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Retinopathy in diabetic hypertensive monkeys: a pathologic study

E R Büchi1, A Kurosawa, M O Tso

  • 1M.O.M. Tso Eye Pathology Laboratory, UIC Eye Center, Chicago, IL 60612, USA.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|June 1, 1996
PubMed
Summary

Diabetic retinopathy in monkeys with hypertension shows stages similar to humans, but lacks vitreous neovascularization. This primate model offers insights into diabetic microangiopathy.

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Area of Science:

  • Ophthalmology
  • Diabetology
  • Primate Models

Background:

  • Developing a primate model for diabetic retinopathy is crucial for research.
  • Previous reports detailed microangiopathic retinopathy in diabetic hypertensive monkeys.
  • This study focuses on the pathological findings in these animal models.

Purpose of the Study:

  • To describe the pathological findings of microangiopathic retinopathy in diabetic monkeys with mild hypertension.
  • To evaluate the utility of this primate model for studying human diabetic retinopathy.

Main Methods:

  • Studied eleven eyes from six monkeys (five rhesus, one cynomolgus) with spontaneous or induced diabetes and hypertension.
  • Employed horseradish peroxidase tracer technique in two monkeys.
  • Utilized light and electron microscopy on trypsin-prepared retinal vasculature.

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Main Results:

  • Characterized microangiopathic retinopathy in three stages: background, exudative, and chronic ischemic.
  • Early stage showed microvascular abnormalities and capillary dropout.
  • Exudative stage featured vascular leakage, hemorrhage, and cotton-wool spots.
  • Chronic stage presented vascular occlusions and retinal atrophy.

Conclusions:

  • Diabetic retinopathy in hypertensive monkeys mirrors human diabetic and hypertensive retinopathy.
  • A key difference observed was the absence of vitreous neovascularization in the primate model.
  • This model provides a valuable platform for understanding diabetic retinopathy pathogenesis.