Milk-derived peptone reduces EHEC virulence by inhibiting the type III secretion system.

Milk-derived peptone from casein significantly inhibits the type III secretion system activity in Escherichia coli O157:H7, reducing bacterial adherence and translocation.

• Why it matters: Understanding how diet influences bacterial virulence is crucial for developing non-antibiotic strategies to combat pathogenic infections and improve human health.
• What they did: Researchers used plant- and animal-based peptones to simulate dietary protein sources and tested their effects on EHEC virulence, focusing on the T3SS activity and bacterial behavior.
• The result: Milk-derived peptone decreased T3SS activity and shifted bacteria toward a more motile state, also inhibiting other T3SS-positive pathogens, paving the way for novel dietary-based therapies.