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A Zebrafish Model of Diabetes Mellitus and Metabolic Memory
Published on: February 28, 2013
Dysglycaemia, vasculopenia, and the chronic consequences of diabetes
Hertzel C Gerstein1, Geoff H Werstuck2
1Department of Medicine, McMaster University and Hamilton Health Sciences, Hamilton, ON, Canada; Population Health Research Institute, McMaster University and Hamilton Health Sciences, Hamilton, ON, Canada.
Abstract:
High glucose concentrations are independent risk factors for many serious disorders. Glucose lowering can reduce or prevent many of these disorders. The mechanisms that cause glucose-linked tissue damage are unclear; however, the sequence of tissue changes that lead to one of these consequences (ie, retinopathy) have been understood for decades because the retina can be easily inspected and changes in its vascular supply can easily be assessed. The possibility that the long-term harms of raised glucose concentrations are mediated through reduced capillary perfusion (ie, vasculopenia) is suggested by strong epidemiological links between capillary abnormalities in the retina and most of the complications of diabetes, a delay between the therapeutic effect of glucose lowering in the retina and in other tissues, laboratory evidence that atherosclerosis is promoted by abnormalities in the capillary-rich vasa vasorum of conductance vessels, and similarities in capillary abnormalities in the retina and the kidney of people with diabetes. These findings also suggest that the retina might be a window through which the effect of raised glucose concentrations on a wide range of tissues can be seen. If continuing research lends support to this theory, treatments that counteract the effect of glucose on capillaries such as those in the retina might ultimately also reduce other serious consequences of dysglycaemia.
Insights
High glucose levels damage tissues, potentially through reduced capillary blood flow (vasculopenia). The retina may serve as a key indicator for these widespread effects, offering insights into diabetes complications.
Area of Science:
- Endocrinology
- Ophthalmology
- Vascular Biology
Background:
- High glucose concentrations are established risk factors for numerous severe health disorders.
- Glucose-lowering interventions can mitigate or prevent many of these glucose-linked conditions.
- The precise mechanisms of glucose-induced tissue damage remain incompletely understood.
Purpose of the Study:
- To explore the hypothesis that long-term harms of elevated glucose are mediated by reduced capillary perfusion (vasculopenia).
- To investigate the retina as a potential "window" for observing the systemic effects of hyperglycemia on various tissues.
- To examine the link between retinal vascular abnormalities and broader diabetic complications.
Main Methods:
- Epidemiological analysis of links between retinal capillary abnormalities and diabetes complications.
- Assessment of the temporal relationship between glucose-lowering therapy effects in the retina versus other tissues.
- Review of laboratory evidence on glucose's role in atherosclerosis via vasa vasorum.
- Comparison of capillary abnormalities in the retina and kidney of diabetic individuals.
Main Results:
- Strong epidemiological associations exist between retinal capillary issues and most diabetes complications.
- A delay is observed in the therapeutic impact of glucose lowering on the retina compared to other tissues.
- Laboratory data suggest glucose abnormalities promote atherosclerosis in the vasa vasorum.
- Similarities in retinal and renal capillary abnormalities in diabetic patients were noted.
Conclusions:
- The retina's susceptibility to high glucose may reflect a broader vasculopathic process (vasculopenia) affecting multiple organs.
- The retina could serve as an accessible model for understanding systemic glucose toxicity.
- Further research supporting this theory may lead to treatments targeting capillary protection against hyperglycemia, reducing overall diabetic complications.
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