A novel in vivo assay system for consecutive measurement of brain nitric oxide production combined with the microdialysis technique

Kouichi Ohta, Nobuo Araki, Mamoru Shibata, Junichi Hamada, Satoru Komatsumoto, Kunio Shimazu, Yasuo Fukuuchi

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A novel spectrophotometric nitrite (NO-2) nitrate (NO-3) assay system for a small quantity (5 μl) of dialysate sample obtained by in vivo brain microdialysis was developed based on the diazotization reaction. The system has the advantages of in vivo consecutive measurement, high precision, good reproducibility, technical simplicity, relatively short resolution time (2.5-20 min), and wide availability. The NO-3 level in the rat striatum was found to be 3 times higher than the NO-2 level. A nitric oxide (NO) synthase inhibitor, NG-nitro-l-arginine methyl ester, reduced striatal NO-2 citrulline formation in a dose-related manner and increased arginine, indicating that the tissue NO-2 level detected by this assay system adequately reflects the striatal NO synthase activity.

Original languageEnglish
Pages (from-to)165-168
Number of pages4
JournalNeuroscience Letters
Issue number2
Publication statusPublished - 1994 Aug 1



  • Arginine
  • Citrulline
  • In vivo microdialysis
  • N-Nitro-l-arginine methyl ester
  • Nitrate
  • Nitric oxide
  • Nitrite
  • Striatum

ASJC Scopus subject areas

  • Neuroscience(all)

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