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Platelet membrane and calcium control abnormalities in essential hypertension
1Department of Research, University Hospital, Basel, Switzerland.
Insights
This study explores how cellular calcium metabolism dysfunction contributes to hypertension. Platelets, used as a model, show altered calcium processes linked to essential hypertension, suggesting a fundamental membrane defect.
Area of Science:
- Biochemistry
- Physiology
- Pathogenesis of Hypertension
Background:
- Intracellular calcium concentration is crucial for cellular function.
- Dysregulation of calcium homeostasis is implicated in hypertension.
- Platelets share physiological similarities with vascular smooth muscle cells.
Purpose of the Study:
- To investigate the role of calcium (Ca2+) in hypertension disorders.
- To examine Ca2+-linked platelet processes altered in essential hypertension.
- To propose a fundamental membrane lesion as the basis for these aberrations.
Main Methods:
- Review of calcium homeostasis mechanisms.
- Utilizing platelets as a cellular model.
- Analysis of Ca2+-linked platelet processes.
Main Results:
- Platelets exhibit altered calcium-dependent processes in essential hypertension.
- These alterations suggest a link between calcium metabolism and hypertension pathogenesis.
- A fundamental membrane defect is proposed to underlie these changes.
Conclusions:
- Cellular calcium metabolism dysfunction plays a role in hypertension.
- Platelet Ca2+ abnormalities are relevant to understanding hypertension.
- A unifying membrane lesion may explain altered calcium handling in hypertension.
Abstract:
The mechanisms whereby intracellular calcium concentration is controlled are briefly reviewed. With the current knowledge of both calcium homeostasis and the function and properties of cellular Ca2+-target proteins/signal transduction systems, a dysfunction of cellular calcium metabolism is considered in relation to the pathogenesis of hypertension. Although the enhanced peripheral vascular resistance characteristic of hypertension is ultimately a function of Ca2+ availability for smooth muscle cell contraction, the platelet possesses many parallel biochemical and physiologic properties. Therefore, we have utilized the platelet as the cell model for investigating the role of Ca2+ in hypertension disorders. An overview of Ca2+-linked platelet processes altered in essential hypertension is presented, and an attempt is made to integrate these multiple aberrations in a fundamental membrane lesion.