期刊
JOURNAL OF NEUROSCIENCE METHODS
卷 127, 期 1, 页码 11-17出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0165-0270(03)00097-9
关键词
histamine; excimer; fluorescence derivatization; brain; microdialysis
This paper describes a sensitive and selective liquid chromatographic method with fluorescence detection for determination of histamine in brain microdialysis samples from awake rats. Samples containing histamine (10 mul) were derivatized with 20 mul of the reagent consisting of 3 mM 4-(1-pyrene)butyric acid N-hydroxysuccinimide ester (PSE), 3 mM potassium carbonate and acetonitrile (1: 1: 18, v/v), thereafter 20 mul volume was injected onto the microbore column packed with C 18 silica gel. The histamine derivative contained two pyrene moieties, which generated intramolecular excimer fluorescence (450-540 nm) and allowed clear discrimination from the monomer fluorescence (360-420 mn) emitted by PSE itself. The separation of histamine-pyrene derivative was achieved within 25 min, the detection limit (S/N = 3) was 0.3 fmol histamine in 20 mul injected. The basal extracellular levels of histamine collected in 10-min fractions (fmol per 10 mul, mean +/- S.D., not corrected for recovery, n = 10 rats) were 35.45 +/- 4.56 (hypothalamus), 9.05 +/- 1.56 (prefrontal cortex), 7.83 +/- 0.86 (hippocampus) and 6.54 +/- 0.66 (striatum). The voltage-sensitive release of histamine was evaluated by perfusing the probes with high (100 mM) concentration of potassium ions or with sodium channel blocker tetrodotoxin (1 muM), and the calcium-dependent release was tested by perfusion with calcium-free Ringer solution. These data, together with physiologically induced increase of extracellular histamine in four examined brain regions during forced swimming demonstrate that this method is suitable for high-sensitive determination of neuronally released histamine under various pharmacological and physiological conditions. (C) 2003 Elsevier Science B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据