PMID- 26690352 OWN - NLM STAT- MEDLINE DCOM- 20160624 LR - 20190816 IS - 1932-6203 (Electronic) IS - 1932-6203 (Linking) VI - 10 IP - 12 DP - 2015 TI - Heme Oxygenase-1 Inhibits HLA Class I Antibody-Dependent Endothelial Cell Activation. PG - e0145306 LID - 10.1371/journal.pone.0145306 [doi] LID - e0145306 AB - Antibody-mediated rejection (AMR) is a key limiting factor for long-term graft survival in solid organ transplantation. Human leukocyte antigen (HLA) class I (HLA I) antibodies (Abs) play a major role in the pathogenesis of AMR via their interactions with HLA molecules on vascular endothelial cells (ECs). The antioxidant enzyme heme oxygenase (HO)-1 has anti-inflammatory functions in the endothelium. As complement-independent effects of HLA I Abs can activate ECs, it was the goal of the current study to investigate the role of HO-1 on activation of human ECs by HLA I Abs. In cell cultures of various primary human macro- and microvascular ECs treatment with monoclonal pan- and allele-specific HLA I Abs up-regulated the expression of inducible proinflammatory adhesion molecules and chemokines (vascular cell adhesion molecule-1 [VCAM-1], intercellular cell adhesion molecule-1 [ICAM-1], interleukin-8 [IL-8] and monocyte chemotactic protein 1 [MCP-1]). Pharmacological induction of HO-1 with cobalt-protoporphyrin IX reduced, whereas inhibition of HO-1 with either zinc-protoporphyrin IX or siRNA-mediated knockdown increased HLA I Ab-dependent up-regulation of VCAM-1. Treatment with two carbon monoxide (CO)-releasing molecules, which liberate the gaseous HO product CO, blocked HLA I Ab-dependent EC activation. Finally, in an in vitro adhesion assay exposure of ECs to HLA I Abs led to increased monocyte binding, which was counteracted by up-regulation of HO-1. In conclusion, HLA I Ab-dependent EC activation is modulated by endothelial HO-1 and targeted induction of this enzyme may be a novel therapeutic approach for the treatment of AMR in solid organ transplantation. FAU - Zilian, Eva AU - Zilian E AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. FAU - Saragih, Hendry AU - Saragih H AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. AD - Faculty of Biology, Gadjah Mada University, Yogyakarta, Indonesia. FAU - Vijayan, Vijith AU - Vijayan V AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. FAU - Hiller, Oliver AU - Hiller O AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. FAU - Figueiredo, Constanca AU - Figueiredo C AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. FAU - Aljabri, Abid AU - Aljabri A AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. FAU - Blasczyk, Rainer AU - Blasczyk R AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. FAU - Theilmeier, Gregor AU - Theilmeier G AD - Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany. FAU - Becker, Jan Ulrich AU - Becker JU AD - Institute of Pathology, University Hospital of Cologne, Cologne, Germany. FAU - Larmann, Jan AU - Larmann J AD - Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany. FAU - Immenschuh, Stephan AU - Immenschuh S AD - Institute for Transfusion Medicine, Hannover Medical School, Hannover, Germany. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20151221 PL - United States TA - PLoS One JT - PloS one JID - 101285081 RN - 0 (Antibodies, Monoclonal, Murine-Derived) RN - 0 (CCL2 protein, human) RN - 0 (CXCL8 protein, human) RN - 0 (Chemokine CCL2) RN - 0 (Histocompatibility Antigens Class I) RN - 0 (ICAM1 protein, human) RN - 0 (Interleukin-8) RN - 0 (Vascular Cell Adhesion Molecule-1) RN - 126547-89-5 (Intercellular Adhesion Molecule-1) RN - EC 1.14.14.18 (HMOX1 protein, human) RN - EC 1.14.14.18 (Heme Oxygenase-1) SB - IM MH - Antibodies, Monoclonal, Murine-Derived/*pharmacology MH - Chemokine CCL2/biosynthesis MH - Heme Oxygenase-1/*metabolism MH - *Histocompatibility Antigens Class I MH - Human Umbilical Vein Endothelial Cells/cytology/*enzymology MH - Humans MH - Intercellular Adhesion Molecule-1/biosynthesis MH - Interleukin-8/biosynthesis MH - Vascular Cell Adhesion Molecule-1/biosynthesis PMC - PMC4686182 COIS- Competing Interests: The authors have declared that no competing interests exist. EDAT- 2015/12/23 06:00 MHDA- 2016/06/25 06:00 PMCR- 2015/12/21 CRDT- 2015/12/23 06:00 PHST- 2015/07/17 00:00 [received] PHST- 2015/12/01 00:00 [accepted] PHST- 2015/12/23 06:00 [entrez] PHST- 2015/12/23 06:00 [pubmed] PHST- 2016/06/25 06:00 [medline] PHST- 2015/12/21 00:00 [pmc-release] AID - PONE-D-15-31434 [pii] AID - 10.1371/journal.pone.0145306 [doi] PST - epublish SO - PLoS One. 2015 Dec 21;10(12):e0145306. doi: 10.1371/journal.pone.0145306. eCollection 2015.