Diannexin protects against renal ischemia reperfusion injury and targets phosphatidylserines in ischemic tissue
Publication year
2011Source
PLoS One, 6, 8, (2011), article e24276ISSN
Publication type
Article / Letter to editor
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Organization
Pharmacology-Toxicology
Dentistry
Nuclear Medicine
Anesthesiology
Internal Medicine
Journal title
PLoS One
Volume
vol. 6
Issue
iss. 8
Subject
DCN 1: Perception and Action N4i 4: Auto-immunity, transplantation and immunotherapy; N4i 1: Pathogenesis and modulation of inflammation; NCEBP 14: Cardiovascular diseases; NCEBP 14: Cardiovascular diseases NCMLS 5: Membrane transport and intracellular motility; NCMLS 3: Tissue engineering and pathology; NCMLS 5: Membrane transport and intracellular motility IGMD 9: Renal disorderAbstract
Renal ischemia/reperfusion injury (IRI) frequently complicates shock, renal transplantation and cardiac and aortic surgery, and has prognostic significance. The translocation of phosphatidylserines to cell surfaces is an important pro-inflammatory signal for cell-stress after IRI. We hypothesized that shielding of exposed phosphatidylserines by the annexin A5 (ANXA5) homodimer Diannexin protects against renal IRI. Protective effects of Diannexin on the kidney were studied in a mouse model of mild renal IRI. Diannexin treatment before renal IRI decreased proximal tubule damage and leukocyte influx, decreased transcription and expression of renal injury markers Neutrophil Gelatinase Associated Lipocalin and Kidney Injury Molecule-1 and improved renal function. A mouse model of ischemic hind limb exercise was used to assess Diannexin biodistribution and targeting. When comparing its biodistribution and elimination to ANXA5, Diannexin was found to have a distinct distribution pattern and longer blood half-life. Diannexin targeted specifically to the ischemic muscle and its affinity exceeded that of ANXA5. Targeting of both proteins was inhibited by pre-treatment with unlabeled ANXA5, suggesting that Diannexin targets specifically to ischemic tissues via phosphatidylserine-binding. This study emphasizes the importance of phosphatidylserine translocation in the pathophysiology of IRI. We show for the first time that Diannexin protects against renal IRI, making it a promising therapeutic tool to prevent IRI in a clinical setting. Our results indicate that Diannexin is a potential new imaging agent for the study of phosphatidylserine-exposing organs in vivo.
This item appears in the following Collection(s)
- Academic publications [238441]
- Electronic publications [122543]
- Faculty of Medical Sciences [90373]
- Open Access publications [97534]
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