Different Amyloid-β Self-Assemblies Have Distinct Effects on Intracellular Tau Aggregation

Area of Science:

• Neuroscience
• Biochemistry
• Pathology

Background:

• Alzheimer's disease (AD) involves beta-amyloid (Aβ) and tau protein aggregation.
• The interaction between Aβ and tau is key to AD progression but not fully understood.

Purpose of the Study:

• To investigate how different forms of Aβ affect tau seeding and aggregation.
• To clarify the synergistic relationship between Aβ and tau in Alzheimer's disease.

Main Methods:

• Utilized cellular assays with tau biosensor cells.
• Introduced various amyloid-beta (Aβ) self-assemblies (oligomers and fibrils) into cells.
• Confirmed findings using tau fibril seeds from recombinant tau and mouse brain extracts.

Main Results:

• Amyloid-beta (Aβ) oligomers significantly enhanced seeded tau aggregation in a concentration-dependent manner.
• Transduced Aβ fibrils slightly inhibited tau seeding, while extracellular Aβ fibrils promoted it.
• Alpha-synuclein fibrils did not affect tau seeding, indicating specificity in Aβ-tau interactions.

Conclusions:

• The form and cellular location of amyloid-beta (Aβ) influence its interaction with tau.
• Aβ oligomers enhance tau seeding, highlighting their critical role in Alzheimer's disease pathology.
• These findings are vital for future therapeutic strategies targeting Aβ and tau in AD.