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- W2000370614 abstract "To study the species difference of guinea pigs and rats in response to 5-hydroxytryptophan (5-HTP), we injected both animals intracisternally with 5,7-dihydroxytryptamine. In rats with 5,7-dihydroxytryptamine lesions, 5-HTP evoked the well described myoclonic-serotonergic syndrome. In the guinea pig, 5,7-dihydroxytryptamine lesions significantly increased the severity of myoclonic response to 5-HTP (150 mg/kg) compared to vehicle controls, resulting in lethal convulsions. Guinea pigs treated with 5,7-dihydroxytryptamine did not develop spontaneous myoclonus, or when treated with 5-HTP, other ‘serotonergic behaviors’ such as lateral head weaving, hindlimb abduction, and forepaw tapping. Guinea pigs tolerated intracisternal 5,7-dihydroxytryptamine less well than rats, with a higher mortality, although immediate post-injection convulsions were less severe and did not require phenobarbital prophylaxis. Staged lower doses of 5,7-dihydroxytryptamine (100–200 μg) were better tolerated than a single high dose of neurotoxin (400 μg). The regional profile of 5,7-dihydroxytryptamine lesions in the guinea pig resembled that of the rat, with maximal depletion of 5-HT in spinal cord and selected forebrain structures, and little effect in diencephalon and midbrain. Depletions in the guinea pig were less selective for 5-HT using desipramine pretreatment than in the rat. In naive guinea pigs and rats, regional content of 5-HT was similar. These data suggest that the functional integrity of serotonergic neurons is not requisite for the expression of myoclonus induced by 5-HTP in the guinea pig. 5,7-Dihydroxytryptamine lesions in the guinea pig resulted in behavioral and neurochemical similarities and differences in comparison with the rat." @default.
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- W2000370614 date "1987-11-01" @default.
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- W2000370614 title "The guinea pig myoclonic model: behavioral supersensitivity to 5-hydroxytryptophan induced by intracisternal 5,7-dihydroxytryptamine" @default.
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- W2000370614 doi "https://doi.org/10.1016/0014-2999(87)90538-3" @default.
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