title: Minodronic acid influences receptor activator of nuclear factor kappaB ligand expression and suppresses bone resorption by osteoclasts in rats with collagen-induced arthritis.
abstract: We investigated the inhibitory mechanism of bone resorption by minodronic acid in collagen-induced arthritis (CIA) in rats. Four groups of female Sprague-Dawley rats, aged 7 months, were studied: three groups of collagen-sensitized rats, including one placebo-administered group (CIA-P), and two minodronic acid-administered groups at 0.2 mg/kg/2 day (CIA-BIS) and 2.0 mg/kg/2 day (CIA-BIS10). These were studied with an additional untreated observation group (Cont group). Minodronic acid was administered orally a day after the initial sensitization. The femoral posteromedial condyle was analyzed histologically and immunohistologically 4 weeks after the initial sensitization. Western blotting was also performed to assess the receptor activator of nuclear factor kappaB (RANK), RANK ligand (RANKL), and osteoprotegerin (OPG) expression of the knee joints. In CIA-P rats, many tartrate-resistant acid phosphatase (TRAP)-positive cells were found at the pannus-lining layer and the epiphyseal medulla. The bone-lining cells in the epiphyseal medulla and the cells in the pannus strongly expressed RANK and RANKL. In the minodronic acid-administered group, the number of TRAP-positive cells and the severity of arthritis were reduced. The reduction in the CIA-BIS10 group was significant compared with the CIA-P group (P < 0.05). Dosage-dependent reduction of RANK and RANKL expression was confirmed by immunohistology and Western blotting. With or without minodronic acid administration, no apoptotic cells were found in any groups using the TdT-mediated dUTP-biotinnick end labeling (TUNEL) method. The expression of OPG was not clear in all groups. These results demonstrated that minodronic acid inhibited the differentiation and the activation of osteoclasts not by inducing apoptosis but by inhibiting the RANKL-RANK system, and thereby suppressing bone resorption.
authors.affiliation: Division of Orthopedic Surgery, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan. shinji@sanmedia.or.jp
authors.forename: Shinji
authors.initials: S
authors.lastname: Tanishima
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kishimoto
authors.forename: Satoru
authors.initials: S
authors.lastname: Fukata
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Mizumura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hagino
authors.forename: Ryota
authors.initials: R
authors.lastname: Teshima
mesh_terms: D000818:Animals; D001169:Arthritis, Experimental / Q000188:drug therapy*; D050071:Bone Density Conservation Agents / Q000494:pharmacology*; D001862:Bone Resorption / Q000188:drug therapy*; D004164:Diphosphonates / Q000494:pharmacology*; D004195:Disease Models, Animal; D005260:Female; D007093:Imidazoles / Q000494:pharmacology*; D053244:Osteoprotegerin / Q000187:drug effects / Q000378:metabolism; D053245:RANK Ligand / Q000187:drug effects* / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D050071:Bone Density Conservation Agents; D004164:Diphosphonates; D007093:Imidazoles; D053244:Osteoprotegerin; D053245:RANK Ligand; C087958:YM 529