Sex-specific vulnerabilities in human astrocytes underpin the differential impact of palmitic acid.

The study investigates the effects of palmitic acid (PA) on human astrocytes, highlighting sex-specific differences in their vulnerability. The researchers found that high concentrations of PA significantly reduced cell viability in male astrocytes more than in female ones. Male astrocytes exhibited a higher production of cytosolic reactive oxygen species (ROS), while female astrocytes showed higher levels of superoxide ions in the mitochondria. Additionally, female astrocytes demonstrated stronger antioxidant defenses, including increased expression of proteins like catalase, Gpx-1, and Nrf2. The study also found differences in the expression of estrogenic and other hormone receptors, which were more prominent in females, suggesting a protective mechanism mediated by endogenous hormones. This highlights that male astrocytes are more susceptible to damage from fatty acids.

This research contributes to the understanding of how sex-specific factors can influence cellular responses to metabolic stress, particularly in the context of neurometabolic and neurodegenerative diseases.