Hoover BR, Reed MN, Su JJ, Penrod RD, Kotilinek LA, Grant MK, Pitstick R, Carlson GA, Lanier LM, Yuan LL, Ashe KH, Liao DZ. Tau Mislocalization to Dendritic Spines Mediates Synaptic Dysfunction Independently of Neurodegeneration. Neuron. 2010;68(6):1067-1081. PMID: 21172610. DOI: 10.1016/j.neuron.2010.11.030.
Summary
This study showed that tau can disrupt synaptic function before overt neurodegeneration occurs. Using tau-transgenic mouse models, the authors found that pathological tau mislocalized from axons into dendritic spines, where it impaired excitatory synaptic transmission. The work helped shift attention from insoluble tau aggregates alone toward soluble and mislocalized tau species as drivers of cognitive dysfunction. Importantly, the study demonstrated that synaptic impairment could occur independently of neuron loss, suggesting that early tau-mediated dysfunction may be reversible.
Key Findings
- Tau mislocalized to dendritic spines in disease-relevant models.
- Synaptic dysfunction occurred before overt neurodegeneration.
- Dendritic spine tau was linked to impaired excitatory transmission.
- Soluble/mislocalized tau emerged as a functional toxic species.
Impact on the Caspase-2/Tau Program
This paper established the concept that tau-driven cognitive impairment can arise from synaptic dysfunction rather than irreversible neuron loss. It provided a biological foundation for targeting upstream mechanisms that produce synaptotoxic tau species.