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Leishmaniasis is a vector-borne parasitic neglected tropical disease caused by a group of about 30 different species of the genus  Leishmania . It is transmitted by the bite of female phlebotomies sand fly. Three main clinical manifestations of leishmaniasis include cutaneous, visceral, and mucocutaneous leishmaniasis. Visceral leishmaniasis (VL) caused by  Leishmania donovani , is an infection of reticuloendothelial system and fatal if untreated. Cholesterol, a sterol that is prominent in the mammalian cell membranes whereas stigmasterol and ergosterol are more prevalent in plants, yeast, and protozoa, respectively. Ergosterols which is absent in human being, is an important constituent of parasite membrane. Sterol C-24 reductase ( LdSR ) enzyme catalyzes the final step in the ergosterol biosynthesis pathway. The inhibition of biosynthesis of ergosterol may lead to decreased cell viability and growth. Here, we performed the molecular docking-based virtual screening of a library of natural ligands against LdSR to identify a potential inhibitor to fight leishmaniasis. Capsaicin, prenyletin, flavan-3-ol, resveratrol, and gingerol showed the top binding affinity towards  LdSR . Based upon ADME properties and bioactivity score, gingerol showed the best lead-likeness and drug-likeness properties. Hence, we further annotated its leishmanicidal properties. We found that gingerol inhibited the growth and proliferation of promastigotes as well as intra-macrophagic amastigotes. Gingerol exerted its antileishmanial action through the induction of reactive oxygen species (ROS) in concentration-dependent manner. Gingerol induced ROS led to apoptosis. Overall, this study described that gingerol would act as possible inhibitor to  LdSR .

Identification of potential inhibitors for Sterol C-24 reductase of Leishmania donovani through virtual screening of natural compounds