Bone Abstracts

Release of RNA into the extracellular space is a newly identified means of intercellular communication operating in many organisms. Such extracellular RNAs can be released via 50–1000 nm vesicles Almost all cell types produce such extracellular vesicles (EV) and the secretion and proteins/lipids per RNA content is regulated by the producing cell. Besides release of vesicle-enclosed genetic material, cells can also release RNA in association with macromolecular protein com...

Objective: Osteogenesis imperfecta (OI) is primarily characterized by bone fragility but is also associated with lower muscle mass and function. As muscle mass and bone mass are closely linked, an intervention that increases muscle mass should also increase bone mass. Here we investigated the effect of a novel activin receptor IIB ligand trap, ACE-2494 (Acceleron Pharma), on skeletal muscle mass and bone properties in a mouse model of severe dominant OI, the Col1a1<su...

Objective: Osteocalcin, an osteoblast-derived hormone, is among the most abundant proteins in bone and is involved in the regulation of whole-body metabolism, muscle adaptation, and reproduction. High bone turnover and low bone mass are clinical hallmarks of Osteogenesis Imperfecta (OI), a bone disease mainly caused by mutations in the collagen-I gene. Recently, we have shown that growing mice with a severe dominant form of OI, Col1a1Jrt/+ mice, displayed significantly elevate...

Background: Primary tumoral calcinosis is an orphan disease. The data about the incidence of this disease, as well as clinical recommendations for treatment are not presented in the literature.Presenting problem: Two patients – 11.5 years old boy and 8 years old girl with primary tumoral calcinosis had multiple foci of the subcutaneous calcification, walking impossibility, wheel-chair condition, fatigue, high fever and equinus deformity of the left ...

We have previously demonstrated the presence of circulating mesenchymal stem cells (MSCs) in fracture patients. However, the exact time for their appearance in circulation remains unknown. Nine patients (five females, four males, age 70±12 years, range 55–89 years) with a fresh femoral neck fracture were recruited in the study, which was approved by the local ethical committee. Bone marrow (BM) sample drawn from the iliac crest of all patients served as the individua...

Histomorphometric analysis is an essential technique to measure bone formation and resorption parameters. Here we present three novel open source image analysis packages that allow the rapid semi-automated analysis of histomorphometric bone resorption, osteoid, and calcein double labelling parameters.Mice were injected with calcein 5 and 2 days before killing. Tibia and vertebrae were fixed in formalin, embedded in methylmethacrylate and the blocks secti...

The selective cathepsin K inhibitor odanacatib (ODN) is currently in development for the treatment of postmenopausal osteoporosis. Our goal was to evaluate the effects of ODN vs alendronate (ALN) on bone mass and strength of lumbar vertebrae (LV) in orchiectomized (ORX) rabbits, a model of male osteoporosis. Adult male rabbits (11 months old) were subjected to sham- (n=20) or ORX-surgery (n=24/group) for 7.5 months before dosing initiated. ORX animals were ra...

Muscle and loading force application alters bone structure and increases bone mineral density (BMD), particularly during growth. However, bone microarchitectural texture, as assessed by the trabecular bone score (TBS), changes during growth is unknown. We hypothesized that TBS would be positively correlated with growth and higher in growing girls participating in regular physical exercise.68 girls (mean age 12±0.3 years; BMI 18±2.8 kg/m2</...

Background: Progressive osseous heteroplasia (POH) (OMIM 166350) is a rare autosomal dominant condition, characterized by heterotopic ossification of the skin, subcutaneous fat and deep connective tissue. This condition is distinct from Albright’s hereditary osteodystrophy or Mccune–Albright syndrome (AHO) (OMIM 103580) and fibrodysplasia ossificans progressiva (FOP) (OMIM 135100).Presenting problem: We present an unu...

see PP36....