title: A New Application for Albumin Dialysis in Extracorporeal Organ Support: Characterization of a Putative Interaction Between Human Albumin and Proinflammatory Cytokines IL-6 and TNFα.
abstract: Albumin dialysis in extracorporeal organ support is often performed in the treatment of liver failure as it facilitates the removal of toxic components from the blood. Here, we describe a possible effect of albumin dialysis on proinflammatory cytokine levels in vitro. Initially, albumin samples were incubated with different amounts of cytokines and analyzed by enzyme-linked immunosorbent assay (ELISA). Analysis of interleukin 6 (IL-6) and tumor necrosis factor alpha (TNFα) levels indicated that increased concentrations of albumin reduce the measureable amount of the respective cytokines. This led to the hypothesis that the used proinflammatory cytokines may interact with albumin. Size exclusion chromatography of albumin spiked with cytokines was carried out using high-performance liquid chromatography analysis. The corresponding fractions were evaluated by immunoblotting. We detected albumin and cytokines in the same fractions indicating an interaction of the small-sized cytokines IL-6 and TNFα with the larger-sized albumin. Finally, a two-compartment albumin dialysis in vitro model was used to analyze the effect of albumin on proinflammatory cytokines in the recirculation circuit during 6-h treatment. These in vitro albumin dialysis experiments indicated a significant decrease of IL-6, but not of TNFα, when albumin was added to the dialysate solution. Taken together, we were able to show a putative in vitro interaction of human albumin with the proinflammatory cytokine IL-6, but with less evidence for TNFα, and demonstrated an additional application for albumin dialysis in liver support therapy where IL-6 removal might be indicated.
authors.affiliation: Center for Extracorporeal Organ Support (CEOS), Department of Internal Medicine, University of Rostock, Rostock, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Pfensig
authors.affiliation: Center for Extracorporeal Organ Support (CEOS), Department of Internal Medicine, University of Rostock, Rostock, Germany.
authors.forename: Adrian
authors.initials: A
authors.lastname: Dominik
authors.affiliation: Center for Extracorporeal Organ Support (CEOS), Department of Internal Medicine, University of Rostock, Rostock, Germany.
authors.forename: Luise
authors.initials: L
authors.lastname: Borufka
authors.affiliation: Division of Nephrology, Department of Medicine, Rostock University Medical Center, Rostock, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Hinz
authors.affiliation: Division of Nephrology, Department of Medicine, Rostock University Medical Center, Rostock, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Stange
authors.affiliation: Center for Extracorporeal Organ Support (CEOS), Department of Internal Medicine, University of Rostock, Rostock, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Eggert
mesh_terms: D000418:Albumins / Q000627:therapeutic use*; D004797:Enzyme-Linked Immunosorbent Assay; D005112:Extracorporeal Circulation / Q000379:methods*; D006801:Humans; D015850:Interleukin-6 / Q000097:blood*; D008099:Liver / Q000098:blood supply*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood*
chemical_list: D000418:Albumins; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha
keywords: Albumin dialysis; Cytokine removal; Extracorporeal organ support; Liver support