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The expression of plasma nucleosomes in mice undergoing in vivo apoptosis.

机译:血浆核小体在经历体内细胞凋亡的小鼠中的表达。

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Nucleosomes occur in the blood of patients with systemic lupus erythematosus and are thought to result from in vivo cell death. To determine the conditions for the release of nucleosomes into the blood, normal mice were treated with four agents that have the potential to induce apoptosis or immune cell activation in vivo: LPS, CpG DNA, anti-Fas antibody, and dexamethasone. Blood nucleosomes were measured by a capture ELISA immunoassay, with the DNA component assessed by fluorimetry with the dye PicoGreen. Following treatment with LPS and a monoclonal anti-Fas antibody, nucleosomes and DNA appeared in the plasma in a dose-dependent fashion. In contrast, dexamethasone treatment, despite causing significant thymocyte loss, did not elicit plasma nucleosomes. Similarly, CpG DNA, while inducing an IL-12 response comparable to that of LPS, also did not elicit plasma nucleosomes. These results suggest that plasma nucleosome levels reflect specific patterns of cell death and are not an invariable consequence ofin vivo apoptosis or immune cell activation.
机译:核小体出现在系统性红斑狼疮患者的血液中,被认为是体内细胞死亡的结果。为了确定将核小体释放到血液中的条件,用四种可能在体内诱导凋亡或免疫细胞活化的药物处理了正常小鼠:LPS,CpG DNA,抗Fas抗体和地塞米松。血液核小体通过捕获ELISA免疫测定进行测量,DNA成分通过荧光染料PicoGreen进行评估。用LPS和单克隆抗Fas抗体治疗后,核小体和DNA以剂量依赖性方式出现在血浆中。相反,地塞米松治疗尽管引起明显的胸腺细胞损失,却未引起血浆核小体。类似地,CpG DNA在诱导与LPS相当的IL-12反应的同时,也未引起血浆核小体。这些结果表明血浆核小体水平反映了细胞死亡的特定模式,并不是体内细胞凋亡或免疫细胞活化的必然结果。

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