Three shifting immune states in sepsis could explain why treatments miss their window

Researchers have mapped the shifting immune states that occur in sepsis patients over time, which may help explain why current treatments often fail to improve patient outcomes. Sepsis is a life-threatening condition where the immune response to infection goes awry, leading to organ failure and potentially fatal consequences, even with prompt treatment.

Each year, over 160 million cases and about 21 million deaths globally are attributed to sepsis. Existing treatments focus on combating the underlying infection with antibiotics and supporting vital organ function, but have not successfully enhanced patient outcomes. In a new study published in Immunity, scientists from King's College London sought to better understand the immune response mechanisms that change as sepsis progresses.

By analyzing blood samples collected at four intervals from critically ill sepsis patients at Guy's and St Thomas' NHS Foundation Trust, the researchers built a comprehensive immune profile using multi-layered data on immune cells, gene expression, and protein expression. Machine learning techniques combined these layers to reveal three distinct temporal immune states (STImS) between admission and recovery, which did not align with the clinical stage of sepsis.

For instance, the early immune state (STImS1) differed from the typical early clinical sepsis stage. These findings suggest that identifying the specific immune state a patient is in could guide more effective treatment strategies, potentially improving outcomes for sepsis patients by targeting the misfiring immune system at the right time.