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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Neuromodulatory property of standardized extract Ginkgo biloba L. (EGb 761) on memory: Behavioral and molecular evidence

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Author(s):
Oliveira, Daniela R. [1, 2, 3] ; Sanada, Priscila F. [1] ; Saragossa, Filho A. C. [1] ; Innocenti, L. R. [3] ; Oler, Gisele [2] ; Cerutti, Janete M. [2] ; Cerutti, Suzete M. [1, 3]
Total Authors: 7
Affiliation:
[1] Univ Fed Sao Paulo, Dept Biol Sci, BR-09972270 Eldorado Diadema, SP - Brazil
[2] Univ Fed Sao Paulo, Dept Morphol, Genet Bases Thyroid Tumor Lab, Div Genet, BR-09972270 Eldorado Diadema, SP - Brazil
[3] Univ Sao Francisco, Lab Neural Plast & Phytotherapy, BR-12900000 Braganca Paulista, SP - Brazil
Total Affiliations: 3
Document type: Review article
Source: Brain Research; v. 1269, p. 68-89, MAY 7 2009.
Web of Science Citations: 24
Abstract

Although it has been suggested that the standardized Ginkgo biloba leaf extract (Egb 761) may have a beneficial effect on memory, the cellular and molecular changes that underlie this process are not yet well defined. The present study evaluated the effects of acute (one dose) or subacute treatments (one daily dose/seven days) with EGb 761 (0.5 g kg(-1) and 1.0 g kg(-1)) on rats submitted to a conditioned emotional response (CER) in comparison with positive (4 mg kg(-1) Diazepam) and negative (12% Tween 80) control groups. To this end, eighty (n = 10/group) adult, male, Wistar rats (+/- 250-300 g) were used in an off-baseline CER procedure. We here observed that the rats submitted to an acute and subacute EGb 761 treatments had acquisition of fear conditioning. Additionally, we investigate if the expression of genes previously associated with classical conditioning (CREB-1 and GAP-43) and new candidate genes (GFAP) are modulated following EGb 761 acute treatment. CREB-1, GAP-43 and GFAP mRNA and protein expressions were evaluated using both quantitative PCR (qPCR) and immunohistochemical analysis, respectively. We here show, for the first time, that EGb 761 modulated GAP-43, CREB-1 and GFAP expression in the prefrontal cortex, amygdala and hippocampus. We observed an underexpression of GAP-43 in all structures evaluated and over-expression of GFAP in the amygdala and hippocampus following acute G. biloba treatment when compared to control group (Tween; p<0.01). GAP-43 expression was decreased in prefrontal cortex and hippocampus in the subacute treatment with EGb 761. Subacute treatment with EGb 761 lead to a decreased CREB-1 in mPFC (p<0.001) and increased in the hippocampus to 1.0 g kg(-1) G. biloba group (p<0.001). The results obtained from immunohistochemical analysis support our aforementioned findings and revealed that the changes in expression occurred within specific regions in the areas evaluated. All together, our findings not only provide new evidence for a role of EGb 761 on memory but also identify molecular changes that underlie the fear memory consolidation. (C) 2008 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 05/60330-8 - Molecular markers in diagnosis and prognosis of patients with tumors of the human thyroid: transition from basic to clinical research
Grantee:Janete Maria Cerutti
Support Opportunities: Research Projects - Thematic Grants