Effects of acute lorazepam administration on aminergic activity in normal elderly subjects: relationship to performance effects and apolipoprotein genotype.

Abstract:

:The effects of acute lorazepam challenges on plasma (p) HVA, MHPG, and 5-HIAA, and their relationship to drug-induced cognitive and motor deficits and the apolipoprotein (APOE)-epsilon4 allele were examined. Eighteen healthy elderly (8 epsilon4 carriers) received placebo or acute oral lorazepam doses (0.5 mg or 1 mg) in random sequence, 1-week apart. Cognitive assessment and plasma levels of pHVA, pMHPG, and p5-HIAA were determined at baseline and at 1, 2.5, and 5 h postchallenge. There was no drug-to-placebo difference in monoamine levels and no consistent relationship between changes in monoamine levels and cognitive performance, regardless of epsilon4 status. However, the 1.0 mg dose increased p5-HIAA in epsilon4 carriers, whereas it caused a reduction in noncarriers. Higher baseline pMHPG and p5-HIAA levels were associated with better baseline memory. The epsilon4 allele may modulate the effect of lorazepam on p5-HIAA, but further studies are needed to confirm this finding and elucidate its possible significance.

journal_name

Neurochem Res

journal_title

Neurochemical research

authors

Pomara N,Willoughby LM,Hashim A,Sershen H,Sidtis JJ,Wesnes K,Greenblatt DJ,Lajtha A

doi

10.1023/b:nere.0000026402.09466.54

keywords:

subject

Has Abstract

pub_date

2004-07-01 00:00:00

pages

1391-8

issue

7

eissn

0364-3190

issn

1573-6903

journal_volume

29

pub_type

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