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Siewe N, Friedman A. Osteoporosis induced by cellular senescence: A mathematical model. PLoS One 2024; 19:e0303978. [PMID: 38805428 PMCID: PMC11132490 DOI: 10.1371/journal.pone.0303978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Accepted: 05/03/2024] [Indexed: 05/30/2024] Open
Abstract
Osteoporosis is a disease characterized by loss of bone mass, where bones become fragile and more likely to fracture. Bone density begins to decrease at age 50, and a state of osteoporosis is defined by loss of more than 25%. Cellular senescence is a permanent arrest of normal cell cycle, while maintaining cell viability. The number of senescent cells increase with age. Since osteoporosis is an aging disease, it is natural to consider the question to what extend senescent cells induce bone density loss and osteoporosis. In this paper we use a mathematical model to address this question. We determine the percent of bone loss for men and women during age 50 to 100 years, and the results depend on the rate η of net formation of senescent cell, with η = 1 being the average rate. In the case η = 1, the model simulations are in agreement with empirical data. We also consider senolytic drugs, like fisetin and quercetin, that selectively eliminate senescent cells, and assess their efficacy in terms of reducing bone loss. For example, at η = 1, with estrogen hormonal therapy and early treatment with fisetin, bone density loss for women by age 75 is 23.4% (below osteoporosis), while with no treatment with fisetin it is 25.8% (osteoporosis); without even a treatment with estrogen hormonal therapy, bone loss of 25.3% occurs already at age 65.
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Affiliation(s)
- Nourridine Siewe
- School of Mathematics and Statistics, College of Science, Rochester Institute of Technology, Rochester, New York, United States of America
| | - Avner Friedman
- Department of Mathematics, The Ohio State University, Columbus, Ohio, United States of America
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Abdelrahman S, Purcell M, Rantalainen T, Coupaud S, Ireland A. Regional and temporal variation in bone loss during the first year following spinal cord injury. Bone 2023; 171:116726. [PMID: 36871898 DOI: 10.1016/j.bone.2023.116726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 02/24/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023]
Abstract
Osteoporosis is a consequence of spinal cord injury (SCI) that leads to fragility fractures. Visual assessment of bone scans suggests regional variation in bone loss, but this has not been objectively characterised. In addition, substantial inter-individual variation in bone loss following SCI has been reported but it is unclear how to identify fast bone losers. Therefore, to examine regional bone loss, tibial bone parameters were assessed in 13 individuals with SCI (aged 16-76 years). Peripheral quantitative computed tomography scans at 4 % and 66 % tibia length were acquired within 5 weeks, 4 months and 12 months postinjury. Changes in total bone mineral content (BMC), and bone mineral density (BMD) were assessed in ten concentric sectors at the 4 % site. Regional changes in BMC and cortical BMD were analysed in thirty-six polar sectors at the 66 % site using linear mixed effects models. Relationships between regional and total loss at 4 months and 12 months timepoints were assessed using Pearson correlation. At the 4 % site, total BMC (P = 0.001) decreased with time. Relative losses were equal across the sectors (all P > 0.1). At the 66 % site, BMC and cortical BMD absolute losses were similar (all P > 0.3 and P > 0.05, respectively) across polar sectors, but relative loss was greatest in the posterior region (all P < 0.01). At both sites, total BMC loss at 4 months was strongly positively associated with the total loss at 12 months (r = 0.84 and r = 0.82 respectively, both P < 0.001). This correlation was stronger than those observed with 4-month BMD loss in several radial and polar sectors (r = 0.56-0.77, P < 0.05). These results confirm that SCI-induced bone loss varies regionally in the tibial diaphysis. Moreover, bone loss at 4 months is a strong predictor of total loss 12 months postinjury. More studies on larger populations are required to confirm these findings.
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Affiliation(s)
- Shima Abdelrahman
- Department of Biomedical Engineering, Wolfson Building, University of Strathclyde, Glasgow, United Kingdom; Scottish Centre for Innovation in Spinal Cord Injury, Queen Elizabeth National Spinal Injuries Unit, Queen Elizabeth University Hospital, Glasgow, United Kingdom; Research Centre for Musculoskeletal Science & Sports Medicine, Department of Life Sciences, Manchester Metropolitan University, Manchester, United Kingdom.
| | - Mariel Purcell
- Scottish Centre for Innovation in Spinal Cord Injury, Queen Elizabeth National Spinal Injuries Unit, Queen Elizabeth University Hospital, Glasgow, United Kingdom
| | - Timo Rantalainen
- Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Finland
| | - Sylvie Coupaud
- Department of Biomedical Engineering, Wolfson Building, University of Strathclyde, Glasgow, United Kingdom; Scottish Centre for Innovation in Spinal Cord Injury, Queen Elizabeth National Spinal Injuries Unit, Queen Elizabeth University Hospital, Glasgow, United Kingdom
| | - Alex Ireland
- Research Centre for Musculoskeletal Science & Sports Medicine, Department of Life Sciences, Manchester Metropolitan University, Manchester, United Kingdom
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Breast Cancer Exosomal microRNAs Facilitate Pre-Metastatic Niche Formation in the Bone: A Mathematical Model. Bull Math Biol 2023; 85:12. [PMID: 36607440 DOI: 10.1007/s11538-022-01117-0] [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: 08/29/2022] [Accepted: 12/26/2022] [Indexed: 01/07/2023]
Abstract
Pre-metastatic niche is a location where cancer cells, separating from a primary tumor, find "fertile soil" for growth and proliferation, ensuring successful metastasis. Exosomal miRNAs of breast cancer are known to enter the bone and degrade it, which facilitates cancer cells invasion into the bone interior and ensures its successful colonization. In this paper, we use a mathematical model to first describe, in health, the continuous remodeling of the bone by bone-forming osteoblasts, bone-resorbing osteoclasts and the RANKL-OPG-RANK signaling system, which keeps the balance between bone formation and bone resorption. We next demonstrate how breast cancer exosomal miRNAs disrupt this balance, either by increasing or by decreasing the ratio of osteoclasts/osteoblasts, which results in abnormal high bone resorption or abnormal high bone forming, respectively, and in bone weakening in both cases. Finally we consider the case of abnormally high resorption and evaluate the effect of drugs, which may increase bone density to normal level, thus protecting the bone from invasion by cancer cells.
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Nguyen-Khac V, Bonnet-Lebrun A, Skalli W, Adamsbaum C, Linglart A, Wicart P. Changes in adipose bone marrow and bone morphology in X-linked hypophosphatemic rickets. Orthop Traumatol Surg Res 2022; 109:103529. [PMID: 36565743 DOI: 10.1016/j.otsr.2022.103529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 08/01/2022] [Accepted: 08/26/2022] [Indexed: 12/24/2022]
Abstract
INTRODUCTION X-linked hypophosphatemic (XLH) rickets causes significant bone deformities in the lower limbs resulting from a bone mineralization defect. According to Frost's Mechanostat theory, compensatory modeling of the bones takes place during increased mechanical loads. In addition, mechanical stimuli modulate the differentiation of mesenchymal stem cells; common precursors to bone marrow adipocytes and osteoblasts. HYPOTHESIS Bone deformities of the lower limbs lead to increased femoral bone mass and decreased fatty infiltration of the bone marrow (FIBM) in children with XLH rickets compared to a control group. PATIENTS AND METHODS Eleven children (10.3years [6-17]) with XLH rickets and 22 healthy children (10.2years [5-15.5]) underwent lower limb Magnetic Resonance Imaging. A calculation of FIBM was performed at the mid-femur, as well as a calculation of the total bone cross-sectional area (CSA), the cortical CSA, the anteroposterior and mediolateral axes of the femur, bone marrow and the thickness of the femoral cortices. RESULTS Total bone CSA, total cortical CSA and bone marrow CSA were higher in the XLH group than in the control group (p<0.05). The mid-lateral diameters of the femur and bone marrow were more elongated than those of the control group (p<0.001). Only the anterior cortex was thinned in the XLH group (p=0.001), while there was no difference with the control group for the posterior, medial and lateral cortices. The total percentage of FIBM was 72.81% [±3.95] and 77.4% [±5.52] for the XLH and control groups respectively (p<0.001). DISCUSSION The increase in bone mass in the XLH population reflects an adaptation of bone tissue to the bone deformities present in this pathology. The decrease in FIBM indicates a lower risk of osteoporosis in the XLH population and may constitute a new monitoring parameter in this pathology. LEVEL OF STUDY III; Case-control study.
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Affiliation(s)
| | - Aurore Bonnet-Lebrun
- ENSAM, Institut de Biomécanique Humaine G.-Charpark, 151, Boulevard de l'Hôpital, 75013 Paris, France
| | - Wafa Skalli
- ENSAM, Institut de Biomécanique Humaine G.-Charpark, 151, Boulevard de l'Hôpital, 75013 Paris, France
| | - Catherine Adamsbaum
- Hôpital Bicêtre, AP-HP, 78, rue du Général-Leclerc, 94270 Le Kremlin-Bicêtre, France
| | - Agnès Linglart
- Hôpital Bicêtre, AP-HP, 78, rue du Général-Leclerc, 94270 Le Kremlin-Bicêtre, France
| | - Philippe Wicart
- Hospital Necker-Enfants-Malades, AP-HP, 149, rue de Sèvre, 75015 Paris, France
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Belavy DL, Miller CT, Owen PJ, Rantalainen T, Connell D, Hahne AJ, Ford JJ, Trudel G. Exercise may impact on lumbar vertebrae marrow adipose tissue: Randomised controlled trial. Bone 2022; 157:116338. [PMID: 35085839 DOI: 10.1016/j.bone.2022.116338] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/21/2021] [Accepted: 01/12/2022] [Indexed: 01/27/2023]
Abstract
BACKGROUND Animal and human cross-sectional data suggest that bone marrow adipose tissue (MAT) may respond to mechanical loads and exercise. We conducted the first randomised controlled trial of exercise on MAT modulations in humans. METHODS Forty patients with chronic non-specific low back pain (NSCLBP) were enrolled in a six-month single-blinded randomised controlled trial (ACTRN12615001270505). Twenty patients loaded their spines via progressive upright aerobic and resistance exercises targeting major muscle groups (Exercise). Twenty patients performed non-weightbearing motor control training and manual therapy (Control). Testing occurred at baseline, 3-months (3mo) and 6-months (6mo). Lumbar vertebral fat fraction (VFF) was measured using magnetic resonance imaging axial mDixon sequences. RESULTS When compared to baseline (percent change), lumbar vertebral fat fraction (VFF; measured using magnetic resonance imaging axial mDixon sequences) was lower in Exercise at 3mo at L2 (-3.7[6.8]%, p = 0.033) and L4 (-2.6[4.1]%, p = 0.015), but not in Control. There were no between-group effects. The effects of Exercise on VFF were sex-specific, with VFF lower in men at L2, L3, L4 at 3mo and at L1, L2, L3 and L4 at 6mo (p all ≤ 0.05), but not in women. Leg and trunk lean mass were increased at 3mo in Exercise. Changes in VFF correlated significantly with changes in total fat (ρ = 0.40) and lean (ρ = -0.41) masses, but not with lumbar BMD (ρ = -0.10) or visceral adipose tissue volume (ρ = 0.23). CONCLUSIONS This trial provided first prospective evidence in humans that a moderate exercise intervention may modulate lumbar VFF as a surrogate measure of MAT at 3mo, yet not 6mo. The effect of exercise on MAT may be more prominent in males than females.
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Affiliation(s)
- Daniel L Belavy
- Hochschule für Gesundheit (University of Applied Sciences), Department of Applied Health Sciences, Division of Physiotherapy, Gesundheitscampus 6-8, 44801 Bochum, Germany; Deakin University, Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia.
| | - Clint T Miller
- Deakin University, Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia.
| | - Patrick J Owen
- Deakin University, Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia.
| | - Timo Rantalainen
- Deakin University, Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia; Gerontology Research Center and Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland.
| | - David Connell
- Imaging@Olympic Park, Melbourne, Victoria, Australia.
| | - Andrew J Hahne
- Low Back Research Team, College of Science, Health & Engineering, La Trobe University, Bundoora, Victoria, Australia.
| | - Jon J Ford
- Low Back Research Team, College of Science, Health & Engineering, La Trobe University, Bundoora, Victoria, Australia; Advance HealthCare, Boronia, Victoria, Australia.
| | - Guy Trudel
- Division of Physical Medicine and Rehabilitation, Department of Medicine, Bone and Joint Research Laboratory, University of Ottawa, The Ottawa Hospital Research Institute, Canada.
