Palmitate Compromises C6 Astrocytic Cell Viability and Mitochondrial Function

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• High-fat diets (HFD) are linked to cognitive decline and dementia.
• Astrocytes are implicated in HFD-induced neuroinflammation and brain dysfunction.
• The precise mechanisms by which saturated fatty acids affect astrocytes remain unclear.

Purpose of the Study:

• To investigate the effects of saturated fatty acids on astrocyte viability and mitochondrial function.
• To determine if palmitate or stearate exposure compromises astrocyte health.
• To elucidate the role of astrocytes and mitochondrial dysfunction in obesity-related brain issues.

Main Methods:

• Exposing the C6 astrocyte cell line to palmitate or stearate (200 µM and 400 µM) for 6 hours.
• Assessing cell viability, morphology, inflammatory markers (TNF-α, IL6), and oxidative stress.
• Measuring mitochondrial parameters including membrane potential, mass, respiration, and complex activities.

Main Results:

• Palmitate exposure (400 µM) reduced astrocyte viability and altered morphology (200 µM).
• Palmitate increased inflammatory markers but did not induce oxidative stress.
• Mitochondrial membrane potential and mass significantly decreased; Complex I activity was reduced, while respiration remained unchanged.

Conclusions:

• Palmitate, a saturated fatty acid, induces inflammation and impairs astrocyte mitochondrial function.
• These impairments lead to reduced astrocytic cell viability and morphological changes.
• The findings offer insights into saturated fatty acid, astrocyte, and mitochondrial interactions in obesity-related brain dysfunction.