Abstract：
:We have examined the effects of a variety of classical and atypical neuroleptic drugs on mitochondrial NADH ubiquinone oxido-reductase (complex I) activity. Sagittal slices of mouse brain incubated in vitro with haloperidol (10 nM) showed time- and concentration-dependent inhibition of complex I. Similar concentrations of the pyridinium metabolite of haloperidol (HPP+) failed to inhibit complex I activity in this model; indeed, comparable inhibition was obtained only at a 10000-fold higher concentration of HPP+ (100 microM). Treatment of brain slices with haloperidol resulted in a loss of glutathione (GSH), while pretreatment of slices with GSH and alpha-lipoic acid abolished haloperidol-induced loss of complex I activity. Incubation of mitochondria from haloperidol treated brain slices with the thiol reductant, dithiothreitol, completely regenerated complex I activity demonstrating thiol oxidation as a feasible mechanism of inhibition. In a comparison of different neuroleptic drugs, haloperidol was the most potent inhibitor of complex I, followed by chlorpromazine, fluphenazine and risperidone while the atypical neuroleptic, clozapine (100 microM) did not inhibit complex I activity in mouse brain slices. The present studies support the view that classical neuroleptics such as haloperidol inhibit mitochondrial complex I through oxidative modification of the enzyme complex.
journal_name
Neuropharmacologyjournal_title
Neuropharmacologyauthors
Balijepalli S,Boyd MR,Ravindranath Vdoi
10.1016/s0028-3908(98)00215-9subject
Has Abstractpub_date
1999-04-01 00:00:00pages
567-77issue
4eissn
0028-3908issn
1873-7064pii
S0028390898002159journal_volume
38pub_type
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