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Published on: December 18, 2012
[A rabbit model for human cytomegalovirus retinitis]
Y Matsuda1, E Sakurai, H Ozeki
1Department of Ophthalmology, Nagoya City University Medical School, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan.
Purpose:
To develop a rabbit model for human cytomegalovirus(HCMV) retinitis.
Methods:
0.1 ml of 1 x 10(6) plaque forming units/ml HCMV was injected into the vitreous cavity of 10 pigmented rabbit eyes. The eyes were examined ophthalmoscopically on days 1, 2, 3, 4 and 7 and once a week thereafter until 4 weeks after inoculation. Vitreal and retinal findings were graded from 0+ to 4+ on a scale of increasing severity. In addition, we examined the enucleated eyes 3 weeks after HCMV inoculation by histological and immunohistochemical techniques.
Results:
All injected eyes developed vitreoretinal lesions. Vitreous opacities appeared the next day and increased until 4 days after HCMV inoculation. Whitish retinal exudates occurred on day 3 and increased until 3 weeks after HCMV inoculation. Vitreoretinal lesions then disappeared by 4 weeks after inoculation. Histological examination revealed intraretinal infiltration of inflammatory cells and disorganization of the inner retinal architecture. HCMV antigens were detected inside the retina by immunofluorescence using anti early protein antibody against HCMV.
Conclusions:
The results indicate that this rabbit model can be useful to develop and evaluate a new treatment modality for cytomegalovirus retinitis.
Insights
A new rabbit model for human cytomegalovirus (HCMV) retinitis was developed. This model demonstrated vitreoretinal lesions and HCMV antigen presence, proving useful for evaluating new treatments.
Area of Science:
- Ophthalmology
- Virology
- Animal Models
Context:
- Human cytomegalovirus (HCMV) is a significant cause of retinitis in immunocompromised individuals.
- Current treatment options for HCMV retinitis require further development and evaluation.
- Animal models are crucial for studying viral diseases and testing therapeutic interventions.
Purpose:
- To establish a reproducible rabbit model for studying human cytomegalovirus (HCMV) retinitis.
- To characterize the clinical, histological, and immunological features of HCMV-induced retinitis in rabbits.
Summary:
- Intravitreal injection of HCMV in pigmented rabbits induced progressive vitreoretinal lesions, including vitreous opacities and retinal exudates.
- Histological analysis confirmed intraretinal inflammation and disorganization, while immunohistochemistry detected HCMV antigens in the retina.
- The induced lesions resolved by four weeks post-inoculation.
Impact:
- This validated rabbit model provides a valuable platform for preclinical research on HCMV retinitis.
- It will facilitate the development and assessment of novel therapeutic strategies for cytomegalovirus retinitis.
