14 years old were analyzed, 61.1% boys, 100% black or brown, and 61.1% in primary education, with low household income. The average distance walked in 6MWT was 463.8 (137.7) m, significantly less than the predicted value (P < .001). The distance of 6MWT was associated positively with age (P = .042) and inversely with reticulocyte count (P = .42) and interleukin 6 (P = .00). Age modified the effect of interleukin 6 in younger children (P = .038). CONCLUSION Our findings suggest increased baseline levels of biomarkers of hemolysis and inflammation impact on 6MWT performance.
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Alagbe AE, Domingos IF, Adekile AD, Blotta MHSL, Santos MNN. Anti-inflammatory cytokines in sickle cell disease. Mol Biol Rep 2022; 49:2433-2442. [PMID: 35000064 DOI: 10.1007/s11033-021-07009-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 11/23/2021] [Indexed: 12/15/2022]
Abstract
Sickle cell disease (SCD) is a well-studied monogenetic disease with an established chronic inflammatory component. The paradigm shift towards inflammation has made the pathophysiology of SCD even more complex. Studies have shown that an imbalance between the pro-inflammatory and anti-inflammatory cytokines in SCD exists; however, the reports are skewed toward the pro-inflammatory mediators. We enumerate recent in vitro and in vivo studies on anti-inflammatory cytokines in SCD patients, and discuss the biology of anti-inflammatory cytokines including the already reported IL-2, TGF-β, and IL-10 as well as the recently discovered IL-27, IL-35 and IL-37. This review will improve the understanding of the pathophysiology of SCD and aid in the search of new therapeutic options for patients with SCD.
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Affiliation(s)
- Adekunle E Alagbe
- Department of Clinical Pathology, School of Medical Sciences, State University of Campinas - UNICAMP, Campinas, São Paulo, Brazil
| | - Igor F Domingos
- Department of Clinical and Toxicological Analysis, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Adekunle D Adekile
- Department of Pediatrics, Faculty of Medicine, Kuwait University, Kuwait City, Kuwait
| | - Maria H S L Blotta
- Department of Clinical Pathology, School of Medical Sciences, State University of Campinas - UNICAMP, Campinas, São Paulo, Brazil
| | - Magnun N N Santos
- Department of Clinical Pathology, School of Medical Sciences, State University of Campinas - UNICAMP, Campinas, São Paulo, Brazil.
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Marchese V, Rock K, Harpold A, Salazar A, Williams M, Shipper AG. Physical Impairment and Function in Children and Adolescents With Sickle Cell Disease: A Systematic Review. Arch Phys Med Rehabil 2021; 103:1144-1167.e2. [PMID: 34592159 DOI: 10.1016/j.apmr.2021.08.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/17/2021] [Accepted: 08/30/2021] [Indexed: 11/02/2022]
Abstract
OBJECTIVE To examine physical impairments and physical function in children and adolescents with sickle cell disease (SCD). DATA SOURCES PubMed, Embase (embase.com), Cumulative Index to Nursing and Allied Health (EBSCO), Cochrane Central Register of Controlled Trials (Wiley), and Dissertations and Theses (ProQuest) were searched from January 1, 1990, to September 25, 2020. References retrieved were required to include a term for SCD and a term for physical impairments or physical function. Results were limited to articles with children and adolescents and in the English language. STUDY SELECTION A total of 3054 nonduplicate articles were independently screened by 2 reviewers, resulting in 240 articles for full-text review. The full-text review, performed by 2 independent reviewers, resulted in 67 articles. DATA EXTRACTION Data were extracted from each full text to a custom Excel document by a single reviewer and were verified by a secondary reviewer. DATA SYNTHESIS The studies identified in this systematic review offer evidence that children and adolescents with SCD demonstrate physical impairments and physical function limitations compared with control participants as noted by varying percentages in deficits up to 19%-58% in muscle and bone composition and/or symptoms, muscle strength, cardiopulmonary function, motor performance, physical activity, and physical function domains of quality of life questionnaires. CONCLUSIONS Children and adolescents with SCD present with physical impairments and physical function limitations. Scientists and clinicians should consider developing collaborative standards to define and objectively measure physical impairment and function in this population to comprehensively examine the underlying factors that contribute to physical impairments and function.
