Hypergravity and ERK Inhibition Combined Synergistically Reduce Pathological Tau Phosphorylation in a...

Area of Science:

• Neuroscience
• Cell Biology
• Biophysics

Background:

• Neurodegenerative diseases are characterized by protein aggregation, such as Tau pathology.
• Understanding cellular responses to altered gravity is crucial for space biology and terrestrial applications.
• Mouse Hippocampal Neuronal Cells (HT22) provide a model for studying neuronal stress and neurodegeneration.

Purpose of the Study:

• To investigate the impact of hypergravity (HG) on Tau protein aggregation in vitro.
• To determine if HG influences the phosphorylation of Tau protein.
• To explore the synergistic effects of HG and ERK inhibition on Tau aggregation.

Main Methods:

• Utilized Mouse Hippocampal Neuronal Cells (HT22) cultured under hypergravity (50× g).
• Induced Tau aggregation using neurofibrillary tangle seeds.
• Administered ERK inhibitor PD-0325901 in combination with HG.
• Quantified Tau aggregate area and measured phosphorylation at pS262 and pS396 residues.

Main Results:

• Hypergravity (50× g) significantly reduced the area of Tau aggregates.
• The combination of HG and PD-0325901 synergistically decreased Tau aggregate area.
• Decreased Tau phosphorylation at pS262 and pS396 was observed under HG conditions.

Conclusions:

• Hypergravity exposure demonstrates a protective effect against Tau aggregation in a neuronal cell model.
• Combined HG and ERK inhibition offers a synergistic approach to mitigate Tau pathology.
• These findings suggest hypergravity as a potential therapeutic strategy for neurodegenerative conditions involving Tau aggregation.