Abstract Title:

Effects of Aloe vera and Eucalyptus methanolic extracts on experimental toxoplasmosis in vitro and in vivo.

Abstract Source:

Exp Parasitol. 2018 Sep ;192:6-11. Epub 2018 Jul 19. PMID: 30031121

Abstract Author(s):

Bahareh Mirzaalizadeh, Mehdi Sharif, Ahmad Daryani, Mohammad Ali Ebrahimzadeh, Mehryar Zargari, Shahabeddin Sarvi, Saeed Mehrzadi, Mohammad Taghi Rahimi, Zahra Mirabediny, Monireh Golpour, Mahbobeh Montazeri

Article Affiliation:

Bahareh Mirzaalizadeh


Toxoplasmosis is a worldwide disease caused by the protozoan parasite Toxoplasma gondii (T. gondii), which is most commonly treated by pyrimethamine and sulfadiazine. However, this treatment presents several adverse side effects; Thus, new drugs with lower toxicities are urgently needed. In this study the anti-T. gondii activity of A. vera and Eucalyptus extracts were evaluated in vitro using a MTT (3-(4, 5-dimethylthiazol-2-yl) 2, 5-diphenyltetrazolium bromide) assay and in vivo by measuring the survival rates of mice infected with 2 × 10tachyzoites of RH strain of T. gondii and then injected intraperitoneally by different concentrations of extracts for 4 days. Biochemical parameters such as Ferric Reducing Antioxidant Potential (FRAP) and malondialdehyde (MDA) assay were also evaluated. As results, in the in vitro assay, the ICvalues were 13.2, 24.7, 2.63 μg/ml, and the selectivity indexes were 3.3, 2.4, 3.03 for the A. vera, Eucalyptus and pyrimethamine, respectively. The mice treated with Eucalyptus showed a better survival rate than others (P < 0.05). The increased weight of liver and spleen, due to infection, was reduced by treatments. In FRAP assay Eucalyptus showed a better antioxidant activity than the other extracts. MDA levels in both liver and spleen were reduced by treatment. The results show that A. Vera and Eucalyptus possessanti-T. gondii activities in vitro and in vivo, in addition, Eucalyptus shows antioxidant activity with a higher survival rate. Therefore, Eucalyptus may be a useful candidate for treating Toxoplasma infection. Moreover, further studies are required to investigate the fractionations of this plant against T. gondii.

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