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1 North West Injury Research Collaboration, 2 Medical Research Council Trauma Group, and Departments of 3 Endocrinology and 4 Rheumatology, Hope Hospital, Salford, M6 8HD, United Kingdom
Type 2 diabetes is associated with
biochemical evidence of low-grade inflammation, and experimental
studies have suggested that both insulin and glucose affect
inflammatory responses. To determine the effect of in vivo changes in
glucose availability and plasma insulin concentrations in humans, we
administered 20 U/kg Escherichia coli lipopolysaccharide
(LPS) or saline (control) to 14 subjects during a euglycemic
hyperinsulinemic clamp (n = 6) or an infusion of
sterile saline (n = 8). Parallel in vitro studies on human
whole blood were undertaken to determine whether there was a direct
effect of glucose, insulin, and leptin on proinflammatory cytokine
production. Infusion of glucose and insulin significantly amplified
and/or prolonged the cardiovascular, plasma interleukin-6 (IL-6), tumor
necrosis factor-
(TNF-
), and counterregulatory hormone responses
to LPS, whereas the effects on fever, plasma norepinephrine
concentrations, and oxygen consumption were unaffected. In vitro
studies showed no modulation of LPS-stimulated IL-6 or TNF-
production by glucose, insulin, or leptin at physiologically relevant
concentrations. Hyperinsulinemia indirectly enhances key components of
the systemic inflammatory and stress responses in this human model of infection.
diabetes; cytokines; lipopolysaccharide; inflammation; sepsis
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