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The cellular and molecular mechanisms of diabetic complications
1Vascular Cell Biology Section, Joslin Diabetes Research Center, Boston, Massachusetts, USA.
Abstract:
In this article, the cellular and molecular mechanisms of diabetic complications have been reviewed. Hyperglycemia-induced mechanisms that may induce vascular dysfunction in specific sites of diabetic microvascular damage include increased polyol pathway flux, altered cellular redox state, increased formation of diacylglycerol and the subsequent activation of specific PKC isoforms, and accelerated nonenzymatic formation of advanced glycation endproducts. Several of these mechanisms may be responsible for the potentially damaging overproduction of reactive oxygen species observed with hyperglycemia. Each of these mechanisms may contribute to the known pathophysiologic features of diabetic complications by a number of mechanisms, including the upregulation of cytokines and growth factors. Diabetic macrovascular disease may arise more from insulin resistance than from hyperglycemia, and the authors speculate that this may reflect a selective loss of insulin-dependent vascular homeostasis.
Insights
This review details how high blood sugar (hyperglycemia) causes diabetic complications through cellular and molecular pathways. It also explores how insulin resistance, not just hyperglycemia, may drive diabetic macrovascular disease.
Area of Science:
- Endocrinology
- Molecular Biology
- Pathophysiology
Background:
- Diabetic complications significantly impact patient health and quality of life.
- Understanding the underlying cellular and molecular mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- To review the cellular and molecular mechanisms driving diabetic complications.
- To differentiate mechanisms contributing to microvascular versus macrovascular damage.
Main Methods:
- Literature review of studies on hyperglycemia-induced pathways.
- Analysis of mechanisms related to vascular dysfunction in diabetes.
- Exploration of the role of insulin resistance in macrovascular disease.
Main Results:
- Hyperglycemia triggers pathways like polyol flux, altered redox state, PKC activation, and advanced glycation end-product formation, leading to vascular dysfunction.
- These mechanisms contribute to reactive oxygen species overproduction and cytokine upregulation.
- Insulin resistance, rather than hyperglycemia, is suggested as the primary driver of diabetic macrovascular disease.
Conclusions:
- Multiple hyperglycemia-induced cellular and molecular pathways contribute to diabetic microvascular complications.
- Insulin resistance may play a distinct and significant role in the development of diabetic macrovascular disease.