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Affiliation(s)
- Victoria Marchese
- Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD.
| | - Kelly Rock
- Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD
| | - Andria Harpold
- Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD
| | - Abigail Salazar
- Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD
| | - Mary Williams
- Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD
| | - Andrea G Shipper
- Health Sciences and Human Services Library, University of Maryland, Baltimore, Baltimore, MD
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Smith KN, Baynard T, Fischbach PS, Hankins JS, Hsu LL, Murphy PM, Ness KK, Radom-Aizik S, Tang A, Liem RI. Safety of maximal cardiopulmonary exercise testing in individuals with sickle cell disease: a systematic review. Br J Sports Med 2021; 56:764-769. [PMID: 34285054 DOI: 10.1136/bjsports-2021-104450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2021] [Indexed: 11/04/2022]
Abstract
OBJECTIVE We evaluated the safety of maximal cardiopulmonary exercise testing (CPET) in individuals with sickle cell disease (SCD). Maximal CPET using gas exchange analysis is the gold standard for measuring cardiopulmonary fitness in the laboratory, yet its safety in the SCD population is unclear. DESIGN Systematic review. DATA SOURCES Systematic search of Medline (PubMed), EMBASE, Cochrane, ClinicalTrials.gov and professional society websites for all published studies and abstracts through December 2020. ELIGIBILITY CRITERIA FOR SELECTING STUDIES Two reviewers independently extracted data of interest from studies that assessed safety outcomes of maximal CPET in children and adults with SCD. A modified version of the Newcastle-Ottawa Scale was used to assess for risk of bias in studies included. RESULTS In total, 24 studies met inclusion/exclusion criteria. Adverse events were reported separately or as part of study results in 36 (3.8%) of 939 participants with SCD undergoing maximal CPET in studies included. Most adverse events were related to transient ischaemic changes on ECG monitoring or oxygen desaturation during testing, which did not result in arrhythmias or other complications. Only 4 (0.43%) of 939 participants experienced pain events due to maximal CPET. CONCLUSION Maximal CPET appears to be a safe testing modality in children and adults with SCD and can be used to better understand the physiological basis of reduced exercise capacity and guide exercise prescription in this population. Some studies did not focus on reporting adverse events related to exercise testing or failed to mention safety monitoring, which contributed to risk of bias.
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Affiliation(s)
- Kellsey N Smith
- Division of Hematology, Oncology & Stem Cell Transplant, Ann and Robert H Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Tracy Baynard
- Integrative Physiology Laboratory, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Peter S Fischbach
- Sibley Heart Center, Children's Healthcare of Atlanta, Atlanta, Georgia, USA
| | - Jane S Hankins
- Department of Hematology, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Lewis L Hsu
- Division of Pediatric Hematology/Oncology, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Peggy M Murphy
- Division of Hematology, Oncology & Stem Cell Transplant, Ann and Robert H Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Kiri K Ness
- Department of Epidemiology and Cancer Control, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Shlomit Radom-Aizik
- Pediatric Exercise and Genomics Research Center, University of California Irvine, Irvine, California, USA
| | - Amy Tang
- Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, Georgia, USA
| | - Robert I Liem
- Division of Hematology, Oncology & Stem Cell Transplant, Ann and Robert H Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
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Jan Z, Drab M, Drobne D, Bedina Zavec A, Benčina M, Drasler B, Hočevar M, Krek JL, Pađen L, Pajnič M, Repar N, Šimunič B, Štukelj R, Kralj-Iglič V. Decrease in Cellular Nanovesicles Concentration in Blood of Athletes More Than 15 Hours After Marathon. Int J Nanomedicine 2021; 16:443-456. [PMID: 33505159 PMCID: PMC7829122 DOI: 10.2147/ijn.s282200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 11/12/2020] [Indexed: 12/30/2022] Open
Abstract