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Fibula response to disuse: a longitudinal analysis in people with spinal cord injury. Arch Osteoporos 2022; 17:51. [PMID: 35305185 PMCID: PMC8934326 DOI: 10.1007/s11657-022-01095-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 03/09/2022] [Indexed: 02/03/2023]
Abstract
Fibular response to disuse has been described in cross-sectional but not longitudinal studies. This study assessed fibular bone changes in people with spinal cord injury. Fibular bone loss was less than in the tibia and was not correlated together. This might explain low fibular fracture incidents in these patients. PURPOSE Cross-sectional studies suggest that the fibula responds differently to loading and disuse compared to the tibia. Whilst tibial bone changes following spinal cord injury (SCI) have been established in longitudinal studies, fibular changes remain unexplored. METHODS Fibular and tibial bone parameters were assessed in 13 individuals with SCI (aged 16-76 years). Peripheral quantitative computed tomography scans were acquired at 4%, 38% and 66% distal-proximal tibia length at 5 weeks and 12 months post-injury. Changes in 4% site total bone mineral content (BMC), total cross-sectional area (CSA) and bone mineral density (BMD), and 38% and 66% sites total BMC, total CSA, cortical BMD and cortical CSA were assessed using paired T-tests. Relationships between bone loss in the two bones at equivalent sites were assessed using paired T-tests and correlation. RESULTS At the 4% site, fibular total BMC and BMD losses were less than tibial losses (- 6.9 ± 5.1% and - 6.6 ± 6.0% vs - 14.8 ± 12.4% and - 14.4 ± 12.4%, p = 0.02 and p = 0.03, respectively). Similarly, at the 66% site, fibular BMC losses were less than those in the tibia (- 2.0 ± 2.6% vs - 4.3 ± 3.6%, p = 0.03), but there was no difference at 38% (- 1.8 ± 3.5% vs - 3.8 ± 2.1%, p = 0.1). No correlation was observed for BMC changes between the two bones (all p > 0.25). CONCLUSION These results support cross-sectional evidence of smaller disuse-related bone loss in the fibula compared to the tibia. These results may in part explain lower incidence of fibula fractures in individuals with chronic SCI. The lack of association between losses in the two bones might point to different underlying mechanisms.
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Little-Letsinger SE, Rubin J, Diekman B, Rubin CT, McGrath C, Pagnotti GM, Klett EL, Styner M. Exercise to Mend Aged-tissue Crosstalk in Bone Targeting Osteoporosis & Osteoarthritis. Semin Cell Dev Biol 2022; 123:22-35. [PMID: 34489173 PMCID: PMC8840966 DOI: 10.1016/j.semcdb.2021.08.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 08/16/2021] [Accepted: 08/19/2021] [Indexed: 12/16/2022]
Abstract
Aging induces alterations in bone structure and strength through a multitude of processes, exacerbating common aging- related diseases like osteoporosis and osteoarthritis. Cellular hallmarks of aging are examined, as related to bone and the marrow microenvironment, and ways in which these might contribute to a variety of age-related perturbations in osteoblasts, osteocytes, marrow adipocytes, chondrocytes, osteoclasts, and their respective progenitors. Cellular senescence, stem cell exhaustion, mitochondrial dysfunction, epigenetic and intracellular communication changes are central pathways and recognized as associated and potentially causal in aging. We focus on these in musculoskeletal system and highlight knowledge gaps in the literature regarding cellular and tissue crosstalk in bone, cartilage, and the bone marrow niche. While senolytics have been utilized to target aging pathways, here we propose non-pharmacologic, exercise-based interventions as prospective "senolytics" against aging effects on the skeleton. Increased bone mass and delayed onset or progression of osteoporosis and osteoarthritis are some of the recognized benefits of regular exercise across the lifespan. Further investigation is needed to delineate how cellular indicators of aging manifest in bone and the marrow niche and how altered cellular and tissue crosstalk impact disease progression, as well as consideration of exercise as a therapeutic modality, as a means to enhance discovery of bone-targeted therapies.
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Affiliation(s)
- SE Little-Letsinger
- Department of Medicine, Division of Endocrinology & Metabolism, University of North Carolina at Chapel Hill
| | - J Rubin
- Department of Medicine, Division of Endocrinology & Metabolism, University of North Carolina at Chapel Hill,North Carolina Diabetes Research Center (NCDRC), University of North Carolina at Chapel Hill,Department of Medicine, Thurston Arthritis Research Center (TARC), University of North Carolina at Chapel Hill
| | - B Diekman
- Department of Medicine, Thurston Arthritis Research Center (TARC), University of North Carolina at Chapel Hill,Joint Departments of Biomedical Engineering NC State & University of North Carolina at Chapel Hill
| | - CT Rubin
- Department of Biomedical Engineering, State University of New York at Stony Brook
| | - C McGrath
- Department of Medicine, Division of Endocrinology & Metabolism, University of North Carolina at Chapel Hill
| | - GM Pagnotti
- Dept of Endocrine, Neoplasia, and Hormonal Disorders, University Texas MD Anderson Cancer Center, Houston
| | - EL Klett
- Department of Medicine, Division of Endocrinology & Metabolism, University of North Carolina at Chapel Hill,Department of Nutrition, School of Public Health, University of North Carolina at Chapel Hill
| | - M Styner
- Department of Medicine, Division of Endocrinology & Metabolism, University of North Carolina at Chapel Hill,North Carolina Diabetes Research Center (NCDRC), University of North Carolina at Chapel Hill,Department of Medicine, Thurston Arthritis Research Center (TARC), University of North Carolina at Chapel Hill
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Yazdanpanah Z, Beigrezaei S, Mohseni-Takalloo S, Soltani S, Rajaie SH, Zohrabi T, Kaviani M, Forbes SC, Baker JS, Salehi-Abargouei A. Does exercise affect bone mineral density and content when added to a calorie-restricted diet? A systematic review and meta-analysis of controlled clinical trials. Osteoporos Int 2022; 33:339-354. [PMID: 34643754 DOI: 10.1007/s00198-021-06187-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 09/29/2021] [Indexed: 10/20/2022]
Abstract
The effects of exercise in conjunction with weight-loss diets on bone health are mixed. Our objective was to systematically review and meta-analyze controlled clinical trials in adults investigating the addition of exercise to a weight-loss diet compared with a calorie-matched weight-loss diet without exercise on bone measures. Online databases including PubMed/MEDLINE, EMBASE, ISI (Web of Science), Scopus, and Google Scholar were searched up to April 2021 with no restriction. A random effects model was used to calculate the overall estimates. Quality of evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) methodology. Fourteen eligible controlled clinical trials were included in the systematic review. The meta-analysis revealed that, compared to weight-loss diets alone, the addition of exercise did not improve total body bone mineral density (BMD) [weighted mean difference (WMD) = 0.002 g/cm2, P = 0.62, n = 8], lumbar BMD (WMD = 0.007 g/cm2, P = 0.44, n = 9), total hip BMD (WMD = 0.015 g/cm2, P = 0.14, n = 4) and total bone mineral content (BMC) (WMD = - 11.97 g, P = 0.29, n = 7). Subgroup analysis revealed that resistance exercise in conjunction with hypocaloric diets positively affects total BMD compared to an energy restrictive diet alone (WMD = 0.01 g/cm2, P = 0.003, n = 3). Overall, it appears that only resistance exercise beneficially affects total BMD during a calorie-restricted diet in adults. Further well-controlled and long-term clinical trials are still needed to confirm these results. PROSPERO registration number: CRD42020173434.
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Affiliation(s)
- Zeinab Yazdanpanah
- Department of Nutrition, Faculty of Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, PO Code 8915173160 , Yazd, Iran
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Sara Beigrezaei
- Department of Nutrition, Faculty of Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, PO Code 8915173160 , Yazd, Iran
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Sahar Mohseni-Takalloo
- Department of Nutrition, Faculty of Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, PO Code 8915173160 , Yazd, Iran
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Noncommunicable Diseases Research Center, Bam University of Medical Sciences, Bam, Iran
| | - Sepideh Soltani
- Yazd Cardiovascular Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Seyede Hamide Rajaie
- Department of Nutrition, Faculty of Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, PO Code 8915173160 , Yazd, Iran
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Tayebeh Zohrabi
- Department of Nutrition, Faculty of Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, PO Code 8915173160 , Yazd, Iran
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mojtaba Kaviani
- School of Nutrition and Dietetics, Faculty of Pure & Applied Science, Acadia University, Wolfville, NS, Canada
| | - Scott C Forbes
- Department of Physical Education Studies, Faculty of Education, Brandon University, Brandon, MB, Canada
| | - Julien S Baker
- Centre for Health and Exercise Science Research, Department of Sport, Physical Education and Health, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Amin Salehi-Abargouei
- Department of Nutrition, Faculty of Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, PO Code 8915173160 , Yazd, Iran.
- Nutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
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Owen PJ, Hart NH, Latella C, Hendy AM, Lamon S, Rantalainen T. Identifying and Assessing Inter-Muscular Fat at the Distal Diaphyseal Femur Measured by Peripheral Quantitative Computed Tomography (pQCT). J Clin Densitom 2021; 24:106-111. [PMID: 31848038 DOI: 10.1016/j.jocd.2019.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/22/2019] [Accepted: 11/25/2019] [Indexed: 10/25/2022]
Abstract
INTRODUCTION Inter-/intramuscular fat can be assessed with peripheral Quantitative Computed Tomography (pQCT) and is of interest as an indicator of "muscle quality." Typical pQCT scan sites (forearm, lower leg) have a low amount of inter-/intramuscular fat, however distal diaphyseal femur scan sites with conspicuous inter-/intramuscular fat have been identified as potentially more prudent scan sites, even in healthy adolescents. However, current state of the art analysis methods require labor-intensive manual segmentation of the scan. The purpose of the present study was to evaluate the reliability of a novel open source automated enclosing convex polygon approach (source code https://github.com/tjrantal/pQCT, commit cec9bce) to quantify inter-/intramuscular fat from femoral pQCT scans in healthy adults. METHODOLOGY The distal diaphyseal femur (25% of tibial length from the knee joint towards the hip) of 27 adults aged 18-50 yr were scanned twice, 1 wk apart, using pQCT. Subcutaneous fat, muscle, inter-/intramuscular fat, and marrow areas, and corresponding densities were evaluated using a method we have reported previously, as well as the novel enclosing convex polygon method. RESULTS The session-to-session reliability of the assessments was fair to excellent using the previously reported method as indicated by intraclass correlation coefficient (ICC2,1) ranging from 0.45 to 1.00, while the novel method produced excellent reliability (ICC2,1 0.78-1.00). CONCLUSION Distal diaphyseal femur appears to be a potentially informative and prudent scan site for inter-/intramuscular fat evaluation with pQCT.
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Affiliation(s)
- Patrick J Owen
- Deakin University, Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia
| | - Nicolas H Hart
- Exercise Medicine Research Institute, Edith Cowan University, Perth, Western Australia, Australia; Institute for Health Research, University of Notre Dame Australia, Perth, Western Australia, Australia; Western Australian Bone Research Collaboration, Perth, Western Australia, Australia
| | - Christopher Latella
- Neurophysiology Research Laboratory, School of Medical and Health Sciences, Edith Cowan University, Perth, Wetsern Australia, Australia
| | - Ashlee M Hendy
- Deakin University, Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia
| | - Séverine Lamon
- Deakin University, Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia
| | - Timo Rantalainen
- Deakin University, Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Geelong, Victoria, Australia; Exercise Medicine Research Institute, Edith Cowan University, Perth, Western Australia, Australia; Institute for Health Research, University of Notre Dame Australia, Perth, Western Australia, Australia; Western Australian Bone Research Collaboration, Perth, Western Australia, Australia; Gerontology Research Center and Faculty of Sport and Health Sciences, University of Jyväskylä, Finland.
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10
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Zhou H, Trudel G, Alexeev K, Thomas J, Laneuville O. Hyperplasia and accelerated hypertrophy of marrow adipocytes with knee immobilization were sustained despite remobilization. J Appl Physiol (1985) 2020; 129:701-708. [PMID: 32853104 DOI: 10.1152/japplphysiol.00539.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Skeletal disuse can cause an accumulation of bone marrow adipose tissue (MAT) characterized by a combination of marrow adipocyte hyperplasia and/or hypertrophy. The malleability of MAT accumulation and of the hyperplasia and hypertrophy upon remobilization is unknown. In this study, we showed extensive hyperplasia and accelerated hypertrophy of bone marrow adipocytes in the proximal tibia epiphysis of rat knees immobilized for durations between 1 and 32 wk. Similar histomorphometric measures of adipocytes carried out in unoperated controls allowed distinguishing the effects of immobilization from the effects of aging. Although both knee immobilization and aging led to adipocyte hypertrophy, adipocyte hyperplasia was the hallmark signature effect of immobilization on MAT. Both bone marrow adipocyte hyperplasia and hypertrophy were sustained despite knee remobilization for durations up to four times the duration of immobilization. These results suggest that adipocyte hyperplasia is the predominant mechanism explaining MAT accumulation in skeletal disuse. In this model, the changes were unremitting for the investigated time points. Investigating the cellular and molecular mechanisms of marrow adipocyte mechanoregulation will be important to better understand how adipocytes adapt to changes in mechanical environments.NEW & NOTEWORTHY This longitudinal study elucidates the response of marrow adipose tissue adipocytes in weight-bearing joints to changes in different mechanical environments, and we provide insight on the malleability of the changes over time. In a rat animal model, knee immobilization induced hyperplasia and accelerated the age-dependent hypertrophy of adipocytes. Changes in adipocyte number and size were sustained despite unassisted remobilization. Multimodal distributions of cell size were characteristic of bone marrow adipocytes.
