L-ferritin binding to Scara5: A new iron traffic pathway potentially implicated in retinopathy

Luísa Mendes-Jorge, David Ramos, Andreia Valenҫa, Mariana López-Luppo, Virgínia Maria Rico Pires, Joana Catita, Victor Nacher, Marc Navarro, Ana Carretero, Alfonso Rodriguez-Baeza, Jesús Ruberte

Research output: Contribution to journalArticleResearchpeer-review

26 Citations (Scopus)

Abstract

Iron is essential in the retina because the heme-containing enzyme guanylate cyclase modulates phototransduction in rods and cones. Transferrin endocytosis is the classical pathway for obtaining iron from the blood circulation in the retina. However, the iron storage protein ferritin has been also recently proposed as an iron carrier. In this study, the presence of Scara5 and its binding to L-ferritin was investigated in the retina. Our results showed that Scara5, the specific receptor for Lferritin, was expressed in mouse and human retinas in many cell types, including endothelial cells. Furthermore, we showed that intravenously injected ferritin crossed the blood retinal barrier through L-ferritin binding to Scara5 in endothelial cells. Thus, suggesting the existence of a new pathway for iron delivery and trafficking in the retina. In a murine model of photoreceptor degeneration, Scara5 was downregulated, pointing out this receptor as a potential player implicated in retinopathy and also as a possible therapeutic target.

Original languageEnglish
Article numbere106974
JournalPLoS ONE
Volume9
Issue number9
DOIs
Publication statusPublished - 26 Sep 2014

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