Bone Abstracts

Biological calcification is a regulated process in which different types of tissues, cells and biomolecules participate in the coordination and regulation of the metabolic events involved in accumulating large amounts of calcium phosphate. This process could be speeded up using carbon nanotubes (CNTs) systems. The objective of our study was to compare cell growth and formation of mineralized matrix nodules by osteoblasts grown in plastic and in titanium (Ti) discs surfaces. Th...

The biomineralization process is initiated inside matrix vesicles (MVs), with phosphate and calcium ions crystallizing as hydroxyapatite. This process is accomplished by the activities of several proteins, such as annexins (e.g. AnxV) that mediates Ca2+ influx into MVs and tissue-nonspecific alkaline phosphatase (TNAP), a phosphomonohydrolase that uses ATP and PPi as substrates. Dipalmitoylphosphatidylcholine (DPPC) and dipalmitoylphosphatidylserine (DPPS...

Extracellular nucleotides stimulate both the formation and resorptive activity of osteoclasts. Ecto-nucleotide pyrophosphatase/phosphodiesterases (NPPs) hydrolyse extracellular nucleotide triphosphates to their corresponding monophosphate and pyrophosphate (PPi). We investigated if osteoclasts express functional NPPs and whether Enpp1 gene deletion influenced osteoclast formation and activity. Osteoclasts were formed from the bone marrow of 8 and 15 week old knockou...

Medial vascular calcification (MVC) is a pathological condition common to a variety of diseases, including chronic kidney disease, diabetes, obesity, generalized arterial calcification of infancy, arterial calcification due to deficiency of CD73, and Keutel syndrome. These diseases share the common feature of tissue-nonspecific alkaline phosphatase (TNAP) upregulation in the vasculature. We developed a mouse model that overexpresses human TNAP in vascular smooth muscle cells, ...

Background: Final stature is a result of concomitant growth hormone (GH)-IGF1 axis integrity, a healthy environment and genetic background. Occasionally, growth occurs despite remarkable impairment in hormone profile. Presenting problem: An uncommon case of longitudinal growth in a boy with very low IGF1 concentrations and clinical diagnosis of osteopetrosis. Clinical management: We report on the case of a 19 year-old male patient with the diagnosis of osteopetrosis who had a ...

Loss of the gene encoding the secreted Wnt antagonist sclerostin results in increased bone mass in humans and mice. Administration of antibodies to sclerostin (Scl-Ab) has been shown to increase bone mineral density (BMD) by increasing bone formation and decreasing bone resorption, in both animal studies and human clinical trials. In these studies, the magnitude and rate of increase in bone formation markers, and the rate of increase of BMD, diminishes upon repeat dosing with ...

Fracture prevalence in children appears to change in recent years due to variations in physical activity and enforcement of laws that protect children within motor vehicles. However, in Mexico such variation has not been explored so far.Objective: To analyze fracture prevalence in the paediatric population of Mexico to detect patterns of change in time, between genres and among different diagnoses.Methods: We analyzed data from the...

There is a growing evidence of the association between HIV infection and fracture risk. Independently of its cause (antiretroviral therapy (ART) or HIV), what remains most important is a prompt diagnosis. Although densitometry is the gold standard, sometimes this technique is not as accurate as necessary in clinical practice. A new validated tool for early and more accurate diagnosis is presented.MethodsIn a HIV group of patients, ...

Multiple factors of risk have been described to the osteoporosis (OSP) and fractures in people infected by human immunodeficiency virus (HIV). Antiretroviral treatment has changed the vital prognosis of these patients, nevertheless seems that antiretroviral treatments can cause a greater loss of bone mineral density (BMD). Experts support the use of densitometry screening for HIV-infected postmenopausal women and men older than 50 years.Objectives: To ev...

Objectives: To assess safety and clinical efficacy during 1–34 parathyroid hormone treatment (1–34-PTH) in real clinical practice; to describe fracture outcome after 1–34-PTH discontinuation in real clinical practice.Methods: We performed an observational study in real clinical practice of all consecutive severe osteoporosis (sOP) patients referred to our Rheumatology Department from Feb’10 until Jan’14. All patients were referre...