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In vitro and in vivo effects of natural honey on Leishmania major.

Leishmaniosis is an insect-borne disease whose clinical manifestations range from skin ulcer to visceral disease. Antimony compounds are currently known to be the main treatment for leishmaniosis, but there are limitations to their use. This study was performed to determine the in vitro and in vivo efficiency of honey on a standard strain of Leishmania major parasite in comparison with glucantime and amphotericin as the first line treatment. Leishmania major was exposed to different concentrations of honey extract at 400, 200, 100, 50, 25, 12.5, 6.25 μg/ml. The effectiveness of honey concentrations was determined by counting the parasite by Neubauer's chamber. Then, using the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric method, for promastigotes and macrophages then IC50 was calculated. A flow cytometry test was performed and necrosis and apoptosis diagrams were drawn. Next, the effect of the honey on the amastigotes inside macrophage cells was investigated. Finally, for the in vivo experimentation, the parasite was injected in the base of BALB/c mice tails and the resulting wounds were treated with honey. The results of all tests showed that the honey extract at 400 μg/ml concentration had the best effects on all stages. The honey has lethal effects on Leishmania parasite in vitro as well as therapeutic effects on wounds caused by the parasite. Further experiments are recommended to evaluate the performance of the extract on the parasite in volunteer human models.