[A new role for neutrophils during sepsis: target and source of interleukin-12].
The immune response against a bacterial aggression involves the monocytes-macrophages and polymorphonuclear neutrophils (PMN) in the first line of defense. This natural or innate immunity controls the proliferation of micro-organisms while waiting for the development of aspecific immunity related to lymphocytes. Establishing a link between innate and specific immunity, interleukin-12 (IL-12) is an essential cytokine of the inflammatory response. In a first in vitro study, we showed that IL-12 potentiates the effect of LPS on the production of IL-8 by stimulated PMN, the main chemotactic and activating cytokine of neutrophils. IL-12 would thus support the local recruitment of PMN via an autocrine loop of amplification. In a second in vivo study in septic patients, we noted a defect in the pulmonary and systemic production of IL-12, suggesting a dysregulation of innate immunity during the course of sepsis.
Ethuin
F
F
Département d'anesthésie-réanimation, hôpital Saint-Louis, Paris, France. ethuin.f@wanadoo.fr
Chollet-Martin
S
S
Jacob
L
L
D006801:Humans; D018664:Interleukin-12 / Q000502:physiology*; D009504:Neutrophils / Q000502:physiology*; D018805:Sepsis / Q000276:immunology*
D018664:Interleukin-12