Bone Abstracts

Objectives: A role for glucose-dependent insulinotropic polypeptide (GIP) in controlling extracellular bone matrix deposition and maturation has previously been evidenced in GIP receptor knock-out mice. However, as the GIP receptor is expressed in several tissues other than bone it was difficult to ascertain whether the modifications of extracellular bone matrix were due to direct effects on osteoblasts or indirect through regulation of signals originating from other tissues. ...

Objectives: A role for glucose-dependent insulinotropic polypeptide (GIP) in controlling bone mass and strength has previously been reported. However, the rapid degradation of GIP in the bloodstream by the dipeptidyl peptidase-4 enzyme precludes therapeutic use. To circumvent this problem, a series of N-terminally modified GIP agonists have been developed. The aim of the present study was to investigate the effects of 28-day treatment with N-AcGIP on bone microarchitecture and...

Objectives: Glucagon-like peptide 1 is secreted by intestinal L-cells into the blood supply in response to nutrients in the intestine. Although osteoblasts express the GLP-1 receptor (GLP-1R), the main action of the GLP-1/GLP-1R pathway in bone physiology and bone quality is unknown. The aim of the present study was to investigate bone strength and quality in a mouse model of GLP-1R deficiency.Materials/methods: Eight 16 weeks-old GLP-1R knock-out male m...

Objectives: Glucose-dependent insulinotropic polypeptide (GIP) is secreted by intestinal K-cells into the blood supply in response to nutrient ingestion and absorption. Although osteoblasts and osteoclasts express the GIP receptor (GIPR), the main action of the GIP/GIPR pathway in bone physiology and bone quality is unknown. The aim of the present study was to investigate bone quality in a mouse model of GIPR deficiency.Materials/methods: Eleven 16 weeks...

An IgM monoclonal gammopathy (MGUS) is often the first sign of a lymphomonocytic B-lymphoma (Waldenström macroglobulinemia-WD). Osteolytic lesions can occur in B cell malignancies (WD, hairy cell leukemia, LLC\..) but are less frequent than in myeloma. In addition, bone remodeling in WD is poorly understood. However, an osteoporosis is often observed in MGUS patients. We studied a series of bone biopsies performed in patients with an IgM gammopathy by histomorphometry, mi...

Objectives: A role for the gut hormones glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) in controlling bone mass and strength has previously been reported. However, lack of one gut hormone is compensated by an elevated sensitivity to the other in single receptor knockout mice. As such the exact role of GIP and GLP-1 in bone is unclear. The aims of the present study were to assess bone mass and strength in mice with functional deletion of ...

Objectives: Most osteolytic tumors are in fact mixed and contain an osteoblastic component associated with the predominant osteolytic areas. This metaplastic woven bone can be evidenced on X-rays as blurred white areas but is always evidenced by histological analysis even in the absence of radiological expression. Metaplastic bone formation reflects the activation of new osteoblasts, the stimulation of the dormant lining cells due to the release of growth factors buried in the...