Introduction Cellular nanovesicles (CNVs), that are shed from cells, have been recognized as promising indicators of health status. We analyzed the effect of long-distance running on concentration of CNVs, along with some standard blood parameters, in 27 athletes two days before and >15 hours after physical effort. Methods CNVs were isolated by repetitive centrifugation and washing of samples, and assessed by flow cytometry. Cholinesterase (ChE) and glutathione S-transferase (GST) activity were measured spectrophotometrically. Interleukin 6 (IL-6) and tumor necrosis factor-α (TNF-α) concentrations were measured using enzyme-linked immunosorbent assay (ELISA). C-reactive protein (CRP) was measured with immunoturbidimetric determination and lipidogram parameters were measured by enzymatic colorimetric assay. Flow cytometry was used for blood cell count and mean platelet volume (MPV) measurement. Results More than 15 hours after physical effort a decrease was found in CNVs' concentration in isolates from blood (46%; p<0.05), in ChE activity in whole blood (47%; p<0.001), in plasma (34%; p<0.01), and in erythrocyte suspension (54%; p<0.001), as well as in GST activity in erythrocyte suspension (16%; p<0.01) and in IL-6 concentration in plasma (63%; p<0.05). We found no change in GST activity in plasma and in TNF-α concentration in plasma. Correlations (>0.8; p<0.001) between CNVs' concentration and ChE activity, and GST activity, respectively, in erythrocyte suspension were found. Conclusion We found that >15 hours post-physical effort, CNVs' concentration was below the initial value, concomitant with other measured parameters: ChE and GST activity as well as IL-6 concentration, indicating a favorable effect of physical effort on health status. CNVs' concentration and ChE activity in isolates from peripheral blood proved to have potential as indicators of the response of the human body to inflammation after physical effort. Physical activity should be considered as an important factor in preparation of subjects for blood sampling in procedures focusing on CNV-containing diagnostic and therapeutic compounds.
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Affiliation(s)
- Zala Jan
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - Mitja Drab
- Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - Damjana Drobne
- Nanobiology and Nanotoxicology Group, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Apolonija Bedina Zavec
- Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Ljubljana, Slovenia
| | - Mojca Benčina
- Department of Synthetic Biology and Immunology, National Institute of Chemistry, Ljubljana, Slovenia
| | - Barbara Drasler
- Nanobiology and Nanotoxicology Group, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Matej Hočevar
- Physics and Chemistry of Materials, Laboratory of Surface Engineering and Applied Surface Science, The Institute of Metals and Technology, Ljubljana, Slovenia
| | - Judita Lea Krek
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - Ljubiša Pađen
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - Manca Pajnič
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - Neža Repar
- Nanobiology and Nanotoxicology Group, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Boštjan Šimunič
- Institute for Kinesiology Research, Science and Research Centre Koper, Koper, Slovenia
| | - Roman Štukelj
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - Veronika Kralj-Iglič
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
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7
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Cooper DM, Radom-Aizik S. Exercise-associated prevention of adult cardiovascular disease in children and adolescents: monocytes, molecular mechanisms, and a call for discovery. Pediatr Res 2020; 87:309-318. [PMID: 31649340 PMCID: PMC11177628 DOI: 10.1038/s41390-019-0581-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 08/07/2019] [Accepted: 08/15/2019] [Indexed: 12/28/2022]
Abstract
Atherosclerosis originates in childhood and adolescence. The goal of this review is to highlight how exercise and physical activity during childhood and adolescence, critical periods of growth and development, can prevent adult cardiovascular disease (CVD), particularly through molecular mechanisms of monocytes, a key cell of the innate immune system. Monocytes are heterogeneous and pluripotential cells that can, paradoxically, play a role in both the instigation and prevention of atherosclerosis. Recent discoveries in young adults reveal that brief exercise affects monocyte gene pathways promoting a cell phenotype that patrols the vascular system and repairs injuries. Concurrently, exercise inhibits pro-inflammatory monocytes, cells that contribute to vascular damage and plaque formation. Because CVD is typically asymptomatic in youth, minimally invasive techniques must be honed to study the subtle anatomic and physiologic evidence of vascular dysfunction. Exercise gas exchange and heart rate measures can be combined with ultrasound assessments of vascular anatomy and reactivity, and near-infrared spectroscopy to quantify impaired O2 transport that is often hidden at rest. Combined with functional, transcriptomic, and epigenetic monocyte expression and measures of monocyte-endothelium interaction, molecular mechanisms of early CVD can be formulated, and then translated into effective physical activity-based strategies in youth to prevent adult-onset CVD.
