English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/150423
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Activation of Rac1 and Rhoa preserve corneal endothelial barrier function

AuthorsOrtega, María C.; Santander-García, Diana; Marcos Ramiro, Beatriz ; Barroso, Susana ; Cox, Susan; Jiménez-Alfaro, Ignacio ; Millán, Jaime
KeywordsBarrier function
Osmotic stress
Issue Date4-Oct-2016
CitationInvestigative ophthalmology & visual science 57: 6210- 6222 (2016)
AbstractPURPOSE. The corneal endothelium is responsible for the correct hydration of the corneal stroma. Corneal endothelial cells have a low proliferative capacity, so preserving their barrier function under suboptimal conditions that cause osmotic imbalance, such as those arising from corneal pathologies, age, cryopreservation, and transplantation, is essential for maintaining corneal transparency. We have investigated the signaling induced by hyperosmotic shock that reversibly disrupts corneal endothelial barriers in human endothelial cells and in murine corneas. METHODS. Endothelial barrier properties were analyzed in vitro by electric cell substrate impedance sensing (ECIS) and confocal microscopy of the human endothelial cell line B4G12-HCEC, and, ex vivo, by confocal microscopy and stimulated emission-depletion (STED) superresolution microscopy of murine corneas. Cell signaling in response to hyperosmotic stress, induced with an excess of sodium chloride, was investigated in B4G12-HCECs. Rho GTPase activity was detected by pulldown assays with recombinant GST proteins fused to the Rho binding domains of Rho effectors. RESULTS. Hyperosmotic stress increased actin polymerization and activated the Rho GTPases Rac1 and RhoA, but not Cdc42. Rac1-and RhoA-mediated pathway inhibition had a minor effect on barrier disruption but partially delayed barrier reformation after stress withdrawal. In contrast, Rac1 and RhoA activation enhanced constitutive endothelial barrier function and accelerated barrier repair. CONCLUSIONS. Our results indicate that Rac1 and RhoA activation do not mediate stress-induced cell contraction but are endothelial responses that act to restore and maintain barrier homeostasis. Therefore, pharmacological activation of these two GTPases could be a therapeutic strategy for preserving corneal endothelial barrier function.
Identifiersdoi: 10.1167/iovs.16-20031
issn: 1552-5783
Appears in Collections:(CBM) Artículos
Files in This Item:
File Description SizeFormat 
MillánJ_ActivationOfRac1AndRhoAPreserve.pdf2,36 MBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.