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. 1979 Nov;76(11):5896–5900. doi: 10.1073/pnas.76.11.5896

Enhancement of hexose uptake in human polymorphonuclear leukocytes by activated complement component C5a

Charles E McCall 1,2, David A Bass 1,2, Sue Cousart 1,2, Lawrence R DeChatelet 1,2
PMCID: PMC411759  PMID: 293691

Abstract

The polymorphonuclear leukocyte (PMNL) depends on glucose as a source of energy for motility, chemotaxis, phagocytosis, and bactericidal activity. Activated complement (C5a) at low concentrations stimulates carrier-mediated carbohydrate transport in PMNLs as measured by the uptake of 2-deoxy-D-[3H]glucose. Human PMNLs were preincubated at 37°C for 15 min with zymosan-activated human serum or various purified preparations of human C5a. A concentration-dependent increase in deoxyglucose transport (>700% of control) into PMNLs occurred with all test substances. Reaction was linear for 30 min, and uptake of deoxyglucose followed saturation kinetics. C5a caused a decrease in the Km for deoxyglucose, from 0.53 to 0.11 mM, without altering the Vmax (44 nmol/30 min per 5 × 106 PMNLs in control and 46.6 with C5a). The optimal concentration of C5a for enhanced carrier-mediated transport of deoxyglucose was similar to that which promoted optimal chemotaxis. Activated serum from C5-deficient mice had little or no effect on deoxyglucose transport whereas that from normal syngeneic mice enhanced deoxyglucose transport. C5a did not enhance deoxyglucose transport into isolated erythrocytes, platelets, or lymphocytes. The deoxyglucose within the cell was primarily in the phosphorylated form, and hexokinase activity was not increased in PMNLs stimulated with C5a, indicating that hexokinase was not rate limiting and that enhanced transport was the mechanism of the C5a activity. Insulin at physiologic concentration (10 ng/ml) had no effect on deoxyglucose transport in PMNL and did not act as a competitive inhibitor of C5a. This insulin-like bioactivity could be detected with the amount of C5a that would be present after activation of 0.1-0.5% of the C5 in 1 ml of serum. This suggests that uptake of [3H]deoxyglucose by PMNLs might serve as a highly sensitive test for activation of the fifth component of complement.

Keywords: hexose transport, leukocyte metabolism

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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