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Dvořáková K, Paludo AC, Wagner A, Puda D, Gimunová M, Kumstát M. A literature review of biomarkers used for diagnosis of relative energy deficiency in sport. Front Sports Act Living 2024; 6:1375740. [PMID: 39070233 PMCID: PMC11273787 DOI: 10.3389/fspor.2024.1375740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 06/17/2024] [Indexed: 07/30/2024] Open
Abstract
Introduction The review aims to summarize the markers used in diagnosing relative energy deficiency in sport (REDs) and compare them with the REDs CAT2 score. Methods A systematic search was performed in the PubMed, Web of Science, and SPORTDiscus databases during April 2023. The descriptors used were "athlete" AND "REDs," along with respective entry terms. The selection process followed the PRISMA 2020 recommendations, identifying 593 records, from which 13 studies were ultimately selected. Seventy-nine markers were identified and categorized into six groups: bone mineral density (BMD), metabolic resting rate, blood biomarkers, anthropometrics, nutritional intake, and performance parameters. The most frequently utilized biomarkers included BMD, anthropometric parameters (e.g., body mass index, body mass, and fat mass), and the triiodothyronine (T3) concentration. Results According to the REDs CAT2 pointed indicators, the biomarkers varied among the studies, while 7 out of the 13 included studies achieved a ≥60% agreement rate with this tool. The prevalence of low energy availability, an etiological factor in the development of REDs, was detected in 4 out of 13 studies, with an average of 39.5%. Conclusion In conclusion, this review highlights the most commonly used markers in diagnosing REDs, such as BMD, anthropometric parameters, and T3 hormone concentration. Due to the current inconsistencies, standardizing diagnostic methodologies is crucial for future research. By focusing on widely used markers, this review aids future research planning and result interpretation and points out the ongoing need for methodological consistency in evolving diagnostic tools. Systematic Review Registration https://www.crd.york.ac.uk/, PROSPERO (CRD42022320007).
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Affiliation(s)
- Kristýna Dvořáková
- Department of Sport Performance and Exercise Testing, Faculty of Sports Studies, Masaryk University, Brno, Czechia
| | - Ana Carolina Paludo
- Department of Sport Performance and Exercise Testing, Faculty of Sports Studies, Masaryk University, Brno, Czechia
| | - Adam Wagner
- Department of Sport Performance and Exercise Testing, Faculty of Sports Studies, Masaryk University, Brno, Czechia
| | - Dominik Puda
- Department of Sport Performance and Exercise Testing, Faculty of Sports Studies, Masaryk University, Brno, Czechia
| | - Marta Gimunová
- Department of Physical Activities and Health Sciences, Faculty of Sports Studies, Masaryk University, Brno, Czechia
| | - Michal Kumstát
- Department of Sport Performance and Exercise Testing, Faculty of Sports Studies, Masaryk University, Brno, Czechia
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Hönes GS, Geist D, Wenzek C, Pfluger PT, Müller TD, Aguilar-Pimentel JA, Amarie OV, Becker L, Dragano N, Garrett L, Hölter SM, Rathkolb B, Rozman J, Spielmann N, Treise I, Wolf E, Wurst W, Fuchs H, Gailus-Durner V, Hrabe de Angelis M, Führer D, Moeller LC. Comparative Phenotyping of Mice Reveals Canonical and Noncanonical Physiological Functions of TRα and TRβ. Endocrinology 2024; 165:bqae067. [PMID: 38889231 DOI: 10.1210/endocr/bqae067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 05/14/2024] [Accepted: 06/07/2024] [Indexed: 06/20/2024]
Abstract
Thyroid hormone (TH) effects are mediated through TH receptors (TRs), TRα1, TRβ1, and TRβ2. The TRs bind to the DNA and regulate expression of TH target genes (canonical signaling). In addition, they mediate activation of signaling pathways (noncanonical signaling). Whether noncanonical TR action contributes to the spectrum of TH effects is largely unknown. The aim of this study was to attribute physiological effects to the TR isoforms and their canonical and noncanonical signaling. We conducted multiparameter phenotyping in male and female TR knockout mice (TRαKO, TRβKO), mice with disrupted canonical signaling due to mutations in the TR DNA binding domain (TRαGS, TRβGS), and their wild-type littermates. Perturbations in senses, especially hearing (mainly TRβ with a lesser impact of TRα), visual acuity, retinal thickness (TRα and TRβ), and in muscle metabolism (TRα) highlighted the role of canonical TR action. Strikingly, selective abrogation of canonical TR action often had little phenotypic consequence, suggesting that noncanonical TR action sufficed to maintain the wild-type phenotype for specific effects. For instance, macrocytic anemia, reduced retinal vascularization, or increased anxiety-related behavior were only observed in TRαKO but not TRαGS mice. Noncanonical TRα action improved energy utilization and prevented hyperphagia observed in female TRαKO mice. In summary, by examining the phenotypes of TRα and TRβ knockout models alongside their DNA binding-deficient mutants and wild-type counterparts, we could establish that the noncanonical actions of TRα and TRβ play a crucial role in modulating sensory, behavioral, and metabolic functions and, thus, contribute to the spectrum of physiological TH effects.
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Affiliation(s)
- Georg Sebastian Hönes
- Department of Endocrinology, Diabetes and Metabolism and Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Essen 45147, Germany
| | - Daniela Geist
- Department of Endocrinology, Diabetes and Metabolism and Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Essen 45147, Germany
| | - Christina Wenzek
- Department of Endocrinology, Diabetes and Metabolism and Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Essen 45147, Germany
| | - Paul Thomas Pfluger
- Research Unit NeuroBiology of Diabetes, Helmholtz Zentrum München, Neuherberg 85764, Germany
- Institute for Diabetes and Obesity, Helmholtz Zentrum München, Neuherberg 85764, Germany
- German Center for Diabetes Research, Neuherberg 85764, Germany
- Division of Neurobiology of Diabetes, TUM School of Medicine, Technical University of Munich, Munich 80333, Germany
| | - Timo Dirk Müller
- Institute for Diabetes and Obesity, Helmholtz Zentrum München, Neuherberg 85764, Germany
- German Center for Diabetes Research, Neuherberg 85764, Germany
- Walther-Straub Institute of Pharmacology and Toxicology, Ludwig-Maximilians-University (LMU) Munich, Munich 80336, Germany
| | - Juan Antonio Aguilar-Pimentel
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Oana Veronica Amarie
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Lore Becker
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Natalia Dragano
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Lillian Garrett
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Sabine Maria Hölter
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Birgit Rathkolb
- German Center for Diabetes Research, Neuherberg 85764, Germany
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, Ludwig-Maximilians University (LMU) Munich, Munich 81377, Germany
| | - Jan Rozman
- German Center for Diabetes Research, Neuherberg 85764, Germany
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Nadine Spielmann
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Irina Treise
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Eckhard Wolf
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, Ludwig-Maximilians University (LMU) Munich, Munich 81377, Germany
| | - Wolfgang Wurst
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
- German Center for Neurodegenerative Diseases (DZNE), Munich 80336, Germany
- Chair of Developmental Genetics, TUM School of Life Sciences, Technical University of Munich, Freising 85354, Germany
| | - Helmut Fuchs
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Valerie Gailus-Durner
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Martin Hrabe de Angelis
- German Center for Diabetes Research, Neuherberg 85764, Germany
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
- Chair of Experimental Genetics, TUM School of Life Science Weihenstephan, Technical University of Munich, Freising 85354, Germany
| | - Dagmar Führer
- Department of Endocrinology, Diabetes and Metabolism and Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Essen 45147, Germany
| | - Lars Christian Moeller
- Department of Endocrinology, Diabetes and Metabolism and Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Essen 45147, Germany
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Kuliczkowska-Płaksej J, Zdrojowy-Wełna A, Jawiarczyk-Przybyłowska A, Gojny Ł, Bolanowski M. Diagnosis and therapeutic approach to bone health in patients with hypopituitarism. Rev Endocr Metab Disord 2024; 25:513-539. [PMID: 38565758 DOI: 10.1007/s11154-024-09878-w] [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] [Accepted: 03/17/2024] [Indexed: 04/04/2024]
Abstract
The results of many studies in recent years indicate a significant impact of pituitary function on bone health. The proper function of the pituitary gland has a significant impact on the growth of the skeleton and the appearance of sexual dimorphism. It is also responsible for achieving peak bone mass, which protects against the development of osteoporosis and fractures later in life. It is also liable for the proper remodeling of the skeleton, which is a physiological mechanism managing the proper mechanical resistance of bones and the possibility of its regeneration after injuries. Pituitary diseases causing hypofunction and deficiency of tropic hormones, and thus deficiency of key hormones of effector organs, have a negative impact on the skeleton, resulting in reduced bone mass and susceptibility to pathological fractures. The early appearance of pituitary dysfunction, i.e. in the pre-pubertal period, is responsible for failure to achieve peak bone mass, and thus the risk of developing osteoporosis in later years. This argues for the need for a thorough assessment of patients with hypopituitarism, not only in terms of metabolic disorders, but also in terms of bone disorders. Early and properly performed treatment may prevent patients from developing the bone complications that are so common in this pathology. The aim of this review is to discuss the physiological, pathophysiological, and clinical insights of bone involvement in pituitary disease.
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Affiliation(s)
- Justyna Kuliczkowska-Płaksej
- Department and Clinic of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Wybrzeże Pasteura 4, Wrocław, 50-367, Poland
| | - Aleksandra Zdrojowy-Wełna
- Department and Clinic of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Wybrzeże Pasteura 4, Wrocław, 50-367, Poland
| | - Aleksandra Jawiarczyk-Przybyłowska
- Department and Clinic of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Wybrzeże Pasteura 4, Wrocław, 50-367, Poland.
| | - Łukasz Gojny
- Department and Clinic of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Wybrzeże Pasteura 4, Wrocław, 50-367, Poland
| | - Marek Bolanowski
- Department and Clinic of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Wybrzeże Pasteura 4, Wrocław, 50-367, Poland
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Zeng J, Li L, Wei D. Association between thymic hyperplasia and serum calcium level in Graves' disease. BMC Endocr Disord 2024; 24:15. [PMID: 38281931 PMCID: PMC10823656 DOI: 10.1186/s12902-024-01541-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 01/17/2024] [Indexed: 01/30/2024] Open
Abstract
BACKGROUND Graves' disease increases bone resorption in hyperthyroidism, leading to elevated serum calcium levels and a negative bone balance. Thymic hyperplasia is observed in some Graves' disease patients. What's more, there have been a few reports of increased serum calcium and severe osteoporosis induced by Graves' disease with thymic hyperplasia. It remains unclear whether Graves' disease with thymic hyperplasia is associated with higher serum calcium levels. Our study aimed to investigate the possibility of elevated serum calcium levels and aggravated bone mobilization in Graves' disease patients with thymic hyperplasia. METHODS Newly diagnosed and untreated patients with Graves' disease (n = 96) were enrolled. They were divided into two groups based on the incidental detection of thymic hyperplasia during imaging. Albumin, alkaline phosphatase, calcium, free triiodothyronine, free thyroxine, thyroid-stimulating hormone, and thyrotrophin receptor antibody (TRAb) were measured, and a computerized tomography of the chest was obtained. RESULTS Patients with Graves' disease who had thymic hyperplasia were notably younger (P=0.018) and exhibited higher serum calcium levels (P=0.001) compared to those with Graves' disease without thymic hyperplasia. In the multiple regression analysis, thymic hyperplasia, TRAb, and female gender were significant variables associated with elevated serum calcium levels in patients with Graves' disease, collectively accounting for 31.7% of the variation in serum calcium. CONCLUSIONS Graves' disease patients with thymic hyperplasia showed higher serum calcium levels. thymic hyperplasia, TRAb, and female gender were found to be correlated with increased serum calcium levels in Graves' disease, suggesting a potential association between thymic hyperplasia and bone mobilization in Graves' disease.
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Affiliation(s)
- Jing Zeng
- Department of Endocrinology and Metabolism, The Second People's Hospital of Chengdu, No.10 Qingyunan Street, Jinjiang District, Chengdu, 610017, China
- Department of General Internal Medicine, West China Second University Hospital, Sichuan University, No.20, Section 3, Ren Min Nan Lu, 610041, Chengdu, China
| | - Lan Li
- Department of Endocrinology and Metabolism, The Second People's Hospital of Chengdu, No.10 Qingyunan Street, Jinjiang District, Chengdu, 610017, China
- Medical Examination Center, The Second People's Hospital of Chengdu, No.10 Qingyunan Street, Jinjiang District, Chengdu, 610017, China
| | - Dong Wei
- Department of Endocrinology and Metabolism, The Second People's Hospital of Chengdu, No.10 Qingyunan Street, Jinjiang District, Chengdu, 610017, China.
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Pang Y, Zhu S, Xu J, Su C, Wu B, Zhang C, Gao J. Myeloid Cells As a Promising Target for Brain-Bone Degenerative Diseases from a Metabolic Point of View. Adv Biol (Weinh) 2023; 7:e2200321. [PMID: 36750967 DOI: 10.1002/adbi.202200321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/11/2023] [Indexed: 02/09/2023]
Abstract
Brain and bone degenerative diseases such as Alzheimer's disease and osteoporosis are common in the aging population and lack efficient pharmacotherapies. Myeloid cells are a diverse group of mononuclear cells that plays important roles in development, immune defense, and tissue homeostasis. Aging drastically alters the expansion and function of myeloid cells, which might be a common pathogenesis of the brain-bone degenerative diseases. From this perspective, the role of myeloid cells in brain-bone degenerative diseases is discussed, with a particular focus on metabolic alterations in myeloid cells. Furthermore, targeting myeloid cells through metabolic regulation via drugs such as metformin and melatonin is proposed as a potential therapy for the clinical treatment of brain-bone diseases.
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Affiliation(s)
- Yidan Pang
- Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.600, Yishan Road, Shanghai, Shanghai, 200233, China
| | - Siyuan Zhu
- Department of General Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.600, Yishan Road, Shanghai, Shanghai, 200233, China
| | - Jun Xu
- Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.600, Yishan Road, Shanghai, Shanghai, 200233, China
| | - Cuimin Su
- Jinjiang Municipal Hospital (Shanghai Sixth People's Hospital Fujian), No. 16, Luoshan Section, Jinguang Road, Luoshan Street, Jinjiang City, Quanzhou, Fujian, 362200, China
| | - Bo Wu
- Department of General Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.600, Yishan Road, Shanghai, Shanghai, 200233, China
| | - Changqing Zhang
- Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.600, Yishan Road, Shanghai, Shanghai, 200233, China
| | - Junjie Gao
- Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.600, Yishan Road, Shanghai, Shanghai, 200233, China
- Jinjiang Municipal Hospital (Shanghai Sixth People's Hospital Fujian), No. 16, Luoshan Section, Jinguang Road, Luoshan Street, Jinjiang City, Quanzhou, Fujian, 362200, China
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Sirsat TS, Sirsat SKG, Price ER, Pineda M, Dzialowski EM. Manipulating plasma thyroid hormone levels alters development of endothermy and ventilation in nestling red-winged blackbirds. Front Physiol 2022; 13:1027257. [PMID: 36523554 PMCID: PMC9745037 DOI: 10.3389/fphys.2022.1027257] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 11/14/2022] [Indexed: 03/14/2024] Open
Abstract
Thyroid hormones are key regulators of development and metabolism in vertebrates. During the nestling period, young of altricial species transition from an ectothermic phenotype to an endothermic phenotype. Red-winged blackbirds are an altricial species that exhibit an increase in plasma 3,3', 5-triiodo-L-thyronine (T3) levels during the first 5 days post-hatch (dph), begin to develop endothermic metabolic responses by 7 dph, and fledge within 10 days of hatching. We propose that thyroid hormones play an important role in regulating development of endothermy during the nestling period in altricial birds. To better understand the effects of thyroid hormones on endothermic metabolic development in an altricial species, we treated nestling red-winged blackbirds on 2, 3, and 5 dph with either methimazole (MMI) to induce hypothyroidism or supplemental T3 to induce hyperthyroidism. We then measured on 5, 7, and 9 dph morphology and whole animal O2 consumption (V ˙ o 2 ) and ventilation in the thermal neutral zone and during gradual cooling. Treatment of nestlings with MMI resulted in lower plasma T3 levels on 5 dph that recovered by 7 dph, while supplementing with T3 did not affect plasma T3 levels on 5, 7 and 9 dph. Treatment with MMI resulted in smaller nestlings with smaller hearts and structural characters such as wing chord and femur length, but larger lungs and kidneys. Treatment with T3 produced smaller nestlings with smaller body masses and shorter femur and tarsus lengths. The development ofV ˙ o 2 and ventilation endothermic responses to gradual cooling in MMI treated nestlings were delayed when compared with control nestlings. In 9 dph nestlings, hypothyroidism resulted in alterations in the responses of ventilation frequency and tidal volume to cooling when compared with the control nestlings. Supplemental T3 had no effect on the development ofV ˙ o 2 and ventilation in the thermal neutral zone or in response to cooling. Our data suggest plasma thyroid hormone levels play an active role in the systemic development of endothermic capacity and the development of ventilatory control. In the nestling avian, multiple systems develop in concert to produce an endothermic phenotype, but reduced thyroid hormone delays maturation of endothermic capacity.
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Affiliation(s)
- Tushar S. Sirsat
- Department of Physician Assistant Studies, Clarkson University, Potsdam, NY, United States
- Developmental Integrative Biology, Department of Biological Sciences, University of North Texas, Denton, TX, United States
| | - Sarah K. G. Sirsat
- Developmental Integrative Biology, Department of Biological Sciences, University of North Texas, Denton, TX, United States
- Department of Biology, SUNY Potsdam, Potsdam, NY, United States
| | - Edwan R. Price
- Developmental Integrative Biology, Department of Biological Sciences, University of North Texas, Denton, TX, United States
- Green Godwit Consulting, Cleveland, OH, United States
| | - Megan Pineda
- Developmental Integrative Biology, Department of Biological Sciences, University of North Texas, Denton, TX, United States
- FUJIFILM Diosynth Biotechnologies Texas, College Station, TX, United States
| | - Edward M. Dzialowski
- Developmental Integrative Biology, Department of Biological Sciences, University of North Texas, Denton, TX, United States
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Hönes GS, Sivakumar RG, Hoppe C, König J, Führer D, Moeller LC. Cell-Specific Transport and Thyroid Hormone Receptor Isoform Selectivity Account for Hepatocyte-Targeted Thyromimetic Action of MGL-3196. Int J Mol Sci 2022; 23:ijms232213714. [PMID: 36430194 PMCID: PMC9691000 DOI: 10.3390/ijms232213714] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/31/2022] [Accepted: 11/04/2022] [Indexed: 11/09/2022] Open
Abstract
Thyroid hormones (THs) and TH receptor-beta (TRβ) reduce hepatic triglycerides, indicating a therapeutic potential for TH analogs in liver steatosis. To avoid adverse extrahepatic, especially TRα-mediated effects such as tachycardia and bone loss, TH analogs with combined TRβ and hepatocyte specificity are desired. MGL-3196 is a new TH analog that supposedly meets these criteria. Here, we characterize the thyromimetic potential of MGL-3196 in cell-based assays and address its cellular uptake requirements. We studied the contribution of liver-specific organic anion transporters (OATP)1B1 and 1B3 to MGL-3196 action. The TR isoform-specific efficacy of MGL-3196 compared with 3,5,3'-triiodothyronine (T3) was determined with luciferase assays and gene expression analysis in OATP1B1 and OATP1B3 and TRα- or TRβ-expressing cells and in primary murine hepatocytes (PMHs) from wild-type and TRβ knockout mice. We measured the oxygen consumption rate to compare the effects of MGL-3196 and T3 on mitochondrial respiration. We identified OATP1B1 as the primary transporter for MGL-3196. MGL-3196 had a high efficacy (90% that of T3) in activating TRβ, while the activation of TRα was only 25%. The treatment of PMHs with T3 and MGL-3196 at EC50 resulted in a similar induction of Dio1 and repression of Serpina7. In HEK293 cells stably expressing OATP1B1, MGL-3196 had comparable effects on mitochondrial respiration as T3. These data indicate that MGL-3196's hepatic thyromimetic action, the basis for its therapeutic use, results from a combination of hepatocyte-specific transport by OATP1B1 and the selective activation of TRβ over TRα.
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Affiliation(s)
- Georg Sebastian Hönes
- Department of Endocrinology, Diabetes and Metabolism, Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Ramona Gowry Sivakumar
- Department of Endocrinology, Diabetes and Metabolism, Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Christoph Hoppe
- Department of Endocrinology, Diabetes and Metabolism, Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Jörg König
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Fahrstr. 17, 91054 Erlangen, Germany
| | - Dagmar Führer
- Department of Endocrinology, Diabetes and Metabolism, Division of Laboratory Research, University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Lars Christian Moeller
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Fahrstr. 17, 91054 Erlangen, Germany
- Correspondence: ; Tel.: +49-201-723-6401
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Pleić N, Brdar D, Gunjača I, Babić Leko M, Torlak V, Punda A, Polašek O, Hayward C, Zemunik T. Thyroid Hormones Are Not Associated with Plasma Osteocalcin Levels in Adult Population with Normal Thyroid Function. Metabolites 2022; 12:metabo12080719. [PMID: 36005591 PMCID: PMC9412351 DOI: 10.3390/metabo12080719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/01/2022] [Accepted: 08/02/2022] [Indexed: 02/05/2023] Open
Abstract
Thyroid hormones (THs) play an indispensable role in skeletal development and bone remodeling. Some studies have reported associations of THs with serum osteocalcin (OC) levels, but the results are quite inconsistent and the molecular mechanism of their simultaneous or interdependent activity on bone is almost unknown. Therefore, the aim of this study was to determine the possible associations of plasma THs with plasma OC levels and the possible mediating effect of OC on the relationship between THs and bone mineral density (BMD). For this purpose, out of the initial 1981 participants, we selected healthy euthyroid participants controlled for available confounding factors that can affect thyroid function and bone metabolism (N = 694). Given our results, we could not confirm any associations of THs with plasma OC levels nor the mediating effect of OC on the relationship between THs and BMD in euthyroid population. In the group of women controlled for menopause status (N = 396), we found a significant negative association of body mass index (BMI) with OC levels (β = −0.14, p = 0.03). We also found a negative association of free triiodothyronine (fT3) (β = −0.01, p = 0.02) and age (β = −0.003, p < 0.001) with BMD, and a positive association of BMI (β = 0.004, p < 0.001) and male gender (β = 0.1, p < 0.001) with BMD. In addition, we found significantly higher plasma OC levels and lower values of BMD in postmenopausal euthyroid women compared with premenopausal euthyroid women. In our opinion, the results of previous studies suggesting an association between circulating THs and serum OC levels may be influenced by an inconsistent selection of participants and the influence of confounding factors.
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Affiliation(s)
- Nikolina Pleić
- Department of Medical Biology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Dubravka Brdar
- Department of Nuclear Medicine, University Hospital Split, Spinčićeva 1, 21000 Split, Croatia
| | - Ivana Gunjača
- Department of Medical Biology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Mirjana Babić Leko
- Department of Medical Biology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Vesela Torlak
- Department of Nuclear Medicine, University Hospital Split, Spinčićeva 1, 21000 Split, Croatia
| | - Ante Punda
- Department of Nuclear Medicine, University Hospital Split, Spinčićeva 1, 21000 Split, Croatia
| | - Ozren Polašek
- Department of Public Health, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
| | - Caroline Hayward
- MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Tatijana Zemunik
- Department of Medical Biology, School of Medicine, University of Split, Šoltanska 2, 21000 Split, Croatia
- Correspondence:
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Rodrigues BM, Mathias LS, Deprá IDC, Cury SS, de Oliveira M, Olimpio RMC, De Sibio MT, Gonçalves BM, Nogueira CR. Effects of Triiodothyronine on Human Osteoblast-Like Cells: Novel Insights From a Global Transcriptome Analysis. Front Cell Dev Biol 2022; 10:886136. [PMID: 35784485 PMCID: PMC9248766 DOI: 10.3389/fcell.2022.886136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 05/06/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Thyroid hormones play a significant role in bone development and maintenance, with triiodothyronine (T3) particularly being an important modulator of osteoblast differentiation, proliferation, and maintenance. However, details of the biological processes (BPs) and molecular pathways affected by T3 in osteoblasts remain unclear.Methods: To address this issue, primary cultures of human adipose-derived mesenchymal stem cells were subjected to our previously established osteoinduction protocol, and the resultant osteoblast-like cells were treated with 1 nm or 10 nm T3 for 72 h. RNA sequencing (RNA-Seq) was performed using the Illumina platform, and differentially expressed genes (DEGs) were identified from the raw data using Kallisto and DESeq2. Enrichment analysis of DEGs was performed against the Gene Ontology Consortium database for BP terms using the R package clusterProfiler and protein network analysis by STRING.Results: Approximately 16,300 genes were analyzed by RNA-Seq, with 343 DEGs regulated in the 1 nm T3 group and 467 upregulated in the 10 nm T3 group. Several independent BP terms related to bone metabolism were significantly enriched, with a number of genes shared among them (FGFR2, WNT5A, WNT3, ROR2, VEGFA, FBLN1, S1PR1, PRKCZ, TGFB3, and OSR1 for 1nM T3; and FZD1, SMAD6, NOG, NEO1, and ENG for 10 nm T3). An osteoblast-related search in the literature regarding this set of genes suggests that both T3 doses are unfavorable for osteoblast development, mainly hindering BMP and canonical and non-canonical WNT signaling.Conclusions: Therefore, this study provides new directions toward the elucidation of the mechanisms of T3 action on osteoblast metabolism, with potential future implications for the treatment of endocrine-related bone pathologies.
