May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Expression of TNF- and VEGF in the Retina of Three Different Rat Models of Experimental Diabetes
Author Affiliations & Notes
  • J. E. Gallo
    Ophthalmology, Hospital Universitario Austral, Pilar, Argentina
  • J. E. Mancini
    Ophthalmology, Hospital Universitario Austral, Pilar, Argentina
  • J. C. Basabe
    Hospital Municipal "Ricardo Gutierrez", Centro de Investigaciones Endocrinologicas, Buenos Aires, Argentina
  • J. O. Croxatto
    Ocular Pathology, Fundación Oftalmologica Argentina "Jorge Malbran", Buenos Aires, Argentina
  • Footnotes
    Commercial Relationships  J.E. Gallo, None; J.E. Mancini, None; J.C. Basabe, None; J.O. Croxatto, None.
  • Footnotes
    Support  Austral University Grants
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 1338. doi:https://doi.org/
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      J. E. Gallo, J. E. Mancini, J. C. Basabe, J. O. Croxatto; Expression of TNF- and VEGF in the Retina of Three Different Rat Models of Experimental Diabetes. Invest. Ophthalmol. Vis. Sci. 2008;49(13):1338. doi: https://doi.org/.

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

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Abstract

Purpose: : to compare the immunohistochemical expression of TNF-α and VEGF peptides in the retina of three rat models of experimental diabetes.

Methods: : Type 2 diabetes models were constituted by two groups of four male Wistar neonatal rats that received an intraperitoneal injection of 90 mg/kg and 45 mg/kg streptozotocin (SZT) at day 2 of life, respectively. Rats with lower doses of STZ were fed by a high fat diet (HFD) from week 8 onwards. Type 1 model was made up of adult male rats treated with an intraperitoneal injection of 45 mg/kg STZ. All animals, including control non-diabetic group, were sacrificied at 37 weeks of diabetes. Retinas were processed and analysed by immunohistochemical techniques using antibodies against TNF-α and VEGF peptides.

Results: : TNF-α and VEGF peptides expression were higher in diabetic animals than in controls. All diabetics had a positive immunoreactivity of TNF-α in the fiber layer, while type 1 and type 2 diabetic rats without HFD also showed immunoreactivity in the outer plexiform layer and in the RPE. VEGF expression was observed in the fiber layer of all diabetic animals and in the inner plexiform layer of Type 1 and Type 2 diabetic rats with HFD.

Conclusions: : Differences in the expression of these peptides involved in inflammation and ischemia may contribute to better understand the mechanisms of diabetic retinopathy in type 1 and type 2 diabetes.

Keywords: diabetes • diabetic retinopathy • ischemia 
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