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05
Feb
Tau Protein: Structure, Pathology, and Neurodegeneration
Exploring the critical role of Tau in neuronal health and Alzheimer's disease progression.
Tau protein is a highly soluble microtubule-associated protein (MAP) predominantly expressed in neurons. Under physiological conditions, tau regulates microtubule assembly, stabilization, and cytoskeletal organization—essential processes for maintaining neuronal morphology and facilitating intracellular transport.
In neurodegenerative disorders such as Alzheimer’s disease (AD), tau undergoes abnormal hyperphosphorylation, transitioning from soluble monomers into insoluble neurofibrillary tangles (NFTs).
Figure 1: Pathological transformation of Tau protein in neurodegeneration.
Pathogenic Mechanisms of Tau Aggregation
The formation and accumulation of NFTs represent a central pathogenic process. This deposition contributes to neuronal dysfunction through three primary mechanisms:
1. Axonal Transport Disruption
Impaired microtubule-dependent transport prevents the delivery of neurotransmitters and organelles to synaptic terminals, leading to synaptic failure.
2. Mitochondrial Dysfunction
Tau aggregates reduce bioenergetic efficiency and increase Reactive Oxygen Species (ROS), causing oxidative neuronal damage.
3. Prion-like Propagation
Misfolded tau species spread via synaptic connections, facilitating progressive neurodegeneration across the brain.
Isoform Diversity & Therapeutic Outlook
Tau Isoform Diversity
The human tau gene undergoes alternative splicing, resulting in six distinct isoforms. These differ in microtubule-binding domains, influencing their susceptibility to pathological modification.
Therapeutic Targets
Current research focuses on three major disease-modifying interventions:
- • Tau Phosphorylation Inhibitors: Preventing pathological modification.
- • Anti-tau Monoclonal Antibodies: Neutralizing extracellular aggregates.
- • Aggregation Inhibitors: Directly targeting fibril formation.
Biofargo team
