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Introduction
There is immense current interest in the effects of thyroid hormones on bone. This is largely due to concern that patients on thyroxine replacement therapy are at increased risk of developing osteoporosis; this concern follows a number of reports describing reduced bone mineral density in this group of patients. The issue is, however, uncertain and the purpose of this review is (i) to summarize what is known about the effects of thyroid hormones on bone at both an experimental and clinical level and (ii) to try to reach a greater understanding of the problem and its implications for patient management.
Bone biology
Bone remodelling requires the tightly coupled actions of osteoclasts and osteoblasts. A normal bone remodelling cycle takes approximately 200 days. Each cycle begins with activation of cells which become osteoclasts and start resorbing bone. This phase lasts for about 50 days and is terminated
Skeletal Biology Laboratory, Center for Healthy Aging Research, Department of Neuroscience, Biostatistics, Department of Physiological Sciences, Department of Large Animal Clinical Sciences, Maine Medical Center Research Institute, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon 97331, USA
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Skeletal Biology Laboratory, Center for Healthy Aging Research, Department of Neuroscience, Biostatistics, Department of Physiological Sciences, Department of Large Animal Clinical Sciences, Maine Medical Center Research Institute, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon 97331, USA
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this approach can induce weight loss and/or maintain lower body weight in aging rodents with normal circulating levels of the hormone ( Shapiro et al . 2008 ). In humans, calorie restriction-induced weight loss is often associated with bone loss
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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Sophisticated Analytical Instrument Facility & Research, Division, CSIR-Central Drug Research Institute, Lucknow, India
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Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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Sophisticated Analytical Instrument Facility & Research, Division, CSIR-Central Drug Research Institute, Lucknow, India
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Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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Introduction Osteoporosis is a major medical and socioeconomic problem among elderly people, particularly affecting postmenopausal women. Impaired bone mass, strength and deterioration of bone microarchitecture are consequences associated with
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Department of Veterinary Basic Sciences, INSERM, CNRS, Université Paris Decartes, INSERM, Department of Endocrinology, Royal Veterinary College, Royal College Street, London NW1 0TU, UK
Department of Veterinary Basic Sciences, INSERM, CNRS, Université Paris Decartes, INSERM, Department of Endocrinology, Royal Veterinary College, Royal College Street, London NW1 0TU, UK
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anabolic pathways that consume ATP. In the last few years, several in vitro and in vivo studies have established that the AMPK signalling pathway could also play a role in bone physiology ( Kanazawa et al . 2008 , 2009 , Kasai et al . 2009 , Lee
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Introduction Longitudinal bone growth occurs at the growth plate by a process called endochondral ossification where a continuously formed cartilage template is substituted by newly formed bone tissue ( Kronenberg 2003 , Chagin & Savendahl 2007
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calcification. In journal articles, the terms ‘calcification’ and ‘mineralisation’ are used interchangeably. Nonetheless, mineralisation is most often used in the context of bone and refers to the process of laying down minerals within an extracellular matrix
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Introduction Osteoporosis is a disease characterized by a decrease in bone mass and deterioration in bone structure with a consequent increase in bone fragility and risk of fracture. The bone loss is most related to estrogen deficiency and age- and
Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
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Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
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Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
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Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
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Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
Felsenstein Medical Research Center, Sackler Faculty of Medicine, Robert H. Smith Faculty of Agriculture, Faculty of Agricultural, The Jesse Z and Sara Lea Shafer Institute for Endocrinology and Diabetes, Petach Tikva, Israel
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. 2002 ). The skeleton undergoes rapid structural adaptations to the demands of the growing body, manifested by elongation and bone modeling, together with changes in the bone mineral composition, cortical and trabecular architecture, and altered
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Department of Endocrinology and Metabolism, Concord Repatriation General Hospital, Sydney, Australia
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-body physiology, highlighting the role of bone as an endocrine organ ( Pierce et al. 2019 , 2022 ). Additionally, the GR has distinct actions in bone loss, fracture healing, and arthritis, which are dependent on sex, ageing, the disease context, cell type, and
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Introduction Estrogen (17β-estradiol) is an important regulator of bone metabolism, which is illustrated by the low bone mass phenotype in a man carrying a mutation in estrogen receptor-α (ERα; Smith et al . 1994 ) and in individuals with a