Monocytes obtained from 44 diabetics were stimulated with concanavalin A and cytochalasin E, and the resulting superoxide production was assessed to see if it was affected by the degree of control of the diabetes.
In controls, the O generation was 12.4±3.0 (mean±SD) nmol/min/10
6 cells, and in diabetics, it was 9.9±2.9, which was significantly lower than in the controls (p<0.001).
Diabetic subjects were classified into three groups according to their fasting glucose levels: one, good control (FBS 140 mg/100ml); two, fair control (FBS>140 mg/100ml and <200mg/100ml), and three, poor control (FBS 200mg/100ml). These groups generated O levels of 11. 5±2.0, 10.0±2.2 and 8.7±3.3 nmol/min/10
6 cells. O generation in the poorly controled group was significantly lower than in the well controlled group (p<0.02). A negative correlation was found between O production and the hemoglobin A
1 value (r=-0.48).
The untreated group showed significantly lower O generation than the insulin treated group (p<0.01).
These findings suggest that impaired O production, which leads to decreased bactericidal activity of monocytes, might be one of the factors which account for the high susceptibility of diabetics to infection.
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