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• W2912082503 abstract "Arsenic exposure increases the risk of various bone disorders. For instance, chronic exposure to low level arsenic can cause bone resorption by promoting osteoclast differentiation. Osteoclast precursor cells produce hydrogen peroxide after low level arsenic exposure and then undergo differentiation, producing cells which break down bone matrix. Nuclear factor E2-related factor 2 (Nrf2) regulates receptor activator of nuclear factor-κB dependent osteoclastogenesis by modulating intracellular reactive oxygen species (ROS) signaling via expression of cytoprotective enzymes. Here we tested the hypothesis that loss of Nrf2 will increase arsenic-induced bone loss. We treated 40 week-old Nrf2+/+ and Nrf2-/- mice with 5 ppm arsenic in the drinking water, which produces a blood arsenic level similar to humans living in areas where arsenic exposure is endemic. After 4 months, Micro-CT and dual-energy x-ray analysis revealed a drastic overall decrease in the bone volume with arsenic treatment in mice lacking Nrf2. Deficiency of Nrf2 in RAW 264.7 cells or bone marrow-derived macrophages (BMMs) promoted arsenic-induced osteoclast differentiation. Lack of Nrf2 increases arsenic-induced ROS levels and phosphorylation of p38. N-Acetyl-cysteine and SB203580 pretreatment essentially abolished arsenic-induced phosphorylation of p38 and reversed arsenic-induced increased osteoclast differentiation in Nrf2 deficiency. Taken together, our data suggest that loss of Nrf2 causes increased oxidative stress and enhanced susceptibility to arsenic-induced bone loss." @default.
• W2912082503 created "2019-02-21" @default.
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• W2912082503 date "2019-03-01" @default.
• W2912082503 modified "2023-10-17" @default.
• W2912082503 title "Nrf2 deficiency aggravates the increase in osteoclastogenesis and bone loss induced by inorganic arsenic" @default.
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• W2912082503 doi "https://doi.org/10.1016/j.taap.2019.02.003" @default.
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