Different subtypes of neutrophils (pro-inflammatory or immune suppressive) produce different mediators and directly interact with lymphocytes to promote organ injury and death in sepsis. APN, antigen presenting neutrophils; RMN, reverse-migrated neutrophils; LDN, low-density neutrophils; OLFM4, olfactomedin 4; Siglec-F, sialic-acid-binding immunoglobulin-like lectin-F; NE, neutrophil elastase; ROS, reactive oxygen species.