High sodium intake increases platelet aggregation in normal females

Area of Science:

• Cardiovascular Science
• Hematology
• Nutrition Science

Background:

• Platelet activation and aggregation are crucial in vascular disease development.
• Dietary factors, such as sodium intake, may influence platelet function.
• Serotonin plays a role in platelet aggregation and vascular tone.

Purpose of the Study:

• To investigate the impact of varying sodium intake on platelet aggregation and plasma serotonin levels in normal females.
• To explore the correlation between sodium status, serotonin concentration, and platelet aggregation.
• To assess the effect of ketanserin and saralasin on platelet aggregation during high sodium intake.

Main Methods:

• 12 healthy female volunteers consumed diets with 10 or 200 mmol/day sodium for 5 days.
• Platelet-rich plasma (PRP) was incubated with adenosine diphosphate (ADP) to induce aggregation.
• PRP was pre-incubated with ketanserin or saralasin to evaluate their effects on aggregation.

Main Results:

• High sodium intake significantly increased platelet aggregation induced by ADP.
• Salt-loading led to a significant decrease in plasma serotonin concentration.
• A significant negative correlation was observed between serotonin levels and ADP-induced platelet aggregation.
• Ketanserin reduced platelet aggregation during high sodium intake, while saralasin had no effect on aggregation.

Conclusions:

• High sodium intake enhances in vitro platelet aggregation in normal females, an effect partially mitigated by ketanserin.
• Changes in sodium status significantly alter platelet count and plasma serotonin levels.
• Platelet aggregation is inversely proportional to plasma serotonin concentration in this cohort.