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Affiliation(s)
- Haodong Zhou
- Department of Biology, Faculty of Science, University of Ottawa, Ontario, Canada.,Bone and Joint Research Laboratory, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Guy Trudel
- Bone and Joint Research Laboratory, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.,Division of Physical Medicine and Rehabilitation, Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada
| | - Konstantin Alexeev
- Department of Biology, Faculty of Science, University of Ottawa, Ontario, Canada.,Bone and Joint Research Laboratory, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Justin Thomas
- Department of Biology, Faculty of Science, University of Ottawa, Ontario, Canada.,Bone and Joint Research Laboratory, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Odette Laneuville
- Department of Biology, Faculty of Science, University of Ottawa, Ontario, Canada.,Bone and Joint Research Laboratory, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
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11
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Aparisi Gómez MP, Ayuso Benavent C, Simoni P, Aparisi F, Guglielmi G, Bazzocchi A. Fat and bone: the multiperspective analysis of a close relationship. Quant Imaging Med Surg 2020; 10:1614-1635. [PMID: 32742956 DOI: 10.21037/qims.2020.01.11] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The study of bone has for many years been focused on the study of its mineralized component, and one of the main objects of study as radiology developed as a medical specialty. The assessment has until recently been almost limited to its role as principal component of the scaffolding of the human body. Bone is a very active tissue, in continuous cross-talk with other organs and systems, with functions that are endocrine and paracrine and that have an important involvement in metabolism, ageing and health in general. Bone is also the continent for the bone marrow, in the form of "yellow marrow" (mainly adipocytes) or "red marrow" (hematopoietic cells and adipocytes). Recently, numerous studies have focused on these adipocytes contained in the bone marrow, often referred to as marrow adipose tissue (MAT). Bone marrow adipocytes do not only work as storage tissue, but are also endocrine and paracrine cells, with the potential to contribute to local bone homeostasis and systemic metabolism. Many metabolic disorders (osteoporosis, obesity, diabetes) have a complex and still not well-established relationship with MAT. The development of imaging methods, in particular the development of cross-sectional imaging has helped us to understand how much more laid beyond our classical way to look at bone. The impact on the mineralized component of bone in some cases (e.g., osteoporosis) is well-established, and has been extensively analyzed and quantified through different radiological methods. The application of advanced magnetic resonance techniques has unlocked the possibility to access the detailed study, characterization and quantification of the bone marrow components in a non-invasive way. In this review, we will address what is the evidence on the physiological role of MAT in normal skeletal health (interaction with the other bone components), during the process of normal aging and in the context of some metabolic disorders, highlighting the role that imaging methods play in helping with quantification and diagnosis.
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Affiliation(s)
- Maria Pilar Aparisi Gómez
- Department of Radiology, Auckland City Hospital, Auckland, New Zealand.,Department of Radiology, Hospital Vithas Nueve de Octubre, Valencia, Spain
| | | | - Paolo Simoni
- Department of Radiology, "Reine Fabiola" Children's University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Francisco Aparisi
- Department of Radiology, Hospital Vithas Nueve de Octubre, Valencia, Spain
| | - Giuseppe Guglielmi
- Department of Radiology, University of Foggia, Foggia, Italy.,Department of Radiology, Hospital San Giovanni Rotondo, Foggia, Italy
| | - Alberto Bazzocchi
- Diagnostic and Interventional Radiology, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
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12
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Bone marrow fat: friend or foe in people with diabetes mellitus? Clin Sci (Lond) 2020; 134:1031-1048. [PMID: 32337536 DOI: 10.1042/cs20200220] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 12/22/2022]
Abstract
Global trends in the prevalence of overweight and obesity put the adipocyte in the focus of huge medical interest. This review highlights a new topic in adipose tissue biology, namely the emerging pathogenic role of fat accumulation in bone marrow (BM). Specifically, we summarize current knowledge about the origin and function of BM adipose tissue (BMAT), provide evidence for the association of excess BMAT with diabetes and related cardiovascular complications, and discuss potential therapeutic approaches to correct BMAT dysfunction. There is still a significant uncertainty about the origins and function of BMAT, although several subpopulations of stromal cells have been suggested to have an adipogenic propensity. BM adipocytes are higly plastic and have a distinctive capacity to secrete adipokines that exert local and endocrine functions. BM adiposity is abundant in elderly people and has therefore been interpreted as a component of the whole-body ageing process. BM senescence and BMAT accumulation has been also reported in patients and animal models with Type 2 diabetes, being more pronounced in those with ischaemic complications. Understanding the mechanisms responsible for excess and altered function of BMAT could lead to new treatments able to preserve whole-body homeostasis.
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13
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Bone marrow adipose tissue is a unique adipose subtype with distinct roles in glucose homeostasis. Nat Commun 2020; 11:3097. [PMID: 32555194 PMCID: PMC7303125 DOI: 10.1038/s41467-020-16878-2] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 05/29/2020] [Indexed: 12/30/2022] Open
Abstract
Bone marrow adipose tissue (BMAT) comprises >10% of total adipose mass, yet unlike white or brown adipose tissues (WAT or BAT) its metabolic functions remain unclear. Herein, we address this critical gap in knowledge. Our transcriptomic analyses revealed that BMAT is distinct from WAT and BAT, with altered glucose metabolism and decreased insulin responsiveness. We therefore tested these functions in mice and humans using positron emission tomography-computed tomography (PET/CT) with 18F-fluorodeoxyglucose. This revealed that BMAT resists insulin- and cold-stimulated glucose uptake, while further in vivo studies showed that, compared to WAT, BMAT resists insulin-stimulated Akt phosphorylation. Thus, BMAT is functionally distinct from WAT and BAT. However, in humans basal glucose uptake in BMAT is greater than in axial bones or subcutaneous WAT and can be greater than that in skeletal muscle, underscoring the potential of BMAT to influence systemic glucose homeostasis. These PET/CT studies characterise BMAT function in vivo, establish new methods for BMAT analysis, and identify BMAT as a distinct, major adipose tissue subtype.
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14
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Bone marrow fat fraction assessment in regard to physical activity: KORA FF4-3-T MR imaging in a population-based cohort. Eur Radiol 2020; 30:3417-3428. [PMID: 32086579 DOI: 10.1007/s00330-019-06612-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 10/31/2019] [Accepted: 12/06/2019] [Indexed: 01/03/2023]
Abstract
OBJECTIVES To establish the effect of different degrees and kinds of physical activity on bone marrow fat (BMAT) content at different anatomical locations in a population-based cohort study undergoing whole-body MR imaging. METHODS Subjects of the KORA FF4 study without known cardiovascular disease underwent BMAT fat fraction (FF) quantification in L1 and L2 vertebrae and femoral heads/necks (hip) via a 2-point T1-weighted VIBE Dixon sequence. BMAT-FF was calculated as mean value (fat image) divided by mean value (fat + water image). Physical activity was determined by self-assessment questionnaire regarding time spent exercising, non-exercise walking, non-exercise cycling, and job-related physical activity. RESULTS A total of 385 subjects (96% of 400 available; 56 ± 9.1 years; 58% male) were included in the analysis. Exercise was distributed quite evenly (29% > 2 h/week; 31% ~ 1 h/week (regularly); 15% ~ 1 h/week (irregularly); 26% no physical activity). BMAT-FF was 52.6 ± 10.2% in L1, 56.2 ± 10.3% in L2, 87.4 ± 5.9% in the right hip, and 87.2 ± 5.9% in the left hip (all p < 0.001). Correlation of BMAT-FF between spine and hip was only moderate (r 0.42 to 0.46). Spinal BMAT-FF, but not hip BMAT-FF, was inversely associated with exercise > 2 h/week (p ≤ 0.02 vs. p ≥ 0.35, respectively). These associations remained significant after adjusting for age, gender, waist circumference, and glucose tolerance. No coherent association was found between BMAT-FF and physical activity in the less active groups. CONCLUSIONS In our study, exercise was inversely correlated with vertebral BMAT-FF, but not hip BMAT-FF, when exercising for more than 2 h per week. Physical activity seems to affect the spine at least preferentially compared to the hip. KEY POINTS • In our population-based cohort, at least 2 h of physical activity per week were required to show lower levels of bone marrow adipose tissue fat fraction in MRI. • Physical activity seems to affect bone marrow adipose tissue at least preferentially at the spine in contrast to the proximal femur.
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15
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Abstract
PURPOSE OF REVIEW The goal of this review is to highlight the deficits in muscle and bone in children with cerebral palsy (CP), discuss the muscle-bone relationship in the CP population, and identify muscle-based intervention strategies that may stimulate an improvement in their bone development. RECENT FINDINGS The latest research suggests that muscle and bone are both severely underdeveloped and weak in children with CP, even in ambulatory children with mild forms of the disorder. The small and low-performing muscles and limited participation in physical activity are likely the major contributors to the poor bone development in children with CP. However, the muscle-bone relationship may be complicated by other factors, such as a high degree of fat and collagen infiltration of muscle, atypical muscle activation, and muscle spasticity. Muscle-based interventions, such as resistance training, vibration, and nutritional supplementation, have the potential to improve bone development in children with CP, especially if they are initiated before puberty. Studies are needed to identify the muscle-related factors with the greatest influence on bone development in children with CP. Identifying treatment strategies that capitalize on the relationship between muscle and bone, while also improving balance, coordination, and physical activity participation, is an important step toward increasing bone strength and minimizing fractures in children with CP.
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Affiliation(s)
- Christopher M Modlesky
- Department of Kinesiology, University of Georgia, 330 River Road, Room 353, Athens, GA, 30602, USA.
| | - Chuan Zhang
- Department of Kinesiology, University of Georgia, 330 River Road, Room 353, Athens, GA, 30602, USA
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16
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Taufik NH, Tulaar ABM, Moesbar N, Ganie RA. The Effect of Isometric Exercise Plantar Flexor on Osteoblast Activity Measured by Bone Specific Alkaline Phosphatase and Callus Formation in a Patient Post Open Reduction Internal Fixation with Non-articular Tibia Fracture. Open Access Maced J Med Sci 2019; 7:3409-3415. [PMID: 32002063 PMCID: PMC6980808 DOI: 10.3889/oamjms.2019.435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 09/15/2019] [Accepted: 09/16/2019] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Post-operative non-articular tibia fracture several problems that can occur include; pain, muscles atrophy, muscles weakness, joint stiffness, delayed union, and non-union that makes patients limited in their daily activities. Several factors that play a role in the process of fracture healing include osteoblast activity and exercise. Isometric exercises plantar flexor might effectively prevent the problem. Markers of osteoblast activity are bone-specific alkaline phosphatase (BSAP) levels and Hummer scale callus formation. Not yet known the effect isometric exercise of plantar flexor on osteoblast activity in the post open reduction internal fixation of non-articular tibia fractures, due to the lack of studies in this field. AIM This research was conducted to investigate the effect of isometric plantar flexor on osteoblast activity and callus formation in patients post open reduction internal fixation nonarticular tibial fractures. HYPOTHESIS There are differences in osteoblast activity and callus formation between groups that do isometric exercises of plantar flexor muscles with those that without isometric exercises plantar flexor. ANALYSIS Hypothesis test used a paired t-test with a value of α 0.05 and a confidence level of 95%. METHODS This clinical trial was true experimental with pre-post test control group design divided into two groups, group I obtained treatment of isometric exercises of the plantar flexor muscle, range of motion knee joint, and ankle while group II obtained the range of motion knee joints and ankle. Osteoblast activity measured with bone-specific alkaline phosphatase level and callus formation. RESULTS The result of the study found to increase mean bone-specific alkaline phosphatase group I; 15.6 and group II; 5.2. A paired t-test of independent samples with α of 0.05 and confidence interval 95% was obtained p-value = 0.000, there is a significant difference in increased levels of bone-specific alkaline phosphatase group I obtained isometric exercises plantar flexor with group II without isometric exercises plantar flexor in patients post open reduction internal fixation of a non-articular tibia fracture. Radiographic examination of Hummer scale callus in group I who carried out isometric exercises plantar flexor had an average value of 2.63, whereas group II without isometric exercises plantar flexor average of 3.06. Wilcoxon test with α 0.05 and 95% confidence interval obtained p-value = 0.000, there is a significant difference in callus image in both groups of patients post open reduction internal fixation non-articular tibia fracture. The linear regression calculated of callus assessment with bone-specific alkaline phosphatase obtained the value of R quadrat = 0.793, which showed that the formation of callus Hummer classification could predict the change in bone-specific alkaline phosphatase value by 79%. CONCLUSION The research found isometric exercise plantar flexor in patients post open reduction internal fixation non-articular tibia fracture enhances osteoblast activity and callus formation that will likely short the healing process time and prevent delayed union or non-union.
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Affiliation(s)
- Nasyaruddin Herry Taufik
- Department of Physical Medicine and Rehabilitation, Syiah Kuala University, Darussalam-Banda Aceh, Indonesia
| | - Angela Bibiana Maria Tulaar
- Department of Physical Medicine and Rehabilitation, Syiah Kuala University, Darussalam-Banda Aceh, Indonesia
| | - Nazar Moesbar
- Department of Physical Medicine and Rehabilitation, Syiah Kuala University, Darussalam-Banda Aceh, Indonesia
| | - Ratna Akbarie Ganie
- Department of Physical Medicine and Rehabilitation, Syiah Kuala University, Darussalam-Banda Aceh, Indonesia
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17
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Exercise Snacking to Improve Muscle Function in Healthy Older Adults: A Pilot Study. J Aging Res 2019; 2019:7516939. [PMID: 31687210 PMCID: PMC6794984 DOI: 10.1155/2019/7516939] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 08/30/2019] [Accepted: 09/10/2019] [Indexed: 11/17/2022] Open
Abstract
Loss of muscle mass and strength are seemingly accepted as part of the ageing process, despite ultimately leading to the loss of independence. Resistance exercise is considered to be primary defence against loss of muscle function in older age, but it typically requires access to exercise equipment often in a gym environment. This pilot study aimed at examining the effect of a 28-day, unsupervised home-based exercise intervention on indices of leg strength and muscle size in healthy older adults. Twenty participants were randomly assigned to either maintain their habitual physical activity levels (Control; n=10; age, 74 (5) years; body mass, 26.3 (3.5) kg/m2) or undertake "exercise snacks" twice daily (ES; n=10; age, 70 (4) years; body mass, 25.0 (3.4) kg/m2). Both groups consumed 150 g of yogurt at their breakfast meal for the duration of the intervention. Sixty-second sit-to-stand score improved by 31% in ES, with no change in Control (p < 0.01). Large effect sizes were observed for the difference in change scores between the groups for interpolated maximum leg pressing power (6% increase in ES) and thigh muscle cross-sectional area (2% increase in ES). The present pilot data suggest that exercise snacking might be a promising strategy to improve leg muscle function and size in older adults and that further investigation into zero-cost exercise strategies that allow high frequency of training is warranted.
