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Pathogenesis of diabetic retinopathy
1Department of Ophthalmology, University of Wisconsin, Madison 53706.
Abstract:
Diabetic retinopathy involves anatomic changes in retinal vessels and neuroglia. The pathogenetic mechanism responsible for retinopathy is imperfectly understood, but much of the mechanism is apparently reproduced by experimental diabetes in animals and by chronic elevation of blood galactose in nondiabetic animals. The evidence that retinopathy is a consequence of excessive blood sugars and their sequelae is consistent with a demonstrated inhibition of retinopathy by strict glycemic control in diabetic dogs. However, retinopathy in the dog model has shown a tendency to resist intervention by strict control. Biochemical and pathophysiological sequelae of hyperglycemia possibly critical to the development of retinopathy in humans and animal models are being studied in many laboratories. Retinopathy occurs in experimental galactosemia in the absence of the renal hypertrophy, mesangial expansion, and glomerular obliteration typical of diabetes in humans and dogs, implying that retinopathy and nephropathy differ appreciably in pathogenesis.
Insights
Diabetic retinopathy involves retinal changes. While high blood sugar is implicated, strict glycemic control shows limited success in animal models, suggesting complex pathogenesis.
Area of Science:
- Ophthalmology
- Endocrinology
- Pathophysiology
Background:
- Diabetic retinopathy (DR) is characterized by anatomical changes in retinal vessels and neuroglia.
- The precise pathogenetic mechanisms underlying DR remain incompletely understood.
- Experimental diabetes and chronic galactose elevation in animals partially replicate human DR.
Purpose of the Study:
- To investigate the pathogenetic mechanisms of diabetic retinopathy.
- To evaluate the efficacy of strict glycemic control in preventing or inhibiting retinopathy.
- To explore the relationship between retinopathy and nephropathy in different models.
Main Methods:
- Induction of experimental diabetes and chronic galactosemia in animal models.
- Assessment of anatomical changes in retinal vessels and neuroglia.
- Evaluation of the impact of strict glycemic control on retinopathy development.
Main Results:
- Retinopathy occurs in experimental diabetes and galactosemia.
- Strict glycemic control demonstrated inhibition of retinopathy in diabetic dogs, but with resistance to intervention.
- Retinopathy in experimental galactosemia occurs without the typical diabetic nephropathy features.
Conclusions:
- Hyperglycemia and its sequelae are strongly implicated in diabetic retinopathy pathogenesis.
- While glycemic control shows promise, retinopathy development can be complex and resistant to intervention.
- Retinopathy and nephropathy appear to have distinct pathogenetic pathways.