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Pathological tau disrupts brain network activity in tauopathies like Alzheimer's disease. This study shows altered neuronal firing patterns and slower brain oscillations, impacting overall neocortical function.

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Area of Science:

  • Neuroscience
  • Pathology

Background:

  • Pathological tau accumulation causes neurodegeneration in tauopathies, including Alzheimer's disease.
  • While tau's cellular effects are known, its impact on intact neocortical network function is unclear.

Purpose of the Study:

  • To investigate the effects of pathological tau on neocortical network activity in a mouse model of tauopathy.

Main Methods:

  • In vivo intracellular and extracellular recordings of neocortical pyramidal cells in rTg4510 mice.
  • Analysis of neuronal activity during different arousal states before significant cell death.

Main Results:

  • Transgenic mice exhibited slower membrane potential oscillations during sleep and anesthesia.
  • Neuronal firing rates were reduced, with altered firing patterns including longer latencies and inter-spike intervals.
  • Pathological tau altered state transitions and Down states in membrane potentials.

Conclusions:

  • Pathological tau, even in a fraction of neurons, significantly alters neocortical network activity.
  • These network-level changes precede widespread cell death and may contribute to cognitive decline in tauopathies.