[Thromboxane analyses in patients with chronic inflammatory bowel diseases].

Prostanoids are important for the pathogenesis of chronic inflammatory bowel diseases as mediators of inflammatory, immune and allergic reactions. The levels of thromboxane B2(TXB2), the stable hydrolysis product of thromboxane A2(TXA2) were determined in blood plasma of patients with chronic inflammatory bowel diseases. The platelet malondialdehyde (MDA) formation was determined as an indicator of the TXA2 synthetase activity. The TXB2 concentrations were measured radioimmunologically. The platelet MDA formation induced by N-ethylmaleimide was investigated with the thiobarbituric acid reaction. The investigated patients (n = 10) suffering from ulcerative colitis had a significant increasing (p less than 0.02) of the platelet MDA formation (mean = 4.39 nmol/10(9) platelets) in comparison to the normal group (n = 20; mean = 2.87; nmol/10(9) platelets). The increasing of TXB2 levels was not significantly different than in normal control subjects. The plasma concentrations of 6-keto-PGF1 were situated on the limit of detection.