, Volume 40, Issue 1, pp 117–122 | Cite as

Heme-Exposed Pooled Therapeutic IgG Improves Endotoxemia Survival

  • Iglika Djoumerska-AlexievaEmail author
  • Lubka T. Roumenina
  • Tsvetanka Stefanova
  • Tchavdar Vassilev
  • Jordan D. Dimitrov


Antibody repertoires of healthy humans and animals contain a fraction of antibodies able to acquire additional polyspecificity following exposure to several biologically relevant redox molecules (free heme, reactive oxygen species, ferrous ions, HOCl, etc.). The physiological role of these “hidden” polyspecific antibodies is poorly understood. Similar to inherently polyspecific antibodies, those with induced polyspecificicty may also have immunoregulatory properties. We have previously shown that a pooled human IgG preparation, modified by the exposure to ferrous ions, acquires the ability to significantly improve survival of animals with polymicrobial sepsis or aseptic systemic inflammation induced by bacterial lipopolysaccharide or zymosan administration. In the present study, we have analyzed the effects of administration of heme-exposed pooled human IgG in the same models of sepsis and aseptic systemic inflammation. The administration of a single dose of heme-exposed pooled IgG has resulted in a significant increase in the survival of mice with endotoxinemia, but not in those with polymicrobial sepsis and zymosan-induced severe generalized inflammation. Finally, we have provided evidence that the anti-inflammatory effect of heme-exposed IgG can be explained by scavenging of pro-inflammatory mediators.


IVIg sepsis antibody polyspecificity passive immunotherapy heme 



This work was supported by grants from the Bulgarian Science Fund (grant DFNI B02/29) and from the Agence Nationale de la Recherche (ANR-13-JCV1-006-01).

Compliance with Ethical Standards

The experimental protocols were approved by the Animal Care Commission of the Institute of Microbiology in accordance with National and European Regulations (BABH protocol #105/10 July 2014).

Supplementary material

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ESM 1 (JPG 32 kb)


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Immunology, Stefan Angelov Institute of MicrobiologyBulgarian Academy of SciencesSofiaBulgaria
  2. 2.UMRS 1138, Centre de Recherche des CordeliersSorbonne Universités, UPMC Univ Paris 06ParisFrance
  3. 3.INSERM, UMR_S 1138Centre de Recherche des CordeliersParisFrance
  4. 4.Sorbonne Paris Cité, UMR_S 1138, Centre de Recherche des CordeliersUniversité Paris DescartesParisFrance

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