Neutrophil dysfunction after biomaterial contact in an in vitro model of cardiopulmonary bypass.
OBJECTIVE
Cardiopulmonary bypass (CPB) induces neutrophil degranulation and superoxide anion production in vivo. We hypothesized that CPB-associated neutrophil dysregulation alters neutrophil adhesion to vascular endothelial cells and the extracellular matrix.


METHODS
We, therefore, recirculated neutrophils in polyvinyl chloride (PVC) tubing using a roller pump model and thereafter measured adhesion to cultured microvascular endothelial cells and gelatin-coated surfaces. Recirculation-induced neutrophil priming or exhaustion was tested by boosting with phorbol myristate-acetate (PMA) or N-formyl-methiolyl-leucyl-phenylalanine (FMLP) before quantification of adhesion.


CONCLUSIONS
After recirculation, neutrophils retained their adhesive capability to vascular endothelial cells, whereas adhesion to gelatin increased. This increase was not seen when the neutrophils were recirculated with a rotator instead of a roller pump, indicating that not only the pump mode but also foreign surface contact was of significance. The neutrophil PMA response after recirculation was not altered compared to resting neutrophils prestimulated with PMA. Recirculated neutrophils adhered less to cultured vascular endothelial cells after FMLP activation and more to gelatin compared to resting neutrophils prestimulated with FMLP. It is conceivable that dysregulation of neutrophil adhesive capability may play a part in the development of tissue damage after CPB.
Asberg
Ann E
AE
Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology, Trondheim, Norway. ann.asberg@ntnu.no
Videm
Vibeke
V
D001672:Biocompatible Materials; D002315:Cardiopulmonary Bypass; D002448:Cell Adhesion / Q000502:physiology; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology; D005780:Gelatin; D006801:Humans; D008955:Models, Cardiovascular; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D018375:Neutrophil Activation / Q000502:physiology; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D011143:Polyvinyl Chloride; D013499:Surface Properties; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
D001672:Biocompatible Materials; D009240:N-Formylmethionine Leucyl-Phenylalanine; D005780:Gelatin; D011143:Polyvinyl Chloride; D013755:Tetradecanoylphorbol Acetate