Extracellular tau is toxic to neuronal cells

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Neuronal degeneration in diseases like Alzheimer's releases intracellular proteins, including tau.
• Extracellular tau protein exhibits toxicity to cultured neuronal cells, with toxicity correlating to protein aggregation levels.

Purpose of the Study:

• To investigate the toxic effects of extracellular tau protein on neuronal cells.
• To explore the mechanism by which tau induces cell death, focusing on calcium signaling.

Main Methods:

• Cultured neuroblastoma cells were treated with tau protein.
• Intracellular calcium levels and cell viability were monitored.

Main Results:

• Addition of tau protein to neuroblastoma cells resulted in increased intracellular calcium.
• The observed increase in intracellular calcium was followed by cell death.

Conclusions:

• Extracellular tau protein is toxic to neuronal cells, inducing cell death.
• Tau-mediated neurotoxicity may involve the activation of muscarinic receptors, leading to calcium release from intracellular stores.