Tau: A Signaling Hub Protein

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Tau protein's interaction with microtubules is phosphorylation-dependent.
• Hypotheses suggest tau's microtubule-stabilizing role extends to neurons, with reduced stability linked to Alzheimer's disease and tauopathies.
• Research has primarily focused on tau as a substrate, examining modifications' impact on microtubule binding.

Purpose of the Study:

• To explore mechanisms linking tau to the regulation of kinases and phosphatases.
• To discuss tau's potential role as a scaffolding protein in signaling pathways.
• To review evidence for tau's involvement in normal and pathological signaling in neurons and glia.

Main Methods:

• Literature review of published experimental work.
• Analysis of studies on tau's interactions with kinases and phosphatases.
• Examination of evidence linking disease-related tau to signaling pathway misregulation.

Main Results:

• Tau may function as a scaffolding protein, regulating phosphorylation-based signaling pathways through interactions with kinases and phosphatases.
• Disease-related tau species are linked to the misregulation of these signaling pathways.
• Tau participates in cellular processes sustaining neuronal and glial function via scaffolding and regulation of kinases/phosphatases.

Conclusions:

• Tau's functions extend beyond microtubule stabilization to include a role as a signaling hub.
• Understanding tau as a signaling regulator is crucial for interpreting experimental results and advancing tau biology.
• Tau's scaffolding role in discrete subcellular compartments impacts neuronal and glial function in both health and disease.