• Olav A Gressner, Alexander Koch, Edouard Sanson, Christian Trautwein, and Frank Tacke.
• Institute of Clinical Chemistry and Pathobiochemistry, University Hospital Aachen, Aachen University (RWTH), Aachen, Germany. ogressner@ukaachen.de
• Clin. Biochem. 2008 Aug 1;41(12):974-80.

BackgroundImmune paralysis of phagocytic cells due to excess of the complement activation product C5a has been proposed as a critical pathomechanism in sepsis. In vitro studies suggest an interaction of C5a with Group-specific globulin (Gc-globulin).Study ObjectivesTo examine the predictive value of serum concentrations of both, C5a and actin-free Gc-globulin, and their ratio for prognosis (mortality) of critically ill patients.Patients154 critically ill (septic and non-septic) adult patients admitted to a Medical ICU and 38 healthy controls.MeasurementsActin-free Gc-globulin and C5a were measured on ICU admission, alongside extensive laboratory, clinical and prospective outcome measures.ResultsActin-free Gc-globulin and C5a serum concentrations were significantly reduced in critically ill patients compared with healthy controls. C5a levels, but not actin-free Gc-globulin, were significantly lower in patients with sepsis (n=112) than in critically ill patients without sepsis (n=42). C5a serum level was a prognostic parameter in patients with sepsis: High C5a levels were associated with increased mortality (at ICU and during follow-up). Although C5a and actin-free Gc-globulin were positively correlated, increasing serum concentrations of actin-free Gc-globulin did not enhance the C5a dependent effects in terms of prognosis or mortality in septic patients.ConclusionsInvestigation for C5a and/or actin-free Gc-globulin serum levels upon admission to the ICU may be helpful diagnostic tools. In patients with sepsis, C5a levels are an independent predictor of prognosis. However, different to pre-existing in vitro data, a clinically relevant interaction between actin-free Gc-globulin and C5a in terms of prognosis in severe inflammatory conditions is not given.

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