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Metabolic response of neutrophils to uremia and dialysis.

Oxidative metabolism of polymorphonuclear leukocytes (PMNs) in uremic patients is enhanced due to unknown serum or plasma factor(s) which are removed during hemodialysis. Respiratory burst activity is diminished in both PMA-stimulated and unstimulated states compared to healthy controls. Hemodialysis treatment normalizes stimulated hydrogen peroxide production and decreases unstimulated hydrogen peroxide production. Several authors found that resting and stimulated chemiluminescence (CL) during hemodialysis correlate with complement activation, whereas other authors describe the development of CL using dialyzer membranes with only mild anaphylatoxin formation. Alterations in PMN carbohydrate metabolism in uremic patients improve during HD. These alterations may be responsible for disturbances in phagocytosis. Degranulation during HD also occurs in the absence of complement activation. Calcium channel blockers decrease activation of PMNs when dialyzers with only little anaphylatoxin formation are used. Acute renal failure and sepsis induce activation of PMNs. Hemodialysis with membranes made of cuprophan leads to further activation of these PMNs and may contribute to granulocyte dysfunction.