title: Activated CD47 regulates multiple vascular and stress responses: implications for acute kidney injury and its management.
abstract: Ischemia-reperfusion injury (IRI) remains a significant source of early and delayed renal transplant failure. Therapeutic interventions have yet to resolve this ongoing clinical challenge although the reasons for this remain unclear. The cell surface receptor CD47 is widely expressed on vascular cells and in tissues. It has one known soluble ligand, the stress-released matricellular protein thrombospondin-1 (TSP1). The TSP1-CD47 ligand receptor axis controls a number of important cellular processes, inhibiting survival factors such as nitric oxide, cGMP, cAMP, and VEGF, while activating injurious pathways such as production of reactive oxygen species. A role of CD47 in renal IRI was recently revealed by the finding that the TSP1-CD47 axis is induced in renal tubular epithelial cells (RTEC) under hypoxia and following IRI. The absence of CD47 in knockout mice increases survival, mitigates RTEC damage, and prevents subsequent kidney failure. Conversely, therapeutic blockade of TSP1-CD47 signaling provides these same advantages to wild-type animals. Together, these findings suggest an important role for CD47 in renal IRI as a proximate promoter of injury and as a novel therapeutic target.
authors.affiliation: Vascular Medicine Institute, University of Pittsburgh School of Medicine, 200 Lothrop St., Pittsburgh, PA 15261, USA.
authors.forename: Natasha M
authors.initials: NM
authors.lastname: Rogers
authors.forename: Mingyi
authors.initials: M
authors.lastname: Yao
authors.forename: Enrico M
authors.initials: EM
authors.lastname: Novelli
authors.forename: Angus W
authors.initials: AW
authors.lastname: Thomson
authors.forename: David D
authors.initials: DD
authors.lastname: Roberts
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Isenberg
mesh_terms: D058186:Acute Kidney Injury / Q000378:metabolism* / Q000628:therapy; D000818:Animals; D051928:CD47 Antigen / Q000378:metabolism*; D006801:Humans; D007668:Kidney / Q000378:metabolism*; D051379:Mice; D017382:Reactive Oxygen Species / Q000378:metabolism; D015427:Reperfusion Injury / Q000378:metabolism; D019700:Thrombospondin 1 / Q000378:metabolism*
chemical_list: D051928:CD47 Antigen; D017382:Reactive Oxygen Species; D019700:Thrombospondin 1