title: Osteoclastogenic potential of peripheral blood mononuclear cells in cleidocranial dysplasia.
abstract: Cleidocranial dysplasia (CCD) is an autosomal dominant skeletal dysplasia characterized by hypoplastic or aplastic clavicles, dental abnormalities, and delayed closure of the cranial sutures. In addition, mid-face hypoplasia, short stature, skeletal anomalies and osteoporosis are common. We aimed to evaluate osteoclastogenesis in a child (4 years old), who presented with clinical signs of CCD and who have been diagnosed as affected by deletion of RUNX2, master gene in osteoblast differentiation, but also affecting T cell development and indirectly osteoclastogenesis. The results of this study may help to understand whether in this disease is present an alteration in the bone-resorptive cells, the osteoclasts (OCs). Unfractionated and T cell-depleted Peripheral Blood Mononuclear Cells (PBMCs) from patient were cultured in presence/absence of recombinant human M-CSF and RANKL. At the end of the culture period, OCs only developed following the addition of M-CSF and RANKL. Moreover, real-time PCR experiment showed that freshly isolated T cells expressed the osteoclastogenic cytokines (RANKL and TNFα) at very low level, as in controls. This is in accordance with results arising from flow cytometry experiments demonstrating an high percentage of circulating CD4(+)CD28(+) and CD4(+)CD27(+) T cells, not able to produce osteoclastogenic cytokines. Also RANKL, OPG and CTX serum levels in CCD patient are similar to controls, whereas QUS measurements showed an osteoporotic status (BTT-Z score -3.09) in the patient. In conclusions, our findings suggest that the heterozygous deletion of RUNX2 in this CCD patient did not alter the osteoclastogenic potential of PBMCs in vitro.
authors.affiliation: 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy;
authors.forename: Maria Felicia
authors.initials: MF
authors.lastname: Faienza
authors.affiliation: 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy;
authors.forename: Annamaria
authors.initials: A
authors.lastname: Ventura
authors.affiliation: 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy;
authors.forename: Laura
authors.initials: L
authors.lastname: Piacente
authors.affiliation: 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy;
authors.forename: Maria
authors.initials: M
authors.lastname: Ciccarelli
authors.affiliation: 2. Nephrology, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy;
authors.forename: Margherita
authors.initials: M
authors.lastname: Gigante
authors.affiliation: 2. Nephrology, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy;
authors.forename: Loreto
authors.initials: L
authors.lastname: Gesualdo
authors.affiliation: 3. Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Bari, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Colucci
authors.affiliation: 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy;
authors.forename: Luciano
authors.initials: L
authors.lastname: Cavallo
authors.affiliation: 3. Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Bari, Italy.
authors.forename: Maria
authors.initials: M
authors.lastname: Grano
authors.affiliation: 3. Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Bari, Italy.
authors.forename: Giacomina
authors.initials: G
authors.lastname: Brunetti
mesh_terms: D018106:CD28 Antigens / Q000378:metabolism; D015704:CD4 Antigens / Q000378:metabolism; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology; D002675:Child, Preschool; D002973:Cleidocranial Dysplasia / Q000473:pathology*; D050659:Core Binding Factor Alpha 1 Subunit / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology* / Q000378:metabolism*; D008297:Male; D010010:Osteoclasts / Q000166:cytology / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000378:metabolism
chemical_list: D018106:CD28 Antigens; D015704:CD4 Antigens; D050659:Core Binding Factor Alpha 1 Subunit; C493709:RUNX2 protein, human; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7
keywords: Cleidocranial dysplasia; RUNX2; osteoclastogenesis