The role of parathyroid hormone-related protein in the regulation of osteoclastogenesis by cementoblasts

The role of parathyroid hormone-related protein in the regulation of osteoclastogenesis by cementoblasts

Autor Boabaid, Fernanda Autor UNIFESP Google Scholar
Berry, J. E. Google Scholar
Koh, A. J. Google Scholar
Somerman, M. J. Google Scholar
McCauley, L. K. Google Scholar
Instituição Univ Michigan
Universidade Federal de São Paulo (UNIFESP)
Univ Washington
Resumo Background: Parathyroid hormone-related protein (PTHrP) promotes osteoclastogenesis by inhibiting expression of osteoprotegerin (OPG), a decoy receptor for the receptor activator of nuclear factor kappa B (RANK), and by enhancing production of RANK ligand (RANKL) by osteoblasts. However, little is known regarding the role of PTHrP in regulating cementoblast-mediated osteoclastogenesis.Methods: This study determined the impact of PTHrP on osteoclastogenesis using: 1) OCCM-30 (immortalized murine cemento-blasts), 2) RAW 264.7 cells (murine myeloid cells), or 3) OCCM-30 plus RAW 264.7 cells. Cells were treated with PTHrP (1-34), RANKL, or PTHrP and RANKL combined. Enzyme-linked immuno-sorbent assays (ELISAs) for OPG and RANKL were performed on media and cell lysates, and tartrate-resistant acid phosphatase (TRAP) and mRNA detection for the osteoclast associated receptor (OSCAR) were performed.Results: the highest numbers of TRAP-positive cells and cells expressing OSCAR were found in the RAW cell group treated with either RANKL alone or RANKL and PTHrP. TRAP-positive cells were fewer when OCCM cells were co-cultured with RAW, but the greatest numbers were still with both PTHrP and RANKL. OPG levels were highest from OCCM cells and PTHrP decreased these levels. in contrast, RANKL levels were low in OCCM cell lysates and PTHrP increased RANKL. in vivo studies also revealed high osteoclastic activity surrounding developing teeth in mice administered PTH.Conclusions: These results demonstrate that PTHrP influences the balance of OPG and RANKL production by cementoblasts, and further indicate that this effect, in the context of surrounding cells, might have a significant impact on osteoclastogenesis, root resorption, and tooth eruption.
Assunto cementoblasts
ligand, NF-kappa B
proteins, parathyroid hormone related
receptor activator, NF-kappa B
tooth eruption
tooth root
Idioma Inglês
Data 2004-09-01
Publicado em Journal of Periodontology. Chicago: Amer Acad Periodontology, v. 75, n. 9, p. 1247-1254, 2004.
ISSN 0022-3492 (Sherpa/Romeo, fator de impacto)
Editor Amer Acad Periodontology
Extensão 1247-1254
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000224218500012

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