Different molecules are involved in the recruitment of leukocytes during inflammation. The aim was to investigate (i) the contribution of acinar cells to the overall production of ICAM-1 and (ii) the kinetics of leukocyte CD11b/CD18 expression during acute pancreatitis (AP) induced by bile-pancreatic duct obstruction (BPDO) to evaluate the contribution of both molecules to leukocyte homing. The role of reactive oxygen species (ROS) as mediators in the expression of ICAM-1 and CD11b/CD18 was examined by using N-acetylcysteine (NAC) as an antioxidant treatment. By mechanisms resistant to NAC treatment, acinar cells were able to produce ICAM-1 at first onset of AP; other cell sources contribute to maintaining increased ICAM-1 plasma levels during AP. By contrast, CD11b/CD18 was overexpressed in leukocytes in the course of AP by oxidant-dependent mechanisms. Since NAC treatment reduced neutrophil infiltration in the pancreas, we conclude that CD11b/CD18 over-expression is required for leukocyte recruitment; however, other adhesion molecules in addition to ICAM-1 seem to contribute to leukocyte homing during BPDO-induced AP.
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