Sph-mediated mtDNA release and autophagy-dependent ferroptosis contribute to Staphylococcus aureus-induced mastitis.

Sphingomyelin phosphodiesterase (Sph) from S. aureus promotes ferroptosis by disrupting mitochondrial function and activating the cGAS-STING pathway, contributing to mastitis pathology.

• Why it matters: Understanding how S. aureus induces tissue damage is crucial for developing targeted therapies for mastitis, yet the specific mechanisms involving bacterial virulence factors remain unclear.
• What they did: The study used molecular and cellular approaches to show that Sph deficiency reduces ferroptosis, and that Sph interacts with Mic60 to cause mitochondrial DNA release, activating cGAS-STING and leading to GPX4 degradation.
• The result: Findings reveal Sph as a key factor in mitochondrial disruption and ferroptosis, suggesting that targeting Sph could mitigate S. aureus-induced mastitis and improve treatment strategies.