[3H]ouabain binding and sodium content in lymphocyte sub-populations and the demonstration of increased binding in type 2 diabetes mellitus.
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.
D001786:Blood Glucose / Q000032:analysis; D001792:Blood Platelets / Q000378:metabolism; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D004912:Erythrocytes / Q000378:metabolism; D006098:Granulocytes / Q000378:metabolism; D006801:Humans; D007328:Insulin / Q000097:blood; D008214:Lymphocytes / Q000378:metabolism*; D008875:Middle Aged; D009000:Monocytes / Q000378:metabolism; D010042:Ouabain / Q000097:blood*; D011188:Potassium / Q000097:blood; D011955:Receptors, Drug / Q000378:metabolism*; D012964:Sodium / Q000097:blood*; D000254:Sodium-Potassium-Exchanging ATPase; D013601:T-Lymphocytes / Q000378:metabolism
D001786:Blood Glucose; D007328:Insulin; D011955:Receptors, Drug; C028996:cardiac glycoside receptors; D010042:Ouabain; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium