Shedding light on tau protein aggregation: the progress in developing highly selective fluorophores

Area of Science:

• Neuroscience
• Biochemistry
• Medical Imaging

Background:

• Alzheimer's disease (AD) research historically focused on beta-amyloid plaques.
• Emerging understanding highlights the importance of tau protein aggregates and cross-talk interactions in AD pathogenesis.
• Neurofibrillary tangles composed of hyperphosphorylated tau are key pathological hallmarks of AD.

Purpose of the Study:

• To review recent advancements in the development of small-molecule fluorescent dyes for selective tau aggregate detection.
• To provide guidelines for designing novel fluorescent probes targeting tau pathology.
• To support the unraveling of AD etiology by improving diagnostic and research tools.

Main Methods:

• Review of literature on fluorescent dyes for tau aggregate labeling.
• Analysis of probe architectures and spectral properties (visible to near-infrared).
• Evaluation of pharmacological profiles, including blood-brain-barrier permeability and in vivo efficacy in AD models.

Main Results:

• Diverse fluorescent dye architectures have been developed for tau aggregate labeling in histological sections.
• Several near-infrared (NIR) emissive dyes demonstrate good pharmacological properties.
• In vivo studies show successful labeling of tau tangles in small-animal models of AD and tauopathies.

Conclusions:

• Small-molecule fluorescent dyes targeting tau aggregates are crucial for AD research.
• NIR-emissive probes with enhanced blood-brain-barrier permeability offer significant potential for in vivo imaging.
• Continued development of selective tau-binding probes will advance understanding and diagnosis of Alzheimer's disease.