Searchable abstracts of presentations at key conferences on calcified tissues

ba0003pp382 | Other diseases of bone and mineral metabolism | ECTS2014

Osteogenic differentiation of fibroblast derived from patients with fybrodisplasia ossificans progressiva

Bravenboer Nathalie , Micha Dimitra , van Essen Huib , Netelenbos Coen , Eekhoff Marelise , Pals Gerard

Fibrodysplasia ossificans progressiva (FOP) is a rare, extremely disabling genetic disorder characterized by progressive heterotopic ossification preceded by episodic inflammatory soft tissue swellings (flare ups) leading to early death. There is no proven effective treatment yet. We aimed to develop an in vitro system to investigate the working mechanism of flare ups induced ossification.Skin biopsies were obtained from four patients with FOP. ...

ba0004oc17 | (1) | ICCBH2015

Inhibition of TGFβ signalling delays ossification in patients with fibrodysplasia ossificans progressiva

Micha Dimitra , Voermans Elise , Huib van Essen , Drukker Jesse , Netelenbos Coen , Eekhoff Marelise , Bravenboer Nathalie

Fibrodysplasia ossificans progressiva (FOP) is a rare congenital disorder characterized by progressive heterotopic ossification. FOP patients only present great toe malformations at birth. However, as they grow older they develop soft tissue lumps as a result of flare-ups causing the irreversible replacement of skeletal muscle tissue with bone tissue leading to cumulative physical immobility. Classical FOP patients possess a mutation (c.617G>A; R206H) in the activin recept...

ba0005p197 | Cell biology: osteoclasts and bone resorption | ECTS2016

Effects of TGF-β inhibition on osteogenesis and osteoclastogenesis by periodontal ligament fibroblasts from patients with fibrodysplasia ossificans progressiva

de Vries Teun J. , Schoenmaker Ton , Micha Dimitra , Netelenbos Coen , Pals Gerard , Eekhoff Marelise W. , Bravenboer Nathalie

Background: Fibrodysplasia Ossificans Progressiva (FOP) is a progressive disease characterized by periods of heterotopic ossification, often in ligaments. The underlying mechanism is far from clear, partially due to limited access to patient-derived cell models. Periodontal ligament fibroblasts (PLF) from extracted teeth can potentially be used to study deviant bone remodelling processes in vitro since these cells are derived from actual ligaments. They further provid...

ba0003oc4.1 | Genetics of bone disease | ECTS2014

PLS3 mutations in X-linked osteoporosis with fractures

Zillikens M Carola , van Dijk Fleur S , Micha Dimitra , Riessland Markus , Marcelis Carlo LM , de-Die Smulders Christine E , Milbradt Janine , Franken Anton A , Harsevoort Arjan J , Lichtenbelt Klaske D , van de Peppel J , Pruijs Hans E , Rubio-Gozalbo M Estela , Zwertbroek Rolf , Moutaouakil Youssef , Egthuijsen Jaqueline , van der Eerden B , Hammerschmidt Matthias , Bijman Renate , Semeins Cor M , Bakker Astrid D , Everts Vincent , Klein-Nulend Jenneke , Campos-Obando Natalia , Hofman Albert , te Meerman Gerard J , van Leeuwen JP , Verkerk Annemieke JMH , Uitterlinden Andre G , Maugeri Alessandra , Sistermans Erik A , Waisfisz Quinten , Meijers-Heijboer Hanne , Wirth Brunhilde , Simon Marleen EH , Pals Gerard

Background: We identified a family with early onset X-linked osteoporosis and fracturesMethods: We performed whole exome sequencing of the X chromosome in three affected members. After discovering a putative pathogenic variant we performed Sanger sequencing of all exons of this gene in other members of this family and in 95 unrelated men suspected of OI type I without COL1A1/2 mutations. We also genotyped a SNP in this gene (minor allele frequency 0.02) ...