During infection, phagocytic cells pursue homeostasis in the host via multiple mechanisms that control microbial invasion. Neutrophils respond to infection by exerting a variety of cellular processes, including chemotaxis, activation, phagocytosis, degranulation and the generation of reactive oxygen species (ROS). Calcium (Ca) signaling and the activation of specific Ca channels are required for most antimicrobial effector functions of neutrophils. The transient receptor potential melastatin-2 (TRPM2) cation channel has been proposed to play important roles in modulating Ca mobilization and oxidative stress in neutrophils. In the present study, we use a mouse model of infection to define the role of TRPM2 in the regulation of neutrophils' functions during infection. We show that the susceptibility of Trpm2 mice to infection is characterized by increased migration rates of neutrophils and monocytes to the liver and spleen in the first 24 h. During the acute phase of infection, Trpm2 mice developed septic shock, characterized by increased serum levels of TNF-α, IL-6, and IL-10. Furthermore, depletion of neutrophils demonstrated a critical role of these immune cells in regulating acute inflammation in Trpm2 infected mice. Gene expression and inflammatory cytokine analyses of infected tissues further confirmed the hyperinflammatory profile of Trpm2 neutrophils. Finally, the increased inflammatory properties of Trpm2 neutrophils correlated with the dysregulated cytoplasmic concentration of Ca and potentiated membrane depolarization, in response to . In conclusion, our findings suggest that the TRPM2 channel plays critical functional roles in regulating the inflammatory properties of neutrophils and preventing tissue damage during infection.