Adult mesenchymal stem cells, such as dental pulp stem cells, are of great interest for cellbased tissue engineering strategies because they can differentiate into a variety of tissuespecific cells, above all, into osteoblasts. In recent years, epigenetic studies on stem cells have indicated that specific histone alterations and modifying enzymes play essential roles in cell differentiation. However, although several studies have reported that valproic acid (VPA)-a selective inhibitor of histone deacetylases (HDAC)-enhances osteoblast differentiation, data on osteocalcin expression-a late-stage marker of differentiation-are limited. We therefore decided to study the effect of VPA on dental pulp stem cell differentiation. A low concentration of VPA did not reduce cell viability, proliferation, or cell cycle profile. However, it was sufficient to significantly enhance matrix mineralization by increasing osteopontin and bone sialoprotein expression. In contrast, osteocalcin levels were decreased, an effect induced at the transcriptional level, and were strongly correlated with inhibition of HDAC2. In fact, HDAC2 silencing with shRNA produced a similar effect to that of VPA treatment on the expression of osteoblastrelated markers. We conclude that VPA does not induce terminal differentiation of osteoblasts, but stimulates the generation of less mature cells. Moreover, specific suppression of an individual HDAC by RNA interference could enhance only a single aspect of osteoblast differentiation, and thus produce selective effects.
Histone deacetylase inhibition with valproic acid downregulates osteocalcin gene expression in human dental pulp stem cells and osteoblasts : evidence for HDAC2 involvement / F. Paino, A. La Noce, I. Tirino, A. Naddeo, V. Desiderio, U. Pirozzi, L. De Rosa, U. Laino, U. Altucci, G. Papaccio. - In: STEM CELLS. - ISSN 1066-5099. - 32:1(2014), pp. 279-289.
|Titolo:||Histone deacetylase inhibition with valproic acid downregulates osteocalcin gene expression in human dental pulp stem cells and osteoblasts : evidence for HDAC2 involvement|
|Parole Chiave:||DPSC; HDAC; Osteogenesis; Valproic acid; Apoptosis; Cell Cycle; Cell Differentiation; Dental Pulp; Down-Regulation; Histone Deacetylase 1; Histone Deacetylase 2; Histone Deacetylase Inhibitors; Humans; Mesenchymal Stromal Cells; Osteoblasts; Osteocalcin; Osteopontin; Transfection; Valproic Acid; Molecular Medicine; Developmental Biology; Cell Biology|
|Settore Scientifico Disciplinare:||Settore BIO/17 - Istologia|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/stem.1544|
|Appare nelle tipologie:||01 - Articolo su periodico|