RRC ID 44670
Author Nakao J, Fujii Y, Kusuyama J, Bandow K, Kakimoto K, Ohnishi T, Matsuguchi T.
Title Low-intensity pulsed ultrasound (LIPUS) inhibits LPS-induced inflammatory responses of osteoblasts through TLR4-MyD88 dissociation.
Journal Bone
Abstract Previous reports have shown that osteoblasts are mechano-sensitive. Low-intensity pulsed ultrasound (LIPUS) induces osteoblast differentiation and is an established therapy for bone fracture. Here we have examined how LIPUS affects inflammatory responses of osteoblasts to LPS. LPS rapidly induced mRNA expression of several chemokines including CCL2, CXCL1, and CXCL10 in both mouse osteoblast cell line and calvaria-derived osteoblasts. Simultaneous treatment by LIPUS significantly inhibited mRNA induction of CXCL1 and CXCL10 by LPS. LPS-induced phosphorylation of ERKs, p38 kinases, MEK1/2, MKK3/6, IKKs, TBK1, and Akt was decreased in LIPUS-treated osteoblasts. Furthermore, LIPUS inhibited the transcriptional activation of NF-κB responsive element and Interferon-sensitive response element (ISRE) by LPS. In a transient transfection experiment, LIPUS significantly inhibited TLR4-MyD88 complex formation. Thus LIPUS exerts anti-inflammatory effects on LPS-stimulated osteoblasts by inhibiting TLR4 signal transduction.
Volume 58
Pages 17-25
Published 2014-1
DOI 10.1016/j.bone.2013.09.018
PII S8756-3282(13)00372-4
PMID 24091132
MeSH Animals Cell Line Cell Membrane / metabolism Chemokines / genetics Chemokines / metabolism Gene Expression Profiling Inflammation / genetics Inflammation / pathology* Inflammation / therapy Lipopolysaccharides Lymphocyte Antigen 96 / metabolism Mice Mice, Inbred C57BL Models, Biological Myeloid Differentiation Factor 88 / metabolism* NF-kappa B / metabolism Osteoblasts / metabolism* Osteoblasts / pathology* RANK Ligand / genetics RANK Ligand / metabolism RNA, Messenger / genetics RNA, Messenger / metabolism Signal Transduction / genetics Toll-Like Receptor 4 / metabolism* Transcriptional Activation / genetics Ultrasonic Therapy Ultrasonics*
IF 4.36
Times Cited 10
Human and Animal Cells