Indexed on: 01 Dec '73Published on: 01 Dec '73Published in: Diabetologia
No significant differences were found in the erythrocyte 2.3-DPG concentration between 14 normals (16.82±0.66 μmoles 2.3-DPG/g Hb) and 44 diabetic patients (16.22±0.38 μmoles 2.3-DPG/g Hb). However, in diabetic patients we could demonstrate significant fluctuations determined by the metabolic control of their diabetes. Hyperglycaemic patients (n = 10) developed during treatment, concomitant with declining blood glucose, a significant decrease to 13.97± 0.64 [mioles 2.3-DPG/g Hb. After normalization of blood glucose the 2.3-DPG level rose again. Two patients with islet cell tumors had a fluctuation in the 2.3-DPG concentration of about 20%, when symptomatic hypoglycaemia occurred during an extended fast. This variation in 2.3-DPG dependent upon changes in blood glucose was also demonstrated in-vitro by a dialysis technique where glucose was kept constant at 400 or 80 mg/100 ml. Incubating hyperglycaemic blood (n = 6) of uncontrolled diabetics in a high glucose medium, 2.3-DPG was constant over 7 h, whereas at low glucose concentration 2.3-DPG dropped significantly (p < 0.001). Blood from nondiabetic subjects did not show this phenomenon. In-vitro additions of insulin and tolbutamide failed to produce an effect on 2.3-DPG. Our results suggest that pronounced fluctuations of blood glucose in diabetics influence 2.3-DPG levels in erythrocytes and thus might impair peripheral oxygen supply.