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A Iida-Klein Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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S Shou Lu Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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R Kapadia Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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M Burkhart Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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A Moreno Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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D W Dempster Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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R Lindsay Regional Bone and
Clinical Research Centers, Helen Hayes Hospital, West Haverstraw, New York, USA
Scanco USA Inc., Wayne, Pennsylvania, USA
Departments of Clinical Pathology and
Medicine, Columbia University, College of Physicians and Surgeons, New York, New York, USA

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Parathyroid hormone (PTH) stimulates bone resorption as well as bone formation in vivo and in organ culture. The catabolic actions of PTH have been recognized in patients with hyperparathyroidism, or with acute infusion of the N-terminal 1–34 fragment of human PTH (hPTH1–34). Whereas the anabolic actions of daily injection with PTH have been well studied in both humans and mice, the catabolic actions of PTH on murine bone remain to be defined. To do this we sought to create a model with short-term, sustained hyperparathyroidism using osmotic infusion pumps. We treated 10-week-old female C57BL/J6 mice with continuous infusion of hPTH1–34 (8.1 pmol/0.25 μl per h, equivalent to 40 μg/kg per day) or vehicle for 2 weeks, using Alzet osmotic pumps. Bone mineral density (BMD), serum total calcium, hPTH1–34, mouse intact PTH (mPTH1–84), osteocalcin and mouse tartrate-resistant acid phosphatase (mTRAP) activity, and microarchitectural variables of the distal femur were measured. Separately, we compared the effects of intermittent daily injection of hPTH1–34 (40 μg/kg per day) with continuous infusion of hPTH1–34 on BMD and bone markers. Exogenous hPTH1–34 was detected only in the PTH-infused mice. Both intermittent and continuous treatment with hPTH1–34 markedly suppressed endogenous mPTH1–84, but only the latter induced hypercalcemia. Daily PTH injection significantly increased both serum osteocalcin and mTRAP, while continuous PTH infusion showed a strong trend to stimulate mTRAP, with a slight but non-significant increase in osteocalcin. There were significant differences in BMD at all sites between animals treated with the same daily dose of intermittent and continuous hPTH1–34. Microcomputed tomography (μCT) analysis of the distal femurs revealed that hPTH1–34 infusion significantly decreased trabecular connectivity density (P<0.05). Thus, the murine bone response to continuous PTH infusion was quite different from that seen with daily PTH injection. Short-term infusion of hPTH1–34 appears to be a good model to study the mechanisms underlying the catabolic action of PTH in mice.

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K L Gustafsson Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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K H Nilsson Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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H H Farman Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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A Andersson Center for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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V Lionikaite Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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P Henning Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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J Wu Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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S H Windahl Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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U Islander Center for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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S Movérare-Skrtic Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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K Sjögren Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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H Carlsten Center for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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J-Å Gustafsson Center for Nuclear Receptors and Cell Signaling, Department of Biology and Biochemistry, University of Houston, Houston, Texas, USA

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C Ohlsson Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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M K Lagerquist Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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-resolution microcomputed tomography High-resolution microcomputed tomography (μCT) analysis was performed on the vertebrae L 5 and femur using an 1172 model μCT (Bruker MicroCT, Aartselaar, Belgium) as previously described ( Moverare-Skrtic et al . 2014 ). The

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Karin L Gustafsson Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Sofia Movérare-Skrtic Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Helen H Farman Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Cecilia Engdahl Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Petra Henning Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Karin H Nilsson Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Julia M Scheffler Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Edina Sehic Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Ulrika Islander Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Ellis Levin Division of Endocrinology, Department of Medicine, University of California, Irvine, Irvine, California, USA
Department of Veterans Affairs Medical Center, Long Beach, Long Beach, California, USA

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Claes Ohlsson Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
Department of Drug Treatment, Sahlgrenska University Hospital, Region Västra Götaland, Gothenburg, Sweden

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Marie K Lagerquist Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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bone parameters Dual-energy X-ray absorptiometry Analyses of total body areal bone mineral density (aBMD) were performed using a Lunar PIXImus mouse densitometer (Wipro GE Healthcare). High-resolution microcomputed tomography High

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Kenneth A Philbrick Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA

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Carmen P Wong Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA

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Adam J Branscum Biostatistics Program, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA

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Russell T Turner Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA
Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA

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Urszula T Iwaniec Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA
Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA

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weighed. Femora were removed, fixed for 24 h in 10% buffered formalin and stored in 70% ethanol for microcomputed tomography and histomorphometric analysis. Tibiae and hypothalami were removed, frozen in liquid nitrogen and stored at −80°C for mRNA

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Russell T Turner Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA
Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA

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Kenneth A Philbrick Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA

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Carmen P Wong Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA

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Adam J Branscum Biostatistics Program, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA

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Urszula T Iwaniec Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA
Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA

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of bone turnover. Uteri and abdominal WAT were excised and weighed. Femora and fifth lumbar vertebrae were collected, stored in 70% ethanol and evaluated using dual-energy x-ray absorptiometry (DXA) and microcomputed tomography (μCT). Serum

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Vikte Lionikaite Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Karin L Gustafsson Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Anna Westerlund Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Sara H Windahl Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Antti Koskela Department of Anatomy and Cell Biology, Medical Research Center, University of Oulu, Oulu, Finland

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Juha Tuukkanen Department of Anatomy and Cell Biology, Medical Research Center, University of Oulu, Oulu, Finland

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Helena Johansson Institute for Health and Aging, Catholic University of Australia, Melbourne, Australia

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Claes Ohlsson Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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H Herschel Conaway Department of Physiology and Biophysics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA

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Petra Henning Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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Ulf H Lerner Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden

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in all analyses. Data are displayed as fold change relative to control. Assessment of bone parameters Peripheral quantitative computed tomography (pQCT) and microcomputed tomography (µCT) Peripheral quantitative computed tomography (pQCT

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K David Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven
Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium

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V Dubois Basic and Translational Endocrinology, Department of Basic and Applied Medical Sciences, UGent, Ghent, Belgium

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A Verhulst Laboratory of Pathophysiology, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium

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V Sommers Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium

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D Schollaert Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven

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L Deboel Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven

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K Moermans Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven

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G Carmeliet Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven

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P D’Haese Laboratory of Pathophysiology, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium

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D Vanderschueren Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven
Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium

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F Claessens Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium

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P Evenepoel Nephrology and Renal Transplantation Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
Department of Nephrology, University Hospitals Leuven, Leuven, Belgium

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B Decallonne Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven
Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium

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. Testosterone levels were analyzed via LC-MS/MS ( Antonio et al. 2018 ). Luteinizing hormone (LH) levels were determined by ultrasensitive ELISA ( Steyn et al. 2013 ). Microcomputed tomography L5 vertebral bodies and right tibiae were scanned ex

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Guillaume Mabilleau Groupe d’Etudes Remodelage Osseux et bioMatériaux, GEROM, SFR 42-08, Université d’Angers, IRIS-IBS Institut de Biologie en Santé, CHU d’Angers, Angers Cedex, France
Bone Pathology Unit, Angers University Hospital, Angers Cedex, France

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Benoit Gobron Groupe d’Etudes Remodelage Osseux et bioMatériaux, GEROM, SFR 42-08, Université d’Angers, IRIS-IBS Institut de Biologie en Santé, CHU d’Angers, Angers Cedex, France
Rheumatology Department, Angers University Hospital, Angers Cedex, France

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Aleksandra Mieczkowska Groupe d’Etudes Remodelage Osseux et bioMatériaux, GEROM, SFR 42-08, Université d’Angers, IRIS-IBS Institut de Biologie en Santé, CHU d’Angers, Angers Cedex, France

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Rodolphe Perrot Service Commun d’Imageries et d’Analyses Microscopiques, SCIAM, SFR 42-08, Université d’Angers, IRIS-IBS Institut de Biologie en Santé, CHU d’Angers, Angers Cedex, France

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Daniel Chappard Groupe d’Etudes Remodelage Osseux et bioMatériaux, GEROM, SFR 42-08, Université d’Angers, IRIS-IBS Institut de Biologie en Santé, CHU d’Angers, Angers Cedex, France
Bone Pathology Unit, Angers University Hospital, Angers Cedex, France
Service Commun d’Imageries et d’Analyses Microscopiques, SCIAM, SFR 42-08, Université d’Angers, IRIS-IBS Institut de Biologie en Santé, CHU d’Angers, Angers Cedex, France

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to the manufacturer recommendations. Microcomputed tomography X-ray microcomputed tomography (MicroCT) analyses of the abdomen were performed to measure abdominal fat volume, that represents a good indicator of whole-body fat mass ( Judex et

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Iris Boraschi-Diaz Shriners Hospital for Children-Canada, Montreal, Quebec, Canada
Faculty of Dentistry, McGill University, Montreal, Quebec, Canada

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Josephine T Tauer Shriners Hospital for Children-Canada, Montreal, Quebec, Canada

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Omar El-Rifai Unité de Recherche en Physiologie Intégrative et Moléculaire, Institut de Recherches Cliniques de Montréal, Montréal, Québec, Canada

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Delphine Guillemette Shriners Hospital for Children-Canada, Montreal, Quebec, Canada
Département de Mathématiques, Université du Québec à Montréal, Montréal, Québec, Canada

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Geneviève Lefebvre Département de Mathématiques, Université du Québec à Montréal, Montréal, Québec, Canada

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Frank Rauch Shriners Hospital for Children-Canada, Montreal, Quebec, Canada

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Mathieu Ferron Unité de Recherche en Physiologie Intégrative et Moléculaire, Institut de Recherches Cliniques de Montréal, Montréal, Québec, Canada
Départements de Médecine et de Biochimie et Médecine Moléculaire, Université de Montréal, Montréal, Québec, Canada

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Svetlana V Komarova Shriners Hospital for Children-Canada, Montreal, Quebec, Canada
Faculty of Dentistry, McGill University, Montreal, Quebec, Canada

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EchoMRI model ET-040, version 11,06,22 (EchoMRI LLC). Microcomputed tomography (micro CT) It was performed on right femurs of 4-week-old mice using Skyscan 1272 at a voxel size of 5 μm. Scan parameters included a 0.40-degree increment angle, 3 frames

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Muneaki Ishijima Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Kunikazu Tsuji Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Susan R Rittling Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Teruhito Yamashita Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Hisashi Kurosawa Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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David T Denhardt Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Akira Nifuji Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Yoichi Ezura Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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Masaki Noda Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10, Kanda-Surugadai 2-Chome, Chiyoda-Ku, Tokyo 101-0062, Japan
Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082, USA
Department of Orthopaedics, School of Medicine, Juntendo University, Tokyo 113-8421, Japan

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. Fractional trabecular bone volume (BV/TV) was quantified based on the image of microcomputed tomography (μCT) pictures of the tibiae after 1 week of either tail suspension (Susp) or loading (Load) in wild-type (wild-type) or OPN−/− mice (OPN−/−). Data are

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