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Experimental ocular tuberculosis in guinea pigs.

Narsing A Rao¹, Thomas A Albini, Mirnalini Kumaradas

¹Doheny Eye Institute and Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.

Archives of Ophthalmology (Chicago, Ill. : 1960)

|September 16, 2009

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A guinea pig model successfully replicates intraocular tuberculosis (TB) by aerosolizing Mycobacterium tuberculosis, showing extrapulmonary spread to the eye. This model aids in understanding ocular TB pathogenesis and developing new treatments.

Area of Science:

Ophthalmology
Infectious Diseases
Microbiology

Background:

Ocular tuberculosis (TB) is a significant cause of vision loss globally.
Developing effective animal models is crucial for studying TB pathogenesis and treatment.

Purpose of the Study:

To establish a guinea pig model of intraocular tuberculosis (TB) that mimics human disease, including pulmonary and extrapulmonary dissemination to the eye.
To evaluate the efficacy of first-line anti-TB drugs in this model.

Main Methods:

Hartley strain guinea pigs were infected with Mycobacterium tuberculosis via aerosol.
Groups included untreated animals and those treated with isoniazid, rifampin, and pyrazinamide.
Ocular TB development was assessed using histology, acid-fast staining, and PCR for M. tuberculosis DNA.

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Main Results:

Untreated guinea pigs developed pulmonary and extrapulmonary TB, with 42% exhibiting ocular TB (uveal involvement).
Ocular lesions in untreated animals contained acid-fast organisms and M. tuberculosis DNA.
Treated animals showed no acid-fast organisms in the eyes, though mild uveitis was observed.

Conclusions:

Aerosolized Mycobacterium tuberculosis infection in guinea pigs effectively models extrapulmonary dissemination to the eye.
The model exhibits key features of human ocular TB, including granulomatous inflammation and the presence of acid-fast bacilli.
This guinea pig model offers valuable insights into ocular TB pathogenesis and can facilitate the development of novel therapeutic strategies.