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Related Experiment Videos

Retinoblastoma in a dog

N A Syed1, T M Nork, G L Poulsen

  • 1Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, USA.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|June 1, 1997
PubMed
Summary
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This study describes the first documented case of spontaneous canine retinoblastoma, a retinal tumor in a dog exhibiting characteristics similar to human retinoblastoma. Molecular mechanisms of retinal oncogenesis are also discussed.

Area of Science:

  • Veterinary Pathology
  • Ophthalmology
  • Oncology

Background:

  • Retinoblastoma is a rare malignant tumor of the retina.
  • Spontaneous retinoblastoma has not been previously documented in animals.

Purpose of the Study:

  • To classify a canine retinal tumor with features resembling human retinoblastoma.
  • To explore molecular mechanisms in retinal oncogenesis.

Main Methods:

  • Histological examination of a canine retinal tumor.
  • Immunocytochemical analysis for S-antigen and glial fibrillary acidic protein.
  • Enzyme histochemistry and DNA labeling for cell death analysis.

Main Results:

  • The canine retinal tumor displayed Flexner-Wintersteiner rosettes, characteristic of retinoblastoma.

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  • Tumor cells showed immunoreactivity for S-antigen and glial fibrillary acidic protein.
  • Apoptosis was the primary mode of cell death, with evidence of photoreceptor and glial differentiation.

    • Conclusions:

    • The histopathology and staining characteristics strongly suggest retinoblastoma in this dog.
    • This represents the first reported instance of spontaneous retinoblastoma in an animal.
    • This case provides a model for studying retinoblastoma and retinal oncogenesis.