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Prion protein interaction with soil humic substances: environmental implications.

Gabriele Giachin¹, Joanna Narkiewicz¹, Denis Scaini²

¹Laboratory of Prion Biology, Department of Neuroscience, Scuola Internazionale Superiore di Studi Avanzati (SISSA), Trieste, Italy.

|June 18, 2014

Summary

Humic substances (HS) in soil bind to prions, preventing their replication and potentially reducing the environmental transmission of transmissible spongiform encephalopathies (TSE) like scrapie and chronic wasting disease (CWD).

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Area of Science:

Environmental science
Neuroscience
Biochemistry

Background:

Transmissible spongiform encephalopathies (TSEs) are fatal neurodegenerative diseases caused by prions.
Prions persist in soil, complicating disease management for animals like sheep, goats, and cervids.
Soil organic components, specifically humic substances (HS), are investigated for their role in prion interactions.

Purpose of the Study:

To investigate the interaction between soil humic substances (HS) and prion protein (recPrP).
To evaluate the anti-prion activity of HS in cellular and biochemical assays.
To understand the environmental implications of HS-prion interactions for disease transmission.

Main Methods:

Studied the adsorption kinetics of recombinant prion protein (recPrP) with HS.
Performed structural and biochemical characterization of HS-recPrP adducts.
Assessed the anti-prion activity of HS in prion-infected neuronal cells and amyloid seeding assays.

Main Results:

Humic substances (HS) effectively adsorb both recombinant prion protein (recPrP) and infectious prions.
HS demonstrate potent anti-prion activity in prion-infected neuronal cells.
HS inhibit prion replication in amyloid seeding assays by sequestering prions.

Conclusions:

Humic substances (HS) act as natural anti-prion agents by binding and sequestering prions in soil.
HS adsorption of prions may significantly reduce their environmental availability and hinder disease transmission.
Findings highlight the environmental relevance of HS in mitigating the spread of prion diseases.