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18
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Owen PJ, Daly RM, Dalla Via J, Mundell NL, Livingston PM, Rantalainen T, Fraser SF. The clinical relevance of adiposity when assessing muscle health in men treated with androgen deprivation for prostate cancer. J Cachexia Sarcopenia Muscle 2019; 10:1036-1044. [PMID: 31067013 PMCID: PMC6818455 DOI: 10.1002/jcsm.12446] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 04/05/2019] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Androgen deprivation therapy (ADT) for prostate cancer (PCa) may prospectively decrease absolute lean mass (LM) and increase absolute fat mass (FM). Given that estimates of LM by dual-energy X-ray absorptiometry may be overestimated in obese people, this study examined the influence of adiposity on muscle health in men treated with ADT for PCa. METHODS This cross-sectional study examined the influence of adiposity on total and appendicular LM (ALM), muscle cross-sectional (CSA), and muscle strength in 70 men treated with ADT [mean (standard deviation) age, 71 (6) years] for PCa compared with age-matched PCa (n = 52) and healthy controls (n = 70). Total body LM, FM and ALM, and 66% tibia and radius muscle CSA were quantified by dual-energy X-ray absorptiometry and peripheral quantitative computed tomography, respectively. ALM was further divided by height (m2 ) or body mass index, with muscle CSA expressed as a per cent of total limb CSA. Upper and lower body and back (three-repetition maximum and dynamometry) muscle strength were expressed per kilogram of body weight. RESULTS On average, ADT-treated men had 4.4-6.4 kg greater FM compared with controls (P ≤ 0.014) and there were no differences in total body or ALM. Total body per cent LM and ALMBMI were 3.8-5.4% (P ≤ 0.001) and 7.8-9.4% (P ≤ 0.001) lower, respectively, in ADT-treated men compared with both controls. Percentage muscle CSA at both sites and muscle strength (except leg) were 3.0-6.0% (P ≤ 0.031) and 15-17% (P ≤ 0.010) lower, respectively, in ADT-treated men compared with both controls. CONCLUSIONS The findings from this study indicate muscle mass, size, and strength are compromised in men treated with ADT after accounting for their increased adiposity or body size.
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Affiliation(s)
- Patrick J. Owen
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityGeelongVictoriaAustralia
| | - Robin M. Daly
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityGeelongVictoriaAustralia
| | - Jack Dalla Via
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityGeelongVictoriaAustralia
| | - Niamh L. Mundell
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityGeelongVictoriaAustralia
| | | | - Timo Rantalainen
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityGeelongVictoriaAustralia
- Gerontology Research Center and Faculty of Sport and Health SciencesUniversity of JyväskyläJyväskyläFinland
| | - Steve F. Fraser
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityGeelongVictoriaAustralia
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19
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Curtis KJ, Oberman AG, Niebur GL. Effects of mechanobiological signaling in bone marrow on skeletal health. Ann N Y Acad Sci 2019; 1460:11-24. [PMID: 31508828 DOI: 10.1111/nyas.14232] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/09/2019] [Accepted: 08/15/2019] [Indexed: 01/27/2023]
Abstract
Bone marrow is a cellular tissue that forms within the pore space and hollow diaphysis of bones. As a tissue, its primary function is to support the hematopoietic progenitor cells that maintain the populations of both erythroid and myeloid lineage cells in the bone marrow, making it an essential element of normal mammalian physiology. However, bone's primary function is load bearing, and deformations induced by external forces are transmitted to the encapsulated marrow. Understanding the effects of these mechanical inputs on marrow function and adaptation requires knowledge of the material behavior of the marrow at multiple scales, the loads that are applied, and the mechanobiology of the cells. This paper reviews the current state of knowledge of each of these factors. Characterization of the marrow mechanical environment and its role in skeletal health and other marrow functions remains incomplete, but research on the topic is increasing, driven by interest in skeletal adaptation and the mechanobiology of cancer metastasis.
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Affiliation(s)
- Kimberly J Curtis
- Tissue Mechanics Laboratory, Bioengineering Graduate Program, University of Notre Dame, Notre Dame, Indiana.,Advanced Diagnostics and Therapeutics Initiative, University of Notre Dame, Notre Dame, Indiana
| | - Alyssa G Oberman
- Tissue Mechanics Laboratory, Bioengineering Graduate Program, University of Notre Dame, Notre Dame, Indiana
| | - Glen L Niebur
- Tissue Mechanics Laboratory, Bioengineering Graduate Program, University of Notre Dame, Notre Dame, Indiana.,Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana.,Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana
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20
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Bone Marrow Fat Physiology in Relation to Skeletal Metabolism and Cardiometabolic Disease Risk in Children With Cerebral Palsy. Am J Phys Med Rehabil 2019; 97:911-919. [PMID: 29894311 DOI: 10.1097/phm.0000000000000981] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Individuals with cerebral palsy exhibit neuromuscular complications and low physical activity levels. Adults with cerebral palsy exhibit a high prevalence of chronic diseases, which is associated with musculoskeletal deficits. Children with cerebral palsy have poor musculoskeletal accretion accompanied by excess bone marrow fat, which may lead to weaker bones. Mechanistic studies to determine the role of bone marrow fat on skeletal growth and maintenance and how it relates to systemic energy metabolism among individuals with cerebral palsy are lacking. In this review, we highlight the skeletal status in children with cerebral palsy and analyze the existing literature on the interactions among bone marrow fat, skeletal health, and cardiometabolic disease risk in the general population. Clinically vital questions are proposed, including the following: (1) Is the bone marrow fat in children with cerebral palsy metabolically distinct from typically developing children in terms of its lipid and inflammatory composition? (2) Does the bone marrow fat suppress skeletal acquisition? (3) Or, does it accelerate chronic disease development in children with cerebral palsy? (4) If so, what are the mechanisms? In conclusion, although inadequate mechanical loading may initiate poor skeletal development, subsequent expansion of bone marrow fat may further impede skeletal acquisition and increase cardiometabolic disease risk in those with cerebral palsy.
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21
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Zebaze R, Osima M, Bui M, Lukic M, Wang X, Ghasem-Zadeh A, Eriksen EF, Vais A, Shore-Lorenti C, Ebeling PR, Seeman E, Bjørnerem Å. Adding Marrow Adiposity and Cortical Porosity to Femoral Neck Areal Bone Mineral Density Improves the Discrimination of Women With Nonvertebral Fractures From Controls. J Bone Miner Res 2019; 34:1451-1460. [PMID: 30883870 DOI: 10.1002/jbmr.3721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 02/24/2019] [Accepted: 03/01/2019] [Indexed: 11/08/2022]
Abstract
Advancing age is accompanied by a reduction in bone formation and remodeling imbalance, which produces microstructural deterioration. This may be partly caused by a diversion of mesenchymal cells towards adipocytes rather than osteoblast lineage cells. We hypothesized that microstructural deterioration would be associated with an increased marrow adiposity, and each of these traits would be independently associated with nonvertebral fractures and improve discrimination of women with fractures from controls over that achieved by femoral neck (FN) areal bone mineral density (aBMD) alone. The marrow adiposity and bone microstructure were quantified from HR-pQCT images of the distal tibia and distal radius in 77 women aged 40 to 70 years with a recent nonvertebral fracture and 226 controls in Melbourne, Australia. Marrow fat measurement from HR-pQCT images was validated using direct histologic measurement as the gold standard, at the distal radius of 15 sheep, with an agreement (R2 = 0.86, p < 0.0001). Each SD higher distal tibia marrow adiposity was associated with 0.33 SD higher cortical porosity, and 0.60 SD fewer, 0.24 SD thinner, and 0.72 SD more-separated trabeculae (all p < 0.05). Adjusted for age and FN aBMD, odds ratios (ORs) (95% CI) for fracture per SD higher marrow adiposity and cortical porosity were OR, 3.39 (95% CI, 2.14 to 5.38) and OR, 1.79 (95% CI, 1.14 to 2.80), respectively. Discrimination of women with fracture from controls improved when cortical porosity was added to FN aBMD and age (area under the receiver-operating characteristic curve [AUC] 0.778 versus 0.751, p = 0.006) or marrow adiposity was added to FN aBMD and age (AUC 0.825 versus 0.751, p = 0.002). The model including FN aBMD, age, cortical porosity, trabecular thickness, and marrow adiposity had an AUC = 0.888. Results were similar for the distal radius. Whether marrow adiposity and cortical porosity indices improve the identification of women at risk for fractures requires validation in prospective studies. © 2019 American Society for Bone and Mineral Research.
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Affiliation(s)
- Roger Zebaze
- Department of Medicine, School of Clinical Sciences, Monash Health, Monash University, Melbourne, Australia.,Departments of Medicine and Endocrinology, Austin Health, University of Melbourne, Melbourne, Australia
| | - Marit Osima
- Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway.,Department of Orthopaedic Surgery, University Hospital of North Norway, Tromsø, Norway
| | - Minh Bui
- Centre for Epidemiology and Biostatistics, School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Marko Lukic
- Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - Xiaofang Wang
- Departments of Medicine and Endocrinology, Austin Health, University of Melbourne, Melbourne, Australia
| | - Ali Ghasem-Zadeh
- Departments of Medicine and Endocrinology, Austin Health, University of Melbourne, Melbourne, Australia
| | - Erik F Eriksen
- Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway.,Department of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Angela Vais
- Hudson Institute for Medical Research, Monash University, Melbourne, Australia
| | - Catherine Shore-Lorenti
- Department of Medicine, School of Clinical Sciences, Monash Health, Monash University, Melbourne, Australia
| | - Peter R Ebeling
- Department of Medicine, School of Clinical Sciences, Monash Health, Monash University, Melbourne, Australia
| | - Ego Seeman
- Departments of Medicine and Endocrinology, Austin Health, University of Melbourne, Melbourne, Australia.,Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Australia
| | - Åshild Bjørnerem
- Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway.,Department of Obstetrics and Gynecology, University Hospital of North Norway, Tromsø, Norway
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22
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Duckham RL, Bialo SR, Machan J, Kriz P, Gordon CM. A case-control pilot study of stress fracture in adolescent girls: the discriminative ability of two imaging technologies to classify at-risk athletes. Osteoporos Int 2019; 30:1573-1580. [PMID: 31143993 DOI: 10.1007/s00198-019-05001-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 04/22/2019] [Indexed: 12/14/2022]
Abstract
UNLABELLED Since stress fractures are common among adolescent athletes, it is important to identify bone assessment tools that accurately identify risk. We investigated the discriminative ability of two imaging technologies to classify at-risk athletes. Findings suggested that peripheral quantitative computed tomography (pQCT) has the ability to distinguish differences in bone structure in injured vs. uninjured limbs. INTRODUCTION Given the high stress fracture (SFX) prevalence among adolescent girls, an understanding of the most informative assessment tools to identify SFX risks are required. We investigated the discriminative ability of pQCT vs. dual-energy X-ray absorptiometry (DXA) to classify athletes with or without SFX. METHODS Twelve adolescent athletes diagnosed with a lower-extremity SFX were compared with 12 matched controls. DXA measured areal bone mineral density (aBMD) and content of the total body, and lumbar spine. Bilateral tibiae were assessed with pQCT. At the metaphysis (3%), total density (ToD), trabecular density (TrD), trabecular area (TrA), and estimated bone strength in compression (BSIc), and at the diaphysis (38% and 66%), total bone area (ToA), cortical density (CoD), cortical area (CoA), estimated bone strength in torsion (SSIp), and peri- and endocortical and muscle area (MuA) were obtained. Cortical bone mass/density around the center of mass and marrow density (estimate of adiposity) were calculated using ImageJ software. General estimated equations adjusting for multiple comparisons (Holm-Bonferroni method) were used to compare means between (1) injured limb of the case athletes vs. uninjured limb of the control athletes and (2) uninjured limb of the case athletes vs. uninjured limbs of the controls and injured vs. uninjured limb of case athletes with a SFX. RESULTS aBMD and content showed no significant differences between cases and controls. When comparing the injured vs. uninjured leg in the case athletes by pQCT at the 3% tibia, unadjusted TrD, total density, and BSIc were significantly lower (p < 0.05) in the injured vs. uninjured leg. Marrow density at the 66% site was 1% (p < 0.05) lower in the injured vs. uninjured leg. CONCLUSIONS These preliminary data in athletes with SFX suggest that pQCT has the ability to distinguish differences in bone structure in injured vs. uninjured limbs. No discriminative bone parameter classifications were identified between adolescent athletes with or without SFX.