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Affiliation(s)
- Dan M Cooper
- Pediatric Exercise and Genomics Research Center, University of California Irvine School of Medicine, Pediatrics, Irvine, CA, USA.
| | - Shlomit Radom-Aizik
- Pediatric Exercise and Genomics Research Center, University of California Irvine School of Medicine, Pediatrics, Irvine, CA, USA
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8
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Cooper DM, Liem RI. Translating exercise benefits in sickle cell disease. Blood 2019; 134:2227-2229. [PMID: 31856272 PMCID: PMC8212353 DOI: 10.1182/blood.2019003651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Robert I Liem
- Ann & Robert H. Lurie Children's Hospital of Chicago
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9
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Impact of A Six Week Training Program on Ventilatory Efficiency, Red Blood Cell Rheological Parameters and Red Blood Cell Nitric Oxide Signaling in Young Sickle Cell Anemia Patients: A Pilot Study. J Clin Med 2019; 8:jcm8122155. [PMID: 31817545 PMCID: PMC6947402 DOI: 10.3390/jcm8122155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 12/03/2019] [Accepted: 12/04/2019] [Indexed: 01/06/2023] Open
Abstract
Patients with sickle cell anemia (SCA) show impaired ventilatory efficiency, altered blood rheology, high levels of oxidative/nitrosative stress and enhanced hemolysis with large amounts of circulating free hemoglobin, which reduces nitric oxide (NO) bioavailability. The aim of the study was to investigate whether physical exercise could improve these physiological and biological markers described to contribute to SCA pathophysiology. Twelve SCA patients participated in a controlled six weeks training program with moderate volume (two sessions per week with 15–30 min duration per session) and intensity (70% of the first ventilatory threshold). Parameters were compared before (T0) and after (T1) training. Daily activities were examined by a questionnaire at T0 and one year after the end of T1. Results revealed improved ventilatory efficiency, reduced nitrosative stress, reduced plasma free hemoglobin concentration, increased plasma nitrite levels and altered rheology at T1 while no effect was observed for exercise performance parameters or hematological profile. Red blood cell (RBC) NO parameters indicate increased NO bioavailability which did not affect RBC deformability. Participants increased their daily life activity level. The data from this pilot study concludes that even low intensity activities are feasible and could be beneficial for the health of SCA patients.
