Colon pathologies involve the activation of a number of inflammation mediators: cytokines, prostanoids and kinines. The expression patterns of the genes associated with their activation may provide a very sensitive marker of the physiological condition of the cells. This paper demonstrates certain statistically significant differences (p = 0.008) between the expression patterns of kinine B1 and B2 receptor encoding genes for colitis ulcerosa and a control group. The ratio of kinine B1/B2 concentrations changes significantly, on the average from 1.3 for a tissue assessed as healthy to 6.6 for colitis ulcerosa.