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Affiliation(s)
- R L Duckham
- Institute for Physical Activity and Nutrition (IPAN) School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Melbourne, Australia
| | - S R Bialo
- Division of Pediatric Endocrinology, Rhode Island Hospital/Hasbro Children's Hospital, Warren Alpert Medical School of Brown University, Providence, RI, USA
| | - J Machan
- Division of Biostatistics, Rhode Island Hospital, Warren Alpert Medical School of Brown University, Providence, RI, USA
| | - P Kriz
- Division of Sports Medicine, Departments of Orthopedics and Pediatrics, Warren Alpert Medical School Rhode Island Hospital/Hasbro Children's Hospital, Brown University, Providence, RI, USA
| | - C M Gordon
- Division of Adolescent/Young Adult Medicine, Boston Children's Hospital, Boston, MA, USA.
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Esche J, Shi L, Hartmann MF, Schönau E, Wudy SA, Remer T. Glucocorticoids and Body Fat Inversely Associate With Bone Marrow Density of the Distal Radius in Healthy Youths. J Clin Endocrinol Metab 2019; 104:2250-2256. [PMID: 30715368 DOI: 10.1210/jc.2018-02108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 01/25/2019] [Indexed: 01/28/2023]
Abstract
CONTEXT Elevated bone marrow adipose tissue (BMAT) is associated with lower bone quality, higher fracture rates, and an unfavorable overall metabolic profile. Apart from age, particularly glucocorticoids (GC), body fat, and diet are discussed to influence BMAT. We hypothesized that already in healthy youths, higher fat intake, higher fat mass index (FMI), and higher GC secretion, still within the normal range, may associate with increased BMAT. DESIGN In a subsample of healthy 6- to 18-year-old participants of the Dortmund Nutritional and Anthropometric Longitudinally Designed Study, peripheral quantitative CT of the nondominant proximal forearm was used to determine bone marrow density of the distal radius as an inverse surrogate parameter for BMAT. In those participants (n = 172) who had collected two, 24-hour urines within around one year before bone measurement, major urinary GC metabolites were measured by gas chromatography-mass spectrometry and summed up to assess daily adrenal GC secretion (ΣC21). Dietary intake was assessed by 3-day weighed dietary records. FMI was anthropometrically calculated. Separate multiple linear regression models were used to analyze the relationships of ΣC21, FMI, and fat intake with BMAT. RESULTS After controlling for confounders, such as age, energy intake, and forearm muscle area, ΣC21 (β = -0.042) and FMI (β = -0.002) showed inverse relationships with bone marrow density (P < 0.05), whereas fat intake did not associate significantly. CONCLUSION Our results indicate that already a moderately elevated GC secretion and higher body fatness during adolescence may adversely impact BMAT, an indicator for long-term bone health.
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Affiliation(s)
- Jonas Esche
- Dortmund Nutritional and Anthropometric Longitudinally Designed Study Center, Institute of Nutrition and Food Science, Nutritional Epidemiology, University of Bonn, Dortmund, Germany
| | - Lijie Shi
- Dortmund Nutritional and Anthropometric Longitudinally Designed Study Center, Institute of Nutrition and Food Science, Nutritional Epidemiology, University of Bonn, Dortmund, Germany
| | - Michaela F Hartmann
- Steroid Research and Mass Spectrometry Unit, Center of Child and Adolescent Medicine, Justus-Liebig-University, Giessen, Germany
| | - Eckhard Schönau
- Children's Hospital, University of Cologne, Cologne, Germany
| | - Stefan A Wudy
- Steroid Research and Mass Spectrometry Unit, Center of Child and Adolescent Medicine, Justus-Liebig-University, Giessen, Germany
| | - Thomas Remer
- Dortmund Nutritional and Anthropometric Longitudinally Designed Study Center, Institute of Nutrition and Food Science, Nutritional Epidemiology, University of Bonn, Dortmund, Germany
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24
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Masarwi M, DeSchiffart A, Ham J, Reagan MR. Multiple Myeloma and Fatty Acid Metabolism. JBMR Plus 2019; 3:e10173. [PMID: 30918920 PMCID: PMC6419611 DOI: 10.1002/jbm4.10173] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 01/03/2019] [Accepted: 01/13/2019] [Indexed: 12/12/2022] Open
Abstract
Multiple myeloma (MM) accounts for 13% to 15% of all blood cancers1 and is characterized by the proliferation of malignant cells within the bone marrow (BM). Despite important advances in treatment, most patients become refractory and relapse with the disease. As MM tumors grow in the BM, they disrupt hematopoiesis, create monoclonal protein spikes in the blood, initiate systemic organ and immune system shutdown,2 and induce painful osteolytic lesions caused by overactive osteoclasts and inhibited osteoblasts.3, 4 MM cells are also extremely dependent on the BM niche, and targeting the BM niche has been clinically transformative for inhibiting the positive-feedback "vicious cycle" between MM cells and osteoclasts that leads to bone resorption and tumor proliferation.5, 6, 7, 8 Bone marrow adipocytes (BMAs) are dynamic, secretory cells that have complex effects on osteoblasts and tumor cells, but their role in modifying the MM cell phenotype is relatively unexplored.9, 10, 11, 12, 13 Given their active endocrine function, capacity for direct cell-cell communication, correlation with aging and obesity (both MM risk factors), potential roles in bone disease, and physical proximity to MM cells, it appears that BMAs support MM cells.14, 15, 16, 17 This supposition is based on research from many laboratories, including our own. Therapeutically targeting the BMA may prove to be equally transformative in the clinic if the pathways through which BMAs affect MM cells can be determined. In this review, we discuss the potential for BMAs to provide free fatty acids to myeloma cells to support their growth and evolution. We highlight certain proteins in MM cells responsible for fatty acid uptake and oxidation and discuss the potential for therapeutically targeting fatty acid metabolism or BMAs from where they may be derived. © 2019 The Authors. JBMR Plus published by Wiley Periodicals, Inc. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Majdi Masarwi
- Center for Molecular MedicineMaine Medical Center Research InstituteScarboroughMEUSA
| | - Abigail DeSchiffart
- Center for Molecular MedicineMaine Medical Center Research InstituteScarboroughMEUSA
| | - Justin Ham
- Center for Molecular MedicineMaine Medical Center Research InstituteScarboroughMEUSA
| | - Michaela R. Reagan
- Center for Molecular MedicineMaine Medical Center Research InstituteScarboroughMEUSA
- University of Maine Graduate School of Biomedical Science and EngineeringOronoMEUSA
- Sackler School of Graduate Biomedical SciencesTufts UniversityBostonMAUSA
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25
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Paccou J, Penel G, Chauveau C, Cortet B, Hardouin P. Marrow adiposity and bone: Review of clinical implications. Bone 2019; 118:8-15. [PMID: 29477645 DOI: 10.1016/j.bone.2018.02.008] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Revised: 02/09/2018] [Accepted: 02/13/2018] [Indexed: 12/16/2022]
Abstract
There is growing interest in the relationship between bone marrow fat (BMF) and skeletal health. Progress in clinical studies of BMF and skeletal health has been greatly enhanced by recent technical advances in our ability to measure BMF non-invasively. Magnetic resonance imagery (MRI) with or without spectroscopy is currently the standard technique for evaluating BMF content and composition in humans. This review focuses on clinical studies of marrow fat and its relationship with bone. The amount of marrow fat is associated with bone mineral density (BMD). Several studies have reported a significant negative association between marrow fat content and BMD in both healthy and osteoporotic populations. There may also be a relationship between marrow fat and fracture (mostly vertebral fracture), but data are scarce and further studies are needed. Furthermore, a few studies suggest that a lower proportion of unsaturated lipids in vertebral BMF may be associated with reduced BMD and greater prevalence of fracture. Marrow fat might be influenced by metabolic diseases associated with bone loss and fractures, such as diabetes mellitus, obesity and anorexia nervosa. An intriguing aspect of bariatric (weight loss) surgery is that it induces bone loss and fractures, but with different impacts on marrow fat depending on diabetic status. In daily practice, the usefulness for clinicians of assessing marrow fat using MRI is still limited. However, the perspectives are exciting, particularly in terms of improving the diagnosis and management of osteoporosis. Further studies are needed to better understand the regulators involved in the marrow fat-bone relationship and the links between marrow fat, other fat depots and energy metabolism.
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Affiliation(s)
- Julien Paccou
- Université de Lille, Université Littoral Côte d'Opale, PMOI EA 4490 faculté de chirurgie dentaire, place de Verdun, 59000 Lille, France; Service de rhumatologie, CHRU, 59000 Lille, France.
| | - Guillaume Penel
- Université de Lille, Université Littoral Côte d'Opale, PMOI EA 4490 faculté de chirurgie dentaire, place de Verdun, 59000 Lille, France
| | - Christophe Chauveau
- Univ. Littoral Côte d'Opale, Univ. Lille, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-62300 Boulogne-sur-Mer, France
| | - Bernard Cortet
- Université de Lille, Université Littoral Côte d'Opale, PMOI EA 4490 faculté de chirurgie dentaire, place de Verdun, 59000 Lille, France; Service de rhumatologie, CHRU, 59000 Lille, France
| | - Pierre Hardouin
- Univ. Littoral Côte d'Opale, Univ. Lille, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-62300 Boulogne-sur-Mer, France
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26
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Mäkitaipale J, Sievänen H, Laitinen-Vapaavuori O. Tibial bone density, cross-sectional geometry and strength in Finnish pet rabbits: a peripheral quantitative computed tomography study. Vet Rec 2018; 183:382. [DOI: 10.1136/vr.104419] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 03/20/2018] [Accepted: 06/06/2018] [Indexed: 11/04/2022]
Affiliation(s)
- Johanna Mäkitaipale
- Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine; University of Helsinki; Helsinki Finland
| | - Harri Sievänen
- The UKK Institute for Health Promotion Research; Tampere Finland
| | - Outi Laitinen-Vapaavuori
- Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine; University of Helsinki; Helsinki Finland
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27
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Association between insulin resistance and the magnetic resonance spectroscopy-determined marrow fat fraction in nondiabetic postmenopausal women. Menopause 2018; 25:676-682. [DOI: 10.1097/gme.0000000000001063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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28
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Gibbs JC, Brown ZM, Wong AKO, Craven BC, Adachi JD, Giangregorio LM. Measuring Marrow Density and Area Using Peripheral Quantitative Computed Tomography at the Tibia: Precision in Young and Older Adults and Individuals With Spinal Cord Injury. J Clin Densitom 2018; 21:269-280. [PMID: 28359675 DOI: 10.1016/j.jocd.2017.02.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/25/2017] [Accepted: 02/13/2017] [Indexed: 12/15/2022]
Abstract
The objective of this study was to compare the test-retest precision error for peripheral quantitative computed tomography (pQCT)-derived marrow density and marrow area segmentation at the tibia using 3 software packages. A secondary analysis of pQCT data in young adults (n = 18, mean ± standard deviation 25.4 ± 3.2 yr), older adults (n = 47, 71.8 ± 8.2 yr), and individuals with spinal cord injury (C1-T12 American Spinal Injury Association Impairment Scale, classes A-C; n = 19, 43.5 ± 8.6 yr) was conducted. Repeat scans of the tibial shaft (66%) were performed using pQCT (Stratec XCT2000). Test-retest precision errors (root mean square standard deviation and root mean square coefficient of variation [RMSCV%]) for marrow density (mg/cm3) and marrow area (mm2) were reported for the watershed-guided manual segmentation method (SliceOmatic version 4.3 [Sliceo-WS]) and the 2 threshold-based edge detection methods (Stratec version 6.0 [Stratec-TB] and BoneJ version 1.3.14 [BoneJ-TB]). Bland-Altman plots and 95% limits of agreement were computed to evaluate test-retest discrepancies within and between methods of analysis and subgroups. RMSCV% for marrow density segmentation was >5% for all methods across subgroups (Stratec-TB: 12.2%-28.5%, BoneJ-TB: 14.5%-25.2%, and Sliceo-WS: 10.9%-23.0%). RMSCV% for marrow area segmentation was within 5% for all methods across subgroups (Stratec-TB: 1.9%-4.4%, BoneJ-TB: 2.6%-5.1%, and Sliceo-WS: 2.4%-4.5%), except using BoneJ-TB in older adults. Intermethod discrepancies in marrow density appeared to be present across the range of marrow density values and did not differ by subgroup. Intermethod discrepancies varied to a greater extent for marrow area and were found to be more frequently at mid- to higher-range values for those with spinal cord injury. Precision error for pQCT-derived marrow density segmentation exceeded 5% for all methods of analysis across a range of bone mineral densities and fat infiltration, whereas precision error for marrow area segmentation ranged from 2% to 5%. Further investigation is necessary to determine alternative acquisition and analysis methods for pQCT-derived marrow segmentation.