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Affiliation(s)
- Bruna Moretto Rodrigues
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Lucas Solla Mathias
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Igor de Carvalho Deprá
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Sarah Santiloni Cury
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, Brazil
| | - Miriane de Oliveira
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | | | - Maria Teresa De Sibio
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Bianca Mariani Gonçalves
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Célia Regina Nogueira
- Department of Internal Medicine, Medical School Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
- *Correspondence: Célia Regina Nogueira,
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10
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Block BR, Collins JJ, Rios JC, Mazzola CA. Maternal Levothyroxine Treatment as an Etiologic Factor in the Development of Infantile Craniosynostosis. JOURNAL OF FETAL MEDICINE 2022. [DOI: 10.1007/s40556-022-00337-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Torrejon-Moya A, Izquierdo-Gómez K, Pérez-Sayáns M, Jané-Salas E, Marí Roig A, López-López J. Patients with Thyroid Disorder, a Contraindication for Dental Implants? A Systematic Review. J Clin Med 2022; 11:jcm11092399. [PMID: 35566524 PMCID: PMC9102443 DOI: 10.3390/jcm11092399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/16/2022] [Accepted: 04/22/2022] [Indexed: 01/25/2023] Open
Abstract
The thyroid gland is composed of the thyroid follicles, considered to be the functional units of the thyroid gland. The synthesis of the thyroid hormones occurs in these follicles. Triiodothyronine (T3) and thyroxine (T4) are the thyroid hormones and affect metabolic processes all through the body. This systematic evaluation was performed to answer the following PICO question: “Can patients with thyroid disorders undergo dental implant rehabilitation with the same survival rate as patients without thyroid disorders?”. A systematic review of the literature was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statements to gather available and current evidence of thyroid disorders and its relationship with dental implants. The electronic search, in the PubMed and Cochrane databases, yielded 22 articles. Out of the 22 articles, only 11 fulfilled the inclusion criteria. Manual research of the reference list yielded no additional papers. According to the SORT criteria and answering our PICO question, level B can be established to conclude that patients with thyroid disorders can be rehabilitated with dental implants, with similar survival rates as patients without thyroid disorders. Papers with higher scientific evidence and bigger sample size should be carried out.
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Affiliation(s)
- Aina Torrejon-Moya
- Department of Odontoestomatology, Faculty of Medicine and Health Sciences, School of Dentistry, University Campus of Bellvitge, University of Barcelona, 08907 Barcelona, Spain; (A.T.-M.); (K.I.-G.); (E.J.-S.)
- Oral Health and Masticatory System Group, IDIBELL (Bellvitge Biomedical Research Institute), University of Barcelona, 08907 Barcelona, Spain
| | - Keila Izquierdo-Gómez
- Department of Odontoestomatology, Faculty of Medicine and Health Sciences, School of Dentistry, University Campus of Bellvitge, University of Barcelona, 08907 Barcelona, Spain; (A.T.-M.); (K.I.-G.); (E.J.-S.)
- Oral Health and Masticatory System Group, IDIBELL (Bellvitge Biomedical Research Institute), University of Barcelona, 08907 Barcelona, Spain
| | - Mario Pérez-Sayáns
- Oral Medicine, Oral Surgery and Implantology Unit (MedOralRes), School of Medicine and Dentistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - Enric Jané-Salas
- Department of Odontoestomatology, Faculty of Medicine and Health Sciences, School of Dentistry, University Campus of Bellvitge, University of Barcelona, 08907 Barcelona, Spain; (A.T.-M.); (K.I.-G.); (E.J.-S.)
- Oral Health and Masticatory System Group, IDIBELL (Bellvitge Biomedical Research Institute), University of Barcelona, 08907 Barcelona, Spain
| | - Antonio Marí Roig
- Department of Maxillofacial Surgery, Bellvitge University Hospital, L’Hospitalet de Llobregrat, 08907 Barcelona, Spain;
| | - José López-López
- Department of Odontoestomatology, Faculty of Medicine and Health Sciences, School of Dentistry, University Campus of Bellvitge, University of Barcelona, 08907 Barcelona, Spain; (A.T.-M.); (K.I.-G.); (E.J.-S.)
- Oral Health and Masticatory System Group, IDIBELL (Bellvitge Biomedical Research Institute), University of Barcelona, 08907 Barcelona, Spain
- Correspondence:
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12
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Ran B, Wei F, Gong J, Xu H. Application and prospect of trabecular bone score in differentiated thyroid cancer patients receiving thyrotropin suppression therapy. Front Endocrinol (Lausanne) 2022; 13:1004962. [PMID: 36313757 PMCID: PMC9596913 DOI: 10.3389/fendo.2022.1004962] [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: 07/27/2022] [Accepted: 09/26/2022] [Indexed: 11/13/2022] Open
Abstract
Thyroid-stimulating hormone (TSH) suppression therapy is one of the common treatments for most patients with differentiated thyroid cancer (DTC). Unfortunately, its detrimental effects on bone health are receiving increasing attention. It may increase the risk of osteoporosis and osteoporotic fractures. The trabecular bone score (TBS) is a relatively new gray-scale texture measurement parameter that reflects bone microarchitecture and bone strength and has been shown to independently predict fracture risk. We reviewed for the first time the scientific literature on the use of TBS in DTC patients on TSH suppression therapy and aim to analyze and compare the utility of TBS with bone mass strength (BMD) in the management of skeletal health and prediction of fracture risk. We screened a total of seven relevant publications, four of which were for postmenopausal female patients and three for all female patients. Overall, postmenopausal female patients with DTC had lower TBS and a significant reduction in TBS after receiving TSH suppression therapy, but their BMD did not appear to change significantly. In addition, TBS was also found to be an independent predictor of osteoporotic fracture risk in postmenopausal women with DTC receiving TSH suppression therapy. However, due to limitations in the number of studies and study populations, this evidence is not sufficient to fully demonstrate the adverse effects of TSH suppression therapy on patients' TBS or BMD and the efficacy of TBS, and subsequent larger and more case-cohort studies are needed to further investigate the relationship and application of TBS to TSH suppression therapy in terms of skeletal health impairment and fracture risk in DTC patients.
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13
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Kapri D, Fanibunda SE, Vaidya VA. Thyroid hormone regulation of adult hippocampal neurogenesis: Putative molecular and cellular mechanisms. VITAMINS AND HORMONES 2021; 118:1-33. [PMID: 35180924 DOI: 10.1016/bs.vh.2021.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Adult hippocampal neurogenesis is sensitive to perturbations in thyroid hormone signaling, with evidence supporting a key role for thyroid hormone and thyroid hormone receptors (TRs) in the regulation of postmitotic progenitor survival and neuronal differentiation. In this book chapter we summarize the current understanding of the effects of thyroid hormone signaling on adult hippocampal progenitor development, and also critically address the role of TRs in regulation of distinct aspects of stage-specific hippocampal progenitor progression. We highlight actions of thyroid hormone on thyroid hormone responsive target genes, and the implications for hippocampal progenitor regulation. Given the influence of thyroid hormone on both mitochondrial and lipid metabolism, we discuss a putative role for regulation of metabolism in the effects of thyroid hormone on adult hippocampal neurogenesis. Finally, we highlight specific ideas that require detailed experimental investigation, and the need for future studies to obtain a deeper mechanistic insight into the influence of thyroid hormone and TRs in the developmental progression of adult hippocampal progenitors.
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Affiliation(s)
- Darshana Kapri
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, India
| | - Sashaina E Fanibunda
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, India; Medical Research Centre, Kasturba Health Society, Mumbai, India
| | - Vidita A Vaidya
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, India.
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14
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Kaur N, Suryanarayanan R. Levothyroxine sodium pentahydrate tablets - formulation considerations. J Pharm Sci 2021; 110:3743-3756. [PMID: 34384799 DOI: 10.1016/j.xphs.2021.08.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/05/2021] [Accepted: 08/05/2021] [Indexed: 12/16/2022]
Abstract
Even though levothyroxine sodium pentahydrate tablets have been in the market since 1955, there continue to be recalls due to sub potency. We have comprehensively reviewed the factors affecting its stability in solid oral dosage forms. A compilation of marketed formulation compositions enabled the identification of the potential 'problem excipients'. Two excipient properties, hygroscopicity and microenvironmental acidity, appeared to be responsible for inducing drug instability. In drug products, depending on the formulation composition and storage conditions, the pentahydrate can dehydrate to highly reactive levothyroxine sodium monohydrate, or undergo salt disproportionation to the free acid form of the drug. The USP assay method (HPLC based) is insensitive to these different physical forms of the drug. The influence of physical form of levothyroxine on its chemical stability is incompletely understood. The USP has five product-specific dissolution tests reflecting the complexity in its evaluation.
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Affiliation(s)
- Navpreet Kaur
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota-Twin Cities, 9-177 WDH, 308 Harvard Street Southeast, Minneapolis, Minnesota 55455, United States
| | - Raj Suryanarayanan
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota-Twin Cities, 9-177 WDH, 308 Harvard Street Southeast, Minneapolis, Minnesota 55455, United States.
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15
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Lee HS, Rho JG, Kum CD, Lim JS, Hwang JS. Low Bone Mineral Density at Initial Diagnosis in Children and Adolescents with Graves' Disease. J Clin Densitom 2021; 24:275-280. [PMID: 32546346 DOI: 10.1016/j.jocd.2020.05.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/10/2020] [Accepted: 05/13/2020] [Indexed: 10/24/2022]
Abstract
Previous studies have reported reduced bone mineral density (BMD) in patients with hyperthyroidism. We assessed the association of BMD in children and adolescents with Graves' disease (GD) after correcting for potential confounders affecting BMD such as age, sex, and pubertal status. Forty-four children and adolescents with GD and 172 age- and sex-matched healthy controls were enrolled in this study. We analyzed auxological features, BMD, and levels of thyroid hormone, thyroid-stimulating hormone, and thyroid autoantibodies. We measured BMD by dual-energy X-ray absorptiometry at the time of diagnosis in all patients. The mean age of all patients with GD (9 boys and 32 girls) was 12.1 ± 2.2 years (range, 7.0-16.0). Their initial mean free T4 and thyroid-stimulating hormone levels were 3.51 ± 1.56 ng/dL and 0.04 ± 0.03 IU/L, respectively. The mean BMD Z-scores of the lumbar spine (LS), femoral neck, and total body less head of patients with GD were significantly lower than those of control subjects. Eleven patients (26.8%) had low bone density (LS BMD Z-scores < -2.0). To identify correlations of patient characteristics with BMD Z-scores at each site, alkaline phosphatase had a significant negative correlation with BMD Z-scores at LS and femoral neck, but not total body less head (r = -0.441; p = 0.004 and r = -0.351; p = 0.025, respectively). Children and adolescents with newly diagnosed GD had lower bone mass than their healthy peers. These results suggest that BMD measurement at initial evaluation may be necessary in this population.
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Affiliation(s)
- Hae Sang Lee
- Department of Pediatrics, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea
| | - Jung Gi Rho
- Department of Pediatrics, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea
| | - Chang Dae Kum
- Department of Pediatrics, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea
| | - Jung Sub Lim
- Department of Pediatrics, Korea Cancer Center Hospital, Seoul, Republic of Korea
| | - Jin Soon Hwang
- Department of Pediatrics, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea.
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16
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Cellini M, Rotondi M, Tanda ML, Piantanida E, Chiovato L, Beck-Peccoz P, Lania A, Mazziotti G. Skeletal health in patients with differentiated thyroid carcinoma. J Endocrinol Invest 2021; 44:431-442. [PMID: 32696339 DOI: 10.1007/s40618-020-01359-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 07/09/2020] [Indexed: 02/06/2023]
Abstract
Osteoporosis and fractures are important comorbidities in patients with differentiated thyroid cancer (DTC), with potential negative impact on quality of life and survival. The main determinant of skeletal fragility in DTC is the thyrotropin (TSH)-suppressive therapy, which is commonly recommended to prevent disease's recurrence, especially in patients with structural incomplete response after thyroid surgery and radio-iodine therapy. TSH-suppressive therapy can stimulate bone resorption with consequent bone loss, deterioration of bone microstructure and high risk of fragility fractures. The skeletal effects of TSH-suppressive therapy may be amplified when thyroid cancer cells localize to the skeleton inducing alterations in bone remodelling, impairment of bone structure and further increase in risk of fractures. The management of skeletal fragility in DTC may be challenging, since prediction of fractures is a matter of uncertainty and data on effectiveness and safety of bone-active agents in this clinical setting are still scanty. This review deals with pathophysiological, clinical and therapeutic aspects of skeletal fragility of patients with DTC.
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Affiliation(s)
- M Cellini
- Endocrinology, Diabetology and Andrology Unit, Humanitas Clinical and Research Center, IRCCS, via Manzoni 56, 20089, Rozzano, Milan, Italy
| | - M Rotondi
- Unit of Internal Medicine and Endocrinology, Laboratory for Endocrine Disruptors, Istituti Clinici Scientifici Maugeri IRCCS, 27100, Pavia, Italy
- Department of Internal Medicine and Therapeutics, University of Pavia, 27100, Pavia, Italy
| | - M L Tanda
- Department of Medicine and Surgery, Endocrine Unit, University of Insubria, ASST Dei Sette Laghi, Viale Borri, 57, 21100, Varese, Italy
| | - E Piantanida
- Department of Medicine and Surgery, Endocrine Unit, University of Insubria, ASST Dei Sette Laghi, Viale Borri, 57, 21100, Varese, Italy
| | - L Chiovato
- Unit of Internal Medicine and Endocrinology, Laboratory for Endocrine Disruptors, Istituti Clinici Scientifici Maugeri IRCCS, 27100, Pavia, Italy
- Department of Internal Medicine and Therapeutics, University of Pavia, 27100, Pavia, Italy
| | - P Beck-Peccoz
- University of Milan, Via Pietro Custodi 16, 20136, Milan, Italy
| | - Andrea Lania
- Endocrinology, Diabetology and Andrology Unit, Humanitas Clinical and Research Center, IRCCS, via Manzoni 56, 20089, Rozzano, Milan, Italy.
- Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4 Pieve Emanuele, 20090, Milan, Italy.
| | - G Mazziotti
- Endocrinology, Diabetology and Andrology Unit, Humanitas Clinical and Research Center, IRCCS, via Manzoni 56, 20089, Rozzano, Milan, Italy
- Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4 Pieve Emanuele, 20090, Milan, Italy
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17
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Comparison of Vitamin D Levels, Bone Metabolic Marker Levels, and Bone Mineral Density among Patients with Thyroid Disease: A Cross-Sectional Study. Diagnostics (Basel) 2020; 10:diagnostics10121075. [PMID: 33322284 PMCID: PMC7763871 DOI: 10.3390/diagnostics10121075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/28/2020] [Accepted: 12/08/2020] [Indexed: 02/05/2023] Open
Abstract
Thyroid hormones have a catabolic effect on bone homeostasis. Hence, this study aimed to evaluate serum vitamin D, calcium, and phosphate and bone marker levels and bone mineral density (BMD) among patients with different thyroid diseases. This cross-sectional study included patients with underlying thyroid diseases (n = 64, hyperthyroid; n = 53 euthyroid; n = 18, hypothyroid) and healthy controls (n = 64). BMD was assessed using z-score and left hip and lumbar bone density (g/cm2). The results showed that the mean serum vitamin D Levels of all groups was low (<50 nmol/L). Thyroid patients had higher serum vitamin D levels than healthy controls. All groups had normal serum calcium and phosphate levels. The carboxy terminal collagen crosslink and procollagen type I N-terminal propeptide levels were high in hyperthyroid patients and low in hypothyroid patients. The z-score for hip and spine did not significantly differ between thyroid patients and control groups. The hip bone density was remarkably low in the hyperthyroid group. In conclusion, this study showed no correlation between serum 25(OH)D levels and thyroid diseases. The bone markers showed a difference between thyroid groups with no significant difference in BMD.
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18
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Kim WJ, Bang YR, Kang JW, Yoo JH, Kim SH, Park JH. Preliminary Investigation of Association between Methylphenidate and Serum Growth Markers in Children with Attention-Deficit/Hyperactivity Disorder: A Cross-Sectional Case-Control Study. Soa Chongsonyon Chongsin Uihak 2020; 31:154-160. [PMID: 32665759 PMCID: PMC7350546 DOI: 10.5765/jkacap.200014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/09/2020] [Accepted: 06/15/2020] [Indexed: 11/10/2022] Open
Abstract
Objectives It remains unclear whether methylphenidate (MPH) has yadverse effects on growth in children. This study aimed to investigate the association of MPH with serum biological markers of growth in children with attention-deficit/hyperactivity disorder (ADHD). Methods The present study included 103 children with ADHD (64 drug-naive children, 39 MPH-treated children) and 112 control subjects. Children with ADHD were diagnosed on the basis of a semi-structured interview. Levels of biochemical markers of growth, including insulin-like growth factor-I, thyroid stimulating hormone (TSH), free T4, calcium, phosphorus, alkaline phosphatase, vitamin D, hemoglobin, total protein, albumin, total cholesterol, and hematocrit were measured in these individuals. Results Except in case of TSH, no intergroup differences were found in the levels of the growth markers. The levels of TSH were found to be lower in the MPH-treated boys with ADHD than in the drug-naive and control groups (p < 0.05), although the levels of TSH in all the groups were within normal limits. Conclusion In this cross-sectional study, no significant association was found between MPH and growth markers. This calls for the need to carry out prospective longitudinal research studies in the future that investigate the effect of MPH on the growth trajectory in children.
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Affiliation(s)
- Woo Jin Kim
- Department of Psychiatry, Dong-A University Graduate School of Medicine, Busan, Korea
| | - Young Rong Bang
- Department of Psychiatry, Dong-A University Hospital, Busan, Korea
| | - Je-Wook Kang
- Department of Psychiatry, Inje University Busan Paik Hospital, Busan, Korea
| | - Jae Ho Yoo
- Department of Pediatrics, Dong-A University Hospital, Busan, Korea
| | - Seong Hwan Kim
- Department of Psychiatry, Dong-A University Hospital, Busan, Korea
| | - Jae Hong Park
- Department of Psychiatry, Dong-A University Hospital, Busan, Korea
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Delitala AP, Scuteri A, Doria C. Thyroid Hormone Diseases and Osteoporosis. J Clin Med 2020; 9:jcm9041034. [PMID: 32268542 PMCID: PMC7230461 DOI: 10.3390/jcm9041034] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/24/2020] [Accepted: 04/03/2020] [Indexed: 02/07/2023] Open
Abstract
Thyroid hormones are essential for normal skeletal development and normal bone metabolism in adults but can have detrimental effects on bone structures in states of thyroid dysfunction. Untreated severe hyperthyroidism influences the degree of bone mass and increases the probability of high bone turnover osteoporosis. Subclinical hyperthyroidism, defined as low thyrotropin (TSH) and free hormones within the reference range, is a subtler disease, often asymptomatic, and the diagnosis is incidentally made during screening exams. However, more recent data suggest that this clinical condition may affect bone metabolism resulting in decreased bone mineral density (BMD) and increased risk of fracture, particularly in postmenopausal women. The main causes of exogenous subclinical hyperthyroidism are inappropriate replacement dose of thyroxin and TSH suppressive L-thyroxine doses in the therapy of benign thyroid nodules and thyroid carcinoma. Available data similarly suggest that a long-term TSH suppressive dose of thyroxin may decrease BMD and may induce an increased risk of fracture. These effects are particularly observed in postmenopausal women but are less evident in premenopausal women. Overt hypothyroidism is known to lower bone turnover by reducing both osteoclastic bone resorption and osteoblastic activity. These changes in bone metabolism would result in an increase in bone mineralization. At the moment, there are no clear data that demonstrate any relationship between BMD in adults and hypothyroidism. Despite these clinical evidences, the cellular and molecular actions of thyroid hormones on bone structures are not complete clear.
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20
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James Cooper W, VanHall R, Sweet E, Milewski H, DeLeon Z, Verderber A, DeLeon A, Galindo D, Lazono O. Functional morphogenesis from embryos to adults: Late development shapes trophic niche in coral reef damselfishes. Evol Dev 2019; 22:221-240. [PMID: 31808993 DOI: 10.1111/ede.12321] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The damselfishes are one of the dominant coral reef fish lineages. Their ecological diversification has involved repeated transitions between pelagic feeding using fast bites and benthic feeding using forceful bites. A highly-integrative approach that combined gene expression assays, shape analyses, and high-speed video analyses was used to examine the development of trophic morphology in embryonic, larval, juvenile, and adult damselfishes. The anatomical characters that distinguish pelagic-feeding and benthic-feeding species do not appear until after larval development. Neither patterns of embryonic jaw morphogenesis, larval skull shapes nor larval bite mechanics significantly distinguished damselfishes from different adult trophic guilds. Analyses of skull shape and feeding performance identified two important transitions in the trophic development of a single species (the orange clownfish; Amphiprion percula): (a) a pronounced transformation in feeding mechanics during metamorphosis; and (b) more protracted cranial remodeling over the course of juvenile development. The results of this study indicate that changes in postlarval morphogenesis have played an important role in damselfish evolution. This is likely to be true for other fish lineages, particularly if they consist of marine species, the majority of which have planktonic larvae with different functional requirements for feeding in comparison to their adult forms.
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Affiliation(s)
- W James Cooper
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Rachel VanHall
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Elly Sweet
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Holly Milewski
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Zoey DeLeon
- School of Biological Sciences, Washington State University, Pullman, Washington
| | | | - Adrian DeLeon
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Demi Galindo
- School of Biological Sciences, Washington State University, Pullman, Washington
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21
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Galindo D, Sweet E, DeLeon Z, Wagner M, DeLeon A, Carter C, McMenamin SK, Cooper WJ. Thyroid hormone modulation during zebrafish development recapitulates evolved diversity in danionin jaw protrusion mechanics. Evol Dev 2019; 21:231-246. [PMID: 31374588 PMCID: PMC6815664 DOI: 10.1111/ede.12299] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protrusile jaws are a highly useful innovation that has been linked to extensive diversification in fish feeding ecology. Jaw protrusion can enhance the performance of multiple functions, such as suction production and capturing elusive prey. Identifying the developmental factors that alter protrusion ability will improve our understanding of fish diversification. In the zebrafish protrusion arises postmetamorphosis. Fish metamorphosis typically includes significant changes in trophic morphology, accompanies a shift in feeding niche and coincides with increased thyroid hormone production. We tested whether thyroid hormone affects the development of zebrafish feeding mechanics. We found that it affected all developmental stages examined, but that effects were most pronounced after metamorphosis. Thyroid hormone levels affected the development of jaw morphology, feeding mechanics, shape variation, and cranial ossification. Adult zebrafish utilize protrusile jaws, but an absence of thyroid hormone impaired development of the premaxillary bone, which is critical to jaw protrusion. Premaxillae from early juvenile zebrafish and hypothyroid adult zebrafish resemble those from adults in the genera Danionella, Devario, and Microdevario that show little to no jaw protrusion. Our findings suggest that evolutionary changes in how the developing skulls of danionin minnows respond to thyroid hormone may have promoted diversification into different feeding niches.
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Affiliation(s)
- Demi Galindo
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Elly Sweet
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Zoey DeLeon
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Mitchel Wagner
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Adrian DeLeon
- School of Biological Sciences, Washington State University, Pullman, Washington
| | - Casey Carter
- School of Biological Sciences, Washington State University, Pullman, Washington
| | | | - W. James Cooper
- School of Biological Sciences, Washington State University, Pullman, Washington
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Bloom MS, Wenzel AG, Brock JW, Kucklick JR, Wineland RJ, Cruze L, Unal ER, Yucel RM, Jiyessova A, Newman RB. Racial disparity in maternal phthalates exposure; Association with racial disparity in fetal growth and birth outcomes. ENVIRONMENT INTERNATIONAL 2019; 127:473-486. [PMID: 30981018 DOI: 10.1016/j.envint.2019.04.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/21/2019] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
Experimental and observational data implicate phthalates as developmental toxicants. However, few data are available to assess the maternal risks of gestational exposure by race and infant sex. To begin to address this data gap, we characterized associations between maternal urinary phthalate metabolites and birth outcomes among African American and white mothers from a southeastern U.S. population. We enrolled pregnant African American (n = 152) and white (n = 158) women with singleton live births between 18 and 22 weeks gestation. We measured phthalate metabolites (mono-n-butyl phthalate (MBP), monoisobutyl phthalate (MiBP), monobenzyl phthalate (MBzP), mono(2-ethylhexyl) phthalate (MEHP), mono(2-ethyl-5-oxohexyl) phthalate (MEOHP), mono-2-ethyl-5-hydroxyhexyl phthalate (MEHHP), monoethyl phthalate (MEP), monomethyl phthalate (MMP), and the sums of DEHP (ΣDEHP) and DBP (ΣDBP) metabolites) in up to two gestational urine specimens from mothers, and evaluated confounder-adjusted associations per natural log unit greater concentration with birth weight for gestational age z-score, small for gestational age (SGA; <10th %tile), preterm birth (PTB; <37 weeks gestation), and low birth weight (LBW; <2500 g). We also tested for interactions by maternal race and infant sex. We found that lower z-scores were associated with greater MiBP (β = -0.28; 95% CI: -0.54, -0.02) and MMP (β = -0.30; 95% CI: -0.52, -0.09) concentrations, while MEP interacted with race (p = 0.04), indicating an association among whites (β = -0.14; 95% CI: -0.28, 0.001) but not among African Americans (β = 0.05; 95% CI = -0.09, 0.19). Greater MiBP (OR = 2.82; 95% CI: 1.21, 6.56) and MEOHP (OR = 2.80; 95% CI: 1.05, 7.42) were associated with an overall higher SGA risk, greater MEHP was associated with higher SGA risk (p = 0.10) in whites (OR = 3.26 95% CI: 0.64, 16.56) but not in African Americans (OR = 0.71 95% CI: 0.07, 7.17), and the associations for MiBP (p = 0.02) and ΣDBP (p = 0.02) varied by infant sex. We detected interactions for PTB in which African Americans were at higher risk than whites for greater MiBP (p = 0.08) and MEP (p = 0.02) although lower risk for greater MEHP (p = 0.09). Greater MEP was associated with an overall higher LBW risk (OR = 1.33; 95% CI: 0.95, 1.86), and males were at higher risk than females with greater MBP (p = 0.002), MiBP (p = 0.02), MBzP (p = 0.01), MEP (p = 0.002), MMP (p = 0.09), and ΣDBP (p = 0.01) concentrations. Overall, our results suggest that gestational phthalate exposure is associated with adverse maternal birth outcomes, and that the effects vary by maternal race and infant sex.
