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Specific inhibition of pathological prion protein accumulation by small interfering RNAs
Nathalie Daude1, Mathieu Marella, Joelle Chabry
1Institut de Pharmacologie Moléculaire et Cellulaire, Unité Mixte de Recherche 6097, Centre National de la Recherche Scientifique. 660, route des lucioles, 06560 Valbonne, France.
Abstract:
Development of transmissible spongiform encephalopathies (TSEs) pathogenesis requires the presence of both the normal host prion protein (PrP-sen) and the abnormal pathological proteinase-K resistant isoform (PrP-res). PrP-res forms highly insoluble aggregates, with self-perpetuating properties, by binding and converting PrP-sen molecules into a likeness of themselves. In the present report, we show that small interfering RNA (siRNA) duplexes trigger specific Prnp gene silencing in scrapie-infected neuroblastoma cells. A non-passaged, scrapie-infected culture transfected with siRNA duplexes is depleted of PrP-sen and rapidly loses its PrP-res content. The use of different murine-adapted scrapie strains and host cells did not influence the siRNA-induced gene silencing efficiency. More than 80% of transfected cells were positive for the presence of fluorescein-labeled siRNA duplexes. No cytotoxicity associated with the use of siRNA was observed during the time course of these experiments. Despite a transient abrogation of PrP-res accumulation, our results suggest that the use of siRNA may provide a new and promising therapeutic approach against prion diseases.
Insights
Small interfering RNA (siRNA) effectively silences the prion protein gene (Prnp) in scrapie-infected cells. This approach reduces pathological prion protein (PrP-res) levels, offering a potential therapeutic strategy for prion diseases.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Transmissible spongiform encephalopathies (TSEs) pathogenesis depends on host prion protein (PrP-sen) and pathological PrP-res.
- PrP-res aggregates convert normal PrP-sen into pathological forms, driving disease progression.
Purpose of the Study:
- To investigate the efficacy of small interfering RNA (siRNA) for Prnp gene silencing in prion disease models.
- To assess the impact of siRNA-mediated gene silencing on PrP-sen and PrP-res levels in infected cells.
Main Methods:
- Transfection of scrapie-infected neuroblastoma cells with specific siRNA duplexes targeting the Prnp gene.
- Quantification of PrP-sen and PrP-res levels post-transfection.
- Assessment of siRNA cellular uptake and cytotoxicity.
Main Results:
- siRNA successfully silenced the Prnp gene in scrapie-infected cells, leading to depletion of PrP-sen.
- A rapid and significant reduction in PrP-res content was observed in transfected cells.
- siRNA-induced gene silencing was efficient across different scrapie strains and host cells, with over 80% transfection efficiency and no observed cytotoxicity.
Conclusions:
- siRNA-mediated Prnp gene silencing is a potent strategy for reducing prion protein accumulation.
- The observed transient abrogation of PrP-res accumulation suggests siRNA as a promising therapeutic avenue for prion diseases.