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Platelets, vascular disease, and diabetes mellitus
1Department of Pathology, McMaster University, Hamilton, ON, Canada.
Canadian Journal of Physiology and Pharmacology
|March 1, 1994
Summary
Diabetic platelets show increased hypersensitivity to agonists, contributing to enhanced atherosclerosis. These platelet changes may explain the higher risk of blood clots and vascular disease in diabetes.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Hematology
Background:
- Diabetes mellitus significantly elevates the risk of atherosclerosis and associated thromboembolic events.
- Platelets play a crucial role in atherosclerosis by releasing substances that interact with injured blood vessels.
Purpose of the Study:
- To investigate the mechanisms by which platelets contribute to enhanced atherosclerosis in diabetes.
- To explore platelet hypersensitivity and activation alterations in diabetic patients.
Main Methods:
- In vitro studies assessing platelet sensitivity to agonists.
- Analysis of platelet surface receptors, membrane fluidity, and intracellular signaling pathways.
- Review of in vivo and animal studies on platelet activity in diabetes.
Main Results:
- Diabetic platelets exhibit hypersensitivity to agonists, linked to increased glycoprotein receptors and fibrinogen binding.
- Enhanced arachidonate pathway activation and increased thromboxane A2 formation were observed.
- Alterations in phosphoinositide turnover, calcium mobilization, and protein phosphorylation indicate heightened platelet activation.
Conclusions:
- Diabetic platelet hypersensitivity and altered activation mechanisms contribute to accelerated atherosclerosis.
- These platelet changes are potential drivers of increased cardiovascular complications in diabetes.
- Further in vivo research is needed to fully elucidate the role of platelet activity in diabetic vascular disease.