In Vitro Antileishmanial Effects of Saffron Compounds, Crocin and Stigmasterol, on Iranian Strain of Leishmania major (MHOM/IR/75/ER)

Background: due to numerous side effects of common drugs in treatment of leishmaniasis, new therapeutic approaches focus on herbal compounds. therefore, we aimed to determine the effect of crocin and stigmasterol on in-vitro growth of promastigotes and amastigotes of leishmania major in the department of parasitolo-gy, pasteur institute, tehran, iran in 2018. methods: the effect of different concentrations of crocin and stigmasterol were evaluated by determining their in-vitro inhibitory effects on promastigotes and amastigotes of the l. major using mtt assay. results: the fatality rate was 65.27% and 71.96% for crocin and stigmasterol re-spectively at 24 h post-culture in concentration of 50 μg/ml. the mean inhibitory effect of crocin and stigmasterol on l major amastigotes after 72 h were 52.22% and 38.96%. conclusion: the crocin and stigmasterol had efficient adverse effects on pro-mastigote and amastigotes of l. major, hence, further studies on the anti-leishmanial effects of these herbal compounds in human and animal models are recommended.