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Affiliation(s)
- Michael S Bloom
- Department of Environmental Health Sciences, University at Albany, State University of New York, Rensselaer, NY, USA; Department of Epidemiology and Biostatistics, University at Albany, State University of New York, Rensselaer, NY, USA.
| | - Abby G Wenzel
- Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, SC, USA
| | - John W Brock
- Department of Chemistry, University of North Carolina-Asheville, Asheville, NC, USA
| | - John R Kucklick
- National Institute of Standards and Technology, Hollings Marine Laboratory, Charleston, SC, USA
| | - Rebecca J Wineland
- Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, SC, USA
| | - Lori Cruze
- Department of Biology, Wofford College, Spartanburg, SC, USA
| | - Elizabeth R Unal
- Department of Obstetrics and Gynecology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Recai M Yucel
- Department of Epidemiology and Biostatistics, University at Albany, State University of New York, Rensselaer, NY, USA
| | - Assem Jiyessova
- Department of Epidemiology and Biostatistics, University at Albany, State University of New York, Rensselaer, NY, USA
| | - Roger B Newman
- Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, SC, USA
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23
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da Silva RA, de Camargo Andrade AF, da Silva Feltran G, Fernandes CJDC, de Assis RIF, Ferreira MR, Andia DC, Zambuzzi WF. The role of triiodothyronine hormone and mechanically-stressed endothelial cell paracrine signalling synergism in gene reprogramming during hBMSC-stimulated osteogenic phenotype in vitro. Mol Cell Endocrinol 2018; 478:151-167. [PMID: 30142372 DOI: 10.1016/j.mce.2018.08.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 08/19/2018] [Accepted: 08/20/2018] [Indexed: 12/20/2022]
Abstract
We therefore investigated whether there is synergism between triiodothyronine (T3) hormone and trophic molecules released from mechanically-stressed endothelial cells (EC-enriched medium) in osteogenic phenotype by mapping classical repertory of genes. Although there are studies reporting the efficiency of T3 hormone on bone cells, it is scarce considering their effect in conjunction with other physiologically active molecules, such as those released by the active endothelial cells. To address this issue, human bone marrow-derived mesenchymal stem cells (hBMSCs) were treated with EC-enriched medium subjected to shear-stress up to 72 h in vitro, in conjunction or not with T3 hormone. Although our results found an important synergism considering these parameters on modulating key bone-related gene markers, such as on the alkaline phosphatase (ALP) behavior (at both mRNA and protein content), contributing for osteoblast differentiation, important genes such as OSTERIX and RUNX2 were significantly down-expressed, while a over-expression of RANKL was found when the conjunction effect of T3 and endothelial paracrine signaling was considered. In addition, T3 hormone over expressed both OCT4 and NANOG genes in a DNA epigenetic-independent manner. However, we observed a dynamic reprogramming of DNMT1, DNMT3A, DNMT3B and TET1, important DNA-related epigenetic markers. Specifically, T3 hormone alone up-modulated TET2 transcripts profile. Complimentarily, expression of microRNA (miRs) processing-related genes also was modulated, as well as miR-10b, miR-22, miR-21, miR-143 and miR-145 transcriptional related profiles. Altogether, our results suggested a positive effect of mechanically-stressed endothelial cells-induced paracrine signaling on T3 hormone-obtaining osteogenic phenotype, contributing to understanding the paradoxal effect of T3 hormone on the bone physiology.
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Affiliation(s)
- Rodrigo A da Silva
- Department of Chemistry and Biochemistry, São Paulo State University (UNESP), Institute of Biosciences, Campus Botucatu, Brazil
| | | | - Geórgia da Silva Feltran
- Department of Chemistry and Biochemistry, São Paulo State University (UNESP), Institute of Biosciences, Campus Botucatu, Brazil
| | - Célio Júnior da C Fernandes
- Department of Chemistry and Biochemistry, São Paulo State University (UNESP), Institute of Biosciences, Campus Botucatu, Brazil
| | - Rahyza Inacio F de Assis
- Área de Periodontia, Departamento de Prótese e Periodontia, Faculdade de Odontologia de Piracicaba, Universidade de Campinas, Piracicaba, São Paulo, 13414-018, Brazil
| | - Marcel Rodrigues Ferreira
- Department of Chemistry and Biochemistry, São Paulo State University (UNESP), Institute of Biosciences, Campus Botucatu, Brazil
| | - Denise C Andia
- Área de Epigenética, Faculdade de Odontologia, Universidade Paulista, São Paulo, 04026-002, Brazil
| | - Willian F Zambuzzi
- Department of Chemistry and Biochemistry, São Paulo State University (UNESP), Institute of Biosciences, Campus Botucatu, Brazil; Electron Microscopy Center, São Paulo State University (UNESP), Institute of Biosciences, Campus Botucatu, Brazil.
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24
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Petkus DL, Murray-Kolb LE, De Souza MJ. The Unexplored Crossroads of the Female Athlete Triad and Iron Deficiency: A Narrative Review. Sports Med 2018; 47:1721-1737. [PMID: 28290159 DOI: 10.1007/s40279-017-0706-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Despite the severity and prevalence of iron deficiency in exercising women, few published reports have explored how iron deficiency interacts with another prevalent and severe condition in exercising women: the 'female athlete triad.' This review aims to describe how iron deficiency may interact with each component of the female athlete triad, that is, energy status, reproductive function, and bone health. The effects of iron deficiency on energy status are discussed in regards to thyroid function, metabolic fuel availability, eating behaviors, and energy expenditure. The interactions between iron deficiency and reproductive function are explored by discussing the potentially impaired fertility and hyperprolactinemia due to iron deficiency and the alterations in iron metabolism due to menstrual blood loss and estrogen exposure. The interaction of iron deficiency with bone health may occur via dysregulation of the growth hormone/insulin-like growth factor-1 axis, hypoxia, and hypothyroidism. Based on these discussions, several future directions for research are presented.
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Affiliation(s)
- Dylan L Petkus
- Department of Kinesiology, The Pennsylvania State University, 104 Noll Laboratory, University Park, PA, 16802, USA
| | - Laura E Murray-Kolb
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Mary Jane De Souza
- Department of Kinesiology, The Pennsylvania State University, 104 Noll Laboratory, University Park, PA, 16802, USA.
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25
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Idelevich A, Baron R. Brain to bone: What is the contribution of the brain to skeletal homeostasis? Bone 2018; 115:31-42. [PMID: 29777919 PMCID: PMC6110971 DOI: 10.1016/j.bone.2018.05.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 05/15/2018] [Accepted: 05/15/2018] [Indexed: 12/13/2022]
Abstract
The brain, which governs most, if not all, physiological functions in the body, from the complexities of cognition, learning and memory, to the regulation of basal body temperature, heart rate and breathing, has long been known to affect skeletal health. In particular, the hypothalamus - located at the base of the brain in close proximity to the medial eminence, where the blood-brain-barrier is not as tight as in other regions of the brain but rather "leaky", due to fenestrated capillaries - is exposed to a variety of circulating body cues, such as nutrients (glucose, fatty acids, amino acids), and hormones (insulin, glucagon, leptin, adiponectin) [1-3].Information collected from the body via these peripheral cues is integrated by hypothalamic sensing neurons and glial cells [4-7], which express receptors for these nutrients and hormones, transforming these cues into physiological outputs. Interestingly, many of the same molecules, including leptin, adiponectin and insulin, regulate both energy and skeletal homeostasis. Moreover, they act on a common set of hypothalamic nuclei and their residing neurons, activating endocrine and neuronal systems, which ultimately fine-tune the body to new physiological states. This review will focus exclusively on the brain-to-bone pathway, highlighting the most important anatomical sites within the brain, which are known to affect bone, but not covering the input pathways and molecules informing the brain of the energy and bone metabolic status, covered elsewhere [8-10]. The discussion in each section will present side by side the metabolic and bone-related functions of hypothalamic nuclei, in an attempt to answer some of the long-standing questions of whether energy is affected by bone remodeling and homeostasis and vice versa.
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Affiliation(s)
- Anna Idelevich
- Department of Medicine, Harvard Medical School and Endocrine Unit MGH, Division of Bone and Mineral Metabolism, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Roland Baron
- Department of Medicine, Harvard Medical School and Endocrine Unit MGH, Division of Bone and Mineral Metabolism, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA.
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26
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Tsevis K, Trakakis E, Pergialiotis V, Alhazidou E, Peppa M, Chrelias C, Papantoniou N, Panagopoulos P. The influence of thyroid disorders on bone density and biochemical markers of bone metabolism. Horm Mol Biol Clin Investig 2018; 35:/j/hmbci.2018.35.issue-1/hmbci-2018-0039/hmbci-2018-0039.xml. [PMID: 30218603 DOI: 10.1515/hmbci-2018-0039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 08/15/2018] [Indexed: 12/30/2022]
Abstract
Background Thyroid dysfunction, predominantly hyperthyroidism, has been previously linked to impaired bone mass density (BMD) and increased risk of fractures. On the other hand, data in the field of hypothyroidism (HT) are missing. The purpose of the present study was to investigate the impact of thyroid disorders on bone density serum and urine calcium (Ca) and phosphate (P) as well as serum osteocalcin and alkaline phosphatase and urine hydroxyproline in a series of post-menopausal women. Materials and methods The study was conducted in the Reproductive Endocrinology Outpatient Clinic of our hospital. A consecutive series of post-menopausal women was included, after excluding patients under hormone treatment (including levothyroxine supplementation) and those who received raloxifene, tamoxifen or tibolone during the study period as well as those who received treatment during the previous 12 months were excluded from the present study. Results Overall, 188 women were included in the present study. Among them, 143 women had normal thyroid function, 32 women had hyperthyroidism and 13 women had HT. Correlation of thyroid function indices with osteoporosis indices revealed statistically significant correlations between thyroxine (T4) and free triiodothyronine (T3) with T-, Z-scores and BMD. Logistic regression analysis concerning the impact of HT and hyperthyroidism on T-score, Z-score and bone mass density revealed that both pathological entities negatively affect bone health (p < 0.05). Conclusion The findings of our study suggest that not only hyperthyroidism, but also HT negatively affects BMD. Future studies should investigate this association and corroborate our findings.
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Affiliation(s)
- Konstantinos Tsevis
- Third Department of Obstetrics and Gynecology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Eftihios Trakakis
- Third Department of Obstetrics and Gynecology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Vasilios Pergialiotis
- Third Department of Obstetrics and Gynecology, University of Athens, Attikon University Hospital Athens Greece, Rimini 1 Chaidari, Athens, PC 12461, Greece, Phone: +2105832244, Fax: +2105326447
| | - Eleni Alhazidou
- Third Department of Obstetrics and Gynecology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Melpomeni Peppa
- Endocrine and Metabolic Bone Disorders Unit, 2nd Department of Internal Medicine and Research Institute and Diabetes Center, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Charalampos Chrelias
- Third Department of Obstetrics and Gynecology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Nikolaos Papantoniou
- Third Department of Obstetrics and Gynecology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Periklis Panagopoulos
- Third Department of Obstetrics and Gynecology, "Attikon" University Hospital, National and Kapodistrian University of Athens, Athens, Greece
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27
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Behringer V, Deimel C, Hohmann G, Negrey J, Schaebs FS, Deschner T. Applications for non-invasive thyroid hormone measurements in mammalian ecology, growth, and maintenance. Horm Behav 2018; 105:66-85. [PMID: 30063897 DOI: 10.1016/j.yhbeh.2018.07.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 07/24/2018] [Accepted: 07/25/2018] [Indexed: 12/22/2022]
Abstract
Thyroid hormones (THs) play a pivotal role in the regulation of metabolic activity throughout all life stages. Cross-talk with other hormone systems permits THs to coordinate metabolic changes as well as modifications in growth and maintenance in response to changing environmental conditions. The scope of this review is to explain the relevant basics of TH endocrinology, highlight pertinent topics that have been investigated so far, and offer guidance on measuring THs in non-invasively collected matrices. The first part of the review provides an overview of TH biochemistry, which is necessary to understand and interpret the findings of existing studies and to apply non-invasive TH monitoring. The second part focuses on the role of THs in mammalian ecology, and the third part highlights the role of THs in growth and maintenance. The fourth part deals with the advantages and difficulties of measuring THs in non-invasively collected samples. This review concludes with a summary that considers future directions in the study of THs.
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Affiliation(s)
- V Behringer
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.
| | - C Deimel
- Department of Anthropology, Indiana University Bloomington, 701 E Kirkwood Ave, Bloomington, IN 47405, USA
| | - G Hohmann
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - J Negrey
- Department of Anthropology, Boston University, 232 Bay State Road, Boston, MA 02215, USA
| | - F S Schaebs
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - T Deschner
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
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28
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Kesterke MJ, Judd MA, Mooney MP, Siegel MI, Elsalanty M, Howie RN, Weinberg SM, Cray JJ. Maternal environment and craniofacial growth: geometric morphometric analysis of mandibular shape changes with in utero thyroxine overexposure in mice. J Anat 2018; 233:46-54. [PMID: 29611183 DOI: 10.1111/joa.12810] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2018] [Indexed: 12/18/2022] Open
Abstract
An estimated 3% of US pregnancies are affected by maternal thyroid dysfunction, with between one and three of every 1000 pregnancies being complicated by overactive maternal thyroid levels. Excess thyroid hormones are linked to neurological impairment and excessive craniofacial variation, affecting both endochondral and intramembranous bone. Using a geometric morphometric approach, this study evaluates the role of in utero thyroxine overexposure on the growth of offspring mandibles in a sample of 241 mice. Canonical variate analysis utilized 16 unilateral mandibular landmarks obtained from 3D micro-computed tomography to assess shape changes between unexposed controls (n = 63) and exposed mice (n = 178). By evaluating shape changes in the mandible among three age groups (15, 20 and 25 days postnatal) and different dosage levels (low, medium and high), this study found that excess maternal thyroxine alters offspring mandibular shape in both age- and dosage-dependent manners. Group differences in overall shape were significant (P < 0.001), and showed major changes in regions of the mandible associated with muscle attachment (coronoid process, gonial angle) and regions of growth largely governed by articulation with the cranial base (condyle) and occlusion (alveolus). These results compliment recent studies demonstrating that maternal thyroxine levels can alter the cranial base and cranial vault of offspring, contributing to a better understanding of both normal and abnormal mandibular development, as well as the medical implications of craniofacial growth and development.
