title: Cyclic tensile stress during physiological occlusal force enhances osteogenic differentiation of human periodontal ligament cells via ERK1/2-Elk1 MAPK pathway.
abstract: Physiological occlusal force constitutively exists in the oral environment and is important for periodontal homeostasis and remodeling. Cyclic tensile stress (CTS) triggers the biological response of periodontal ligament (PDL). However, a few reports have studied the correlation between CTS during physiological occlusal force and PDL cell activities such as osteogenic differentiation. In the present study, human PDL cells (hPDLCs) were subjected to 10% elongation CTS loading at 0.5 Hz for 24 h, which represents the physiological conditions of occlusal force. Gene expression microarray was used to investigate the mechano-induced differential gene profile and pathway analysis in vitro. The osteogenic relative factors, that is, SPP1, RUNX2, and SP7, were assessed by real-time PCR and Western blot. The involvement of mitogen-activated protein kinase (MAPK) signaling pathways was investigated by Western blot with a specific inhibitor. The expressions of SPP1, RUNX2, SP7, p-ERK1/2, and p-Elk1 were up-regulated after 10% CTS exposure. However, these up-regulated expressions were prevented by ERK1/2 inhibitor U0126 in the physiological occlusal force-applied hPDLCs. These results showed that 10% CTS could enhance osteogenic differentiation of hPDLCs via ERK1/2-Elk1 MAPK pathway, indicating that CTS during physiological occlusal force is a potent agent for PDL remodeling.
authors.affiliation: Institute of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Li
authors.forename: Minxuan
authors.initials: M
authors.lastname: Han
authors.forename: Sheng
authors.initials: S
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
mesh_terms: D000293:Adolescent; D001732:Bite Force; D002070:Butadienes / Q000494:pharmacology; D002454:Cell Differentiation; D002478:Cells, Cultured; D002648:Child; D050659:Core Binding Factor Alpha 1 Subunit / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation; D006801:Humans; D020935:MAP Kinase Signaling System; D009570:Nitriles / Q000494:pharmacology; D020411:Oligonucleotide Array Sequence Analysis; D010012:Osteogenesis / Q000502:physiology*; D053495:Osteopontin / Q000235:genetics / Q000378:metabolism; D010513:Periodontal Ligament / Q000166:cytology* / Q000502:physiology; D000076182:Sp7 Transcription Factor; D013314:Stress, Mechanical; D013312:Stress, Physiological; D013718:Tensile Strength / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation; D055815:Young Adult
chemical_list: D002070:Butadienes; D050659:Core Binding Factor Alpha 1 Subunit; D009570:Nitriles; C493709:RUNX2 protein, human; C506895:SPP1 protein, human; D000076182:Sp7 Transcription Factor; C478163:SP7 protein, human; D014157:Transcription Factors; C113580:U 0126; D053495:Osteopontin