The thioredoxin reductase and glutathione reductase system i

Naegleria fowleri, also known as the brain-eating amoeba, is commonly found in soil, lakes, rivers, and hot springs. It can also be found in poorly maintained swimming pools. This amoeba causes a disease called Primary Amoebic Meningoencephalitis (PAM) which is a rare but almost inevitably fatal infection (fatality rate is 96 %), occurring mostly in children. These usually become infected when contaminated water enters the nose while swimming or diving. N. fowleri migrates up the olfactory nerves into to the brain where it destroys the brain tissue. The main reasons for the high fatality rate are delays in initiation of treatment due to misdiagnosis and a lack of a specific treatment options. For this reason, the main aim of this research study is to investigate the thioredoxin- and glutathione-mediated redox systems in Naegleria spp. and to evaluate their potential as drug targets. A valid drug target has to meet two requirements: the target must be (a), of essential physiological importance to the pathogen and (b), either absent or at least sufficiently distinct from its counterpart in the human host. If our research enterprise reveals that these redox systems could be valid drug targets, future studies will be carried out to design drugs for the treatment against N. fowleri infections.

Amoebae of the genus Naegleria are commonly found in warm water. While typically free-living, Naegleria fowleri, known as the brain eating amoeba, can pose significant health risks when coming into contact with human during water activities. Naegleria infections can lead to severe diseases, including primary amoebic meningoencephalitis (PAM), which is often fatal. In our research, we delved into the world of Naegleria to understand how they function and how we can combat the disease that it causes. We found that Naegleria species express only one enzyme named thioredoxin reductase, which belongs to the large type (TrxR-L). This enzyme is involved in the defence mechanisms against oxidative stress. In this project, we investigated the TrxR system of Naegleria and elucidated the physiological roles. Furthermore, we evaluated the potential of targeting these TrxRs for chemotherapy against Naegleria infections. Our findings demonstrate that auranofin exhibits high efficacy against Naegleria trophozoites, even at low concentrations. This is particularly significant as there are no specific drugs available to treat Naegleria infections, making them incredibly difficult to combat. This research contributes to our understanding of Naegleria biology and offers potential avenues for the development of novel therapeutic strategies to combat Naegleria infections, addressing a critical need in public health.