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Affiliation(s)
| | - Margaret A Judd
- Department of Anthropology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Mark P Mooney
- Department of Anthropology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Oral Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Plastic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Orthodontics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Communication Sciences and Disorders, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Michael I Siegel
- Department of Anthropology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Oral Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Orthodontics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | | | - R Nicole Howie
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Seth M Weinberg
- Department of Anthropology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.,Department of Oral Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - James J Cray
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, South Carolina, USA
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29
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Durham E, Howie RN, Parsons T, Bennfors G, Black L, Weinberg SM, Elsalanty M, Yu JC, Cray JJ. Thyroxine Exposure Effects on the Cranial Base. Calcif Tissue Int 2017; 101:300-311. [PMID: 28391432 PMCID: PMC5545063 DOI: 10.1007/s00223-017-0278-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 04/03/2017] [Indexed: 01/19/2023]
Abstract
Thyroid hormone is important for skull bone growth, which primarily occurs at the cranial sutures and synchondroses. Thyroid hormones regulate metabolism and act in all stages of cartilage and bone development and maintenance by interacting with growth hormone and regulating insulin-like growth factor. Aberrant thyroid hormone levels and exposure during development are exogenous factors that may exacerbate susceptibility to craniofacial abnormalities potentially through changes in growth at the synchondroses of the cranial base. To elucidate the direct effect of in utero therapeutic thyroxine exposure on the synchondroses in developing mice, we provided scaled doses of the thyroid replacement drug, levothyroxine, in drinking water to pregnant C57BL6 wild-type dams. The skulls of resulting pups were subjected to micro-computed tomography analysis revealing less bone volume relative to tissue volume in the synchondroses of mouse pups exposed in utero to levothyroxine. Histological assessment of the cranial base area indicated more active synchondroses as measured by metabolic factors including Igf1. The cranial base of the pups exposed to high levels of levothyroxine also contained more collagen fiber matrix and an increase in markers of bone formation. Such changes due to exposure to exogenous thyroid hormone may drive overall morphological changes. Thus, excess thyroid hormone exposure to the fetus during pregnancy may lead to altered craniofacial growth and increased risk of anomalies in offspring.
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Affiliation(s)
- Emily Durham
- Department of Oral Health Sciences, Medical University of South Carolina, 173 Ashley Avenue, BS 230B, Charleston, SC, 29425, USA
| | - R Nicole Howie
- Department of Oral Health Sciences, Medical University of South Carolina, 173 Ashley Avenue, BS 230B, Charleston, SC, 29425, USA
| | - Trish Parsons
- Department of Oral Biology, School of Dental Medicine, Center for Craniofacial and Dental Genetics, University of Pittsburgh, 3501 Terrace Street, Pittsburgh, PA, 15213, USA
| | - Grace Bennfors
- Department of Oral Health Sciences, Medical University of South Carolina, 173 Ashley Avenue, BS 230B, Charleston, SC, 29425, USA
| | - Laurel Black
- Department of Oral Health Sciences, Medical University of South Carolina, 173 Ashley Avenue, BS 230B, Charleston, SC, 29425, USA
| | - Seth M Weinberg
- Department of Oral Biology, School of Dental Medicine, Center for Craniofacial and Dental Genetics, University of Pittsburgh, 3501 Terrace Street, Pittsburgh, PA, 15213, USA
| | - Mohammed Elsalanty
- Departments of Oral Biology, Cellular Biology and Anatomy, Orthopaedic Surgery and Oral and Maxillofacial Surgery, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA
- Institute for Regenerative and Reparative Medicine, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA
| | - Jack C Yu
- Institute for Regenerative and Reparative Medicine, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA
- Division of Plastic Surgery, Department of Surgery, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA
| | - James J Cray
- Department of Oral Health Sciences, Medical University of South Carolina, 173 Ashley Avenue, BS 230B, Charleston, SC, 29425, USA.
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30
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Emery Thompson M. Energetics of feeding, social behavior, and life history in non-human primates. Horm Behav 2017; 91:84-96. [PMID: 27594442 DOI: 10.1016/j.yhbeh.2016.08.009] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 08/29/2016] [Accepted: 08/30/2016] [Indexed: 01/05/2023]
Abstract
Energy is a variable of key importance to a wide range of research in primate behavioral ecology, life history, and conservation. However, obtaining detailed data on variation in energetic condition, and its biological consequences, has been a considerable challenge. In the past 20years, tremendous strides have been made towards non-invasive methods for monitoring the physiology of animals in their natural environment. These methods provide detailed, individualized data about energetic condition, as well as energy allocations to growth, reproduction, and somatic health. In doing so, they add much-needed resolution by which to move beyond correlative studies to research programs that can discriminate causes from effects and disaggregate multiple correlated features of the social and physical environment. In this review, I describe the conceptual and methodological approaches for studying primate energetics. I then discuss the core questions about primate feeding ecology, social behavior, and life history that can benefit from physiological studies, highlighting the ways in which recent research has done so. Among these are studies that test, and often refute, common assumptions about how feeding ecology shapes primate biology, and those that reveal proximate associations between energetics and reproductive strategies.
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Affiliation(s)
- Melissa Emery Thompson
- Department of Anthropology, University of New Mexico, MSC01-1040, 500 University Blvd NE, Albuquerque 87131, Mexico.
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31
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Emery Thompson M. Energetics of feeding, social behavior, and life history in non-human primates. Horm Behav 2017; 91:84-96. [PMID: 27594442 DOI: 10.10.1016/j.yhbeh.2016.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 08/29/2016] [Accepted: 08/30/2016] [Indexed: 05/21/2023]
Abstract
Energy is a variable of key importance to a wide range of research in primate behavioral ecology, life history, and conservation. However, obtaining detailed data on variation in energetic condition, and its biological consequences, has been a considerable challenge. In the past 20years, tremendous strides have been made towards non-invasive methods for monitoring the physiology of animals in their natural environment. These methods provide detailed, individualized data about energetic condition, as well as energy allocations to growth, reproduction, and somatic health. In doing so, they add much-needed resolution by which to move beyond correlative studies to research programs that can discriminate causes from effects and disaggregate multiple correlated features of the social and physical environment. In this review, I describe the conceptual and methodological approaches for studying primate energetics. I then discuss the core questions about primate feeding ecology, social behavior, and life history that can benefit from physiological studies, highlighting the ways in which recent research has done so. Among these are studies that test, and often refute, common assumptions about how feeding ecology shapes primate biology, and those that reveal proximate associations between energetics and reproductive strategies.
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Affiliation(s)
- Melissa Emery Thompson
- Department of Anthropology, University of New Mexico, MSC01-1040, 500 University Blvd NE, Albuquerque 87131, Mexico.
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32
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Cheng S, Xing W, Pourteymoor S, Mohan S. Effects of Thyroxine (T4), 3,5,3'-triiodo-L-thyronine (T3) and their Metabolites on Osteoblast Differentiation. Calcif Tissue Int 2016; 99:435-42. [PMID: 27312083 DOI: 10.1007/s00223-016-0159-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 06/03/2016] [Indexed: 02/07/2023]
Abstract
Studies involving human genetic mutations and mutant mouse models have provided irrevocable evidence for a key role for thyroid hormones (THs) in the regulation of skeletal growth. While T3 binds to TH receptors with higher affinity than T4, T4 occupied TH receptors have also been reported in the nucleus under euthyroid conditions raising the possibility that T4 bound nuclear receptors may be biologically relevant in thyroid syndromes with elevated free T4 and reduced T3 levels. We, therefore, evaluated the direct effects of T4, T3, and their metabolites (rT3 and T2) in stimulating osteoblast differentiation using MC3T3-E1 preosteoblasts which do not produce detectable levels of deiodinases. Under serum-free conditions, a 24-h treatment of MC3T3-E1 cells with THs and their metabolites caused a dose-dependent increase in the expression of osteoblast differentiation markers, osterix, and osteocalcin. Circulating concentrations of T3 (~1 ng/ml) and T4 (~30 ng/ml) showed similar potency in stimulating osteoblast differentiation marker expression, while rT3 and T2 were less potent than T3 and T4. Moreover, T3 and T4 treatments elevated the IGF-1 mRNA level suggesting the involvement of IGF-1 signaling in the TH regulation of osteoblast differentiation. We conclude that an elevated T4 level in the absence of T3 may exert stimulatory effects on osteoblast differentiation. The establishment of cell-specific effects of T4 on osteoblasts may provide a strategy to generate T4 mimics that exert skeletal specific effects without the confounding T3 effects on other tissues.
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Affiliation(s)
- Shaohong Cheng
- Musculoskeletal Disease Center, Jerry L Pettis VA Medical Center, 11201 Benton St, Loma Linda, CA, 92357, USA
| | - Weirong Xing
- Musculoskeletal Disease Center, Jerry L Pettis VA Medical Center, 11201 Benton St, Loma Linda, CA, 92357, USA
- Departments of Medicine, Loma Linda University, Loma Linda, CA, 92354, USA
| | - Sheila Pourteymoor
- Musculoskeletal Disease Center, Jerry L Pettis VA Medical Center, 11201 Benton St, Loma Linda, CA, 92357, USA
| | - Subburaman Mohan
- Musculoskeletal Disease Center, Jerry L Pettis VA Medical Center, 11201 Benton St, Loma Linda, CA, 92357, USA.
- Departments of Medicine, Loma Linda University, Loma Linda, CA, 92354, USA.
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Tuchendler D, Bolanowski M. The influence of thyroid dysfunction on bone metabolism. Thyroid Res 2014; 7:12. [PMID: 25648501 PMCID: PMC4314789 DOI: 10.1186/s13044-014-0012-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 12/08/2014] [Indexed: 12/04/2022] Open
Abstract
Loss of bone mineral density due to osteoporosis is the main cause of fragility fractures and leads to dropped quality of life and increased mortality. Disturbance of balance between bone formation and bone resorption is dangerous, can cause loss of bone mass and disruption of it's architecture. Correct development, achievement of peak bone mass and normal functioning of human skeleton depend on different factors. The pivotal role in bone metabolism play thyroid hormones. Both excess as well as deficiency of fT4 and fT3 can be potentially deleterious for bone tissue. The aim of this study is to review the current literature concerning the role of thyroid hormones on bone metabolism.
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Affiliation(s)
- Dominika Tuchendler
- />Endocrinology Department, Clinic of Internal Medicine, 4th Military Hospital, Wrocław, Poland
| | - Marek Bolanowski
- />Chair and Department of Endocrinology, Diabetes and Isotope Therapy, Medical University Wrocław, Wrocław, Poland
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Christy AL, D'Souza V, Babu RP, Takodara S, Manjrekar P, Hegde A, Rukmini MS. Utility of C-terminal Telopeptide in Evaluating Levothyroxine Replacement Therapy-Induced Bone Loss. Biomark Insights 2014; 9:1-6. [PMID: 24634578 PMCID: PMC3948734 DOI: 10.4137/bmi.s13965] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 01/27/2014] [Accepted: 01/28/2014] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND Levothyroxine (LT4) therapy has shown to have effects on bone metabolism though its deleterious effect on bone remodeling is debatable. This study was aimed at assessing the diagnostic utility of the bone remodeling marker C-terminal telopeptide (CTx) in detecting early bone loss. MATERIALS AND METHODS In this case-control study, 84 premenopausal women of 30-45 years of age were selected. Out of them, 28 were recently diagnosed of hypothyroidism (not on LT4), 28 were on LT4 replacement therapy (100-200 μg/day) for more than five years, and 28 had euthyroid. Plasma CTx levels were estimated. Bone mineral density (BMD) was measured by quantitative ultrasound (QUS) method. Pearson's coefficient of correlation and ANOVA were used for statistical analysis. RESULTS CTx was most elevated in LT4-treated group (0.497 ± 0.209 ng/mL). It showed a significant negative correlation with T-score and Z-score of BMD values. In the treatment group of more than 150 μg/day, CTx showed significantly negative correlation with TSH (r = -0.462, P = 0.047). CONCLUSION LT4 therapy induces bone loss in hypothyroid patients. CTx levels can measure such bone loss along with BMD. Regular monitoring of CTx with adjustment in LT4 doses may help delay osteoporosis induced by prolonged LT4 replacement therapy.
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Affiliation(s)
- Alap L Christy
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
| | - Vivian D'Souza
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
| | - Ruby P Babu
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
| | - Sohil Takodara
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
| | - Poornima Manjrekar
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
| | - Anupama Hegde
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
| | - M S Rukmini
- Department of Biochemistry, Kasturba Medical College, Manipal University, Mangalore, India
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Venditti P, Di Stefano L, Di Meo S. Vitamin E management of oxidative damage-linked dysfunctions of hyperthyroid tissues. Cell Mol Life Sci 2013; 70:3125-44. [PMID: 23255045 PMCID: PMC11114018 DOI: 10.1007/s00018-012-1217-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 11/15/2012] [Accepted: 11/19/2012] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Thyroid hormones affect growth, development, and metabolism of vertebrates, and are considered the major regulators of their homeostasis. On the other hand, elevated circulating levels of thyroid hormones are associated with modifications in the whole organism (weight loss and increased metabolism and temperature) and in several body regions. Indeed, tachycardia, atrial arrhythmias, heart failure, muscle weakness and wasting, bone mass loss, and hepatobiliary complications are commonly found in hyperthyroid animals and humans. RESULTS Most thyroid hormone actions result from influences on transcription of T3-responsive genes, which are mediated through nuclear receptors. However, there is significant evidence that tissue oxidative stress underlies some dysfunctions produced by hyperthyroidism. DISCUSSION During the last decades, increasing interest has been turned to the use of antioxidants as therapeutic agents in various diseases and pathophysiological disorders believed to be mediated by oxidative stress. In particular, because elevated circulating levels of thyroid hormones are associated with tissue oxidative injury, more attention has been paid to explore the application of antioxidants as therapeutic agents in thyroid related disorders. CONCLUSIONS At present, vitamin E is among the most commonly consumed dietary supplements due to the belief that it, as an antioxidant, may attenuate morbidity and mortality. This is due to the results of numerous scientific studies, which demonstrate that vitamin E has a primary function to destroy peroxyl radicals, thus protecting polyunsaturated fatty acids biological membranes from oxidative damage. However, results are also available indicating that protective vitamin E effects against oxidative damage can be obtained even through different mechanisms.
