Sjögren's syndrome associated dry eye in a mouse model is ameliorated by topical application of integrin α4 antagonist GW559090.

Abstract

Sjögren's syndrome is an autoimmune disease associated with inflammation of exocrine glands with clinical manifestations of dry eye and dry mouth. Dry eye in this disease involves inflammation of the ocular surface tissues - cornea and conjunctiva. While systemic blockade of adhesion molecules has been used to treat autoimmune diseases, the purpose of this study was to determine the therapeutic efficacy of topical application of an integrin α4 adhesion molecule antagonist in a mouse model of dry eye associated with Sjögren's syndrome. To assess this spontaneously developed ocular surface inflammation related to Sjögren's syndrome in TSP-1null mice (12 wks) was evaluated. Mice were treated with topical formulations containing 0.1% dexamethasone or 30 mg/ml GW559090 or vehicle control. Corneal fluorescein staining and conjunctival goblet cell density were assessed. Real-time PCR analysis was performed to assess expression of the inflammatory marker IL-1β in the cornea and Tbet and RORγt in the draining lymph nodes. Ocular surface inflammation was detectable in TSP-1null mice (≥12 wk old), which resulted in increased corneal fluorescein staining indicative of corneal barrier disruption and reduced conjunctival goblet cell density. These changes were accompanied by increased corneal expression of IL-1β as compared to WT controls and an altered balance of Th1 (Tbet) and Th17 (RORγt) markers in the draining lymph nodes. Topically applied dexamethasone and GW559090 significantly reduced corneal fluorescein staining compared to vehicle treatment (p = 0.023 and p < 0.001, respectively). This improved corneal barrier integrity upon adhesion molecule blockade was consistent with significantly reduced corneal expression of pro-inflammatory IL-1β compared to vehicle treated groups (p < 0.05 for both treatments). Significant improvement in goblet cell density was also noted in mice treated with 0.1% dexamethasone and GW559090 (p < 0.05 for both). We conclude that similar to topical dexamethasone, topically administered GW559090 successfully improved corneal barrier integrity and inflammation in an established ocular surface disease associated with Sjögren's syndrome.

• Authors: Laura Contreras-Ruiz, Fayaz A Mir, Bruce Turpie, Achim H Krauss, Sharmila Masli
• Journal: Experimental eye research (Exp Eye Res) Vol. 143 Pg. 1-8 (Feb 2016) ISSN: 1096-0007 [Electronic] England
• PMID: 26463157 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 Elsevier Ltd. All rights reserved.

Chemical References

• GW559090
• Glucocorticoids
• Integrin alpha4beta1
• Interleukin-1beta
• Nuclear Receptor Subfamily 1, Group F, Member 3
• Ophthalmic Solutions
• Piperidines
• RNA, Messenger
• Thrombospondin 1
• Phenylalanine
• Dexamethasone
• Fluorescein

Topics

• Administration, Topical
• Animals
• Cell Count
• Dexamethasone (therapeutic use)
• Disease Models, Animal
• Dry Eye Syndromes (genetics, pathology, prevention & control)
• Fluorescein (metabolism)
• Glucocorticoids (therapeutic use)
• Goblet Cells (pathology)
• Integrin alpha4beta1 (antagonists & inhibitors)
• Interleukin-1beta (genetics)
• Mice
• Mice, Inbred C57BL
• Nuclear Receptor Subfamily 1, Group F, Member 3 (genetics)
• Ophthalmic Solutions
• Phenylalanine (administration & dosage, analogs & derivatives, therapeutic use)
• Piperidines (administration & dosage, therapeutic use)
• RNA, Messenger (genetics)
• Real-Time Polymerase Chain Reaction
• Sjogren's Syndrome (genetics, pathology, prevention & control)
• Staining and Labeling
• Thrombospondin 1 (deficiency)