February 1996
Volume 37, Issue 2
Free
Articles  |   February 1996
Trilateral tumors in four different lines of transgenic mice expressing SV40 T-antigen.
Author Affiliations
  • D M Marcus
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • J G Lasudry
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • J L Carpenter
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • J Windle
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • K A Howes
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • M R al-Ubaidi
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • W Baehr
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • P A Overbeek
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • R L Font
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
  • D M Albert
    Department of Ophthalmology, Medical College of Georgia, Augusta 30912, USA.
Investigative Ophthalmology & Visual Science February 1996, Vol.37, 392-396. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      D M Marcus, J G Lasudry, J L Carpenter, J Windle, K A Howes, M R al-Ubaidi, W Baehr, P A Overbeek, R L Font, D M Albert; Trilateral tumors in four different lines of transgenic mice expressing SV40 T-antigen.. Invest. Ophthalmol. Vis. Sci. 1996;37(2):392-396.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

PURPOSE: A line of transgenic mice containing the simian virus (SV) 40 T-antigen (T-ag) gene driven by the beta-luteinizing hormone (BLH) promoter developed bilateral retinoblastoma and primitive neuroectodermal tumors (PNET) of the midbrain. Midbrain tumors arose from the subependymal layer of the cerebral aqueduct. Bilateral ocular and brain tumors ("trilateral") were found in three other SV40 T-ag transgenic murine lines containing different promoters (murine interphotoreceptor retinoid-binding protein (IRBP), human IRBP, and alpha A-crystallin). To gain insight into the regulatory mechanisms involved in central nervous system tumorigenesis, the authors examined brain tumors from four lines of SV40 T-ag mice with different promoters. METHODS: Formalin-fixed brain tumors were examined from four lines of transgenic mice containing different promoters linked to the protein coding region of the enhancerless SV40 T-ag oncogene. Transgenes contained the following promoters: BLH, mouse 1.8-kb IRBP, human 1.3-kb IRBP, and alpha A-crystallin. RESULTS: Mice with a 1.8-kb IRBP promoter develop retinal photoreceptor and pineal tumors. Intracranial tumors arising from the subependymal layer of the third ventricle also were observed. Mice with a 1.3-kb IRBP promoter exhibit bilateral retinal PNET and PNET originating from the subependymal layer of the third ventricle. Mice with the alpha A-crystallin promoter exhibit bilateral lens tumors and PNET of the midbrain. CONCLUSIONS: Ocular tumors in these mice may be ascribed to the promoter-driven, tissue-specific expression of SV40 T-ag. The common finding of PNET arising from the subependymal layer of the diencephalon is unlikely to be promoter related. These findings indicate that a regulatory region specific to the subependymal layer of the cerebral aqueduct and third ventricle resides in the structural region of the SV40 T-ag gene.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×