Trypanothione metabolism in Leishmania parasite (Not standardized; "TryS/TR/TSH2 axis" used in literature, with key components including Trypanothione reductase (TryR or TR), Trypanothione synthetase (TryS), and trypanothione (TSH2).)

Leishmania parasite thiol metabolism refers specifically to the parasite’s unique trypanothione-based redox system, which is vital for detoxifying reactive oxygen species and maintaining redox homeostasis inside the parasite. Unlike mammals, which use glutathione and thioredoxin, Leishmania synthesizes and utilizes trypanothione [T(SH)2], a conjugate of two molecules of glutathione and one molecule of spermidine. This molecule, along with its enzymes trypanothione synthetase (TryS) and trypanothione reductase (TR), constitutes a system critical to the parasite’s defense against oxidative stress and thus to its survival in the hostile environment of macrophages. Targeting this pathway, especially trypanothione reductase, has been a major focus for the development of new antileishmanial drugs since it is essential for parasite viability and absent in humans, making it a selective and promising therapeutic target[1][5][7].

Other names

Leishmania thiol redox metabolismtrypanothione pathwayT(SH)2 metabolismTryS/TR/TSH2 pathwayLeishmania antioxidant pathway

Inhibition of trypanothione reductase (blocks regeneration of reduced trypanothione, impairing parasite antioxidant defenses); Induction of oxidative stress inside parasite; Disruption of redox homeostasis leading to parasite death; Inducing ROS-mediated apoptosis and mitochondrial dysfunction in parasite cells.