Bone Abstracts

Objectives: CKD in children is associated with suppressed body growth. Physical activity has been previously shown to increase expression of IGF1 signaling in muscles of rats with CKD, but the effects of this intervention on bone tissue have not been investigated yet. The purpose of this study was to examine the effects of aerobic exercise on CKD related bone disease.Methods: Twenty-day old/50 g male rats underwent a two step subtotal nephrectomy (Nx) or...

Aim: Alendronate enhances bone morphogenetic proteins (BMP)-mediated osteoblast differentiation. A balanced regulation of inhibitors of DNA binding/differentiation (Ids) plays an important role in BMP-induced osteoblast differentiation. However, there are no studies on the possible roles of Id genes in alendronate-induced osteoblast differentiation. This study investigated the effect of alendronate on the expression of Id genes in osteoblast differentiation. ...

Fibroblast growth factor-23 (FGF23) is a bone derived phosphate-regulating hormone which is elevated in hypophosphataemic rickets. Recent findings demonstrate iron deficiency as a potential mediator of FGF23 expression and murine studies have shown in utero effects of maternal iron deficiency leading to increased FGF23 concentration and disordered bone development (Clinkenbeard. JBMR 2013). Children with rickets in rural Gambia, West Africa, have high prevalences of i...

Nitrogen-containing bisphosphonates (N-BPs) are used to treat osteolytic bone metastases. N-BPs have been previously shown to enter macrophages via macropinocytosis, but the mechanisms how they are taken up by breast cancer cells are so far incompletely known. In breast cancer primary tumours N-BPs have been shown, by other researchers, to be bound to micro-calcifications present in the tumour stroma. In our study we have characterized how different N-BP formulations, free, ca...

Objectives: Murine studies have shown that iron deficiency during pregnancy can cause abnormal phosphate and bone metabolism in offspring by elevating concentrations of fibroblast growth factor-23 (FGF23). FGF23 exists in plasma as an intact phosphate- and vitamin D-regulating hormone and its C-terminal fragment, a cleavage product that possibly antagonises the intact hormone. These findings are pertinent to low-income countries, where the prevalence of iron deficiency in preg...

Objectives: The regulation of fibroblast growth factor 23 (FGF23) metabolism during infancy is inadequately characterized. We previously observed a distinct sex difference in intact FGF23 at 3 months of age. In this study we aimed to further examine the role of sex and iron status in FGF23 metabolism in 1-year-old children.Methods: This was a cross-sectional study including 731 1-year-old Caucasian children participating the Vitamin D intervention in inf...

Introduction: Although previously babies with genetic type II Osteogenesis Imperfecta (OI) would not have expected to survive, they are now surviving beyond the neonatal period. We describe two such children who have survived beyond infancy.Aim & methods: To identify differences in motor developmental progress between a typical severe (type III) OI child vs two Type II OI children and suggest possible causes. Medical, nursing and therapy (physiothera...

Background: Glucocorticoid immune suppression in kidney transplanted children jeopardizes optimal bone health recovery. So far, there are no studies that evaluate the effect of transplant and corticoid in bone parameters separately.Objective: To determine the effect of early corticosteroid withdrawal in bone parameters.Methods: Randomized, controlled study; two groups: corticosteroid withdrawal (at the 6th day post-transplant, then...

Twelve different mutations in TNFRSF11A (encoding the RANK receptor) have been associated with osteoclast-poor autosomal recessive osteopetrosis in patients. Two truncated RANK proteins resulting from substitution mutations (W434X and G280X), identified in two infants, cause loss of the intracellular oligomerisation motif and in the case of the G280X mutation the TRAF6 binding domain. A third mutation was identified in a 10-year-old patient and is a frameshift mutatio...

Insulin-like growth factor 1 (IGF-1) is known to be a predictor of future osteoporotic fractures. Insulin-like growth factor binding protein 1 (IGFBP1) regulates the bioavailability of IGF-1 and thus in reason IGFBP1 also could be a fracture predictor. To our knowledge there are no previous studies published on the relation between the serum concentration of IGFBP1 and fractures.This is a population-based prospective cohort study on 351 Swedish women age...