MK801- and scopolamine-induced amnesias are reversed by an Amazonian herbal locally used as a "brain tonic".

Abstract:

RATIONALE:Traditional remedies prepared from Ptychopetalum olacoides (PO) are used throughout the Amazon to alleviate age-related conditions. These formulas are mainly used by elders, and alleged effects may be related to the anticholinesterase properties identified in a standardized ethanol extract of this species [P. olacoides standardized ethanol extract (POEE)]. OBJECTIVES:To further characterize the potential of this extract for developing drugs useful to treat cognitive deficits, the effects of POEE on scopolamine (scop)- and MK801-induced amnesias (acquisition, consolidation, and retrieval) in mice were investigated. RESULTS:Scop (3.0 mg/kg, ip) significantly impaired memory (all three phases) in the step-down inhibitory avoidance protocol. As expected, MK801 (0.1 mg/kg, ip) was amnesic regarding acquisition and consolidation, but not retrieval. POEE (100 mg/kg, ip) reversed the scop-induced impairment in all three phases of long-term and short memories, whereas only the memory consolidation deficit was reversed with MK801-induced amnesia. CONCLUSIONS:This study complements previously reported promnesic properties of this plant extract and suggests that POEE may be further developed for treating conditions associated with cognitive deficits, especially those linked with cholinergic malfunction.

journal_title

Psychopharmacology

authors

da Silva AL,Silva Martins Bd,Linck Vde M,Herrmann AP,Mai N,Nunes DS,Elisabetsky E

doi

10.1007/s00213-008-1272-y

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

165-72

issue

1-3

eissn

0033-3158

issn

1432-2072

journal_volume

202

pub_type

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