The aldosterone-mineralocorticoid receptor pathway exerts anti-inflammatory effects in endotoxin-induced uveitis.
Details
Serval ID
serval:BIB_7540DC6BC819
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The aldosterone-mineralocorticoid receptor pathway exerts anti-inflammatory effects in endotoxin-induced uveitis.
Journal
Plos One
ISSN
1932-6203 (Electronic)
ISSN-L
1932-6203
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
7
Number
11
Pages
e49036
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Abstract
We have previously shown that the eye is a mineralocorticoid-sensitive organ and we now question the role of mineralocorticoid receptor (MR) in ocular inflammation. The endotoxin-induced uveitis (EIU), a rat model of human intraocular inflammation, was induced by systemic administration of lipopolysaccharide (LPS). Evaluations were made 6 and 24 hours after intraocular injection of aldosterone (simultaneous to LPS injection). Three hours after onset of EIU, the MR and the glucocorticoid metabolizing enzyme 11-beta hydroxysteroid dehydrogenase type 2 (11β-HSD2) expression were down-regulated in iris/ciliary body and the corticosterone concentration was increased in aqueous humor, altering the normal MR/glucocorticoid receptor (GR) balance. At 24 hours, the GR expression was also decreased. In EIU, aldosterone reduced the intensity of clinical inflammation in a dose-dependent manner. The clinical benefit of aldosterone was abrogated in the presence of the MR antagonist (RU26752) and only partially with the GR antagonist (RU38486). Aldosterone reduced the release of inflammatory mediators (6 and 24 hours: TNF-α, IFN-γ, MIP-1α) in aqueous humor and the number of activated microglia/macrophages. Aldosterone partly prevented the uveitis-induced MR down-regulation. These results suggest that MR expression and activation in iris/ciliary body could protect the ocular structures against damages induced by EIU.
Keywords
11-beta-Hydroxysteroid Dehydrogenase Type 2/genetics, 11-beta-Hydroxysteroid Dehydrogenase Type 2/metabolism, Aldosterone/administration & dosage, Aldosterone/pharmacology, Animals, Anti-Inflammatory Agents/metabolism, Anti-Inflammatory Agents/pharmacology, Aqueous Humor/drug effects, Aqueous Humor/metabolism, Chemokines/metabolism, Ciliary Body/enzymology, Ciliary Body/pathology, Down-Regulation/drug effects, Down-Regulation/genetics, Endotoxins, Female, Humans, Inflammation Mediators/metabolism, Intravitreal Injections, Iris/drug effects, Iris/enzymology, Lipopolysaccharides, Microglia/drug effects, Microglia/metabolism, Rats, Rats, Inbred Lew, Receptors, Glucocorticoid/genetics, Receptors, Glucocorticoid/metabolism, Receptors, Mineralocorticoid/genetics, Receptors, Mineralocorticoid/metabolism, Signal Transduction/drug effects, Spironolactone/administration & dosage, Spironolactone/pharmacology, Uveitis/chemically induced, Uveitis/drug therapy
Pubmed
Web of science
Open Access
Yes
Create date
19/08/2013 16:03
Last modification date
20/08/2019 15:32