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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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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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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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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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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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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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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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-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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Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
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Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
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Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
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Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
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Department of Veterans Affairs Medical Center, Long Beach, Long Beach, California, USA
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Department of Drug Treatment, Sahlgrenska University Hospital, Region Västra Götaland, 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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Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA
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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
Center for Healthy Aging Research, Oregon State University, Corvallis, Oregon, USA
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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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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
Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium
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Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium
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Department of Nephrology, University Hospitals Leuven, Leuven, Belgium
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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
Bone Pathology Unit, Angers University Hospital, Angers Cedex, France
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Rheumatology Department, Angers University Hospital, Angers Cedex, France
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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
Faculty of Dentistry, McGill University, Montreal, Quebec, Canada
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Département de Mathématiques, Université du Québec à Montréal, Montréal, Québec, Canada
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Départements de Médecine et de Biochimie et Médecine Moléculaire, Université de Montréal, Montréal, Québec, Canada
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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
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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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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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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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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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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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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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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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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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