title: Different roles of dexamethasone on transforming growth factor-beta1-induced fibronectin and nerve growth factor expression in dental pulp cells.
abstract: During pulp injury, it has been hypothesized that transforming growth factor-beta1 (TGF-beta1) is released from dentin into pulp tissue and promotes pulp tissue healing. Dexamethasone is a glucocorticoid that has been used to treat pulp injury and shown to induce differentiation of hard tissue forming cells. However, the interaction between dexamethasone and TGF-beta1 is still unknown. This study aimed to examine the effects of dexamethasone on human pulp cells in the presence of TGF-beta1. TGF-beta1 increased expression and synthesis of both fibronectin and nerve growth factor (NGF), whereas dexamethasone stimulated fibronectin synthesis but inhibited NGF expression. The application of both TGF-beta1 and dexamethasone resulted in an additional effect on fibronectin; however, dexamethasone inhibited the TGF-beta1-induced NGF expression. Dexamethasone promotes fibronectin synthesis and suppresses NGF secretion, suggesting that this reagent could be used clinically to reduce pain and promote dental pulp tissue healing.
authors.affiliation: Department of Operative Dentistry, Chulalongkorn University, Henri Dunant Road, Bangkok, Thailand 10330. dupn1048@truemail.co.th
authors.forename: Sirivimol
authors.initials: S
authors.lastname: Srisawasdi
authors.forename: Prasit
authors.initials: P
authors.lastname: Pavasant
mesh_terms: D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D003782:Dental Pulp / Q000166:cytology / Q000187:drug effects*; D003907:Dexamethasone / Q000494:pharmacology*; D005353:Fibronectins / Q000187:drug effects*; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism; D060588:LIM Domain Proteins; D020932:Nerve Growth Factor / Q000187:drug effects*
chemical_list: D000893:Anti-Inflammatory Agents; D005353:Fibronectins; D047908:Intracellular Signaling Peptides and Proteins; D060588:LIM Domain Proteins; C490351:TGFB1I1 protein, human; D003907:Dexamethasone; D020932:Nerve Growth Factor