Bone Abstracts

It is still unknown where from osteoblasts are recruited during remodeling of adult human cancellous bone. Still, it is often suggested that they originate from perivascular osteoprogenitors in the bone marrow (BM). Here we propose also the existence of a layer of osteoprogenitors at the periphery of the BM. This proposal is based on electron and light microscopy of the bone surface and of the neighboring BM in human iliac crest biopsies, where we quantified cell densities, ce...

Differentiation of osteoclast progenitor cells into mononucleated TRAcP+ pre-osteoclasts occurs in the bone marrow. But how are these cells dispatched to the future bone resorption sites? We hypothesized that the collagen type III/I-rich reticulin network of the bone marrow might provide a structural framework for localization and migration of differentiating pre-osteoclasts towards the bone surface. Therefore, adjacent sections from decalcified paraffin-embedded iliac crest b...

The pathophysiology of secondary hyperparathyroidism (II HPT) in the absence of renal disease is mainly due to lack of vitamin D, calcium deficiency being extremely rare. In case of chronic kidney disease (CKD), phosphate retention and increase in secretion of FGF23 by bone are among the earliest factors associated with II HPT occurrence. Then, the deficit in calcitriol synthesis induces lack of calcium intestinal absorption which worsens II HPT. As renal function declines, th...

Blood vessels and bone display spatial and functional relationships. While the coupling of angiogenesis to bone formation during modeling situations is well documented, the vessels roles in bone remodeling, although widely acknowledged, remain poorly explored. In order to image and quantify the bone vessel network in rodents, we contrasted the vascular bed with barium sulfate, followed by histology or either conventional or synchrotron radiation micro-computed tomography. We s...

Background: It is inadequate to use the patient’s age and sex alone to estimate physicians’ workload in the primary setting. The extent to which the morbidity burden of osteoporosis patients would account of the utilization of primary care services has not been examined.Aim: We analyzed the number of face-to-face visits of osteoporosis patients visiting Danish GP clinics and aimed to assess what proportion of primary care services variation are...

Human mesenchymal stromal cells (hMSC) have been investigated as a clinical therapy to promote tissue repair. However, the disappearance of grafted cells soon after engraftment suggests that hMSC could principally act as initiators of repair through paracrine mechanisms.The aim of this study was to evaluate the relative contribution of grafted hMSC and host cells in promoting bone tissue repair. We isolated hMSC from three bone marrow (BM) donors, then d...

Bone therapeutics is a bone cell therapy company addressing high unmet medical needs in the field of bone fracture repair, more specifically in non-union and delayed-union fractures where the bone repair process is impaired. The company has developed a unique allogeneic osteoblastic cell product (ALLOB®) derived from bone marrow which is currently tested in humans in the indication of delayed-union fractures. The purpose of the study was to directly compare ALL...

Aim: To determine the safety, tolerability, pharmacokinetics and pharmacodynamics of the cathepsin K inhibitor MIV-711.Methods: A double-blind, placebo-controlled, randomized study in 27 healthy subjects of both genders. Single ascending doses 20–600 mg were investigated for adverse events, clinical chemistry, vital signs, ECG parameters, pharmacokinetics, and serum levels of CTX-I.Results: MIV-711 was well tolerated with no a...

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Bisphosphonates (BP) are used as anti-resorptive drugs in benign (osteoporosis) and malignant (myeloma, bone metastasis) bone diseases. Their high affinity for biominerals allows prolonged storage within bone. However information about molecular impact of BP on bone quality are missing. Better understanding of BP properties to optimize their clinical use is needed. The aim of this study was thus to investigate human bone physicochemical changes upon BP uptake.<p class="abs...