Chiho Sumi-Ichinose

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Transcription factors involved in the specification and differentiation of neurons often continue to be expressed in the adult brain, but remarkably little is known about their late functions. Nurr1, one such transcription factor, is essential for early differentiation of midbrain dopamine (mDA) neurons but continues to be expressed into adulthood. In(More)
The yeast and animal SNF-SWI and related multiprotein complexes are thought to play an important role in processes, such as transcription factor binding to regulatory elements, which require nucleosome remodeling in order to relieve the repressing effect of packaging DNA in chromatin. There are two mammalian homologs of the yeast SNF2-SWI2 subunit protein,(More)
(6R)-L-erythro-5,6,7,8-Tetrahydrobiopterin (BH4) is an essential cofactor for tyrosine hydroxylase (TH), tryptophan hydroxylase, phenylalanine hydroxylase, and nitric-oxide synthase. These enzymes synthesize neurotransmitters, e.g. catecholamines, serotonin, and nitric oxide (NO). We established mice unable to synthesize BH4 by disruption of the(More)
Aromatic-L-amino-acid decarboxylase (AADC) is an enzyme that plays an essential role in synthesizing catecholamines and serotonin in neuronal and endocrine tissues. AADC has also been detected in other nonneuronal tissues including liver and kidney, although its physiological role in nonneuronal tissues has not yet been defined. Previously we have cloned a(More)
Nurr1 is a member of the nuclear receptor superfamily of transcription factors that is expressed predominantly in the central nervous system, including developing dopaminergic neurons. Recently, it was demonstrated that Nurr1 is critical for midbrain dopaminergic cell differentiation. In order to investigate a possible relation of Nurr1 with the(More)
Although the existence of three different cDNA forms of human GTP cyclohydrolase I (GCH I) have been reported (Togari et al., 1992), the full-length sequence of any human GCH I cDNA involving poly (A) tail has not yet been documented. In the present study, we first isolated a full-length cDNA clone encoding human GCH I type 1 from human pheochromocytoma(More)
Dopa-responsive dystonia (DRD) is a hereditary dystonia characterized by a childhood onset of fixed dystonic posture with a dramatic and sustained response to relatively low doses of levodopa. DRD is thought to result from striatal dopamine deficiency due to a reduced synthesis and activity of tyrosine hydroxylase (TH), the synthetic enzyme for dopamine.(More)
A full-length cDNA clone for GTP cyclohydrolase I (EC was isolated from a mouse brain cDNA library by plaque hybridization. The nucleotide sequence determination revealed that the length of the cDNA insert was 994 base pairs. The coding region encoded a protein of 241 amino acid residues with a calculated molecular mass of 27,014 daltons. The(More)
Postnatal development of dopaminergic system is closely related to the development of psychomotor function. Tyrosine hydroxylase (TH) is the rate-limiting enzyme in the biosynthesis of dopamine and requires tetrahydrobiopterin (BH4) as a cofactor. To clarify the effect of partial BH4 deficiency on postnatal development of the dopaminergic system, we(More)
2,4-Diamino-6-hydroxypyrimidine (DAHP) is considered a specific inhibitor of BH(4) biosynthesis and is widely used in order to elucidate the possible biological function of BH(4) in various cells. In the present study, we found that both the synthesis of tetrahydrobiopterin (BH(4)) and expression of vascular cell adhesion molecule 1 (VCAM-1) were increased(More)