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Evidence of peroxynitrite-mediated oxidative cell injury in the lateral geniculate nucleus in experimental glaucoma.

机译:实验性青光眼外侧膝状核中过氧亚硝酸盐介导的氧化细胞损伤的证据。

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摘要

Purpose. To determine whether (a) oxidative cellular injury mediated by peroxynitrite, a reaction product of nitric oxide (NO ·) and superoxide (O2·-) and (b) expression of NO· synthesizing enzymes, nitric oxide synthases (NOS)-I, II, or III, play a role in neuronal degeneration in the lateral geniculate nucleus (LGN) in glaucoma. Methods. LGN sections of monkeys with experimental glaucoma with survival periods between 1 to 14 months and of normal control monkeys were studied. Immunohistochemistry was used to detect nitrotyrosine, an oxidative protein modification mediated by peroxynitrite, and NOS-I, II, and III in the LGN. Results. Nitrotyrosine immunoreactivity was detected in profiles in the LGN parenchyma and blood vessel endothelium in LGN sections of all glaucoma monkeys, compared to rare immunoreactivity in control LGN sections. Of the three NOS isoforms examined, only NOS-III was upregulated in the LGN of glaucoma monkeys with a 14-month survival period. Conclusion. The presence of nitrotyrosine in the LGN in experimental glaucoma suggests that peroxynitrite mediated cell injury occurs in the LGN in glaucoma and may contribute to LGN degenerative changes.
机译:目的。为了确定(a)过氧化亚硝酸盐,一氧化氮(NO·)和超氧化物(O2·-)的反应产物介导的氧化性细胞损伤,以及(b)NO·合成酶一氧化氮合酶(NOS)-I的表达, II或III在青光眼的外侧膝状核(LGN)中的神经元变性中起作用。方法。研究了存活期在1到14个月之间的实验性青光眼猴子和正常对照猴子的LGN切片。免疫组织化学被用于检测硝基酪氨酸,硝基酪氨酸是由过氧亚硝酸盐以及LGN中的NOS-1,II和III介导的氧化蛋白修饰。结果。在所有青光眼猴子的LGN切片的LGN实质和血管内皮中,检测到硝基酪氨酸免疫反应,而在对照LGN切片中则检测到稀有的免疫反应。在检查的三种NOS亚型中,只有14个月生存期的青光眼猴子LGN中NOS-III上调。结论。 LGN在实验性青光眼中存在硝基酪氨酸表明,过氧亚硝酸盐介导的细胞损伤发生在青光眼的LGN中,可能有助于LGN的变性变化。

著录项

  • 作者

    Luthra, Anchla.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Ophthalmology.
  • 学位 M.Sc.
  • 年度 2002
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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