Ameliorative Effects of Thyme and Calendula Extracts Alone or in Combination Against Aflatoxins-induced Oxidative Stress and Genotoxicity in Rat Liver

Overview

Journal Cytotechnology

Specialties Biotechnology
Genetics

Date 2013 Oct 8

PMID 24096837

Citations 12

Authors

Sekena H Abdel-Aziem

Aziza M Hassan

Ezzeldein S El-Denshary

Mohamed A Hamzawy

Fathia A Mannaa

Mosaad A Abdel-Wahhab

Affiliations

Soon will be listed here.

Abstract

The aims of the current work were to evaluate the hepatoprotective effect of calendula flowers and/or thyme leave extracts on aflatoxins (AFs)-induced oxidative stress, genotoxicity and alteration of p53 bax and bcl2 gene expressions. Eighty male Sprague-Dawley rats were divided into eight equal groups including: the control group, the group fed AFs-contaminated diet (2.5 mg/kg diet) for 5 weeks, the groups treated orally with thyme and/or calendula extract (0.5 g/kg b.w) for 6 weeks and the groups pretreated orally with thyme and/or calendula extract 1 week before and during AFs treatment for further 5 weeks. Blood, liver and bone marrow samples were collected for biochemical analysis, gene expression, DNA fragmentation and micronucleus assay. The results showed that AFs induced significant alterations in oxidative stress markers, increased serum AFP and inflammatory cytokine, percentage of DNA fragmentation, the expression of pro-apoptotic gene p53 and bax accompanied with a decrease in the expression of bcl2. Animals treated with the extracts 1 week before AFs treatment showed a significant decrease in oxidative damage markers, micronucleated cells, DNA fragmentation and modulation of the expression of pro-apoptotic genes. These results suggested that both calendula and thyme extracts had anti-genotoxic effects due to their higher content of total phenolic compounds.

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