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Complement-induced retinal arteriolar occlusions in the cat
J C Lai1, M W Johnson, C L Martonyi
1W.K. Kellogg Eye Center, Department of Ophthalmology, University of Michigan School of Medicine, Ann Arbor, USA.
Retina (Philadelphia, Pa.)
|January 1, 1997
Summary
Complement activation in cats causes temporary retinal arteriolar occlusions. This model may mimic mild Purtscher's retinopathy, but additional factors are needed for ischemic retinal infarcts.
Area of Science:
- Ophthalmology
- Vascular Biology
- Immunology
Background:
- Purtscher's retinopathy is a rare condition causing vision loss.
- The exact cause of Purtscher's retinopathy is unknown, but complement system activation is suspected.
- Developing an animal model is crucial for understanding the pathogenesis of this condition.
Purpose of the Study:
- To create an animal model of complement-induced retinal vasculopathy.
- To investigate if this model resembles Purtscher's retinopathy.
Main Methods:
- Intravascular complement activation was induced in cats using cobra venom factor.
- Retinal blood flow was monitored using fluorescein angioscopy and angiography.
Main Results:
- All animals developed transient retinal arteriolar occlusions after cobra venom factor injection.
- Fluorescein angiography revealed temporary capillary nonperfusion.
- No Purtscher's-like ischemic retinal infarcts were observed.
- Histopathology suggested potential granulocyte aggregates as the cause of occlusion.
Conclusions:
- Complement activation in cats causes transient microembolic retinal arteriolar occlusions.
- This model may represent a mild form of Purtscher's retinopathy.
- Factors beyond complement activation are likely required for ischemic retinal infarcts.