Abstract：
:The pathophysiologic basis of tardive dyskinesia remains unclear. It has been proposed that tardive dyskinesia may be a result of excitotoxic neurodegeneration in the striatum caused by a neuroleptic-induced increase in striatal glutamate release and impaired energy metabolism. To investigate this hypothesis, haloperidol decanoate (38 mg/kg/four weeks intramuscularly) and the succinate dehydrogenase inhibitor 3-nitropropionic acid (8 mg/kg/day via subcutaneous osmotic mini-pumps), were administered alone or together for 16 weeks to four-months-old rats. Control rats received sesame oil intramuscularly and had empty plastic tubes subcutaneously. Vacuous chewing movements, a putative analogue to human tardive dyskinesia, were recorded during and after drug treatment. Haloperidol alone, 3-nitropropionic acid alone, and 3-nitropropionic acid+haloperidol treatments induced an increase in vacuous chewing movements. However, vacuous chewing movements were more pronounced and appeared earlier in rats treated with 3-nitropropionic acid+haloperidol. After drug withdrawal, increases in vacuous chewing movements persisted for 16 weeks in the haloperidol alone and 3-nitropropionic acid+haloperidol group and for four weeks in the 3-nitropropionic acid alone group. Brains from each group were analysed for histopathological alterations. Bilateral striatal lesions were present only in rats with high levels of vacuous chewing movements in the 3-nitropropionic acid+haloperidol-treated rats. Nerve cell depletion and astrogliosis were prominent histopathologic features. There was selective neuronal sparing of both large- and medium-sized aspiny striatal neurons. These results suggest that mild mitochondrial impairment in combination with neuroleptics results in striatal excitotoxic neurodegeneration which may underlie the development of persistent vacuous chewing movements in rats and possibly irreversible tardive dyskinesia in humans.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Andreassen OA,Ferrante RJ,Beal MF,Jørgensen HAdoi
10.1016/s0306-4522(98)00160-2subject
Has Abstractpub_date
1998-12-01 00:00:00pages
639-48issue
3eissn
0306-4522issn
1873-7544pii
S0306-4522(98)00160-2journal_volume
87pub_type
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