Complement and neutrophil function changes after liver resection in humans.
BACKGROUND
Complement activation contributes to the regulation of liver regeneration after liver resection (LR) in mice.


METHODS
We hypothesized that complement activation and changes in C5a-receptors (C5aR, C5L2) on polymorphonuclear cells (PMN) and monocytes are important in clinical LR. Anaphylatoxin and C5b9 plasma levels were measured (bead-array, ELISA) (25 patients) and receptor expression was assessed after LR (19 patients) (FACS). In vitro PMN C5a-dependent chemotactic response (7 patients) as well as L-selectin shedding and Mac-1 expression (3 patients) was determined.


RESULTS
C3a increased after LR (31.1 +/- 4 before LR vs. 41.6 +/- 5 ng/ml, 30 min after LR, P < 0.01), as did C5b9 (12.7 +/- 1 before LR vs. 26.9 +/- 3 ng/ml, 60 min after LR, P < 0.001). C4a and C5a decreased after LR, by 25% 24 h after LR and 30% 2 h after LR, respectively (P < 0.01). C5L2 expression decreased at 4 h, rising at 24 h after LR (PMN: 6.3 +/- 1 before LR, 3.1 +/- 1, 4 h, 8.3 +/- 2, 24 h; P < 0.01). The receptor-related changes accompanied a diminished C5a-dependent chemotactic response by PMN (42.1 +/- 17 before LR vs. 2.1 +/- 3 4 h after LR; P < 0.01) and a reduction of activation upon C5a-R stimulation as measured by L-selectin shedding and Mac-1 expression on PMN. Changes in C5L2 expression on monocytes paralleled postoperative impairment of liver function.


CONCLUSIONS
These results indicate that complement components are released after clinical LR and subsequently PMN display altered C5a-dependent functional responses.
Strey
Christoph Werner
CW
Department of General and Vascular Surgery, Medical School, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, Frankfurt am Main 60590, Germany. strey@gmx.de
Siegmund
Britta
B
Rosenblum
Saskia
S
Marquez-Pinilla
Rosa Maria
RM
Oppermann
Elsie
E
Huber-Lang
Markus
M
Lambris
John D
JD
Bechstein
Wolf O
WO
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000706:Anaphylatoxins / Q000276:immunology; D000818:Animals; D003165:Complement System Proteins / Q000276:immunology*; D006498:Hepatectomy; D006801:Humans; D008099:Liver / Q000276:immunology*; D008115:Liver Regeneration / Q000276:immunology*; D008297:Male; D051379:Mice; D008875:Middle Aged; D009000:Monocytes / Q000276:immunology; D009504:Neutrophils / Q000276:immunology*
D000706:Anaphylatoxins; D003165:Complement System Proteins