PMID- 28344919 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20201001 IS - 2196-3029 (Print) IS - 2196-3029 (Electronic) VI - 2 IP - 3 DP - 2015 Sep TI - Antibodies to HLA Molecules Mimic Agonistic Stimulation to Trigger Vascular Cell Changes and Induce Allograft Injury. PG - 222-232 LID - 10.1007/s40472-015-0065-6 [doi] AB - Human leukocyte antigen (HLA)-induced signaling in endothelial and smooth muscle cells causes dramatic cytoskeletal rearrangement, increased survival, motility, proliferation, adhesion molecule and chemokine expression, and adhesion of leukocytes. These mechanisms are directly related to endothelial activation, neointimal proliferation, and intragraft accumulation of leukocytes during antibody-mediated rejection (AMR) and chronic rejection. Clustering of HLA by ligands in trans, such as in antigen-presenting cells at the immune synapse, triggers physiological functions analogous to HLA antibody-induced signaling in vascular cells. Emerging evidence has revealed previously unknown functions for HLA beyond antigen presentation, including association with coreceptors in cis to permit signal transduction, and modulation of intracellular signaling downstream of other receptors that may be relevant to HLA signaling in the graft vasculature. We discuss the literature regarding HLA-induced signaling in vascular endothelial and smooth muscle cells, as well as under endogenous biological conditions, and how such signaling relates to functional changes and pathological mechanisms during graft injury. FAU - Valenzuela, Nicole M AU - Valenzuela NM AD - UCLA Immunogenetics Center, Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, 1000 Veteran Ave Room 1-520, Los Angeles, CA 90095, USA. FAU - Reed, Elaine F AU - Reed EF AD - UCLA Immunogenetics Center, Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, 1000 Veteran Ave Room 1-520, Los Angeles, CA 90095, USA. LA - eng GR - R01 AI042819/AI/NIAID NIH HHS/United States GR - R56 AI042819/AI/NIAID NIH HHS/United States PT - Journal Article DEP - 20150524 PL - Switzerland TA - Curr Transplant Rep JT - Current transplantation reports JID - 101624626 PMC - PMC5365147 MID - NIHMS694151 OTO - NOTNLM OT - Antibody-mediated rejection OT - Endothelial cells OT - HLA antibodies OT - Leukocyte recruitment OT - Mammalian target of rapamycin (mTOR) OT - Signal transduction EDAT- 2015/09/01 00:00 MHDA- 2015/09/01 00:01 PMCR- 2017/03/24 CRDT- 2017/03/28 06:00 PHST- 2017/03/28 06:00 [entrez] PHST- 2015/09/01 00:00 [pubmed] PHST- 2015/09/01 00:01 [medline] PHST- 2017/03/24 00:00 [pmc-release] AID - 10.1007/s40472-015-0065-6 [doi] PST - ppublish SO - Curr Transplant Rep. 2015 Sep;2(3):222-232. doi: 10.1007/s40472-015-0065-6. Epub 2015 May 24.