Targeting NINJ1-mediated cell rupture to treat inflammatory diseases.

Cell death can terminate in plasma membrane rupture to release potent pro-inflammatory intracellular contents thereby contributing to inflammatory diseases. Cell rupture is an active process, mediated by the membrane protein ninjurin-1 (NINJ1) in pyroptosis, post-apoptosis lysis, ferroptosis, and forms of necrosis. Once activated, NINJ1 clusters into large oligomers within the membrane to initiate cellular lysis. Recent preclinical studies have demonstrated that inhibiting NINJ1 is a new strategy for treating immune-mediated diseases. Indeed, both small molecule inhibitors and neutralizing antibodies can target NINJ1 clustering to preserve plasma membrane integrity and mitigate disease pathogenesis. In this Perspective, we provide a summary of the current state of knowledge and recent developments in targeting cellular integrity during cell death through NINJ1 inhibition to treat inflammatory disease, with a focus on liver injury. As these NINJ1-mediated cell death pathways are pivotal in maintaining health and contribute to disease pathogenesis when dysregulated, the studies discussed within have broad implications across the immunologic basis of molecular medicine.