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Affiliation(s)
- Paola Venditti
- Dipartimento delle Scienze Biologiche, Sezione di Fisiologia, Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy.
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Demirel U, Özek E, Bereket A, Demirel B, Topuzoğlu A, Akman İ. Does transient hypothyroxinemia influence metabolic bone disease of prematurity? J Matern Fetal Neonatal Med 2013; 26:1844-9. [PMID: 23672243 DOI: 10.3109/14767058.2013.804051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To investigate the relationship between Metabolic Bone Disease (MBD) and Transient Hypothyroxinemia of Prematurity (THOP). METHOD One hundred twenty-four infants, born in Marmara University Hospital with a gestational age ≤34 weeks, were enrolled. Clinical features were recorded. Serum TSH, free T4, total T4, calcium, phosphorus and total Alkaline Phosphatase (ALP) levels were determined in the first and third postnatal weeks. MBD was defined as a phosphorus level <4.5 mg/dl and/or ALP >900 IU/l. THOP was defined as a serum free and/or total thyroxine level lower than -1 SD for gestational age at the 7th postnatal day. RESULT THOP was diagnosed in nineteen (15.3%) patients. MBD was diagnosed in 52 (41.9%) at the 3rd month. Low birth weight, low gestational age and prolonged parenteral nutrition were associated with MBD. Multivariate analysis documented a significant relationship solely between MBD and gestational age. CONCLUSION The risk of MBD does not increase significantly in babies with THOP.
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Affiliation(s)
- Utku Demirel
- Department of Neonatology, Bahcesehir University Hospital , Istanbul , Turkey
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Kim HY, Mohan S. Role and Mechanisms of Actions of Thyroid Hormone on the Skeletal Development. Bone Res 2013; 1:146-61. [PMID: 26273499 DOI: 10.4248/br201302004] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 04/28/2013] [Indexed: 01/03/2023] Open
Abstract
The importance of the thyroid hormone axis in the regulation of skeletal growth and maintenance has been well established from clinical studies involving patients with mutations in proteins that regulate synthesis and/or actions of thyroid hormone. Data from genetic mouse models involving disruption and overexpression of components of the thyroid hormone axis also provide direct support for a key role for thyroid hormone in the regulation of bone metabolism. Thyroid hormone regulates proliferation and/or differentiated actions of multiple cell types in bone including chondrocytes, osteoblasts and osteoclasts. Thyroid hormone effects on the target cells are mediated via ligand-inducible nuclear receptors/transcription factors, thyroid hormone receptor (TR) α and β, of which TRα seems to be critically important in regulating bone cell functions. In terms of mechanisms for thyroid hormone action, studies suggest that thyroid hormone regulates a number of key growth factor signaling pathways including insulin-like growth factor-I, parathyroid hormone related protein, fibroblast growth factor, Indian hedgehog and Wnt to influence skeletal growth. In this review we describe findings from various genetic mouse models and clinical mutations of thyroid hormone signaling related mutations in humans that pertain to the role and mechanism of action of thyroid hormone in the regulation of skeletal growth and maintenance.
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Affiliation(s)
- Ha-Young Kim
- Musculoskeletal Disease Center, Loma Linda VA HealthCare System , Loma Linda, CA 92357, USA ; Departments of Medicine, Loma Linda University , Loma Linda, CA 92354, USA ; Division of Endocrinology, Department of Internal Medicine, Wonkwang University Sanbon Hospital , Gunpo, Gyeonggi, Korea
| | - Subburaman Mohan
- Musculoskeletal Disease Center, Loma Linda VA HealthCare System , Loma Linda, CA 92357, USA ; Departments of Medicine, Loma Linda University , Loma Linda, CA 92354, USA
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Gorka J, Taylor-Gjevre RM, Arnason T. Metabolic and clinical consequences of hyperthyroidism on bone density. Int J Endocrinol 2013; 2013:638727. [PMID: 23970897 PMCID: PMC3736466 DOI: 10.1155/2013/638727] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 06/25/2013] [Indexed: 11/23/2022] Open
Abstract
In 1891, Von Recklinghausen first established the association between the development of osteoporosis in the presence of overt hyperthyroidism. Subsequent reports have demonstrated that BMD loss is common in frank hyperthyroidism, and, to a lesser extent, in subclinical presentations. With the introduction of antithyroid medication in the 1940s to control biochemical hyperthyroidism, the accompanying bone disease became less clinically apparent as hyperthyroidism was more successfully treated medically. Consequently, the impact of the above normal thyroid hormones in the pathogenesis of osteoporosis may be presently underrecognized due to the widespread effective treatments. This review aims to present the current knowledge of the consequences of hyperthyroidism on bone metabolism. The vast number of recent papers touching on this topic highlights the recognized impact of this common medical condition on bone health. Our focus in this review was to search for answers to the following questions. What is the mechanisms of action of thyroid hormones on bone metabolism? What are the clinical consequences of hyperthyroidism on BMD and fracture risk? What differences are there between men and women with thyroid disease and how does menopause change the clinical outcomes? Lastly, we report how different treatments for hyperthyroidism benefit thyroid hormone-induced osteoporosis.
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Affiliation(s)
- Jagoda Gorka
- Department of Medicine, University of Saskatchewan, Saskatoon, Canada S7N 0W8
| | - Regina M. Taylor-Gjevre
- Division of Rheumatology, Department of Medicine, University of Saskatchewan, Saskatoon, Canada S7N 0W8
| | - Terra Arnason
- Division of Endocrinology and Metabolism, Department of Medicine, University of Saskatchewan, Saskatoon, Canada S7N 0W8
- *Terra Arnason:
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Hashmi SS, Canfield MA, Marengo L, Moffitt KB, Belmont JW, Freedenberg D, Tanksley SM, Lupo PJ. The association between neonatal thyroxine and craniosynostosis, Texas, 2004-2007. ACTA ACUST UNITED AC 2012; 94:1004-9. [PMID: 23109112 DOI: 10.1002/bdra.23077] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 07/24/2012] [Accepted: 07/30/2012] [Indexed: 11/10/2022]
Abstract
BACKGROUND Craniosynostosis (CS), a structural anomaly characterized by premature fusion of cranial sutures, occurs in 1 in 2000 live births. Associations of CS with the thyroid have been reported. Neonatal thyroid hormone (T4) is evaluated nationally at birth by the Newborn Screening Program (NBS). This study evaluated the relationship between NBS T4 levels and craniosynostosis. METHODS Live-born singleton babies born in 2004 through 2007 were identified through the Texas Birth Defects Registry (499 cases) and Texas Bureau of Vital Statistics (3570 controls) and successfully linked to analyte data available in the Texas NBS Database. Cases were classified based on the absence of other major defects (isolated cases, n = 382) and suture(s) involved. Mean T4 levels were compared between controls and cases (overall and stratified by classification). T4 levels were stratified by quintiles to evaluate differences between cases and controls within quintiles. The diagnostic utility of NBS T4 was evaluated using receiver operator characteristic (ROC) curves. RESULTS Mean T4 levels were lower in isolated cases (16.89 μg/dl) than in controls (17.77 μg/dl; p = 0.0004). This trend persisted for sagittal (16.69 μg/dl; p = 0.002) and metopic (16.83 μg/dl; p = 0.042) CS. When stratified by quintiles, 54% of isolated lambdoid CS were in the first quintile compared to controls (p = 0.012). ROC area under the curve (AUC) was approximately 0.55 for all classifications except lambdoid (AUC = 0.73). CONCLUSION NBS T4 levels were slightly lower among cases with nearly half of all lambdoid CS having T4 levels in the lowest quintile. However, overall NBS T4 levels are not suitable for potential screening or diagnostic application.
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Wojcicka A, Bassett JHD, Williams GR. Mechanisms of action of thyroid hormones in the skeleton. Biochim Biophys Acta Gen Subj 2012; 1830:3979-86. [PMID: 22634735 DOI: 10.1016/j.bbagen.2012.05.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Revised: 04/19/2012] [Accepted: 05/18/2012] [Indexed: 11/25/2022]
Abstract
BACKGROUND Thyroid hormones regulate skeletal development, acquisition of peak bone mass and adult bone maintenance. Abnormal thyroid status during childhood disrupts bone maturation and linear growth, while in adulthood it results in altered bone remodeling and an increased risk of fracture SCOPE OF REVIEW This review considers the cellular effects and molecular mechanisms of thyroid hormone action in the skeleton. Human clinical and population data are discussed in relation to the skeletal phenotypes of a series of genetically modified mouse models of disrupted thyroid hormone signaling. MAJOR CONCLUSIONS Euthyroid status is essential for normal bone development and maintenance. Major thyroid hormone actions in skeletal cells are mediated by thyroid hormone receptor α (TRα) and result in anabolic responses during growth and development but catabolic effects in adulthood. These homeostatic responses to thyroid hormone are locally regulated in individual skeletal cell types by the relative activities of the type 2 and 3 iodothyronine deiodinases, which control the supply of the active thyroid hormone 3,5,3'-L-triiodothyronine (T3) to its receptor. GENERAL SIGNIFICANCE Population studies indicate that both thyroid hormone deficiency and excess are associated with an increased risk of fracture. Understanding the cellular and molecular basis of T3 action in skeletal cells will lead to the identification of new targets to regulate bone turnover and mineralization in the prevention and treatment of osteoporosis. This article is part of a Special Issue entitled Thyroid hormone signaling.
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Affiliation(s)
- Anna Wojcicka
- The Medical Centre of Postgraduate Education, Department of Biochemistry and Molecular Biology, ul.Marymoncka 99/103, 01-813 Warsaw, Poland
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Ben Amara I, Troudi A, Soudani N, Guermazi F, Zeghal N. Toxicity of methimazole on femoral bone in suckling rats: Alleviation by selenium. ACTA ACUST UNITED AC 2012; 64:187-95. [DOI: 10.1016/j.etp.2010.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 07/06/2010] [Accepted: 08/10/2010] [Indexed: 11/16/2022]
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[Effects of food restriction imposed to adult rats on the bone growth and the histological structure of the thyroid in their youth]. ACTA ACUST UNITED AC 2011; 60:296-300. [PMID: 22041177 DOI: 10.1016/j.patbio.2011.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Accepted: 08/25/2011] [Indexed: 11/20/2022]
Abstract
STUDY PURPOSE Our objective was the study of the development and the maturation of pups whose mothers were subjected to intermittent fasting. MATERIALS AND METHODS Eight pregnant female Wistar rats were distributed into two groups of four adult females. The rats of the first group were subjected to intermittent fasting beginning on the 14th day of gestation and continued 21 days after parturition. The rats of the second group were normally fed. The young of both groups of rats were sacrificed at the age of 21 days. RESULTS The pups of the female rats submitted to food restriction showed a reduction of the body weight (-35%), of the thyroid iodine content (P<0.001) and of segment thyroxin (P<0.05). The histological study revealed that these pups presented colloid depletion of this follicular thyroid, non-anastomosing trabeculae, cortical bone thinning, decreased bone mineral content, absence of osteoid formation and decreased number of osteoclasts. CONCLUSION Dietary restriction imposed on adult rats, from gestation, led to the installation in their pups of a state of malnutrition and a description of thyroid histology. This thyroid abnormality is associated with hypothyroidism that led, at least in part, to the collapse of the ability to regulate bone remodeling.
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Qiu J, Ma XL, Wang X, Chen H, Huang BR. Insulin-like growth factor binding protein-6 interacts with the thyroid hormone receptor α1 and modulates the thyroid hormone-response in osteoblastic differentiation. Mol Cell Biochem 2011; 361:197-208. [PMID: 21997736 DOI: 10.1007/s11010-011-1104-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Accepted: 09/28/2011] [Indexed: 02/04/2023]
Abstract
Insulin-like growth factor binding protein-6 (IGFBP-6) is a member of the insulin-like growth factor binding protein family, which has both Insulin-like growth factor-dependent and independent effects on cell growth. In previous studies, we have shown that recombinant IGFBP-6 could be translocated into the cell nucleus. But the effect in the nucleus of IGFBP-6 is not clear. In the present study, we use multiple methodologies including Glutathione S-transferase pull-down assay, co-immunoprecipitation, fluorescence resonance energy transfer to demonstrate that IGFBP-6 can directly interact with thyroid hormone receptor alpha 1 (TRα1) in vitro and in vivo. We also demonstrate that the DNA-binding domains and Ligand-binding domains of TRα1 and N-terminal domains and C-terminal domains of IGFBP-6 are involved in the interaction. This interaction also can block the formation of TR: retinoid X receptor heterodimers. Furthermore, immunofluorescence co-localization studies show IGFBP-6 and TRα1 could co-localize in the nucleus of the cells. Reporter gene experiment shows that IGFBP-6 negatively regulates the growth hormone promoter activity induced by ligand activated TRα1. Moreover, real-time RT-PCR demonstrates that IGFBP-6 could inhibit the osteocalcin mRNA transcription induced by Triiodothyronine (3,3',5-Triiodo-L-thyronine, T3) in osteoblastic cells. Finally, alkaline phosphatase activity was significantly decreased in osteoblastic cells when the cells were transfected with IGFBP-6 in the presence of T3. In conclusion, these studies provide evidence that overexpression of IGFBP-6 suppresses osteoblastic differentiation regulated by TR in the present of T3.
