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[Free calcium in platelets and the serum in essential hypertension]
Insights
Essential hypertension is linked to higher platelet intracellular calcium levels. This finding suggests intracellular calcium plays a role in blood pressure regulation and may aid hypertension prevention and treatment.
Area of Science:
- Cardiovascular physiology
- Cellular biology
- Biochemistry
Context:
- Essential hypertension is a widespread cardiovascular condition.
- Platelets are accessible cells for studying intracellular calcium dynamics.
- Elevated blood pressure poses significant health risks.
Purpose:
- To investigate the role of intracellular free calcium in platelets of patients with essential hypertension.
- To determine the correlation between intracellular free calcium, serum free calcium, and blood pressure.
- To explore the potential of platelet intracellular calcium as a biomarker for hypertension.
Summary:
- Intracellular free calcium levels in platelets were significantly elevated in hypertensive patients compared to normotensive controls.
- A strong positive correlation was observed between platelet intracellular free calcium and blood pressure.
- Serum free calcium levels did not differ between groups, but showed a correlation with blood pressure.
Impact:
- Findings suggest intracellular free calcium is involved in blood pressure regulation.
- Platelet intracellular calcium may serve as a valuable indicator for hypertension management.
- This research opens avenues for novel therapeutic strategies targeting calcium signaling in hypertension.
Abstract:
Intracellular free calcium of platelets was studied in 45 patients with essential hypertension and in 6 patient's normotensive offspring. Intracellular free calcium of platelets in hypertensive patients was significantly higher than those in normotensive subjects (223 +/- 26 vs 170 +/- 28 nmol/lL, P less than 0.001). There was a positive correlation between intracellular free calcium of platelets and blood pressure (r = 0.653 approximately 0.729, P less than 0.001). No increase of intracellular free calcium of platelets was found in patient's normotensive offspring. 33 patients also had serum free calcium measured simultaneously. There was no difference between patients and the normotensive control (1.10 +/- 0.15 vs 1.09 +/- 0.10 mmol/L, P greater than 0.05). However, a positive correlation between serum free calcium and blood pressure (r = 0.363, P less than 0.05) and a weak positive correlation between serum free calcium and intracellular free calcium of platelets (r = 0.337, r 0.05 = 0.344) were found. These results indicated that intracellular free calcium was involved in the regulation of blood pressure, it was postulated that the intracellular free calcium of smooth muscle cell in the peripheral arteriole with resistance might have the similar changes seen in platelets. The changes of intracellular free calcium of platelets might be valuable in the prevention and treatment of hypertension and its vascular complications.