title: Granulocyte-based immune response against decellularized or glutaraldehyde cross-linked vascular tissue.
abstract: Supporting structures derived from biological tissue have been used in numerous tissue-engineering applications. This study focuses on the immune response of human leukocytes toward decellularized or glutaraldehyde (GA) cross-linked vascular tissue in vitro. Porcine and human pulmonary roots were sterilized with antibiotics, decellularized or cross-linked with GA. Proteins of the vascular tissue were extracted and the migratory response of human leukocytes toward protein extracts was examined using an in vitro migration chamber. Transmigrated leukocytes were counted and subsets (lymphocytes, monocytes, granulocytes) analyzed by flow cytometry. Decellularization significantly reduced the migration of monocytes compared to native porcine tissue. Although the proportion of transmigrating lymphocytes was much lower, decellularization again reduced the migratory response. Surprisingly, after decellularization granulocyte migration was still significantly higher than the negative control. Results comparable to those obtained with porcine material were found when human tissue was used for the experiments. Interestingly, migratory behavior toward extracts of GA-fixed porcine tissue was similar to that of decellularized specimens. We have shown that decellularization of vascular tissue reduces lymphocyte and monocyte recruitment comparable to cross-linking treatment. However, the migration of granulocytes, which are also known to be strongly involved in early inflammatory reactions, could be abolished neither by decellularization nor by fixation with GA.
authors.affiliation: Medical University of Vienna, University Clinic of Surgery, Austria.
authors.forename: Erwin
authors.initials: E
authors.lastname: Rieder
authors.forename: Anneliese
authors.initials: A
authors.lastname: Nigisch
authors.forename: Barbara
authors.initials: B
authors.lastname: Dekan
authors.forename: Marie-Theres
authors.initials: MT
authors.lastname: Kasimir
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Mühlbacher
authors.forename: Ernst
authors.initials: E
authors.lastname: Wolner
authors.forename: Paul
authors.initials: P
authors.lastname: Simon
authors.forename: Günter
authors.initials: G
authors.lastname: Weigel
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000502:physiology*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D005976:Glutaral / Q000737:chemistry*; D006098:Granulocytes / Q000166:cytology / Q000276:immunology*; D006801:Humans; D007109:Immunity / Q000502:physiology*; D007962:Leukocytes / Q000166:cytology / Q000276:immunology; D011651:Pulmonary Artery / Q000737:chemistry / Q000166:cytology*; D013552:Swine; D023822:Tissue Engineering
chemical_list: D003432:Cross-Linking Reagents; D005976:Glutaral