Low plasma protein Z levels in patients with ischemic colitis.

Hypercoagulable states have been suggested to play an important role in the pathogenesis of ischemic colitis. Since protein Z is, as recently demonstrated, important in the regulation of coagulation, we investigated the plasma levels of protein Z in connection to factor V Leiden (FVL) and anti-phospholipid antibodies in patients with a definite diagnosis of ischemic colitis. The plasma levels of protein Z were measured using a commercially available enzyme-linked immunosorbent assay in 33 patients with ischemic colitis, 13 patients with diverticulitis, and 33 healthy controls. Mean plasma protein Z levels were 1.38 +/- 0.52 microg/ml in patients with ischemic colitis and were significantly lower compared to healthy controls (1.86 +/- 0.49 microg/ml) and patients with diverticulitis (1.72 +/- 0.53 microg/ml) (P = 0.001). Protein Z deficiency was found in patients cases with ischemic colitis (18.2%) compared to one with diverticulitis (7.7%) and one healthy control (3.0%). In conclusion, our results suggest that low plasma protein Z levels may play a role in the disease development in some cases with ischemic colitis.