{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T15:03:48Z","timestamp":1791644628764,"version":"4.3.4"},"reference-count":0,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2004,9,1]],"date-time":"2004-09-01T00:00:00Z","timestamp":1093996800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Periodontology"],"published-print":{"date-parts":[[2004,9]]},"abstract":"<jats:p><jats:bold>Background:<\/jats:bold> Parathyroid hormone\u2010related 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\u2010mediated osteoclastogenesis.<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold> This study determined the impact of PTHrP on osteoclastogenesis using: 1) OCCM\u201030 (immortalized murine cementoblasts), 2) RAW 264.7 cells (murine myeloid cells), or 3) OCCM\u201030 plus RAW 264.7 cells. Cells were treated with PTHrP (1\u201034), RANKL, or PTHrP and RANKL combined. Enzyme\u2010linked immunosorbent assays (ELISAs) for OPG and RANKL were performed on media and cell lysates, and tartrate\u2010resistant acid phosphatase (TRAP) and mRNA detection for the osteoclast associated receptor (OSCAR) were performed.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> The highest numbers of TRAP\u2010positive cells and cells expressing OSCAR were found in the RAW cell group treated with either RANKL alone or RANKL and PTHrP. TRAP\u2010positive cells were fewer when OCCM cells were co\u2010cultured 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.<\/jats:p><jats:p><jats:bold>Conclusions:<\/jats:bold> 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. <jats:italic>J Periodontol 2004;75:1247\u20101254<\/jats:italic>.<\/jats:p>","DOI":"10.1902\/jop.2004.75.9.1247","type":"journal-article","created":{"date-parts":[[2005,2,2]],"date-time":"2005-02-02T07:58:45Z","timestamp":1107331125000},"page":"1247-1254","source":"Crossref","is-referenced-by-count":82,"title":["The Role of Parathyroid Hormone\u2010Related Protein in the Regulation of Osteoclastogenesis by Cementoblasts"],"prefix":"10.1002","volume":"75","author":[{"given":"Fernanda","family":"Boabaid","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janice E.","family":"Berry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amy J.","family":"Koh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martha J.","family":"Somerman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laurie K.","family":"McCauley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2004,9]]},"container-title":["Journal of Periodontology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/aap.onlinelibrary.wiley.com\/doi\/pdf\/10.1902\/jop.2004.75.9.1247","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,19]],"date-time":"2025-10-19T14:40:02Z","timestamp":1760884802000},"score":1,"resource":{"primary":{"URL":"https:\/\/aap.onlinelibrary.wiley.com\/doi\/10.1902\/jop.2004.75.9.1247"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2004,9]]},"references-count":0,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2004,9]]}},"alternative-id":["10.1902\/jop.2004.75.9.1247"],"URL":"https:\/\/doi.org\/10.1902\/jop.2004.75.9.1247","archive":["Portico"],"relation":{},"ISSN":["0022-3492","1943-3670"],"issn-type":[{"value":"0022-3492","type":"print"},{"value":"1943-3670","type":"electronic"}],"subject":[],"published":{"date-parts":[[2004,9]]}}}