Published April 2017
Critical Care Medicine
Until recently, doctors assumed that neutrophils—the most abundant of the body’s leukocytes and the first line of response to infection—were fairly homogenous and presented the same throughout the body.
But new findings from the Division of Critical Care Medicine indicate that a pathogenic neutrophil subset and an associated protein appear to be far more prevalent in patients with septic shock compared to healthy controls.
“We found evidence that suggests there is a subset of neutrophils in patients who present with septic shock, a subset that expresses the olfacotmedin-4 (OLMF4) protein,” says Matthew Alder, MD, PhD, who co-authored the study with Hector Wong, MD, director of the Division of Critical Care Medicine. “The more of these subset neutrophils a patient has, the worse the prognosis.”
The study examined outcomes involving 41 patients with septic shock compared to a 29-patient pediatric ICU control group and 33 healthy controls. Among patients who died of septic shock, serum protein concentrations of the up-regulated olfactomedin-4 protein were nearly 100 times higher than among healthy controls. Patients with higher levels of the pathogenic neutrophils also were far more likely to experience organ failures.
Researchers are continuing to investigate these subsets of neutrophils in the body. They seek to confirm whether OLFM4 is a marker of cellular damage and whether it can be used as a marker for septic shock diagnosis.