title: Effect of estrogen on bone resorption and inflammation in the temporomandibular joint cellular elements.
abstract: Several epidemiological studies have reported that temporomandibular disorder is more prevalent in women, which suggests the involvement of sex hormones, such as estrogen, in the pathogenesis of this disease. PCR amplification and Western blotting were employed to target the expression of estrogen receptors (ERs) in human fibroblast-like synovial and ATDC5 cells. The effect of estrogen was investigated through the expression of RANKL, osteoprotegerin (OPG), M-CSF/CSF-1 and c-fms. We showed expression of M-CSF/ CSF-1 and c-fms, with time-dependent increase in both after the addition of estrogen. Based on previous studies reporting that M-CSF/CSF-1 regulates the proliferation and differentiation of hemopoietic progenitor cells into mature macrophages, we put forward a new hypothesis based on the increased inflammation and tendency of females to suffer more from temporomandibular disorder (TMD) in the presence of external exacerbating factors. Detection of RANKL and OPG in ATDC5 and expression of both in HFLS was confirmed with complete disappearance of the RANKL band, and marked increase in the expression of OPG after 1 h from the addition of estrogen.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hokkaido University Graduate School of Dental Medicine, Hokkaido, Japan.
authors.forename: Nadia
authors.initials: N
authors.lastname: Galal
authors.forename: Waleed
authors.initials: W
authors.lastname: El Beialy
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Deyama
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Yoshimura
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Suzuki
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Totsuka
mesh_terms: D000368:Aged; D000818:Animals; D015153:Blotting, Western; D001862:Bone Resorption / Q000235:genetics / Q000378:metabolism / Q000517:prevention & control; D002454:Cell Differentiation / Q000187:drug effects; D045744:Cell Line, Tumor; D002478:Cells, Cultured; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects; D012739:Gonadal Steroid Hormones / Q000494:pharmacology; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000378:metabolism / Q000517:prevention & control; D016173:Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism; D053244:Osteoprotegerin / Q000235:genetics / Q000378:metabolism; D053245:RANK Ligand / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D053246:Receptor Activator of Nuclear Factor-kappa B / Q000032:analysis / Q000187:drug effects / Q000235:genetics; D016186:Receptor, Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism; D011960:Receptors, Estrogen / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013583:Synovial Membrane / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D013704:Temporomandibular Joint / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000235:genetics / Q000378:metabolism / Q000517:prevention & control
chemical_list: D004967:Estrogens; D012739:Gonadal Steroid Hormones; D053244:Osteoprotegerin; D053245:RANK Ligand; D012333:RNA, Messenger; D053246:Receptor Activator of Nuclear Factor-kappa B; D011960:Receptors, Estrogen; D016173:Macrophage Colony-Stimulating Factor; D016186:Receptor, Macrophage Colony-Stimulating Factor