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Radioprotective effects of ultra-small citrate-stabilized cerium oxide nanoparticles in vitro and in vivo

机译:超小型柠檬酸盐稳定铈氧化物纳米粒子在体外和体内的辐射防护作用

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A comprehensive study of the radioprotective action mechanisms of ultra-small, citrate-stabilized, nanocrystalline cerium oxide (CeO _(2) nanoparticles, nanoceria) in vitro and in vivo was carried out. CeO _(2) nanoparticles were shown to significantly reduce the levels of hydrogen peroxide and hydroxyl radicals in aqueous solutions under X-ray irradiation. Pretreatment of primary mouse fibroblasts by CeO _(2) nanoparticles in a wide range of concentrations (10 ~(?5) to 10 ~(?9) M) protects cells from radiation-induced oxidative stress, maintaining a high level of dehydrogenase activity. A protective effect of CeO _(2) nanoparticles is also manifested in a decrease in the number of apoptotic cells and the level of reactive oxygen species (ROS) in a culture of primary mouse fibroblasts in vitro , as well as in a significant reduction (up to 50% of the control) of cytogenetic damage of mouse bone marrow in vivo . The intraperitoneal administration of CeO _(2) nanoparticles (200 nM) increased the rate of survival of mice exposed to X-ray radiation at a lethal dose, both in the prophylactic and the therapeutic schemes of administration, testifying the protection at the molecular, cellular and organism levels. The physical, chemical and biological origins of the protective action of CeO _(2) nanoparticles upon exposure of living systems to ionizing radiation in vitro and in vivo are discussed.
机译:进行了超小,柠檬酸盐稳定,纳米晶铈(CeO _(2)纳米颗粒,纳米粒子,纳米粒子)体外和体内CEO _(2)纳米颗粒,纳米粒子)的综合研究。显示CEO _(2)纳米颗粒在X射线照射下显着降低水溶液中过氧化氢和羟​​基自由基的水平。通过CeO _(2)纳米颗粒在宽范围浓度(10〜(α5)至10〜(β9)m)中预处理初级小鼠成纤维细胞保护细胞免受辐射诱导的氧化应激,保持高水平的脱氢酶活性。 CeO _(2)纳米颗粒的保护作用也表现出在体外诱导初级小鼠成纤维细胞培养中的凋亡细胞和反应性氧物种(ROS)的数量下降,以及显着减少(体内小鼠骨髓细胞遗传学损伤的40%左右。 CeO _(2)纳米颗粒(200nm)的腹膜内施用增加了暴露于致死剂量的小鼠的存活率,致死剂量在预防和治疗方案中,证明了分子的保护,细胞和生物水平。讨论了CEO _(2)纳米颗粒保护作用的物理,化学和生物学起源,以在体外和体内电离辐射的情况下。

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