Tau oligomer

Tau oligomers are soluble, non-filamentous, granular-shaped assemblies derived from the microtubule-associated protein tau, which normally stabilizes microtubules, maintains neuronal processes, and regulates axonal transport. In pathological conditions like Alzheimer's disease and other tauopathies, tau misfolds and hyperphosphorylates, forming these oligomers that lose microtubule-promoting activity and instead sequester normal tau, causing microtubule depolymerization and neuronal dysfunction. Tau oligomerization initiates with dimer formation, often cysteine-dependent but also independent, progressing to higher-order structures that exhibit neurotoxicity in vitro and in vivo models. These species, detected at low abundance (<0.1% of total tau), are buffer-soluble, hyperphosphorylated (e.g., 64-70 kDa species), and recognized by specific antibodies like T22 and TOC1, distinguishing them from monomeric tau or fibrillar neurofibrillary tangles. Their propagation of toxic conformations underscores their role as early pathological intermediaries in neurodegeneration, though no approved drugs directly target them yet. Tau oligomers represent a promising therapeutic focus due to their central role in tauopathy progression, preceding tangle formation and correlating with cognitive decline.

Other names

Tau dimerTau multimer64 kDa tauAD P-tauT22-positive tauTOC1-positive tau