Immunocytochemical localization of GTP cyclohydrolase I in the brain, adrenal gland, and liver of mice

被引：56

作者：

Nagatsu, I ^{[1
]}

Ichinose, H ^{[1
]}

Sakai, M ^{[1
]}

Titani, K ^{[1
]}

Suzuki, M ^{[1
]}

Nagatsu, T ^{[1
]}

机构：

[1] FUJITA HLTH UNIV,SCH MED,INST COMPREHENS MED SCI,TOYOAKE,AICHI 47011,JAPAN

来源：

JOURNAL OF NEURAL TRANSMISSION-GENERAL SECTION | 1995年 / 102卷 / 03期

关键词：

GTP cyclohydrolase I; tyrosine hydroxylase; tryptophan hydroxylase; phenylalanine hydroxylase; tetrahydrobiopterin; liver; adrenal medulla; brain; mouse; immunocytochemistry;

D O I：

10.1007/BF01281153

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

GTP cyclohydrolase I (GCH) is the first and rate-limiting enzyme for the biosynthesis of tetrahydrobiopterin (BH4), the cofactor of phenylalanine, tyrosine, and tryptophan hydroxylases, the enzymes that synthesize tyrosine, catecholamines (dopamine, noradrenaline, and adrenaline), and serotonin, respectively. We produced for the first time polyclonal antibody with highly sensitive immunoreactivity against an oligopeptide of rat enzyme, GFPERELPRPGA, by immunization of rabbits with the peptide conjugated to hemocyanin by glutaraldehyde. The specificity of the antibody was confirmed by Western blot analysis. Using this antibody specific for GCH, we observed strong GCH immunostaining in the liver cells, in the dopamine-, noradrenaline-, adrenaline-, or serotonin-containing cells of the brain, and in the adrenal gland of mice. Immunocytochemical studies revealed GCH to be localized in monoamine-containing perikarya in the periglomerular cells of the olfactory bulb, zona incerta, arcuate nucleus, ventral tegmental area, substantia nigra pars compacta, locus ceruleus, nucleus tractus solitarius, area postrema, and ventrolateral area of the medulla oblongata. GCH immunostaining was particularly strong in serotoninergic nuclei, such as dorsal and median raphe nuclei, nucleus raphe pallidus, and nucleus raphe magnus. By immunoelectron micoscopy, GCH-labeled cytoplasm and microtubules in the processes were observed ultrastructurally, but no staining was found in the mitochondria, and Golgi apparatus. Immunostaining was observed neither in the group D neurons that contain only aromatic amino acid decarboxylase without tyrosine hydroxylase, nor in glial cells and endothelial cells. These results indicate the abundant presence of GCH in catecholaminergic and serotoninergic neurons as well as in the adrenal medulla and liver, where BH, is synthesized as the cofactor of tyrosine, tryptophan, and phenylalanine hydroxylases.

引用

页码：175 / 188

页数：14

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