Abstract
To evaluate whether granulocyte-colony stimulating factor (G-CSF) improves an impaired production of oxygen-derived free radicals by neutrophils from poorly controlled NIDDM patients, we studied the effect of G-CSF on myeloperoxidase (MPO) activity and chemiluminescence amplified by a Cypridina luciferin analog (CLA-DCL), which is dependent on O2 generation, and luminol (L-DCL), which is dependent on OCl(-) generation, in response to formyl-methonyl-leucyl-phenylalanine. Both CLA-DCL and L-DCL by neutrophils from the diabetic group (n = 15, HbA(1c) >10%) were significantly decreased (26 and 37%, respectively: P < 0.01) compared with the age-matched normal control group (n = 15), and L-DCL was more sensitive to this inhibition than CLA-DCL (P < 0.05). In both control and diabetic neutrophils, G-CSF significantly enhanced both CLA-DCL (175% in control and 156% in diabetic) and L-DCL (283% in control and 346% in diabetic). In diabetic neutrophils, the enhancing effect of G-CSF on L-DCL was more sensitive than on CLA-DCL (P < 0.001). There was a positive correlation between HbA(1c) and the enhancing effect of G-CSF on L-DCL in diabetic patients (P < 0.05), but not on CLA-DCL. MPO activity was also decreased in the diabetic group (6...Continue Reading
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