Local ischemia and increased expression of vascular endothelial growth factor following ocular dissemination of mycobacterium tuberculosis

Seema M. Thayil, Thomas A Albini, Hossein Nazari, Andrew A. Moshfeghi, Jean-Marie A Parel, Narsing A. Rao, Petros C. Karakousis

Research output: Contribution to journalArticle

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Abstract

The pathogenesis of intraocular tuberculosis remains poorly understood partly due to the lack of adequate animal models that accurately simulate human disease. Using a recently developed model of ocular tuberculosis following aerosol infection of guinea pigs with Mycobacterium tuberculosis, we studied the microbiological, histological, and clinical features of intraocular tuberculosis infection. Viable tubercle bacilli were cultivated from all eyes by Day 56 after aerosol delivery of ~200 bacilli to guinea pig lungs. Choroidal tuberculous granulomas showed reduced oxygen tension, as evidenced by staining with the hypoxia-specific probe pimonidazole, and expression of vascular endothelial growth factor (VEGF) was detected in the retinal pigment epithelium (RPE) and photoreceptors. Fundoscopic examination of M. tuberculosis-infected guinea pig eyes revealed altered vascular architecture and chorioretinal hemorrhage by Day 56 after infection. This model may be useful in further elucidating the pathogenesis of ocular tuberculosis, as well as in developing tools for diagnosis and assessment of antituberculosis treatment responses in the eye.

Original languageEnglish
Article numbere28383
JournalPLoS One
Volume6
Issue number12
DOIs
StatePublished - Dec 5 2011

Fingerprint

vascular endothelial growth factors
Ocular Tuberculosis
Mycobacterium tuberculosis
ischemia
Vascular Endothelial Growth Factor A
Guinea Pigs
Ischemia
tuberculosis
eyes
Bacilli
Aerosols
Bacillus
guinea pigs
Tuberculosis
Infection
Vertebrate Photoreceptor Cells
aerosols
Retinal Pigments
Retinal Pigment Epithelium
Granuloma

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Local ischemia and increased expression of vascular endothelial growth factor following ocular dissemination of mycobacterium tuberculosis. / Thayil, Seema M.; Albini, Thomas A; Nazari, Hossein; Moshfeghi, Andrew A.; Parel, Jean-Marie A; Rao, Narsing A.; Karakousis, Petros C.

In: PLoS One, Vol. 6, No. 12, e28383, 05.12.2011.

Research output: Contribution to journalArticle

Thayil, Seema M. ; Albini, Thomas A ; Nazari, Hossein ; Moshfeghi, Andrew A. ; Parel, Jean-Marie A ; Rao, Narsing A. ; Karakousis, Petros C. / Local ischemia and increased expression of vascular endothelial growth factor following ocular dissemination of mycobacterium tuberculosis. In: PLoS One. 2011 ; Vol. 6, No. 12.
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