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FAC是枸櫞酸去鐵胺
To explore the effects of ferric ion on the differentiation from both RAW264.7 and bone marrow macrophages to osteoclast in vitro and bone resorption in vivo. In the presence of 50 ng/ml receptor activator of nuclear factor kappa-B ligand (RANKL), RAW264.7 was treated with ferric ammonium citrate (FAC). The formation of osteoclast was observed by staining of tartrate-resistant acid phosphatase (TRAP) and the TRAP positive cell counted. The expression levels of TRAP, cathepsin-K, nuclear factor of activated T cells c1 (NFATc1) and (receptor activator of NF-κB) RANK were measured by reverse transcription-polymerase chain reaction (RT-PCR).The control and iron overload groups were established by the intraperitoneal injection of normal saline and FAC. In vivo imaging system was employed to determine the bone density of femoral midportion and the fourth lumbar vertebra. After that, the bone marrow cells of femurs were used for osteoclast culture. The serum levels of ferritin, TRAP-5b, RANKL, osteoprotegerin (OPG) and C-terminal cross-linking opeptide (CTX) were measured by enzyme-linked immunosorbent assay (ELISA). Ferric ion could stimulate the formation of TRAP positive cells in a dose-dependent manner. The expression levels of TRAP, cathepsin-K and NFATc1 in the FAC treated group were significantly higher those of the control group (P < 0.05) while the expression of RANK showed no statistical difference among these groups (P = 0.967). The bone marrow density of femoral midportion and the fourth lumbar vertebra of the iron-overload group decreased significantly versus the control group. The concentrations of ferritin, TRAP-5b, RANKL and CTX of the iron overload group were markedly higher than those of the control group (P < 0.05). Moreover, the concentration of ferritin showed a positive correlation with TRAP-5b and CTX respectively in the iron-overload group (r = 0.65, r = 0.76, P < 0.05). But no significant differences existed in the concentration of OPG for two groups (P > 0.05). Ferric ion may enhance the differentiation of osteoclast in vitro as well as bone resorption in vivo.
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