title: Brain-derived neurotrophic factor stimulates bone/cementum-related protein gene expression in cementoblasts.
abstract: Brain-derived neurotrophic factor (BDNF), recognized as essential in the developing nervous system, is involved in differentiation and proliferation in non-neuronal cells, such as endothelial cells, osteoblasts, and periodontal ligament cells. We have focused on the application of BDNF to the regeneration of periodontal tissue and indicated that BDNF promotes the regeneration of experimentally created periodontal defects. Cementoblasts form cementum, mineralized tissue, which is key to establishing a functional periodontium. The application of BDNF to the regeneration of periodontal tissue requires elucidation of the mechanism by which BDNF regulates the functions of cementoblasts. In this study, we examined how BDNF regulates the mRNA expression of bone/cementum-related proteins (alkaline phosphatase (ALP), osteopontin (OPN), and bone morphogenetic protein-2 (BMP-2)) in cultures of immortalized human cementoblast-like (HCEM) cells. BDNF elevated the mRNA levels of ALP, OPN, and BMP-2 in HCEM cells. Small interfering RNA (siRNA) for TRKB, a high affinity receptor of BDNF, siRNA for ELK-1, which is a downstream target of ERK1/2, and PD98059, an ERK inhibitor, obviated the increase in the mRNA levels. BDNF increased the levels of phosphorylated ERK1/2 and Elk-1, and the blocking of BDNF signaling by treatment with siRNA for TRKB and PD98059 suppressed the phosphorylation of ERK1/2 and Elk-1. Furthermore, BDNF increased the levels of phosphorylated c-Raf, which activates the ERK signaling pathway. These findings provide the first evidence that the TrkB-c-Raf-ERK1/2-Elk-1 signaling pathway is required for the BDNF-induced mRNA expression of ALP, OPN, and BMP-2 in HCEM cells.
authors.affiliation: Department of Periodontal Medicine, Hiroshima University Graduate School of Biomedical Sciences, Minami-ku, Hiroshima 34-8553, Japan.
authors.forename: Mikihito
authors.initials: M
authors.lastname: Kajiya
authors.forename: Hideki
authors.initials: H
authors.lastname: Shiba
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Fujita
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Ouhara
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Takeda
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Mizuno
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kawaguchi
authors.forename: Masae
authors.initials: M
authors.lastname: Kitagawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Takata
authors.forename: Koichiro
authors.initials: K
authors.lastname: Tsuji
authors.forename: Hidemi
authors.initials: H
authors.lastname: Kurihara
mesh_terms: D001842:Bone and Bones / Q000166:cytology / Q000378:metabolism; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D002461:Cell Line, Transformed; D049109:Cell Proliferation / Q000187:drug effects; D003739:Dental Cementum / Q000166:cytology / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D009420:Nervous System / Q000196:embryology; D009928:Organ Specificity / Q000187:drug effects / Q000502:physiology; D010513:Periodontal Ligament / Q000166:cytology / Q000502:physiology*; D012333:RNA, Messenger / Q000096:biosynthesis; D012038:Regeneration / Q000187:drug effects* / Q000502:physiology
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D012333:RNA, Messenger