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Affiliation(s)
- Jenna C Gibbs
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada.
| | - Zachary M Brown
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Andy K O Wong
- Joint Department of Medical Imaging, Toronto General Research Institute, University Health Network, Toronto, ON, Canada; Centre of Excellence in Skeletal Health Assessment, Toronto General Research Institute, University Health Network, Toronto, ON, Canada; Arthritis Program, Toronto General Research Institute, University Health Network, Toronto, ON, Canada
| | - B Catharine Craven
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada; Lyndhurst Centre, Toronto Rehabilitation Institute, University Health Network, Toronto, ON, Canada; Department of Medicine, University of Toronto, Toronto, ON, Canada
| | | | - Lora M Giangregorio
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada; Lyndhurst Centre, Toronto Rehabilitation Institute, University Health Network, Toronto, ON, Canada; Schlegel Research Institute for Aging, University of Waterloo, Waterloo, ON, Canada
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Patel VS, Ete Chan M, Rubin J, Rubin CT. Marrow Adiposity and Hematopoiesis in Aging and Obesity: Exercise as an Intervention. Curr Osteoporos Rep 2018; 16:105-115. [PMID: 29476393 PMCID: PMC5866776 DOI: 10.1007/s11914-018-0424-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
PURPOSE OF REVIEW Changes in the bone marrow microenvironment, which accompany aging and obesity, including increased marrow adiposity, can compromise hematopoiesis. Here, we review deleterious shifts in molecular, cellular, and tissue activity and consider the potential of exercise to slow degenerative changes associated with aging and obesity. RECENT FINDINGS While bone marrow hematopoietic stem cells (HSC) are increased in frequency and myeloid-biased with age, the effect of obesity on HSC proliferation and differentiation remains controversial. HSC from both aged and obese environment have reduced hematopoietic reconstitution capacity following bone marrow transplant. Increased marrow adiposity affects HSC function, causing upregulation of myelopoiesis and downregulation of lymphopoiesis. Exercise, in contrast, can reduce marrow adiposity and restore hematopoiesis. The impact of marrow adiposity on hematopoiesis is determined mainly through correlations. Mechanistic studies are needed to determine a causative relationship between marrow adiposity and declines in hematopoiesis, which could aid in developing treatments for conditions that arise from disruptions in the marrow microenvironment.
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Affiliation(s)
- Vihitaben S Patel
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-2580, USA
| | - M Ete Chan
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-2580, USA
| | - Janet Rubin
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Clinton T Rubin
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-2580, USA.
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30
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Scerpella JJ, Buehring B, Hetzel SJ, Heiderscheit BC. Increased Leg Bone Mineral Density and Content During the Initial Years of College Sport. J Strength Cond Res 2018; 32:1123-1130. [PMID: 29570599 DOI: 10.1519/jsc.0000000000001929] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Scerpella, JJ, Buehring, B, Hetzel, SJ, and Heiderscheit, BC. Increased leg bone mineral density and content during the initial years of college sport. J Strength Cond Res 32(4): 1123-1130, 2018-Bone mineral density (BMD) and bone mineral content (BMC) data are useful parameters for evaluating how training practices promote bone health. We used dual-energy X-ray absorptiometry (DXA) to longitudinally assess sport-specific growth in leg and total body BMD/BMC over the initial 2 years of collegiate training. Eighty-five Division 1 collegiate basketball, hockey, and soccer athletes (50 males and 35 females; age 19.0 [0.8] years) underwent annual DXA scans. Leg and total body BMD/BMC were compared within and across two 1-year intervals (periods 1 and 2) using repeated-measures analysis of variance, adjusting for age, sex, race, and sport. Leg BMD, leg BMC, and total body BMC all increased over period 1 (0.05 g·cm [p = 0.001], 0.07 kg [p = 0.002], and 0.19 kg [p < 0.001] respectively). Changes in period 2 compared with period 1 were smaller for leg BMD (p = 0.001), leg BMC (p < 0.001), leg fat mass (p = 0.028), and total BMC (p = 0.005). Leg lean mass increased more during period 2 than period 1 (p = 0.018). Sports participation was the only significant predictor of change in leg BMD. Significant increases in both leg BMD and BMC were demonstrated over both 2-year periods, with greater gains during period 1. These gains highlight the importance of attentive training procedures, capitalizing on attendant physical benefits of increased BMD/BMC. Additional research in young adults, evaluating bone mass acquisition, will optimize performance and decrease risk of bone stress injury among collegiate athletes.
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Affiliation(s)
- John J Scerpella
- Badger Athletic Performance, University of Wisconsin, Madison, WI
| | - Bjoern Buehring
- Osteoporosis Clinical Research Program, University of Wisconsin, Madison, WI
| | - Scott J Hetzel
- Department of Biostatistics and Medical Informatics, University of Wisconsin, Madison, WI
| | - Bryan C Heiderscheit
- Department of Orthopedics and Rehabilitation and Badger Athletic Performance, School of Medicine and Public Health, University of Wisconsin, Madison, WI
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Abstract
Marrow adipocytes, collectively termed marrow adipose tissue (MAT), reside in the bone marrow in close contact to bone cells and haematopoietic cells. Marrow adipocytes arise from the mesenchymal stem cell and share their origin with the osteoblast. Shifts in the lineage allocation of the mesenchymal stromal cell could potentially explain the association between increased MAT and increased fracture risk in diseases such as postmenopausal osteoporosis, anorexia nervosa and diabetes. Functionally, marrow adipocytes secrete adipokines, such as adiponectin, and cytokines, such as RANK ligand and stem cell factor. These mediators can influence both bone remodelling and haematopoiesis by promoting bone resorption and haematopoietic recovery following chemotherapy. In addition, marrow adipocytes can secrete free fatty acids, acting as a energy supply for bone and haematopoietic cells. However, this induced lipolysis is also used by neoplastic cells to promote survival and proliferation. Therefore, MAT could represent a new therapeutic target for multiple diseases from osteoporosis to leukaemia, although the exact characteristics and role of the marrow adipocyte in health and diseases remain to be determined.
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Affiliation(s)
- A G Veldhuis-Vlug
- Department of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, The Netherlands
- Center for Clinical and Translational Research, Maine Medical Center Research Institute, Scarborough, ME, USA
| | - C J Rosen
- Center for Clinical and Translational Research, Maine Medical Center Research Institute, Scarborough, ME, USA
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32
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Abstract
PURPOSE Here, we review the skeletal effects of pediatric muscle disorders as well as muscle impairment in pediatric bone disorders. RECENT FINDINGS When starting in utero, muscle disorders can lead to congenital multiple contractures. Pediatric-onset muscle weakness such as cerebral palsy, Duchenne muscular dystrophy, spinal muscular atrophy, or spina bifida typically are associated with small diameter of long-bone shafts, low density of metaphyseal bone, and increased fracture incidence in the lower extremities, in particular, the distal femur. Primary bone diseases can affect muscles through generic mechanisms, such as decreased physical activity or in disease-specific ways. For example, the collagen defect underlying the bone fragility of osteogenesis imperfecta may also affect muscle force generation or transmission. Transforming growth factor beta released from bone in Camurati Engelman disease may decrease muscle function. FUTURE DIRECTIONS Considering muscle-bone interactions does not only contribute to the understanding of musculoskeletal disorders but also can identify new targets for therapeutic interventions.
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Affiliation(s)
| | - Frank Rauch
- Shriners Hospital for Children, 1003 Boulevard Decarie, Montreal, QC, H4A 0A9, Canada
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33
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Verroken C, Pieters W, Beddeleem L, Goemaere S, Zmierczak HG, Shadid S, Kaufman JM, Lapauw B. Cortical Bone Size Deficit in Adult Patients With Type 1 Diabetes Mellitus. J Clin Endocrinol Metab 2017; 102:2887-2895. [PMID: 28531321 DOI: 10.1210/jc.2017-00620] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 05/15/2017] [Indexed: 01/01/2023]
Abstract
CONTEXT The increased fracture risk associated with type 1 diabetes mellitus (T1DM) remains unexplained by traditional risk factors such as low areal bone mineral density (aBMD). Nonetheless, few data exist on other determinants of bone strength in T1DM, including volumetric bone mineral density (vBMD) and bone geometry. OBJECTIVE We compared areal and volumetric bone parameters and cortical bone geometry in adult T1DM patients and sex- and age-matched controls. DESIGN Cross-sectional study including 64 adult T1DM patients (38 men; mean age, 41.1 ± 8.1 years) and 63 sex- and age-matched controls. MAIN OUTCOME MEASURES Areal bone parameters using dual-energy X-ray absorptiometry; volumetric bone parameters and cortical bone geometry using peripheral quantitative computed tomography. RESULTS T1DM was associated with lower aBMD at the total body, femoral neck, and total hip; lower trabecular vBMD at the distal radius; and higher cortical but lower total vBMD at the radial shaft. In addition, subjects with T1DM had a similar periosteal but larger endosteal circumference, smaller cortical thickness, and lower cortical over total bone area ratio. Differences in bone parameters could not be explained by differences in bone turnover markers or body composition, but cortical area was inversely associated with glycemic variability and long-term glycemic control. CONCLUSIONS Besides decreased aBMD and trabecular vBMD, adult T1DM patients present with a cortical bone size deficit, which may contribute to their increased fracture risk. This deficit is mainly situated at the endosteal envelope, suggesting imbalanced remodeling rather than compromised modeling processes as the underlying mechanism.
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Affiliation(s)
- Charlotte Verroken
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Endocrinology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Wout Pieters
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Endocrinology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Loïc Beddeleem
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Endocrinology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Stefan Goemaere
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
| | - Hans-Georg Zmierczak
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
| | - Samyah Shadid
- Department of Endocrinology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Jean-Marc Kaufman
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Endocrinology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Bruno Lapauw
- Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Endocrinology, Ghent University Hospital, 9000 Ghent, Belgium
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Abstract
Marrow adipose tissue (MAT) is a recently identified endocrine organ capable of modulating a host of responses. Given its intimate proximity to the bone microenvironment, the impact marrow adipocytes exert on bone has attracted much interest and scientific inquiry. Although many questions and controversies remain about marrow adipocytes, multiple conditions/disease states in which alterations occur have provided clues about their function. The consensus is that MAT is associated inversely with bone density and quality. While further investigation is warranted, MAT has clearly been demonstrated as an active dynamic depot that contributes to bone turnover and overall metabolic homeostasis.
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Affiliation(s)
| | - Clifford J Rosen
- Maine Medical Center Research Institute, 81 Research Drive, Scarborough, ME 04074, USA.
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35
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Veldhuis-Vlug AG, Rosen CJ. Mechanisms of marrow adiposity and its implications for skeletal health. Metabolism 2017; 67:106-114. [PMID: 28081773 PMCID: PMC5325679 DOI: 10.1016/j.metabol.2016.11.013] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 11/02/2016] [Accepted: 11/22/2016] [Indexed: 12/11/2022]
Abstract
The bone marrow niche is composed of cells from hematopoietic and mesenchymal origin. Both require energy to power differentiation and these processes are intimately connected to systemic metabolic homeostasis. Glycolysis is the preferred substrate for mesenchymal stromal cells in the niche, although fatty acid oxidation and glutaminolysis are important during stage specific differentiation. Autophagy and lipophagy, in part triggered by adenosine monophosphate-activated protein kinase (AMPK), may also play an important but temporal specific role in osteoblast differentiation. Enhanced marrow adiposity is caused by clinical factors that are genetically, environmentally, and hormonally mediated. These determinants mediate a switch from the osteogenic to the adipogenic lineage. Preliminary evidence supports an important role for fuel utilization in those cell fate decisions. Although both the origin and function of the marrow adipocyte remain to be determined, and in some genetic mouse models high marrow adiposity may co-exist with greater bone mass, in humans changes in marrow adiposity are closely linked to adverse changes in skeletal metabolism. This supports an intimate relationship between bone and fat in the marrow. Future studies will likely shed more light on the relationship of cellular as well as whole body metabolism on the ultimate fate of bone marrow stromal cells.
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Whitney DG, Singh H, Miller F, Barbe MF, Slade JM, Pohlig RT, Modlesky CM. Cortical bone deficit and fat infiltration of bone marrow and skeletal muscle in ambulatory children with mild spastic cerebral palsy. Bone 2017; 94:90-97. [PMID: 27732905 PMCID: PMC5912954 DOI: 10.1016/j.bone.2016.10.005] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 10/02/2016] [Accepted: 10/07/2016] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Nonambulatory children with severe cerebral palsy (CP) have underdeveloped bone architecture, low bone strength and a high degree of fat infiltration in the lower extremity musculature. The present study aims to determine if such a profile exists in ambulatory children with mild CP and if excess fat infiltration extends into the bone marrow. MATERIALS AND METHODS Ambulatory children with mild spastic CP and typically developing children (4 to 11years; 12/group) were compared. Magnetic resonance imaging was used to estimate cortical bone, bone marrow and total bone volume and width, bone strength [i.e., section modulus (Z) and polar moment of inertia (J)], and bone marrow fat concentration in the midtibia, and muscle volume, intermuscular, subfascial, and subcutaneous adipose tissue (AT) volume and intramuscular fat concentration in the midleg. Accelerometer-based activity monitors worn on the ankle were used to assess physical activity. RESULTS There were no group differences in age, height, body mass, body mass percentile, BMI, BMI percentile or tibia length, but children with CP had lower height percentile (19th vs. 50th percentile) and total physical activity counts (44%) than controls (both p<0.05). Children with CP also had lower cortical bone volume (30%), cortical bone width in the posterior (16%) and medial (32%) portions of the shaft, total bone width in the medial-lateral direction (15%), Z in the medial-lateral direction (34%), J (39%) and muscle volume (39%), and higher bone marrow fat concentration (82.1±1.8% vs. 80.5±1.9%), subfascial AT volume (3.3 fold) and intramuscular fat concentration (25.0±8.0% vs. 16.1±3.3%) than controls (all p<0.05). When tibia length was statistically controlled, all group differences in bone architecture, bone strength, muscle volume and fat infiltration estimates, except posterior cortical bone width, were still present (all p<0.05). Furthermore, a higher intermuscular AT volume in children with CP compared to controls emerged (p<0.05). CONCLUSIONS Ambulatory children with mild spastic CP exhibit an underdeveloped bone architecture and low bone strength in the midtibia and a greater infiltration of fat in the bone marrow and surrounding musculature compared to typically developing children. Whether the deficit in the musculoskeletal system of children with CP is associated with higher chronic disease risk and whether the deficit can be mitigated requires further investigation.
