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Related Experiment Video

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Modeling Tuberculosis in Mycobacterium marinum Infected Adult Zebrafish
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A zebrafish model for ocular tuberculosis.

Kevin Takaki1, Lalita Ramakrishnan1, Soumyava Basu2

  • 1Molecular Immunity Unit, Department of Medicine, MRC Laboratory of Molecular Biology, University of Cambridge, Cambridge, United Kingdom.

Plos One
|March 28, 2018
PubMed
Summary
This summary is machine-generated.

Ocular tuberculosis (TB) can cause severe vision loss. This study uses zebrafish to model ocular TB, revealing how bacteria reach the eye and form early inflammatory granulomas, even with a functional blood retinal barrier.

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Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Immunology

Background:

  • Ocular tuberculosis (TB) is a significant cause of vision loss in endemic regions.
  • The precise mechanisms of ocular TB establishment remain unclear.
  • Understanding early disease development is crucial for effective treatment.

Purpose of the Study:

  • To investigate the early pathogenesis of ocular tuberculosis.
  • To utilize a zebrafish model for studying ocular TB mechanisms.
  • To elucidate how tuberculous infection seeds the eye and initiates inflammation.

Main Methods:

  • Development of a zebrafish larva model infected with Mycobacterium marinum.
  • Observation of bacterial seeding and granuloma formation in the eye.
  • Analysis of the blood retinal barrier integrity and immune cell recruitment.

Main Results:

  • Hematogenous bacterial seeding of the eye occurs despite a functional blood retinal barrier.
  • Early granulomas form in the eye, involving retinal vasculature and the RPE-choroid complex.
  • Peripheral blood monocytes are recruited to ocular granulomas, breaching immune privilege.

Conclusions:

  • The zebrafish model effectively recapitulates key aspects of early ocular TB pathogenesis.
  • Ocular TB involves bacterial seeding and granuloma formation in specific ocular tissues.
  • Immune privilege of the eye is overcome during tuberculous infection through monocyte recruitment.