1. Whole-body elimination rate of 22Na+ was decreased in normotensive or borderline first-degree relatives of hypertensive probands. 2. Whole-body potassium, exchangeable sodium and urine excretion of sodium, potassium and creatinine were similar in relatives and controls. 3. Erythrocyte net influx of 22Na+ was significantly increased in normotensive relatives. 4. Abnormal whole-body and cellular handling of sodium (22Na+) demonstrated in relatives indicates that this abnormality may have an important role in the development of essential hypertension in man.
These findings show an increase in serum hepcidin in a large group of female athletes. The elevated hepcidin levels may affect the iron balance of the athletes, adding to the traditional explanation of dietary intake/iron loss balance.
The number of specific [3H]ouabain binding sites in T-lymphocytes was determined and linear Scatchard plots were obtained. The number of sites was 30088 +/- 3039 (mean +/- SD) per lymphocyte in 14 healthy males and 33939 +/- 3185 in 11 males with type 2 diabetes (P less than 0.01). No difference between the dissociation constants were found (Kd = 3.91 and 3.86 mmol/l). The number of binding sites in lymphocytes from 15 healthy males with normal glucose tolerance but with a strong family history of type 2 diabetes did not differ from the controls. In T-lymphocytes a significantly higher number of specific ouabain binding sites was found than in non-T-lymphocytes (P less than 0.01). There was no difference between the dissociation constants. (Kd = 3.69 and 3.97 mmol/l). Intra-lymphocytic sodium was measured in 18 healthy individuals and the mean content was 8.1 +/- 2.3 mmol/kg lymphocytes. A lower content of sodium in T- compared to non-T-lymphocytes was also found (5.9 +/- 0.8 mmol/kg vs 15.5 +/- 0.8 mmol/kg, P less than 0.001). There was no correlation between lymphocytes and erythrocytes concerning [3H]ouabain binding sites or sodium concentration.
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