Excessive inflammation is associated with tissue damage caused by over-activation of the innate immune system. This can range from mild disease to extreme conditions, such as multiple organ dysfunction syndrome (MODS) and acute respiratory distress (ARDS). In marked contrast to adaptive immunity which is very sensitive to immune modulators such as steroids, the innate immune system cannot be sufficiently targeted by currently available anti-inflammatory drugs.

The investigators hypothesize that pre-treatment with C1-esterase inhibitor in a human endotoxemia model can modulate the innate immune response.

In this study, human endotoxemia will be used as a model for inflammation. Subjects will, prior to endotoxin administration, receive C1 esterase inhibitor or placebo. Blood will be sampled to determine the levels of markers of the innate immune response.

Inclusion Criteria:

• Healthy male volunteers (18-35 years old)

Exclusion Criteria:

• Relevant medical history
• Drug-, nicotine-abuses
• Tendency towards fainting
• Hyper- or hypotension
• Use of any medication