Recent advances in cellular biosensor technology to investigate tau oligomerization

Area of Science:

• Neuroscience
• Biochemistry
• Cell Biology

Background:

• Tau protein is vital for normal brain function but implicated in Alzheimer's disease and tauopathies.
• Insoluble tau tangles are hallmarks, yet soluble tau oligomers are increasingly recognized as the primary toxic species.
• Existing methods using recombinant proteins lack the cellular context needed to identify specific toxic tau forms.

Purpose of the Study:

• To review advances in cellular biosensor technologies for monitoring tau oligomerization and aggregation in living cells.
• To discuss the application of these biosensors in studying tau conformation, self-assembly, and cell-to-cell propagation.
• To compare the strengths and weaknesses of different biosensor approaches and their potential for drug discovery.

Main Methods:

• Focus on fluorescence resonance energy transfer (FRET) based biosensors.
• Utilize bimolecular fluorescence complementation (BiFC) assays.
• Employ split luciferase complementation (SLC) techniques.

Main Results:

• Cellular biosensors enable real-time monitoring of tau oligomer and aggregate formation within a native cellular environment.
• These systems facilitate the study of diverse tau conformational states and factors influencing tau self-assembly.
• Biosensors can detect the spread of tau pathology between cells, offering insights into disease mechanisms.

Conclusions:

• Cellular biosensors provide powerful tools for investigating tauopathies, overcoming limitations of in vitro studies.
• They are instrumental in characterizing toxic tau species and understanding their role in disease pathogenesis.
• These technologies hold significant promise for developing novel biomarkers and therapeutic strategies for Alzheimer's disease and related disorders.