Increased circulating IL-1 β, IL-6 and INF-γ were detected following the first LPS injection but, following subsequent administration of LPS, cytokine concentrations did not differ from baseline.
This was despite the continuing presence of clinical and physiological responses (e.g., fever, increased cortisol and haptoglobin
levels), which are traditionally thought to be mediated by such
cytokines. The lack of detection of cytokines in the plasma after the
third and fifth administration of LPS might be due to a lower amplitude of response, relative to the first challenge, and associated
with their instability and short half-life in plasma (Gabay and
Kushner, 1999; Murata et al., 2004).
Increased circulating IL-1 β, IL-6 and INF-γ were detected following the first LPS injection but, following subsequent administration of LPS, cytokine concentrations did not differ from baseline.This was despite the continuing presence of clinical and physiological responses (e.g., fever, increased cortisol and haptoglobinlevels), which are traditionally thought to be mediated by suchcytokines. The lack of detection of cytokines in the plasma after thethird and fifth administration of LPS might be due to a lower amplitude of response, relative to the first challenge, and associatedwith their instability and short half-life in plasma (Gabay andKushner, 1999; Murata et al., 2004).
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