Palatal fibroblasts reduce osteoclastogenesis in murine bone marrow cultures.

Voisin, Victoria; Caballé Serrano, Jordi; Sculean, Anton; Gruber, Reinhard (2016). Palatal fibroblasts reduce osteoclastogenesis in murine bone marrow cultures. BMC Oral Health, 16, p. 34. BioMed Central 10.1186/s12903-016-0195-y

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BACKGROUND Preclinical studies support the assumption that connective tissue grafts preserve the alveolar bone from resorption; the underlying cellular mechanisms, however, remain unknown. The cellular mechanisms may be attributed to the paracrine activity of the palatal fibroblasts. It was thus reasonable to suggest that palatal connective tissue grafts reduce the formation of osteoclasts. METHODS To test this hypothesis, human palatal fibroblasts were examined for their capacity to modulate the formation of osteoclasts in murine bone marrow cultures exposed to RANKL, M-CSF and TGF-β1. Osteoclastogenesis was determined by tartrate-resistant acid phosphatase (TRAP) staining and gene expression analysis. The formation of antigen presenting cells was based on the expression of CD14 and costimmulatory molecules of antigen presenting cells. The paracrine interaction of fibroblasts and the bone marrow was modeled in vitro with inserts of cell-occlusive membranes. RESULTS In cocultures without cell-to-cell contact, palatal fibroblasts caused a decrease in the expression of the osteoclast marker genes in bone marrow cells; calcitonin receptors, cathepsin K, TRAP, and osteoclast-associated receptor. Also the number of TRAP positive multinucleated cells was decreased in the presence of fibroblasts. Notably, palatal fibroblasts increased the expression of CD14 and the co-stimulatory proteins CD40, CD80, and CD86 in bone marrow cells. Bone marrow cells had no considerable impact on fibroblast viability and proliferation marker genes. With regard to cell distribution, osteoclasts were most prominent in the center of the membranes, while fibroblasts accumulated immediately adjacent to the border of the insert forming a ring-like structure on the surface of the culture plate. CONCLUSION The data suggest that palatal fibroblasts provide a paracrine environment that reduces osteoclastogenesis and increases markers of antigen presenting cells. Morover, the paracrine model revealed a joint activity between palatal fibroblasts and bone marrow cells visualized by the characteristic cell distribution in the two separated compartments.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > School of Dental Medicine, Restorative Dentistry, Research
04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry
04 Faculty of Medicine > School of Dental Medicine > School of Dental Medicine, Periodontics Research
04 Faculty of Medicine > School of Dental Medicine > Department of Periodontology
04 Faculty of Medicine > School of Dental Medicine
04 Faculty of Medicine > School of Dental Medicine > School of Dental Medicine, Research
04 Faculty of Medicine > School of Dental Medicine > Department of Oral Surgery and Stomatology

UniBE Contributor:

Voisin, Victoria; Caballé Serrano, Jordi; Sculean, Anton and Gruber, Reinhard

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1472-6831

Publisher:

BioMed Central

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

03 May 2017 15:56

Last Modified:

07 May 2017 02:24

Publisher DOI:

10.1186/s12903-016-0195-y

PubMed ID:

26984386

Uncontrolled Keywords:

Co-culture; Inserts; Macrophages; Murine bone marrow cultures; Osteoclast; Palatal fibroblasts

BORIS DOI:

10.7892/boris.94812

URI:

https://boris.unibe.ch/id/eprint/94812

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