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Involvement of apoptosis and calcium mobilization in tetrahydrobiopterin-induced dopaminergic cell death.

Abstract：

:Parkinson's disease is a neurodegenerative disorder associated with selective loss of the dopaminergic neurons in the substantia nigra. We have previously shown that tetrahydrobiopterin (BH4), the obligatory cofactor for dopamine synthesis, exerts selective toxicity on dopamine-producing cells. In the present study we determined, both in vitro and in vivo, whether the cell death induced by this endogenous molecule involves apoptosis, resembling that which occurs in Parkinson's disease. Transmission electron microscopic analysis revealed that the dopamine-producing CATH.a cells underwent ultrastructural changes typical of apoptosis, such as cell shrinkage and chromatin condensation, upon exposure to BH4. The BH4 treatment also caused intranuclear DNA fragmentation as determined by TUNEL staining. A similar phenomenon also occurred in vivo, as the nigral cells became TUNEL-positive upon injection of BH4 into the substantia nigra. The BH4-induced CATH.a cell death seemed to involve macromolecule synthesis because cycloheximide and actinomycin D had protective effects. Concurrent treatment with the caspase inhibitor Z-VAD-FMK also suppressed cell death. BH4 treatment led to increases in the ratio of Bax/Bcl-x(L) mRNA and protein levels. Ca(2+) seemed to play a role in BH4-induced cell death, because BH4 caused an increase in Ca(2+) uptake and the intracellular Ca(2+) release blocker dantrolene, intracellular Ca(2+) chelator BAPTA/AM, and extracellular Ca(2+) chelator EGTA each attenuated the toxicity. These data provide evidence that the dopaminergic cell death induced by BH4 involves apoptosis and suggest relevance of this cell death to degeneration of the dopaminergic system in Parkinson's disease.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Choi HJ,Kim SW,Lee SY,Moon YW,Hwang O

doi

10.1016/s0014-4886(03)00054-2

keywords:

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

281-90

issue

2

eissn

0014-4886

issn

1090-2430

pii

S0014488603000542

journal_volume

181

pub_type

杂志文章

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