A novel rapid host cell entry pathway determines the intracellular fate of Staphylococcus aureus.

A rapid sphingomyelin-dependent entry pathway in S. aureus alters intracellular fate, influencing bacterial replication and host cell death within minutes of contact.

• Why it matters: Understanding how S. aureus enters host cells and affects infection progression is crucial for developing new treatments, especially given its ability to evade immune responses and resist antibiotics.
• What they did: Researchers infected endothelial cells with S. aureus and used microscopy and cell-based assays to identify a fast, lysosomal calcium-dependent pathway involving sphingomyelin breakdown, occurring within minutes.
• The result: The pathway's timing impacts bacterial escape from vesicles, replication, and host cell death, suggesting that targeting sphingomyelinase activity could offer new strategies to control persistent infections.