{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T06:30:53Z","timestamp":1791095453527,"version":"4.1.0"},"reference-count":54,"publisher":"Oxford University Press (OUP)","issue":"12","license":[{"start":{"date-parts":[[2005,12,1]],"date-time":"2005-12-01T00:00:00Z","timestamp":1133395200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2005,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>HDIs are potential therapeutic agents for cancer and neurological diseases because of their abilities to alter gene expression, induce growth arrest or apoptosis of tumors cells, and stimulate differentiation. In this report, we show that several HDIs promote osteoblast maturation in vitro and in calvarial organ cultures.<\/jats:p>\n               <jats:p>Introduction: Histone deacetylase inhibitors (HDIs) are currently in phase I and II clinical trials as anticancer agents. Some HDIs are also commonly prescribed treatments for epilepsy and bipolar disorders. Although administered systemically, the effects of HDIs on osteoblasts and bone formation have not been extensively examined. In this study, we investigated the effect of histone deacetylase inhibition on osteoblast proliferation and differentiation.<\/jats:p>\n               <jats:p>Materials and Methods: MC3T3-E1 cells, calvarial-derived primary osteoblasts, and calvarial organ cultures were treated with various commercially available HDIs (trichostatin A [TSA], sodium butyrate [NaB], valproic acid [VPA], or MS-275). The effects of these inhibitors on cell proliferation, viability, cell cycle progression, Runx2 transcriptional activity, alkaline phosphatase production, and matrix mineralization were determined. Expression levels of osteoblast maturation genes, type I collagen, osteopontin, bone sialoprotein, and osteocalcin in response to TSA were measured by quantitative PCR.<\/jats:p>\n               <jats:p>Results: Concentrations of HDIs that caused hyperacetylation of histone H3 induced transient increases in osteoblast proliferation and viability but did not alter cell cycle profiles. These concentrations of HDIs also increased the transcriptional activity of Runx2. TSA accelerated alkaline phosphatase production in MC3T3-E1 cells and calvarial organ cultures. In addition, TSA accelerated matrix mineralization and the expression of osteoblast genes, type I collagen, osteopontin, bone sialoprotein, and osteocalcin in MC3T3-E1 cells.<\/jats:p>\n               <jats:p>Conclusions: These studies show that histone deacetylase activity regulates osteoblast differentiation and bone formation at least in part by enhancing Runx2-dependent transcriptional activation. Therefore, HDIs are a potentially new class of bone anabolic agents that may be useful in the treatment of diseases that are associated with bone loss such as osteoporosis and cancer.<\/jats:p>","DOI":"10.1359\/jbmr.050813","type":"journal-article","created":{"date-parts":[[2006,4,27]],"date-time":"2006-04-27T00:51:42Z","timestamp":1146099102000},"page":"2254-2263","source":"Crossref","is-referenced-by-count":218,"title":["Histone Deacetylase Inhibitors Promote Osteoblast Maturation"],"prefix":"10.1093","volume":"20","author":[{"given":"Tania M","family":"Schroeder","sequence":"first","affiliation":[{"name":"Graduate Program in Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer J","family":"Westendorf","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota, USA"},{"name":"The Cancer 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