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A rabbit model for human cytomegalovirus-induced chorioretinal disease
E C Dunkel1, D de Freitas, D I Scheer
1Schepens Eye Research Institute, Department of Ophthalmology, Boston, MA 02114.
Abstract:
AD169, a well-characterized laboratory strain of human cytomegalovirus (HCMV), was used to establish an animal model of progressive HCMV chorioretinal disease by injection of 10(5) pfu into the rabbit vitreous. Chorioretinal, vitreous, and pulmonary disease were monitored by HCMV recovery, clinical observation, antigen localization, and histopathology. Vitritis and focal areas of immune cellular infiltrates were seen in inner retinal layers on days 2-4 after inoculation. Disease progressed with more severe vitritis and to involve the outer retinal layers in areas of mixed monocytic cellular infiltrates, retinal destruction, choroidal edema, and congestion. HCMV was recovered from chorioretinal cell sonicate cultures in titers ranging from 10(4) to 10(5) pfu during peak disease, and HCMV antigens were detected focally by immunofluorescence in retinal layers on days 2 and 4 after inoculation. A rabbit model of HCMV chorioretinitis similar to human CMV disease allows investigation of HCMV pathogenesis and new antiviral therapies and evaluation of immune system modulation of the HCMV ocular infection.
Insights
Researchers developed a rabbit model for human cytomegalovirus (HCMV) chorioretinitis. This model mimics progressive ocular disease, aiding in studying HCMV pathogenesis and testing antiviral therapies.
Area of Science:
- Ophthalmology
- Virology
- Immunology
Background:
- Human cytomegalovirus (HCMV) causes significant ocular disease, particularly in immunocompromised individuals.
- Current understanding of HCMV ocular pathogenesis and effective treatment strategies is limited.
- There is a need for robust animal models to study HCMV chorioretinitis.
Purpose of the Study:
- To establish a novel rabbit model of progressive human cytomegalovirus (HCMV) chorioretinal disease.
- To investigate the pathogenesis of HCMV ocular infection in an animal model.
- To provide a platform for evaluating new antiviral therapies and immune modulation strategies for HCMV eye infections.
Main Methods:
- Injection of 10(5) plaque-forming units (pfu) of the AD169 HCMV strain into the rabbit vitreous.
- Monitoring disease progression through HCMV recovery, clinical observation, antigen localization via immunofluorescence, and histopathology.
- Analysis of chorioretinal, vitreous, and pulmonary tissues.
Main Results:
- Progressive chorioretinal disease characterized by vitritis and retinal inflammation was successfully established.
- Histopathology revealed immune cellular infiltrates, retinal destruction, and choroidal edema.
- HCMV was consistently recovered from ocular tissues, and viral antigens were detected in retinal layers.
Conclusions:
- The developed rabbit model accurately replicates key features of human HCMV chorioretinitis.
- This model serves as a valuable tool for elucidating HCMV ocular disease mechanisms.
- It facilitates the preclinical evaluation of novel antiviral agents and immunomodulatory approaches for HCMV-induced eye infections.
