A novel inhibitory mechanism of nitrogen-containing bisphosphonate on the activity of Cl- extrusion in osteoclasts
| Autor: | Fujio Okamoto, Koji Okabe, Yoshiyuki Nagaoka, Atsushi Nagai, Kimiko Ohgi, Hiroshi Kajiya, Tokuya Onitsuka, Ryuji Sakagami |
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| Rok vydání: | 2012 |
| Předmět: |
Male
Geranylgeranyl Transferase Nitrogen medicine.medical_treatment Osteoclasts Bone Marrow Cells Mevalonic acid Bone resorption Cell Line chemistry.chemical_compound Mice Chlorides medicine Animals Gene Silencing RNA Small Interfering Cells Cultured Pharmacology chemistry.chemical_classification Alkyl and Aryl Transferases Diphosphonates Geranyltranstransferase General Medicine Metabolism Bisphosphonate Etidronic acid Cell biology Enzyme Zoledronic acid chemistry Biochemistry Diterpenes medicine.drug |
| Zdroj: | Naunyn-Schmiedeberg's archives of pharmacology. 386(7) |
| ISSN: | 1432-1912 |
| Popis: | Nitrogen-containing bisphosphonates have been well known to be inhibited farnesyl diphosphate synthase (FDPS), an enzyme in mevalonic acid metabolism, resulting in disturbance in polymerization of cytoskeleton structure in bone resorption and promotion of apoptosis in mature osteoclasts. Although bisphosphonates have been reported to activate ion transporters in native epithelium and Xenopus oocytes, little is known whether bisphosphonates affect acid hydrochronic acid extrusion in osteoclasts during bone resorption. The aim of this study was to determine the role of bisphosphonates on inhibition of hydrochronic acid extrusion in osteoclasts. Effects of zoledronic acid, a nitrogen-containing bisphosphonate, on the Cl(-) current activated by extracellular acidification were examined in two types of osteoclasts derived from RAW264.7 cells and mouse bone marrow macrophages (BMMs). Extracellular acidification induced outwardly rectifying Cl(-) currents in mouse osteoclasts. Zoledronic acid dose-dependently inhibited the acid-activated Cl(-) current. The non-nitrogen bisphosphonate etidronic acid had no effect on the acid-activated Cl(-) current. Tetracycline-induced FDPS silencing caused a significant decrease in the Cl(-) current. The inhibitor of geranylgeranyl transferase suppressed the Cl(-) current. By contrast, the inhibitory action of zoledronic acid was rescued by addition of geranylgeranyl acid, a derivative of mevalonic acid. The activity of acid-activated Cl(-) currents was dependent on expression of ClC-7 during osteoclastogenesis. These results suggest that nitrogen-containing bisphosphonates suppress the activity of osteoclastic acid-activated Cl(-) currents through FDPS inhibition, suggesting the inhibition of Cl(-) extrusion activity. |
| Databáze: | OpenAIRE |
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