BALB/C小鼠炎症性肠病动物模型建立方法探讨

Therapeutic mechanism of Changyanqing in treatment of colitis induced by dextran sulfate sodium

AIM: To investigate the therapeutic effects of Changyanqing on dextran sulfate sodium(DSS)-induced colitis and its mechanism.

METHODS: DSS was used to establish the model of experimental colitis in 40 mice. Then the mice were averagely randomized into 4 groups (A, B, C, and D). The mice in group A, B, and C were treated with Changyanqing, salicylazosulfapyridine (SASP), and Changyanqing + SASP, respectively, and those in group D served as controls. Changyanqing was administratered by gastric irragation at a dose of 0.2 mL/(20g•d) for 7 d. The disease activity index (DAI) and the activity of intestinal myeloperoxidase (MPO) were observed. The levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) and IL-6 mRNA were detected by semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR).

RESULTS: In comparison with those in the controls, the DAI (1.413 ± 0.835 vs 2.167 ± 0.911, P < 0.05), and activity of MPO (72.4 ± 0.590 nkat/g vs 117.0 ± 0.902 nkat/g, P < 0.05), and the expression of TNF-α (0.841 ± 0.190 vs 1.320 ± 0.282, P < 0.05), IL-1β (0.641 ± 0.095 vs 0.920 ± 0.082, P < 0.05), and IL-6 (1.241 ± 0.247 vs 1.620 ± 0.312, P < 0.05) mRNA were significantly decreased in group A. The above decreases were more significant in group C (DAI: 0.608 ± 0.449; MPO: 27.3 ± 0.211; TNF-α: 0.339 ± 0.081; IL-1β: 0.239 ± 0.073; IL-6: 0.639 ± 0.141)(P < 0.01). There was marked difference between group A and B (P > 0.05).

CONCLUSION: Changyanqing is effective in the treatment of DSS-induced colitis, which may be associated with the decrease of DAI, MPO activity, and TNF-α, IL-1β and IL-6 mRNA expression.