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Adrenomedullin (ADM), a circulating vasodilatory peptide, plays an important role in the development of sepsis-associated hemodynamic and microcirculatory disorders. While administration of exogenous ADM had beneficial effects in several septic animal models, elevated ADM concentrations are associated with a bad outcome. This prompted us to test the effect of various anti-ADM antibodies in a cecal ligation and puncture (CLP) mouse model.    Methods  To gain new potential compounds for the treatment or prevention of septic shock we followed an alternative strategy to influence the ADM system: High-affinity anti-ADM antibodies with different epitope specificities were developed and their antagonist activity  in vitro  and their ability to reduce mortality in a CLP mouse model were assessed.    Results  An anti-ADM antibody directed against the N-terminus substantially increased the survival of mice in a CLP model (HR = 0.077 (CI = 0.0189 to 0.315),  p  = 0.0004), whereas other antibodies with similar affinities but different epitope specificities were much less potent. The efficacious antibody, in contrast to an anti-C-terminal antibody, only partially inhibited ADM agonist activity  in vitro . Healthy mice were not negatively affected by the N-terminal antibody.    Conclusions  An anti-N-terminal ADM antibody, as opposed to antibodies with other epitope specificities, strongly reduces mortality in CLP mice.    Electronic supplementary material  The online version of this article (doi:10.1186/2197-425X-1-3) contains supplementary material, which is available to authorized users.

Epitope specificity of anti-Adrenomedullin antibodies determines efficacy of mortality reduction in a cecal ligation and puncture mouse model