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Updated: Jun 12, 2026
Induction of Ocular Surface Inflammation and Collection of Involved Tissues
Published on: August 4, 2022
Progression of ocular sulfur mustard injury: development of a model system
Denise Milhorn1, Tracey Hamilton, Marian Nelson
1United States Army Medical Research and Materiel Command, Fort Detrick, Maryland, USA.
Abstract:
Exposure of tissues to sulfur mustard (SM) results in the formation of protein and nucleotide adducts that disrupt cellular metabolism and cause cell death. Subsequent pathologies involve a significant proinflammatory response, disrupted healing, and long-term defects in tissue architecture. Following ocular exposure, acute corneal sequelae include epithelial erosions, necrosis, and corneal inflammation. Longer term, a progressive injury becomes distributed throughout the anterior chamber, which ultimately causes a profound remodeling of corneal tissues. In many cases, debilitating and vision-threatening injuries reoccur months to years after the initial exposure. Preliminary data in humans suffering from chronic epithelial lesions suggest that thymosin beta4 (Tbeta4) may be a viable candidate to mitigate acute or long-term ocular SM injury. To evaluate therapeutic candidates, we have developed a rabbit ocular exposure model system. In this paper, we report molecular, histological, ultrastructural, and clinical consequences of rabbit ocular SM injury, which can be used to assess Tbeta4 efficacy, including timepoints at which Tbeta4 will be assessed for therapeutic utility.
Insights
Sulfur mustard (SM) causes severe eye injuries, including vision loss. This study establishes a rabbit model to test thymosin beta4 (Tbeta4) as a potential treatment for these debilitating ocular injuries.
Area of Science:
- Ophthalmology
- Toxicology
- Regenerative Medicine
Background:
- Sulfur mustard (SM) exposure causes cellular damage and inflammation, leading to acute and chronic ocular pathologies.
- These injuries include corneal epithelial defects, inflammation, and long-term tissue remodeling, potentially causing vision loss.
- Recurrent, vision-threatening complications can manifest months or years after initial exposure.
Purpose of the Study:
- To characterize the molecular, histological, ultrastructural, and clinical outcomes of ocular sulfur mustard injury in a rabbit model.
- To establish a preclinical platform for evaluating therapeutic candidates, such as thymosin beta4 (Tbeta4), for ocular SM injury.
- To determine optimal timepoints for assessing Tbeta4 efficacy in mitigating SM-induced ocular damage.
Main Methods:
- Development and utilization of a rabbit ocular exposure model for sulfur mustard (SM).
- Comprehensive assessment of injury using molecular, histological, and ultrastructural analyses.
- Clinical evaluation of ocular sequelae and identification of timepoints for therapeutic intervention.
Main Results:
- The rabbit model effectively replicates key features of human ocular SM injury, including acute and chronic effects.
- Detailed characterization of cellular and tissue-level damage provides a basis for therapeutic assessment.
- Identification of specific time windows for intervention is crucial for evaluating treatment efficacy.
Conclusions:
- The established rabbit ocular SM injury model is suitable for evaluating therapeutic agents like thymosin beta4 (Tbeta4).
- Understanding the temporal progression of SM-induced ocular damage is essential for effective treatment strategies.
- This model will facilitate the development of novel therapies to mitigate the severe consequences of sulfur mustard exposure.
