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Hyperosmolar saline is a proinflammatory stress on the mouse ocular surface
Lihui Luo1, De-Quan Li, Rosa M Corrales
1Ocular Surface Center, Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, TX 77030, USA.
Eye & Contact Lens
|September 16, 2005
Summary
Hyperosmolar stress on the mouse ocular surface increases inflammatory mediators like IL-1beta and TNF-alpha. This stress also activates key signaling pathways (MAPK), suggesting a role in dry eye inflammation.
Area of Science:
- Ophthalmology
- Molecular Biology
- Immunology
Background:
- Dry eye disease is a prevalent condition often associated with ocular surface inflammation.
- Hyperosmolarity of the tear film is a significant factor contributing to dry eye symptoms and pathology.
- Understanding the molecular mechanisms underlying hyperosmolarity-induced inflammation is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effect of hyperosmolar stress on the production of inflammatory mediators on the mouse ocular surface.
- To determine if hyperosmolar stress activates mitogen-activated protein kinase (MAPK) signaling pathways, including JNK, ERK, and p38.
- To elucidate the role of these molecular events in the context of ocular surface inflammation.
Main Methods:
- Mice were exposed to hyperosmotic saline solution (HOSS) or balanced salt solution (BSS) for 2 days.
- Tear fluid and ocular surface tissues (corneal and conjunctival epithelia) were collected for analysis.
- Levels of inflammatory mediators (IL-1beta, TNF-alpha), gelatinase activity, and MAPK activation were measured using ELISA, zymography, Western blot, and RT-PCR.
Main Results:
- HOSS significantly increased IL-1beta and TNF-alpha concentrations in tear fluid and ocular tissues compared to controls.
- Gelatinolytic activity and the expression of IL-1beta, TNF-alpha, and MMP-9 mRNA were notably elevated in HOSS-treated mice.
- Activation of JNK, ERK, and p38 MAPK signaling pathways was markedly increased in the ocular surface epithelia of HOSS-treated mice.
Conclusions:
- Hyperosmolar stress stimulates the production of key inflammatory mediators (IL-1beta, TNF-alpha) and MMP-9 on the mouse ocular surface.
- Hyperosmolarity activates the JNK, ERK, and p38 MAPK signaling pathways in ocular surface tissues.
- These findings support the hypothesis that hyperosmolar stress contributes to ocular surface inflammation, as observed in dry eye conditions.