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Recurrent intraocular inflammation in endotoxin-induced uveitis
A T Kozhich1, C C Chan, I Gery
1National Eye Institute, National Institutes of Health, Bethesda, Maryland, USA.
Investigative Ophthalmology & Visual Science
|June 14, 2000
Summary
Endotoxin injection can cause recurrent intraocular inflammation, with a second, more severe peak observed in susceptible mice. This finding challenges the view of endotoxin-induced uveitis as a monophasic disease.
Area of Science:
- Ophthalmology
- Immunology
- Pathology
Background:
- Endotoxin-induced uveitis (EIU) is typically considered a monophasic condition.
- EIU commonly peaks 24 hours post-endotoxin administration in rodent models.
Purpose of the Study:
- To investigate if endotoxin injection can induce recurrent intraocular inflammation.
- To examine later time points of inflammation in high and moderate EIU-susceptible mouse strains.
Main Methods:
- EIU was induced in C3H/HeN (high susceptibility) and FVB/N (moderate susceptibility) mice via intraperitoneal endotoxin.
- Histological analysis of ocular inflammation was performed by a masked observer from day 1 to day 17 post-injection.
Main Results:
- C3H/HeN mice exhibited a bimodal inflammatory response, with a second, more pronounced peak around day 5, following the initial peak at 24 hours.
- FVB/N mice showed a single inflammatory peak approximately 4 days after endotoxin injection.
- The secondary inflammatory peak in C3H/HeN mice was more severe than the initial response.
Conclusions:
- Endotoxin administration in C3H/HeN mice triggers recurrent intraocular inflammation.
- The previously unrecognized second inflammatory peak is more severe than the initial EIU.
- Investigating this secondary inflammatory phase may elucidate the pathogenesis of recurrent human uveitis.