Prions, prionoids and protein misfolding disorders

Area of Science:

• Neuroscience
• Molecular Biology
• Pathology

Background:

• Prion diseases are progressive, incurable neurodegenerative conditions.
• Prions are infectious proteins, specifically the aggregated pathological form (PrPSc) of the cellular prion protein (PrPC).
• The term 'prion' has expanded to include non-infectious protein aggregates, leading to the application of prion concepts to other neurodegenerative diseases.

Purpose of the Study:

• To clarify the definition and scope of prion diseases.
• To differentiate bona fide prion diseases from other protein misfolding disorders.
• To explore shared and distinct pathomechanisms between prion diseases and other protein misfolding disorders.

Main Methods:

• Literature review and conceptual analysis.
• Comparison of pathomechanisms in prion diseases and protein misfolding disorders.
• Analysis of the definition and application of the 'prion' concept.

Main Results:

• Prions are defined as infectious agents composed of misfolded prion protein (PrPSc).
• The prion concept is increasingly applied to other neurodegenerative diseases involving protein aggregation.
• Prion diseases and other protein misfolding disorders share some common disease mechanisms.
• The transmissibility of prion diseases remains a unique characteristic.

Conclusions:

• Prion diseases are distinct from other protein misfolding disorders due to their unique transmissibility.
• While sharing some mechanisms, the fundamental nature of prion agents necessitates their classification as a separate category.
• Understanding these distinctions is crucial for developing targeted therapeutic strategies.