Web of Science: 7 cites, Scopus: 9 cites, Google Scholar: cites,
Overexpression of Hemopexin in the Diabetic Eye
Hernández Pascual, Cristina (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Garcia-Ramírez, Marta (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Simó Canonge, Rafael (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Universitat Autònoma de Barcelona

Data: 2013
Resum: Hemopexin is a well-recognized permeability factor in the kidney, but its potential role in blood-retinal barrier (BRB) breakdown has not been explored. The main aims of this study were as follows: 1) to determine hemopexin expression in the retina and its content in the vitreous fluid from diabetic patients with diabetic macular edema (DME) and nondiabetic patients, 2) to evaluate the effect of hemopexin on BRB permeability, and 3) to determine whether dexamethasone prevents an eventual hemopexin-induced hyperpermeability. Biological material included 1) retinas from 10 diabetic donors with nonproliferative retinopathy and from 10 nondiabetic donors and 2) vitreous fluid from 14 patients with DME and 14 nondiabetic patients. Hemopexin and hemopexin receptor mRNA levels were measured by quantitative RT-PCR and hemopexin concentrations by ELISA. The effect of hemopexin on permeability in culture was evaluated in human retinal pigment epithelial (ARPE)-19 cells and bovine retinal endothelial cells. The experiments were repeated in the presence of hemopexin-neutralizing antibodies and dexamethasone. A higher expression of hemopexin was detected in the retinal pigment epithelium (RPE) from diabetic patients in comparison with nondiabetic control subjects. Intravitreal hemopexin concentration was higher in patients with DME than in nondiabetic subjects. Hemopexin significantly increased permeability in ARPE-19 cells, which was prevented by both hemopexin-neutralizing antibodies and dexamethasone. Hemopexin is overexpressed in the RPE of diabetic patients with DME and induces the breakdown of RPE cells in vitro. Dexamethasone was able to prevent hemopexin-induced hyperpermeability. Our results suggest that hemopexin can be considered a new pathogenic candidate for DME.
Ajuts: Ministerio de Economía y Competitividad SAF2009-07408
Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-739
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Llengua: Anglès
Document: Article ; recerca ; Versió publicada
Publicat a: Diabetes Care, Vol. 36 (august 2013) , p. 2815-2821, ISSN 1935-5548

DOI: 10.2337/dc12-2634
PMID: 23620477


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