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Affiliation(s)
- Jia Qiu
- National Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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Monfoulet LE, Rabier B, Dacquin R, Anginot A, Photsavang J, Jurdic P, Vico L, Malaval L, Chassande O. Thyroid hormone receptor β mediates thyroid hormone effects on bone remodeling and bone mass. J Bone Miner Res 2011; 26:2036-44. [PMID: 21594896 DOI: 10.1002/jbmr.432] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Excess thyroid hormone (TH) in adults causes osteoporosis and increases fracture risk. However, the mechanisms by which TH affects bone turnover are not elucidated. In particular, the roles of thyroid hormone receptor (TR) isotypes in the mediation of TH effects on osteoblast-mediated bone formation and osteoclast-mediated bone resorption are not established. In this study we have induced experimental hypothyroidism or hyperthyroidism in adult wild-type, TRα- or TRβ-deficient mice and analyzed the effects of TH status on the structure and remodeling parameters of trabecular bone. In wild-type mice, excess TH decreased bone volume and mineralization. High TH concentrations were associated with a high bone-resorption activity, assessed by increased osteoclast surfaces and elevated concentrations of serum bone-resorption markers. Serum markers of bone formation also were higher in TH-treated mice. TRα deficiency did not prevent TH action on bone volume, bone mineralization, bone formation, or bone resorption. In contrast, TRβ deficiency blocked all the early effects of excess TH observed in wild-type mice. However, prolonged exposure to low or high TH concentrations of TRβ-deficient mice induced mild modifications of bone structure and remodeling parameters. Together our data suggest that TRβ receptors mediate the acute effects produced by transient changes of TH concentrations on bone remodeling, whereas TRα receptors mediate long-term effects of chronic alterations of TH metabolism. These data shed new light on the respective roles of TRs in the control of bone metabolism by TH.
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Linares GR, Xing W, Burghardt H, Baumgartner B, Chen ST, Ricart W, Fernández-Real JM, Zorzano A, Mohan S. Role of diabetes- and obesity-related protein in the regulation of osteoblast differentiation. Am J Physiol Endocrinol Metab 2011; 301:E40-8. [PMID: 21467300 PMCID: PMC3129842 DOI: 10.1152/ajpendo.00065.2011] [Citation(s) in RCA: 10] [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] [Indexed: 01/17/2023]
Abstract
Although thyroid hormone (TH) is known to exert important effects on the skeleton, the nuclear factors constituting the TH receptor coactivator complex and the molecular pathways by which TH mediates its effects on target gene expression in osteoblasts remain poorly understood. A recent study demonstrated that the actions of TH on myoblast differentiation are dependent on diabetes- and obesity-related protein (DOR). However, the role of DOR in osteoblast differentiation is unknown. We found DOR expression increased during in vitro differentiation of bone marrow stromal cells into osteoblasts and also in MC3T3-E1 cells treated with TH. However, DOR expression decreased during cellular proliferation. To determine whether DOR acts as a modulator of TH action during osteoblast differentiation, we examined whether overexpression or knockdown of DOR in MC3T3-E1 cells affects the ability of TH to induce osteoblast differentiation by evaluating alkaline phosphatase (ALP) activity. ALP activity was markedly increased in DOR-overexpressing cells treated with TH. In contrast, loss of DOR dramatically reduced TH stimulation of ALP activity in MC3T3-E1 cells and primary calvaria osteoblasts transduced with lentiviral DOR shRNA. Consistent with reduced ALP activity, mRNA levels of osteocalcin, ALP, and Runx2 were decreased significantly in DOR shRNA cells. In addition, a common single nucleotide polymorphism (SNP), DOR1 found on the promoter of human DOR gene, was associated with circulating osteocalcin levels in nondiabetic subjects. Based on these data, we conclude that DOR plays an important role in TH-mediated osteoblast differentiation, and a DOR SNP associates with plasma osteocalcin in men.
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Affiliation(s)
- Gabriel R Linares
- Musculoskeletal Disease Center, Jerry L. Pettis Memorial Veterans Affairs Medical Center, Loma Linda, California 92357, USA
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Susperreguy S, Muñoz L, Tkalenko NY, Mascanfroni ID, Alamino VA, Montesinos MM, Masini-Repiso AM, Miras MB, Pellizas CG. Growth hormone treatment in children with idiopathic short stature: correlation of growth response with peripheral thyroid hormone action. Clin Endocrinol (Oxf) 2011; 74:346-53. [PMID: 21091751 DOI: 10.1111/j.1365-2265.2010.03924.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Idiopathic short stature (ISS) describes short children with normal GH secretion. Although GH treatment increases their heights, growth response to the therapy differs among patients. Thyroid hormones (TH) are essential for longitudinal growth acting mainly through TH receptors (TR) α and β. We have previously reported that GH treatment reduced peripheral TH action in Turner Syndrome by TR down-regulation. The aims of the study were to assess the effect of GH treatment to ISS on peripheral TH action and the correlation between thyroid status and growth response to the therapy. SUBJECTS, DESIGN AND MEASUREMENTS: Eighteen normal (control) and twenty-five ISS children were enrolled and evaluated before and after 12 months of life time (control) or 12 months of GH therapy (ISS). Fasting blood was used for serum biochemical evaluations, peripheral blood mononuclear cells for TR mRNA determination by QRT-PCR and growth parameters by standard methods. RESULTS GH treatment modified neither TR mRNA levels nor serum markers of TH action in ISS evaluated as a whole group. However, the individual change in TRβ mRNA levels correlated to the change in sex hormone-binding globulin (SHBG) levels after GH therapy. The growth response to GH correlated positively with the change in TRα mRNA level and negatively with that in TRβ mRNA, TSH and SHBG levels. The change in each TR mRNA isoform after GH treatment correlated negatively with its own basal level. CONCLUSIONS GH therapy induced individual changes in TR expression in ISS that correlated with their growth response. The basal TR mRNA level could predetermine the change in TR expression and therefore the sensitivity to GH treatment.
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Affiliation(s)
- Sebastián Susperreguy
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI-CONICET), Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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Varga F, Rumpler M, Zoehrer R, Turecek C, Spitzer S, Thaler R, Paschalis E, Klaushofer K. T3 affects expression of collagen I and collagen cross-linking in bone cell cultures. Biochem Biophys Res Commun 2010; 402:180-5. [PMID: 20707983 PMCID: PMC3025330 DOI: 10.1016/j.bbrc.2010.08.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 08/06/2010] [Indexed: 11/16/2022]
Abstract
Thyroid hormones (T3, T4) have a broad range of effects on bone, however, its role in determining the quality of bone matrix is poorly understood. In-vitro, the immortalized mouse osteoblast-like cell line MC3T3-E1 forms a tissue like structure, consisting of several cell layers, whose formation is affected by T3 significantly. In this culture system, we investigated the effects of T3 on cell multiplication, collagen synthesis, expression of genes related to the collagen cross-linking process and on the formation of cross-links. T3 compared to controls modulated cell multiplication, up-regulated collagen synthesis time and dose dependently, and stimulated protein synthesis. T3 increased mRNA expressions of procollagen-lysine-1,2-oxoglutarate 5-dioxygenase 2 (Plod2) and of lysyloxidase (Lox), both genes involved in post-translational modification of collagen. Moreover, it stimulated mRNA expression of bone morphogenetic protein 1 (Bmp1), the processing enzyme of the lysyloxidase-precursor and of procollagen. An increase in the collagen cross-link-ratio Pyr/deDHLNL indicates, that T3 modulated cross-link maturation in the MC3T3-E1 culture system. These results demonstrate that T3 directly regulates collagen synthesis and collagen cross-linking by up-regulating gene expression of the specific cross-link related enzymes, and underlines the importance of a well-balanced concentration of thyroid hormones for maintenance of bone quality.
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Affiliation(s)
- F. Varga
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
| | - M. Rumpler
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
| | - R. Zoehrer
- Flinders University, School of Chemistry and Physics, Australia
| | - C. Turecek
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
| | - S. Spitzer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
| | - R. Thaler
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
| | - E.P. Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
| | - K. Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 4th Medical Department, Hanusch Hospital, Vienna, Austria
- Corresponding author. Address: Ludwig Boltzmann Institute of Osteology, 4th Medical Department, Hanusch Hospital, Heinrich Collin-Str. 30, A-1140 Vienna, Austria. Fax: +43 1 91021 86929.
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48
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Conti MI, Martínez MP, Olivera MI, Bozzini C, Mandalunis P, Bozzini CE, Alippi RM. Biomechanical performance of diaphyseal shafts and bone tissue of femurs from hypothyroid rats. Endocrine 2009; 36:291-8. [PMID: 19669949 DOI: 10.1007/s12020-009-9212-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 05/21/2009] [Accepted: 06/08/2009] [Indexed: 12/28/2022]
Abstract
The bone changes in hypothyroidism are characterized by a low bone turnover with a reduced osteoid apposition and bone mineralization rate, and a decreased osteoclastic resorption in cortical bone. These changes could affect the mechanical performance of bone. The evaluation of such changes was the object of the present investigation. Hypothyroidism was induced in female rats aged 21 days through administration of propylthiouracil in the drinking water for 70 days (HT group). Controls were untreated rats (C group). Right femur mechanical properties were tested in 3-point bending. Structural (load bearing capacity and stiffness), geometric (cross-sectional area and moment of inertia) and material (modulus of elasticity) properties were evaluated. The left femur was ashed for calcium content determination. Plasma T(4) concentration was significantly decreased in HT rats. Body and femur weight and length in HT rats were also reduced. Femoral calcium concentration in ash was higher in HT than in C rats. However, the femoral calcium mass was significantly lower in HT than in C rats because of the reduced femoral size seen in the former. The stiffness of bone material was higher in HT than in C rats, while the bone geometric properties were significantly lower. The "load capacity" was between 30 and 50% reduced in the HT group, although, the differences disappeared when the values were normalized per 100-g body weight. The lowered biomechanical ability observed in the femoral shafts of HT rats seems to be the expression of a diminished rate of growth. Qualitative alterations in the intrinsic mechanical properties of bone tissue were observed in HT rats, probably because the mineral content and the modulus of elasticity were positively affected. The cortical bone of the HT rat thus appears as a bone with a higher than normal strength and stiffness relative to body weight, probably due to improvement of bone material quality due to an increased matrix calcification.
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Affiliation(s)
- María I Conti
- Department of Physiology, Faculty of Odontology, University of Buenos Aires, Buenos Aires, Argentina
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49
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Allori AC, Sailon AM, Warren SM. Biological basis of bone formation, remodeling, and repair-part I: biochemical signaling molecules. TISSUE ENGINEERING PART B-REVIEWS 2009; 14:259-73. [PMID: 18665803 DOI: 10.1089/ten.teb.2008.0082] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The bony biochemical environment is an active and dynamic system that permits and promotes cellular functions that lead to matrix production and ossification. Each component is capable of conveying important regulatory cues to nearby cells, thus effecting gene expression and changes at the cytostructural level. Here, we review the various signaling molecules that contribute to the active and dynamic nature of the biochemical system. These components include hormones, cytokines, and growth factors. We describe their role in regulating bone metabolism. Certain growth factors (i.e., TGF-beta, IGF-1, and VEGF) are described in greater detail because of their potential importance in developing successful tissue-engineering strategies.
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Affiliation(s)
- Alexander C Allori
- Institute of Reconstructive Plastic Surgery, New York University Medical Center, New York, New York, USA
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50
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Asai S, Cao X, Yamauchi M, Funahashi K, Ishiguro N, Kambe F. Thyroid hormone non-genomically suppresses Src thereby stimulating osteocalcin expression in primary mouse calvarial osteoblasts. Biochem Biophys Res Commun 2009; 387:92-6. [PMID: 19563782 DOI: 10.1016/j.bbrc.2009.06.131] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Accepted: 06/25/2009] [Indexed: 10/20/2022]
Abstract
To provide further insights into non-genomic action of thyroid hormone (T3), we investigated whether Src is under control of T3 in primary calvarial osteoblasts prepared from neonatal mice. Treatment of the cells with T3 rapidly decreased Src Y416 autophosphorylation, followed by the decrease of phosphorylated extracellular signal-regulated kinases, suggesting that T3 non-genomically suppresses Src activity. Furthermore, this T3 effect was rapid and persistent, and was associated with the increased expression of osteocalcin (OC). To confirm the contribution of Src to the effect of T3 on OC expression, a constitutively active Src (Y527F) was overexpressed in osteoblasts. In such cells, Y416 phosphorylation was markedly increased even in the presence of T3, and T3-dependent expression of OC was markedly attenuated. The present study demonstrates a novel, non-genomic action of T3 in primary mouse osteoblasts, by which T3 suppresses Src thereby stimulating OC expression.
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Affiliation(s)
- Shuji Asai
- Department of Endocrinology, Research Institute of Environmental Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
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