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A Comparison of RML Prion Inactivation Efficiency by Heterogeneous and Homogeneous Photocatalysis
Ioannis Paspaltsis1, Eirini Kanata1, Sotirios Sotiriadis1
1Laboratory of Pharmacology, Department of Pharmacy, School of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Abstract:
Prions are proteinaceous pathogens responsible for a variety of devastating diseases in mammals, including scrapie in sheep and goats, chronic wasting disease in cervids, and Creutzfeldt-Jakob disease (CJD) in humans. They are characterized by their exceptional persistence to common inactivation procedures. This applies to all possible sources of prion contamination as prions may be present in the tissues and biological fluids of infected individuals. Hence, efficient prion inactivation procedures are still being sought to minimize the risk of intra- or inter-species transmission. In the past, photocatalytic treatment has been proven to be capable of efficiently oxidizing and inactivating prions. In the present study, the efficacy of homogeneous photo-Fenton-based photocatalysis as well as heterogeneous photocatalysis with TiO2 in reducing RML mouse scrapie infectivity was evaluated. Prion inactivation was assessed by means of a bioassay, and the results were confirmed by in vitro experiments. While the prion infectivity of the RML mouse scrapie was reduced after treatment with the photo-Fenton reagent, the heterogeneous photocatalytic treatment of the same prion strain completely eliminated prion infectivity.
Insights
Researchers evaluated two prion inactivation methods: photo-Fenton and heterogeneous photocatalysis. Heterogeneous photocatalysis using TiO2 completely eliminated prion infectivity, offering a promising solution for prion decontamination.
Area of Science:
- Biochemistry and Molecular Biology
- Infectious Diseases
- Materials Science
Background:
- Prions are resilient proteinaceous pathogens causing fatal neurodegenerative diseases in mammals.
- Existing prion inactivation methods are often insufficient due to prion resistance.
- Prion contamination poses risks in healthcare and agriculture, necessitating effective decontamination strategies.
Purpose of the Study:
- To evaluate the efficacy of homogeneous photo-Fenton and heterogeneous photocatalysis with TiO2 for prion inactivation.
- To assess the reduction of RML mouse scrapie infectivity using these advanced oxidation processes.
- To compare the effectiveness of homogeneous versus heterogeneous photocatalytic treatments for prion decontamination.
Main Methods:
- Prion inactivation was investigated using homogeneous photo-Fenton reagent and heterogeneous photocatalysis with titanium dioxide (TiO2).
- The efficacy of treatments was determined by assessing the reduction in RML mouse scrapie infectivity.
- Prion inactivation was confirmed through bioassays and validated with in vitro experiments.
Main Results:
- Homogeneous photo-Fenton treatment showed a reduction in prion infectivity.
- Heterogeneous photocatalytic treatment with TiO2 completely eliminated RML mouse scrapie infectivity.
- In vitro experiments corroborated the bioassay findings for both treatment methods.
Conclusions:
- Heterogeneous photocatalysis using TiO2 is a highly effective method for complete prion inactivation.
- Photocatalytic treatments offer a promising approach for developing robust prion decontamination protocols.
- Further research into photocatalysis can lead to improved strategies for preventing prion disease transmission.
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