Tau-dependent HDAC1 nuclear reduction is associated with altered VGluT1 expression

Area of Science:

• Neuroscience
• Molecular Biology
• Epigenetics

Background:

• Tau protein accumulation is a hallmark of Alzheimer's disease (AD) pathology.
• Altered Tau expression disrupts synaptic function, neuronal cell death, and neurodegeneration.
• Epigenetic factors like TRIM28 and HDAC1 play critical roles in synaptic activity and neurodegeneration.

Purpose of the Study:

• To investigate the relationship between Tau protein and epigenetic factors TRIM28 and HDAC1.
• To understand how altered Tau expression affects the expression and localization of TRIM28 and HDAC1.
• To elucidate the role of HDAC1 in mediating Tau's pathological effects on synaptic gene expression.

Main Methods:

• Molecular, imaging, and biochemical approaches were employed.
• Experiments were conducted using the neuronal cell line SH-SY5y.
• Analysis focused on Tau expression, TRIM28 and HDAC1 expression, and HDAC1 subcellular localization.

Main Results:

• Altered Tau expression did not change TRIM28 and HDAC1 expression levels.
• Tau altered expression induced a reduction in nuclear HDAC1.
• Reduced nuclear HDAC1 activity mimicked the effects of increased Tau on synaptic gene expression.

Conclusions:

• A competitive relationship exists between Tau levels and HDAC1 subcellular localization and nuclear activity.
• Tau may contribute to pathological alterations in synaptic gene expression through modulation of nuclear HDAC1.
• These findings offer a potential mechanism linking Tau pathology to epigenetic dysregulation in neurodegeneration.