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Kato GJ. Exercise training: a prescription for sickle-cell disease? LANCET HAEMATOLOGY 2019; 5:e502-e503. [PMID: 30389033 DOI: 10.1016/s2352-3026(18)30178-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 10/01/2018] [Indexed: 01/14/2023]
Affiliation(s)
- Gregory J Kato
- Division of Hematology-Oncology and the Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
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11
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Liem RI. Balancing exercise risk and benefits: lessons learned from sickle cell trait and sickle cell anemia. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2018; 2018:418-425. [PMID: 30504341 PMCID: PMC6245992 DOI: 10.1182/asheducation-2018.1.418] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Development of exercise guidelines for individuals with sickle cell trait (SCT) and sickle cell anemia (SCA) is hampered by the need to weigh the benefits against risks of exercise in these populations. In SCT, concern for exercise collapse associated with sickle cell trait has resulted in controversial screening of student athletes for SCT. In SCA, there exists unsubstantiated concerns that high-intensity exercise may result in pain and other complications. In both, finding the "right dose" of exercise remains a challenge for patients and their providers. Despite assumptions that factors predisposing to adverse events from high-intensity exercise overlap in SCT and SCA, the issues that frame our understanding of exercise-related harms in both are distinct. This review will compare issues that affect the risk-benefit balance of exercise in SCT and SCA through these key questions: (1) What is the evidence that high-intensity exercise is associated with harm? (2) What are the pathophysiologic mechanisms that could predispose to harm? (3) What are the preventive strategies that may reduce risk? and (4) Why do we need to consider the benefits of exercise in this debate? Addressing these knowledge gaps is essential for developing an evidence-based exercise prescription for these patient populations.
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Affiliation(s)
- Robert I Liem
- Hematology, Oncology and Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL; and Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL
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Abstract
The primary β-globin gene mutation that causes sickle cell disease (SCD) has significant pathophysiological consequences that result in hemolytic events and the induction of the inflammatory processes that ultimately lead to vaso-occlusion. In addition to their role in the initiation of the acute painful vaso-occlusive episodes that are characteristic of SCD, inflammatory processes are also key components of many of the complications of the disease including autosplenectomy, acute chest syndrome, pulmonary hypertension, leg ulcers, nephropathy and stroke. We, herein, discuss the events that trigger inflammation in the disease, as well as the mechanisms, inflammatory molecules and cells that propagate these inflammatory processes. Given the central role that inflammation plays in SCD pathophysiology, many of the therapeutic approaches currently under pre-clinical and clinical development for the treatment of SCD endeavor to counter aspects or specific molecules of these inflammatory processes and it is possible that, in the future, we will see anti-inflammatory drugs being used either together with, or in place of, hydroxyurea in those SCD patients for whom hematopoietic stem cell transplants and evolving gene therapies are not a viable option.
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Affiliation(s)
- Nicola Conran
- Hematology Center, University of Campinas - UNICAMP, Cidade Universitária, Campinas-SP, Brazil
| | - John D Belcher
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, MN, USA
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13
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Charrin E, Dubé JJ, Connes P, Pialoux V, Ghosh S, Faes C, Ofori-Acquah SF, Martin C. Moderate exercise training decreases inflammation in transgenic sickle cell mice. Blood Cells Mol Dis 2018. [DOI: 10.1016/j.bcmd.2017.06.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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Liem RI, Akinosun M, Muntz DS, Thompson AA. Feasibility and safety of home exercise training in children with sickle cell anemia. Pediatr Blood Cancer 2017; 64. [PMID: 28598539 DOI: 10.1002/pbc.26671] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 05/09/2017] [Accepted: 05/11/2017] [Indexed: 11/09/2022]
Abstract
Exercise guidelines do not exist for individuals with sickle cell anemia (SCA) despite the impact of disease-related complications on physical functioning. Thirteen subjects (mean 15.1 ± 2.8 years old) with SCA were prescribed three exercise sessions/week for 12 weeks on a stationary bicycle placed at home. In total, 77% of subjects completed 89% of prescribed sessions without exercise-related adverse events, thus meeting feasibility and safety criteria. Adherence to prescribed duration and target heart rate during training decreased during the second half of the study. Future trials are warranted to further evaluate training benefits associated with regular exercise in children with SCA.