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Affiliation(s)
- Daniel G Whitney
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, United States
| | - Harshvardhan Singh
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, United States
| | - Freeman Miller
- Department of Orthopedics, Nemours AI duPont Hospital for Children, Wilmington, DE, United States
| | - Mary F Barbe
- Department of Anatomy and Cell Biology, Temple University School of Medicine, Philadelphia, PA, United States
| | - Jill M Slade
- Department of Radiology, Michigan State University, East Lansing, MI, United States
| | - Ryan T Pohlig
- Biostatistics Core Facility, University of Delaware, Newark, DE, United States
| | - Christopher M Modlesky
- Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, United States.
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To assess differential features of marrow adiposity between postmenopausal women with osteoarthritis and osteoporosis using water/fat MRI. Menopause 2016; 24:105-111. [PMID: 27648658 DOI: 10.1097/gme.0000000000000732] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To assess the differential features of marrow adiposity between osteoarthritis (OA) and osteoporosis (OP) in postmenopausal women using water/fat MRI. METHODS This cross-sectional study included 97 postmenopausal women (OA [n = 25], OA + osteopenia [n = 27], OA + OP [n = 23], and OP groups [n = 22]). Water/fat MRI, dual-energy x-ray absorptiometry and biochemical analysis were performed to assess vertebral marrow fat fraction, bone mineral density, and bone biomarkers, respectively. Harris Hip Score was recorded to evaluate hip function. RESULTS There were significant differences in marrow fat content among the OA, OA + osteopenia, and OA + OP groups, between OP and OA participants with normal bone mass or osteopenia (all P < 0.05); no significant difference was observed between OA + OP and OP groups. Serum levels of leptin and β-Crosslaps in OA with normal bone mass and osteopenic OA groups were higher than in OP group. Marrow fat fraction was inversely correlated with Harris Hip Score (r = -0.371, P = 0.013), bone mineral density (r = -0.554, P = 0.009) and leptin levels (r = -0.610, P < 0.001). In multivariate regression analysis, marrow fat fraction was found to have a consistent and unchanged inverse association with leptin levels (Sβ = -0.311, P = 0.002) and bone mineral density (Sβ = -0.265, P = 0.006) after adjusting for age, years since menopause, and body mass index. CONCLUSIONS Postmenopausal OA with OP have a phenotype with higher marrow adiposity. OA and OP could coexist, for the presence of a specific subgroup of OA with increased marrow fat accumulation and high risk of developing OP.
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Pagnotti GM, Styner M. Exercise Regulation of Marrow Adipose Tissue. Front Endocrinol (Lausanne) 2016; 7:94. [PMID: 27471493 PMCID: PMC4943947 DOI: 10.3389/fendo.2016.00094] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Accepted: 07/04/2016] [Indexed: 12/20/2022] Open
Abstract
Despite association with low bone density and skeletal fractures, marrow adipose tissue (MAT) remains poorly understood. The marrow adipocyte originates from the mesenchymal stem cell (MSC) pool that also gives rise to osteoblasts, chondrocytes, and myocytes, among other cell types. To date, the presence of MAT has been attributed to preferential biasing of MSC into the adipocyte rather than osteoblast lineage, thus negatively impacting bone formation. Here, we focus on understanding the physiology of MAT in the setting of exercise, dietary interventions, and pharmacologic agents that alter fat metabolism. The beneficial effect of exercise on musculoskeletal strength is known: exercise induces bone formation, encourages growth of skeletally supportive tissues, inhibits bone resorption, and alters skeletal architecture through direct and indirect effects on a multiplicity of cells involved in skeletal adaptation. MAT is less well studied due to the lack of reproducible quantification techniques. In recent work, osmium-based 3D quantification shows a robust response of MAT to both dietary and exercise intervention in that MAT is elevated in response to high-fat diet and can be suppressed following daily exercise. Exercise-induced bone formation correlates with suppression of MAT, such that exercise effects might be due to either calorie expenditure from this depot or from mechanical biasing of MSC lineage away from fat and toward bone, or a combination thereof. Following treatment with the anti-diabetes drug rosiglitazone - a PPARγ-agonist known to increase MAT and fracture risk - mice demonstrate a fivefold higher femur MAT volume compared to the controls. In addition to preventing MAT accumulation in control mice, exercise intervention significantly lowers MAT accumulation in rosiglitazone-treated mice. Importantly, exercise induction of trabecular bone volume is unhindered by rosiglitazone. Thus, despite rosiglitazone augmentation of MAT, exercise significantly suppresses MAT volume and induces bone formation. That exercise can both suppress MAT volume and increase bone quantity, notwithstanding the skeletal harm induced by rosiglitazone, underscores exercise as a powerful regulator of bone remodeling, encouraging marrow stem cells toward the osteogenic lineage to fulfill an adaptive need for bone formation. Thus, exercise represents an effective strategy to mitigate the deleterious effects of overeating and iatrogenic etiologies on bone and fat.
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Affiliation(s)
- Gabriel M. Pagnotti
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, USA
| | - Maya Styner
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
- *Correspondence: Maya Styner,
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Huovinen V, Viljakainen H, Hakkarainen A, Saukkonen T, Toiviainen-Salo S, Lundbom N, Lundbom J, Mäkitie O. Bone marrow fat unsaturation in young adults is not affected by present or childhood obesity, but increases with age: A pilot study. Metabolism 2015; 64:1574-81. [PMID: 26388537 DOI: 10.1016/j.metabol.2015.08.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 08/18/2015] [Accepted: 08/22/2015] [Indexed: 01/01/2023]
Abstract
OBJECTIVES Obesity increases bone marrow fat (BMF) content. The association between early obesity and bone marrow fatty acid composition is unknown. We measured BMF unsaturation index (UI) in normal-weight and overweight young adults with a known weight status in early childhood and tested the relationship between BMF UI and exercise history, glycemic state, and other clinical characteristics. METHODS The study included 18 normal-weight (BMI <25 kg/m(2); 2 males, 16 females) and 17 overweight (BMI ≥25 kg/m(2); 9 males, 8 females) young adults aged 15-27 years. BMF UI was assessed with magnetic resonance proton spectroscopy optimized to reduce water interference. Exercise information was obtained with a pedometer accompanied with the history of recent physical activity. Blood samples (insulin, glucose, HbA1c) and body characteristics (BMI, waist-to-hip ratio, body fat composition) were assessed. RESULTS BMF UI was not affected by obesity at the time of study or before age 7 years. BMF UI increased with age in normal-weight and overweight subjects (R=0.408, p=0.015) but did not associate with gender, physical activity or body fat composition; a suggestive association was observed with glucose (R=-0.289, p=0.10). CONCLUSIONS The association of BMF UI with age in early adulthood may represent normal maturation of bone marrow. There was a trend toward an association with blood glucose, warranting further studies.
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Affiliation(s)
- Ville Huovinen
- Turku PET Centre, University of Turku, Turku, Finland; Department of Radiology, Turku University, Medical Imaging Centre of Southwest Finland and Turku University Hospital, Helsinki, Finland
| | - Heli Viljakainen
- Children's Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Antti Hakkarainen
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland
| | - Tero Saukkonen
- Children's Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland; Novo Nordisk Farma Oy, Espoo, Finland
| | - Sanna Toiviainen-Salo
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland
| | - Nina Lundbom
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland
| | - Jesper Lundbom
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland; Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany; German Center for Diabetes Research, Partner Düsseldorf, Düsseldorf, Germany
| | - Outi Mäkitie
- Children's Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland; Folkhälsan Institute of Genetics, Helsinki, Finland; Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden; Department of Molecular Medicine and Surgery, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.
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Paccou J, Hardouin P, Cotten A, Penel G, Cortet B. The Role of Bone Marrow Fat in Skeletal Health: Usefulness and Perspectives for Clinicians. J Clin Endocrinol Metab 2015; 100:3613-21. [PMID: 26244490 DOI: 10.1210/jc.2015-2338] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
CONTEXT There is growing interest in the relationship between bone marrow fat (BMF), bone mineral density (BMD), and fractures. Moreover, BMF might be influenced by metabolic diseases associated with bone loss and fractures, such as type 2 diabetes mellitus (T2DM), anorexia nervosa (AN), and obesity. METHODS The primary-source literature for this review was acquired using a PubMed search for articles published between January 2000 and April 2015. Search terms included BMF, BMD, fractures, T2DM, AN, and obesity. The titles and abstracts of all articles were reviewed for relevant subjects. RESULTS Magnetic resonance imaging, with or without spectroscopy, was used to noninvasively quantify BMF in humans. A negative relationship was found between BMD and BMF in both healthy and osteopenic/osteoporotic populations. Data are lacking on the relationship between BMF and fractures. Studies in populations of individuals with metabolic diseases such as T2DM, AN, and obesity have shown BMF abnormalities. CONCLUSIONS We conclude that most human data demonstrate an inverse relationship between BMF and BMD, but data on the relationship with fractures are inconsistent and need further study. In daily practice, the usefulness for clinicians of assessing BMF using magnetic resonance imaging is still limited. However, the perspectives are exciting, particularly in terms of improving the diagnosis and management of osteoporosis.
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Affiliation(s)
- Julien Paccou
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Pierre Hardouin
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Anne Cotten
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Guillaume Penel
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Bernard Cortet
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
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Singhal V, Maffazioli GDN, Cano Sokoloff N, Ackerman KE, Lee H, Gupta N, Clarke H, Slattery M, Bredella MA, Misra M. Regional fat depots and their relationship to bone density and microarchitecture in young oligo-amenorrheic athletes. Bone 2015; 77:83-90. [PMID: 25868796 PMCID: PMC4447547 DOI: 10.1016/j.bone.2015.04.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Revised: 03/23/2015] [Accepted: 04/02/2015] [Indexed: 11/15/2022]
Abstract
CONTEXT Various fat depots have differential effects on bone. Visceral adipose tissue (VAT) is deleterious to bone, whereas subcutaneous adipose tissue (SAT) has positive effects. Also, marrow adipose tissue (MAT), a relatively newly recognized fat depot is inversely associated with bone mineral density (BMD). Bone mass in athletes depends on many factors including gonadal steroids and muscle mass. Exercise increases muscle mass and BMD, whereas, estrogen deficiency decreases BMD. Thus, the beneficial effects of weight-bearing exercise on areal and volumetric BMD (aBMD and vBMD) in regularly menstruating (eumenorrheic) athletes (EA) are attenuated in oligo-amenorrheic athletes (OA). Of note, data regarding VAT, SAT, MAT and regional muscle mass in OA compared with EA and non-athletes (C), and their impact on bone are lacking. METHODS We used (i) MRI to assess VAT and SAT at the L4 vertebra level, and cross-sectional muscle area (CSA) of the mid-thigh, (ii) 1H-MRS to assess MAT at L4, the proximal femoral metaphysis and mid-diaphysis, (iii) DXA to assess spine and hip aBMD, and (iv) HRpQCT to assess vBMD at the distal radius (non-weight-bearing bone) and tibia (weight-bearing bone) in 41 young women (20 OA, 10 EA and 11 C 18-25 years). All athletes engaged in weight-bearing sports for ≥ 4 h/week or ran ≥ 20 miles/week. MAIN OUTCOME MEASURES VAT, SAT and MAT at L4; CSA of the mid-thigh; MAT at the proximal femoral metaphysis and mid-diaphysis; aBMD, vBMD and bone microarchitecture. RESULTS Groups had comparable age, menarchal age, BMI, VAT, VAT/SAT and spine BMD Z-scores. EA had higher femoral neck BMD Z-scores than OA and C. Fat mass was lowest in OA. SAT was lowest in OA (p = 0.048); L4 MAT was higher in OA than EA (p = 0.03). We found inverse associations of (i) VAT/SAT with spine BMD Z-scores (r = -0.42, p = 0.01), (ii) L4 MAT with spine and hip BMD Z-scores (r = -0.44, p = 0.01; r = -0.36, p = 0.02), and vBMD of the radius and tibia (r = -0.49, p = 0.002; r = -0.41, p = 0.01), and (iii) diaphyseal and metaphyseal MAT with vBMD of the radius (r ≤ -0.42, p ≤ 0.01) and tibia (r ≤ -0.34, p ≤ 0.04). In a multivariate model including VAT/SAT, L4 MAT and thigh CSA, spine and hip BMD Z-scores were predicted inversely by L4 MAT and positively by thigh CSA, and total and cortical radius and total tibial vBMD were predicted inversely by L4 MAT. VAT/SAT did not predict radius or tibia total vBMD in this model, but inversely predicted spine BMD Z-scores. When L4 MAT was replaced with diaphyseal or metaphyseal MAT in the model, diaphyseal and metaphyseal MAT did not predict aBMD Z-scores, but diaphyseal MAT inversely predicted total vBMD of the radius and tibia. These results did not change after adding percent body fat to the model. CONCLUSIONS VAT/SAT is an inverse predictor of lumbar spine aBMD Z-scores, while L4 MAT is an independent inverse predictor of aBMD Z-scores at the spine and hip and vBMD measures at the distal tibia and radius in athletes and non-athletes. Diaphyseal MAT independently predicts vBMD measures of the distal tibia and radius.
