University of Milano-Bicocca study reveals physical contact triggers immune response

Researchers at the University of Milano-Bicocca have identified a mechanism that allows the immune system to detect pathogens through physical contact before specific molecular recognition occurs. The study, published in Nature Immunology and titled ‘Microbial adhesion promotes Piezo1 activation to initiate innate immunity’, suggests that immune cells can perceive the mechanical stimulus of a microorganism adhering to their surface.

This physical perception triggers an immediate containment response via Piezo1 activation. This process acts as a rapid first phase of innate immunity, preceding the traditional second phase where Pattern Recognition Receptors (PRR) identify specific microbial molecules to launch a tailored inflammatory response.

Coordinated by Francesca Granucci and involving researchers from the University of Milan, the University of Pavia, and the Vita-Salute San Raffaele University, the study offers new insights into how the body initiates defense. Future research may focus on modulating these inflammatory responses to either prevent excessive inflammation or enhance rapid local defense.