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Affiliation(s)
- Robert I Liem
- Division of Hematology, Oncology & Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois
| | - Moriyike Akinosun
- Division of Hematology, Oncology & Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois
| | - Devin S Muntz
- Division of Hematology, Oncology & Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois
| | - Alexis A Thompson
- Division of Hematology, Oncology & Stem Cell Transplant, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois
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15
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Chatel B, Messonnier LA, Hourdé C, Vilmen C, Bernard M, Bendahan D. Moderate and intense muscular exercises induce marked intramyocellular metabolic acidosis in sickle cell disease mice. J Appl Physiol (1985) 2017; 122:1362-1369. [DOI: 10.1152/japplphysiol.01099.2016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 03/02/2017] [Accepted: 03/02/2017] [Indexed: 11/22/2022] Open
Abstract
Sickle cell disease (SCD) is associated with an impaired oxygen delivery to skeletal muscle that could alter ATP production processes. The present study aimed to determine the effects of sickle hemoglobin (HbS) on muscle pH homeostasis in response to exercise in homozygous (HbSS, n = 9) and heterozygous (HbAS, n = 10) SCD (Townes) mice in comparison to control (HbAA, n = 10) littermates. Magnetic resonance spectroscopy of phosphorus 31 enabled to measure intramuscular pH and phosphocreatine (PCr) concentration during rest-stimulation-recovery protocols at two different intensities. Maximal activity of some enzymes involved in muscle energetics and content of proteins involved in pH regulation were also investigated. HbSS mice presented a more pronounced exercise-induced intramuscular acidosis, whatever the intensity of exercise. Moreover, the depletion of PCr was also exacerbated in HbSS mice in response to intense exercise as compared with both HbAA and HbAS mice ( P < 0.01). While no difference was observed concerning proteins involved in muscle pH regulation, the activity of enolase (a glycolytic enzyme) was higher in both HbSS and HbAS mice as compared with controls ( P < 0.05). Interestingly, HbAS mice presented also metabolic impairments as compared with their control counterparts. This study has identified for the first time an exacerbated exercise-induced intramuscular acidosis in SCD mice.NEW & NOTEWORTHY The main finding of the present study was that the exercise-induced intramuscular acidosis was systematically more pronounced in sickle cell disease (SCD) mice as compared with their control counterparts. This result is important since it has been demonstrated in vitro that acidosis can trigger hemoglobin polymerization. From that point of view, our results tend to support the idea that high-intensity exercise may increase the risk of hemoglobin polymerization in SCD.
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Affiliation(s)
| | - Laurent A. Messonnier
- Aix-Marseille Univ, CNRS, CRMBM, Marseille, France; and
- Université Savoie Mont Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, Chambéry, France
| | - Christophe Hourdé
- Université Savoie Mont Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, Chambéry, France
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Pediatric Exercise Testing: Value and Implications of Peak Oxygen Uptake. CHILDREN-BASEL 2017; 4:children4010006. [PMID: 28125022 PMCID: PMC5296667 DOI: 10.3390/children4010006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 12/15/2016] [Accepted: 01/17/2017] [Indexed: 01/26/2023]
Abstract
Peak oxygen uptake (peakV˙O2) measured by clinical exercise testing is the benchmark for aerobic fitness. Aerobic fitness, estimated from maximal treadmill exercise, is a predictor of mortality in adults. PeakV˙O2 was shown to predict longevity in patients aged 7–35 years with cystic fibrosis over 25 years ago. A surge of exercise studies in young adults with congenital heart disease over the past decade has revealed significant prognostic information. Three years ago, the first clinical trial in children with pulmonary arterial hypertension used peakV˙O2 as an endpoint that likewise delivered clinically relevant data. Cardiopulmonary exercise testing provides clinicians with biomarkers and clinical outcomes, and researchers with novel insights into fundamental biological mechanisms reflecting an integrated physiological response hidden at rest. Momentum from these pioneering observations in multiple disease states should impel clinicians to employ similar methods in other patient populations; e.g., sickle cell disease. Advances in pediatric exercise science will elucidate new pathways that may identify novel biomarkers. Our initial aim of this essay is to highlight the clinical relevance of exercise testing to determine peakV˙O2, and thereby convince clinicians of its merit, stimulating future clinical investigators to broaden the application of exercise testing in pediatrics.
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