Abstract
Background: Early enteral nutrition is associated with a lower incidence of intraabdominal abscess in severely injured patients than parenteral nutrition (PN). We explored the underlying mechanisms by examining the influence of nutrition route on nuclear factor κB (NFκB) activation in peritoneal exudative cells (PECs) and peritoneal cytokine levels. Methods: Thirty male Institute Cancer Research mice were randomized to chow (n = 10), IV PN (n = 10), or intragastric (IG) PN (n = 10) and fed for 5 days. PECs were harvested at 2 or 4 hours after intraperitoneal injection of 2 mL of 1% glycogen. Intranuclear NFκB activity in PECs was examined by laser scanning cytometry. Cytokine (tumor necrosis factor-α [TNF-α], macrophage inflammatory protein-2 [MIP-2], interleukin-10 [IL-10]) levels in peritoneal lavaged fluid were determined by enzyme-linked immunosorbent assay. Results: Intranuclear NFκB at 2 hours was significantly higher in the chow and IG-PN groups than in the IV-PN group. TNF-α and IL-10 levels of the chow group were significantly higher than those of IV-PN mice at 2 hours, whereas those of IG-PN mice were midway between those of the chow and IV-PN groups. MIP-2 was significantly higher in the chow group than in the IG-PN and IV-PN mice at 2 hours. TNF-α levels correlated positively with intranuclear NFκB activity in PECs. Conclusions: Enteral nutrition may improve peritoneal defense by preserving early NFκB activation in PECs and cytokine responses.
We clarified an important mechanism for impaired peritoneal defense during lack of enteral nutrition. Parenterally fed mice showed delay of NFκB activation in peritoneal exudative cells and cytokine responses in glycogen-induced peritonitis, as compared with enterally fed animals.
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