Clinical trial NCT00785018: In Vivo Effects of C1-esterase Inhibitor on the Innate Immune Response During Human Endotoxemia
Official title: In Vivo Effects of C1-esterase Inhibitor on the Innate Immune Response During Human Endotoxemia
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Endotoxemia
Inflammation
Multi Organ Dysfunction Syndrome
Keywords: Endotoxin
C1-inhibitor
Inflammation
Sepsis
Multi organ dysfunction syndrome
Complement activation
Lead sponsor: Radboud University Medical Center
Sponsor class: OTHER
First posted: 2008-11-05
Enrollment: 20
Sex: MALE
Minimum age (years): 18
Maximum age (years): 35
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: BASIC_SCIENCE

Brief summary: 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 failure (MOF). 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.

We hypothesize that C1-esterase inhibitor can modulate the innate immune response.

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

Detailed description: Rationale:

There is an unmet need for novel therapeutic agents focused on the complications caused by acute and excessive activation of the innate immune response after injury. As this activation responds poorly to currently used therapy including inhaled steroids novel agents need to be tested, developed or applied. C1INH comprises a potential important target drug for antagonism of the excessive activation of the innate immune response during acute inflammation seen after injury. This might be achieved by inhibiting the redistribution and homing of cells to inflammatory tissues.

Before going to a clinical trial in injured human subjects we want to perform a pilot study in healthy volunteers to exploit the "human endotoxemia model". The human endotoxemia model permits elucidation of key players in this pro-inflammatory response in humans in vivo, therefore serving as a useful tool to investigate potential novel therapeutic strategies in a standardized setting. The model bears striking resemblance to LPS models in animals. These latter studies have shown that C1INH protects from neutrophil mediated disease \[1-4\]. Together with the finding that C1INH has been shown to be safe in the treatment of humans, we propose to use this protein in the treatment of neutrophil driven acute inflammation such as seen after injury.

Objectives:

Primary objective: The primary objective of the study is to determine the effect of C1INH on systemic activation of the innate immune response induced by LPS challenge. This response will be objectivised by measurement of enhanced TNF-α levels 90 min after LPS challenge.

Secondary Objective(s): The secondary objective of the study is to determine the effect of C1INH on redistribution of neutrophils in the human endotoxemia model.

Study design: Double-blind placebo-controlled randomized intervention study in healthy human volunteers during experimental endotoxemia.

Study population: Non-smoking healthy male volunteers, age 18-35 yrs Intervention: Subjects will receive C1INH in a dose of 100 U/kg (n=10) or placebo (n=10) 30 min after LPS administration. Pre-hydration will be performed by infusion of 1.5 L 2.5% glucose/0.45% saline solution in 1 hour before LPS administration. LPS derived from E coli O:113 will be injected (2 ng/kg iv., infusion rate 1 minute).

Main study parameters/endpoints: The main study parameter is the concentration of circulating cytokines after LPS in the absence or presence of C1INH. Secondary study parameters include the influence of C1INH on the redistribution pattern of neutrophils and neutrophil phenotypes.

Eligibility criteria: Inclusion Criteria:

* Healthy male volunteers (18-35 years old)

Exclusion Criteria:

* Relevant medical history
* Drug-, nicotine-, alcohol abuses
* Tendency towards fainting
* Hyper- or hypotension

Primary outcomes:
measure: Cytokines and other markers of Inflammation
timeFrame: 24 hrs after LPS administration
measure: Neutrophil redistribution and phenotype
timeFrame: 24 hours after LPS administration
measure: C1-inhibitor and complement concentration and activity
timeFrame: 24 hours after LPS administration
measure: Hemodynamic response
timeFrame: 24 hours after LPS administration
measure: Markers of Renal Injury
timeFrame: 24 hours after LPS administration
Secondary outcomes:
Other outcomes:
Locations:
city: Nijmegen
country: Netherlands
facility: Radboud University Nijmegen Medical Centre
Study officials:
affiliation: Radboud University Nijmegen Medical Centre, The Netherlands
name: Peter Pickkers, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References: