Stress-Dependent Changes in the CacyBP/SIP Interacting Protein S100A6 in the Mouse Brain

Area of Science:

• Neuroscience
• Molecular Biology
• Stress Physiology

Background:

• S100A6 protein is found throughout the nervous system.
• Elevated S100A6 levels are linked to neurodegenerative diseases.
• The role of S100A6 in stress response is not well understood.

Purpose of the Study:

• To investigate the involvement of S100A6 protein in the stress response of mice.
• To quantify changes in S100A6 levels in various brain structures under chronic mild stress.

Main Methods:

• Western blotting was used to measure S100A6 protein levels.
• Immunohistochemistry was employed to visualize S100A6 expression patterns.
• Mice were subjected to chronic mild stress conditions.

Main Results:

• S100A6 protein levels significantly decreased in the brainstem, olfactory bulb, cerebellum, hippocampus, and hypothalamus of stressed mice.
• High S100A6 expression was observed in astrocytes near brain ventricles and hypothalamic tanycytes.
• Immunolabeling intensity for S100A6 was reduced in all studied brain structures in stressed mice, with a notable decrease in the arcuate nucleus.

Conclusions:

• Chronic mild stress leads to a decrease in S100A6 protein levels across multiple brain regions in mice.
• While cell phenotypes remained unchanged, the reduction in S100A6 suggests its involvement in stress response mechanisms.
• Further research is needed to elucidate the functional significance of S100A6 in the context of stress.