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Affiliation(s)
- Vibha Singhal
- Pediatric Endocrine Unit, Massachusetts General Hospital for Children and Harvard Medical School, 175 Cambridge Street, Boston, MA 02114, USA; Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Giovana D N Maffazioli
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Natalia Cano Sokoloff
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Kathryn E Ackerman
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA; Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Avenue, Boston, MA 02115, USA.
| | - Hang Lee
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, USA.
| | - Nupur Gupta
- Department of Adolescent Medicine, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Hannah Clarke
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Meghan Slattery
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Miriam A Bredella
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
| | - Madhusmita Misra
- Pediatric Endocrine Unit, Massachusetts General Hospital for Children and Harvard Medical School, 175 Cambridge Street, Boston, MA 02114, USA; Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
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Frank-Wilson AW, Johnston JD, Olszynski WP, Kontulainen SA. Measurement of muscle and fat in postmenopausal women: precision of previously reported pQCT imaging methods. Bone 2015; 75:49-54. [PMID: 25659205 DOI: 10.1016/j.bone.2015.01.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 01/14/2015] [Accepted: 01/26/2015] [Indexed: 11/17/2022]
Abstract
Peripheral quantitative computed tomography (pQCT) imaging has been used to quantify muscle area and density as well as intermuscular adipose tissue (IMAT) and subcutaneous adipose tissue (SAT) area in the lower and upper limb. Numerous protocols have been reported to derive these soft-tissue outcomes, but their precision has not been assessed in community-dwelling postmenopausal women. The objective of this study was to compare the precision of previously reported analysis protocols for quantifying muscle area and density, as well as IMAT and SAT area in postmenopausal women. Six image analysis protocols using two available software suites (Stratec XCT, BoneJ) were identified from the pQCT literature. Analysis protocols were applied to a sample of 35 older female adults (mean age 73.7; SD 7.2 years), randomly selected from a population based-cohort and scanned twice within an average of 9.7 (SD 3.6) days. Relative precision was calculated as absolute values and as a percentage of the sample mean (root mean square coefficient of variation; CV%RMS). Soft-tissue outcomes across protocols were compared on their log-transformed coefficients of variation using multilevel linear models and Tukey contrasts. For most protocols, CV%RMS for muscle area, density, and SAT area ranged between 2.1 and 3.7%, 0.7 and 1.9%, and 2.4 and 6.4%, respectively. Precision for IMAT area varied considerably, from 3 to 42%. Consideration of these study results will aid in the selection of appropriate image analysis protocols for pQCT-derived soft-tissue outcomes in postmenopausal women.
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Affiliation(s)
| | - James D Johnston
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, Canada
| | - Wojciech P Olszynski
- College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada; Saskatoon Osteoporosis and CaMos Centre, Saskatoon, SK, Canada
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Abstract
Obesity markedly increases susceptibility to a range of diseases and simultaneously undermines the viability and fate selection of haematopoietic stem cells (HSCs), and thus the kinetics of leukocyte production that is critical to innate and adaptive immunity. Considering that blood cell production and the differentiation of HSCs and their progeny is orchestrated, in part, by complex interacting signals emanating from the bone marrow microenvironment, it is not surprising that conditions that disturb bone marrow structure inevitably disrupt both the numbers and lineage-fates of these key blood cell progenitors. In addition to the increased adipose burden in visceral and subcutaneous compartments, obesity causes a marked increase in the size and number of adipocytes encroaching into the bone marrow space, almost certainly disturbing HSC interactions with neighbouring cells, which include osteoblasts, osteoclasts, mesenchymal cells and endothelial cells. As the global obesity pandemic grows, the short-term and long-term consequences of increased bone marrow adiposity on HSC lineage selection and immune function remain uncertain. This Review discusses the differentiation and function of haematopoietic cell populations, the principal physicochemical components of the bone marrow niche, and how this environment influences HSCs and haematopoiesis in general. The effect of adipocytes and adiposity on HSC and progenitor cell populations is also discussed, with the goal of understanding how obesity might compromise the core haematopoietic system.
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Affiliation(s)
- Benjamin J Adler
- Department of Biomedical Engineering, Bioengineering Building, Stony Brook University, Stony Brook, NY 11794-5281, USA
| | - Kenneth Kaushansky
- Department of Medicine, Health Sciences Centre, Stony Brook University, Stony Brook, NY 11794-8430, USA
| | - Clinton T Rubin
- Department of Biomedical Engineering, Bioengineering Building, Stony Brook University, Stony Brook, NY 11794-5281, USA
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Styner M, Thompson WR, Galior K, Uzer G, Wu X, Kadari S, Case N, Xie Z, Sen B, Romaine A, Pagnotti GM, Rubin CT, Styner MA, Horowitz MC, Rubin J. Bone marrow fat accumulation accelerated by high fat diet is suppressed by exercise. Bone 2014; 64:39-46. [PMID: 24709686 PMCID: PMC4041820 DOI: 10.1016/j.bone.2014.03.044] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 02/17/2014] [Accepted: 03/25/2014] [Indexed: 01/14/2023]
Abstract
Marrow adipose tissue (MAT), associated with skeletal fragility and hematologic insufficiency, remains poorly understood and difficult to quantify. We tested the response of MAT to high fat diet (HFD) and exercise using a novel volumetric analysis, and compared it to measures of bone quantity. We hypothesized that HFD would increase MAT and diminish bone quantity, while exercise would slow MAT acquisition and promote bone formation. Eight week-old female C57BL/6 mice were fed a regular (RD) or HFD, and exercise groups were provided voluntary access to running wheels (RD-E, HFD-E). Femoral MAT was assessed by μCT (lipid binder osmium) using a semi-automated approach employing rigid co-alignment, regional bone masks and was normalized for total femoral volume (TV) of the bone compartment. MAT was 2.6-fold higher in HFD relative to RD mice. Exercise suppressed MAT in RD-E mice by more than half compared with RD. Running similarly inhibited MAT acquisition in HFD mice. Exercise significantly increased bone quantity in both diet groups. Thus, HFD caused significant accumulation of MAT; importantly running exercise limited MAT acquisition while promoting bone formation during both diets. That MAT is exquisitely responsive to diet and exercise, and its regulation by exercise appears to be inversely proportional to effects on exercise induced bone formation, is relevant for an aging and sedentary population.
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Affiliation(s)
- Maya Styner
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA.
| | - William R Thompson
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Kornelia Galior
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Gunes Uzer
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Xin Wu
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Sanjay Kadari
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Natasha Case
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Zhihui Xie
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Buer Sen
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Andrew Romaine
- Department of Psychiatry and Computer Science, University of North Carolina, Chapel Hill, NC, USA
| | - Gabriel M Pagnotti
- Department of Biomedical Engineering, State University of New York, Stony Brook, NY, USA
| | - Clinton T Rubin
- Department of Biomedical Engineering, State University of New York, Stony Brook, NY, USA
| | - Martin A Styner
- Department of Computer Science, University of North Carolina, Chapel Hill, NC, USA; Department of Psychiatry and Computer Science, University of North Carolina, Chapel Hill, NC, USA
| | - Mark C Horowitz
- Department of Orthopedics and Rehabilitation, Yale University, New Haven, CT, USA
| | - Janet Rubin
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
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Lecka-Czernik B, Stechschulte LA. Bone and fat: a relationship of different shades. Arch Biochem Biophys 2014; 561:124-9. [PMID: 24956594 DOI: 10.1016/j.abb.2014.06.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 06/10/2014] [Accepted: 06/12/2014] [Indexed: 12/21/2022]
Abstract
Environmental and behavioral changes which occurred over the last century led simultaneously to a remarkable increase in human lifespan and to the development of health problems associated with functional impairment of organs either regulating or dependent on balanced energy metabolism. Diseases such as diabetes, obesity and osteoporosis are prevalent in our society and pose major challenges with respect to the overall health and economy. Therefore, better understanding of regulatory axes between bone and fat may provide the basis for development of strategies which will treat these diseases simultaneously and improve health and life quality of elderly.
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Affiliation(s)
- Beata Lecka-Czernik
- Department of Orthopaedic Surgery, University of Toledo Health Science Campus, Toledo, OH 43614, United States; Department of Physiology and Pharmacology, University of Toledo Health Science Campus, Toledo, OH 43614, United States; Center for Diabetes and Endocrine Research, University of Toledo Health Science Campus, Toledo, OH 43614, United States.
| | - Lance A Stechschulte
- Department of Orthopaedic Surgery, University of Toledo Health Science Campus, Toledo, OH 43614, United States; Center for Diabetes and Endocrine Research, University of Toledo Health Science Campus, Toledo, OH 43614, United States
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47
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Cervinka T, Sievänen H, Hyttinen J, Rittweger J. Bone loss patterns in cortical, subcortical, and trabecular compartments during simulated microgravity. J Appl Physiol (1985) 2014; 117:80-8. [PMID: 24812642 DOI: 10.1152/japplphysiol.00021.2014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Disuse studies provide a useful model for bone adaptation. A direct comparison of these studies is, however, complicated by the different settings used for bone analysis. Through pooling and reanalysis of bone data from previous disuse studies, we determined bone loss and recovery in cortical, subcortical, and trabecular compartments and evaluated whether the study design modulated skeletal adaptation. Peripheral quantitative tomographic (pQCT) images from control groups of four disuse studies with a duration of 24, 35, 56, and 90 days were reanalyzed using a robust threshold-free segmentation algorithm. The pQCT data were available from 27 young healthy men at baseline, and at specified intervals over disuse and reambulation phases. The mean maximum absolute bone loss (mean ± 95% CI) was 6.1 ± 4.5 mg/mm in cortical, 2.4 ± 1.6 mg/mm in subcortical, and 9.8 ± 9.1 mg/mm in trabecular compartments, after 90 days of bed rest. The percentage changes in all bone compartments were, however, similar. During the first few weeks after onset of reambulation, the bone loss rate was systematically greater in the cortical than in the trabecular compartment (P < 0.002), and this was observed in all studies except for the longest study. We conclude that disuse-induced bone losses follow similar patterns irrespective of study design, and the largest mean absolute bone loss occurs in the cortical compartment, but apparently only during the first 60 days. With longer study duration, trabecular loss may become more prominent.
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Affiliation(s)
- Tomas Cervinka
- Department of Electronics and Communications Engineering, Tampere University of Technology, Tampere, Finland; Institute of Bioscience and Medical Technology, Tampere, Finland;
| | | | - Jari Hyttinen
- Department of Electronics and Communications Engineering, Tampere University of Technology, Tampere, Finland; Institute of Bioscience and Medical Technology, Tampere, Finland
| | - Jörn Rittweger
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany; and Institute for Biomedical Research into Human Movement and Health, Manchester Metropolitan University, Manchester, United Kingdom
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Li GW, Xu Z, Chen QW, Tian YN, Wang XY, Zhou L, Chang SX. Quantitative evaluation of vertebral marrow adipose tissue in postmenopausal female using MRI chemical shift-based water–fat separation. Clin Radiol 2014; 69:254-62. [PMID: 24286935 DOI: 10.1016/j.crad.2013.10.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Revised: 09/30/2013] [Accepted: 10/04/2013] [Indexed: 12/13/2022]
Affiliation(s)
- G-W Li
- Department of Radiology, Yueyang Hospital of Integrated Traditional Chinese & Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Z Xu
- Medico-Technical Department, Xin-Zhuang Community Health Service Center, Shanghai, China
| | - Q-W Chen
- Department of Integrated Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Y-N Tian
- Department of Radiology, Yueyang Hospital of Integrated Traditional Chinese & Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - X-Y Wang
- Department of Radiology, Yueyang Hospital of Integrated Traditional Chinese & Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - L Zhou
- Department of Radiology, Yueyang Hospital of Integrated Traditional Chinese & Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - S-X Chang
- Department of Radiology, Yueyang Hospital of Integrated Traditional Chinese & Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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Sikiö M, Harrison LCV, Nikander R, Ryymin P, Dastidar P, Eskola HJ, Sievänen H. Influence of exercise loading on magnetic resonance image texture of thigh soft tissues. Clin Physiol Funct Imaging 2013; 34:370-6. [DOI: 10.1111/cpf.12107] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 10/30/2013] [Indexed: 12/19/2022]
Affiliation(s)
- Minna Sikiö
- Department of Radiology; Medical Imaging Center and Hospital Pharmacy; Tampere University Hospital; Tampere Finland
- Department of Electronics and Communications Engineering; Tampere University of Technology; Tampere Finland
| | - Lara C. V. Harrison
- Department of Electronics and Communications Engineering; Tampere University of Technology; Tampere Finland
- Department of Anaesthesia; Tampere University Hospital; Tampere Finland
| | - Riku Nikander
- Department of Health Sciences; University of Jyväskylä; Tampere Finland
- GeroCenter Foundation for Aging Research and Development; Jyväskylä Finland
- Jyväskylä Central Hospital; Jyväskylä Finland
| | - Pertti Ryymin
- Department of Radiology; Medical Imaging Center and Hospital Pharmacy; Tampere University Hospital; Tampere Finland
| | - Prasun Dastidar
- Department of Radiology; Medical Imaging Center and Hospital Pharmacy; Tampere University Hospital; Tampere Finland
- Tampere Medical School; University of Tampere; Tampere Finland
| | - Hannu J. Eskola
- Department of Radiology; Medical Imaging Center and Hospital Pharmacy; Tampere University Hospital; Tampere Finland
- Department of Electronics and Communications Engineering; Tampere University of Technology; Tampere Finland
| | - Harri Sievänen
- Bone Research Group; UKK Intstitute for Health Promotion Research; Tampere Finland
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