Objective: To explore the effect of strontium in drinking water on blood pressure in hypertensive mice and its possible mechanism.
Methods: Establishment of mouse model of high blood pressure by drinking 2 mg/mL N'nitro-L-arginine methyl eater hydrochloride(L-NAME) for 4 weeks. One hundred ICR mice were randomly divided into normal control group(n=20) and model group(n=80) according to systolic blood pressure. Eighty hypertensive mice were randomly divided into model control group(n=20), 2.5 mg/L strontium water group(n=20), 5.0 mg/L strontium water group(n=20) and 10.0 mg/L strontium water group(n=20). The body weight and blood pressure of mice were measured every week. After 10 weeks, serum sodium(Na), potassium(K), calcium(Ca), magnesium(Mg), Chlorine(Cl), nitric oxide(NO), renin, angiotensin II(Ang II), aldosterone(ALD), endothelial nitric oxide synthase(eNOS), intercellular cell adhesion molecule-1(ICAM-1), heart interleukin-6(IL-6), interleukin-1 beta(IL-1β) and tumor necrosis factor-α(TNF-α) were determined.
Results: After 10 weeks of intervention, the systolic blood pressure in the low, medium and high strontium water groups(129.60±4.90 mmHg vs.127.33±6.35 mmHg vs.124.70±3.91 mmHg) was significantly lower than that of the model control group(141.84±5.34 mmHg)(P<0.05). The diastolic blood pressure in the high strontium water group(84.74±5.49 mmHg) was significantly lower than that of the model control group(92.21±10.08 mmHg). The contents of serum potassium, calcium and magnesium in medium strontium gourp(8.06±0.80 mmol/L vs.2.34±0.13 mmol/L vs.0.57±0.12 mmol/L) and high strontium group(9.59±0.58 mmol/L vs. 2.37±0.17 mmol/L vs.0.58±0.09 mmol/L) were significantly higher than those in normal control group(6.64±0.57 mmol/L vs.2.07±0.15 mmol/L vs.0.46±0.10 mmol/L) and model control group(6.62±0.53 mmol/L vs.2.09±0.11 mmol/L vs.0.48±0.09 mmol/L)(P<0.05). Compared with model control group, the contents of renin(24.08±6.65 ng/mL vs.15.24±3.88 ng/mL), AngII(263.30±61.66 pg/mL vs.203.31±54.95 pg/mL), ALD(102.41±22.39 pg/mL vs. 60.31±10.83 pg/mL), ICAM-1(367.17±120.08 ng/mL vs.224.45±46.86 ng/mL), IL-6(5.90±0.66 ng/mL vs.3.88±1.08 ng/mL), IL-1β(6.37±1.83 ng/mL vs.3.44±1.28 ng/mL) and TNF-α(9.35±1.41 ng/mL vs.5.68±2.11 ng/mL) in high strontium group were significantly decreased(P<0.05).
Conclusion: Strontium can reduce the blood pressure of hypertensive mice by regulating the eNOS/NO pathway and reducing the production of inflammatory factors.
Keywords: bloodpressure; drinkingwater; inflammation; nitricoxide; strontium.