Effect of Dietary Sodium Intake on Intracellular Calcium in Lymphocytes of Salt-Sensitive Hypertensive Patients
| Autor: | Mario Pause, Zbigniew Gaciong, Vito M. Campese, Shaul G. Massry, Jadwiga M. Alexiewicz, Frederick Karubian |
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| Rok vydání: | 1992 |
| Předmět: |
Adult
Male medicine.medical_specialty Mean arterial pressure Vascular smooth muscle Nifedipine Fura-2 Sodium chemistry.chemical_element Blood Pressure Cell Separation Calcium Essential hypertension chemistry.chemical_compound Cytosol Internal medicine Internal Medicine medicine Humans Lymphocytes Calcium metabolism business.industry Sodium Dietary Middle Aged medicine.disease Endocrinology chemistry Delayed-Action Preparations Hypertension Female Calcium Channels business medicine.drug |
| Zdroj: | American Journal of Hypertension. 5:536-541 |
| ISSN: | 1941-7225 0895-7061 |
| Popis: | High dietary Na+ raises mean arterial pressure (MAP) by more than 10% in salt-sensitive (SS) patients with essential hypertension. To test whether the rise in MAP in these patients is caused by a Na(+)-linked increase in [Ca2+]i in vascular smooth muscle cells, we measured [Ca2+]i in the lymphocytes of 14 patients with essential hypertension kept on a Na+ intake of 20 mEq/day for 9 days, and 200-mEq/day for 14 days. Nifedipine gastrointestinal transport system (GITS) (30 mg/day) was given during the last 4 days of each diet. We isolated lymphocytes on Ficoll-Hypaque gradient and measured [Ca2+]i levels using Fura-2 fluorescent dye. During low Na+ intake, there was no difference in MAP (102 +/- 3.5 v 93 +/- 3.8 mm Hg) and in lymphocytes [Ca2+]i (80 +/- 3.0 v 87 +/- 5.4 nmol/L) between the seven salt-sensitive and the seven salt-resistant patients. During high Na+ intake, MAP (92 +/- 2.8 mm Hg) and [Ca2+]i (85 +/- 6.8 nmol/L) did not change in salt-resistant patients. On the contrary, MAP (115 +/- 3.4 mm Hg) and [Ca2+]i (130 +/- 11.1 nmol/L) increased significantly (P less than .01) in the salt-sensitive patients. Nifedipine did not significantly alter MAP and [Ca2+]i in both groups of patients during low Na+ and in salt-resistant patients during high Na+ intake. On the contrary, during high Na+ intake, nifedipine decreased significantly (P less than .01) both MAP (104 +/- 2.4 mm Hg) and [Ca2+]i (89 +/- 5.7 nmol/L) in salt-sensitive patients.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
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