[The therapeutic effects of heparin on TNBS-induced rat colitis model]

To study the relationship between coagulation abnormal and inflammatory in the TNBS induced rats colitis model as well as the therapeutic effect of heparin on this model.

Forty SD-rats were separated into 4 groups randomly, including normal control group, colitis group, heparin group and SASP group. PT, APTT and the activity of antithrombin (AT) were chosen as indexs of coagulation. The level of damage and inflammatory state of the colitis rats were assessed by macroscopical score, histological score and the level of TNFalpha in each group.

Compared with normal control group, TNBS induced colitis group has a shorter PT [(14.83 +/- 0.45) s vs (16.68 +/- 1.08) s, P < 0.05] and APTT [(12.49 +/- 1.30) s vs (29.06 +/- 1.60) s, P < 0.05] and a lower activity level of AT [(111.33 +/- 8.50)% vs (122.13 +/- 3.52)%, P < 0.05]. In heparin group, PT, APTT were prolonged [PT: (17.83 +/- 0.78) s vs (14.83 +/- 0.45) s, P < 0.05, APTT: (53.34 +/- 9.49) s vs (12.49 +/- 1.30) s, P < 0.05] and AT activity was higher than colitis group [(131.67 +/- 6.92)% vs (111.33 +/- 8.50)%, P < 0.05]. SASP group has a similar data in PT, APTT compared with colitis group and no statistical significance (P > 0.05). The activity of AT in SASP group is higher than in colitis group [(122.33 +/- 5.82)% vs (111.33 +/- 8.50)%, P < 0.05]. The heparin therapy group showed lower macroscopical score (2.50 +/- 0.55 vs 4.75 +/- 1.16, P < 0.05), histological scores (3.83 +/- 0.41 vs 7.75 +/- 1.04, P < 0.05) and the level of TNFalpha [(84.75 +/- 18.03) ng/L vs (149.93 +/- 23.52) ng/L, P < 0.05] compared with the colitis group.

Coagulation was abnormality in the rat colitis model induced by TNBS; heparin therapy is effective in the colitis model. It seemed that the abnormality of coagulation plays an important role in the pathogenesis of the rat colitis model.