Effect of the Ileum and Colon on Liver Regeneration.

PURPOSE

The colon and ileum play significant roles on liver physiology. Studies about simultaneous hepatectomy and colectomy or enterectomy are scarce and controversial. We investigated and compared the effects of ileum and colon resection on liver regeneration.

MATERIALS AND METHODS

Twenty four Wistar rats were allocated in group I-(sham), group II-70% hepatectomy; group III-70% hepatectomy + ileal resection, and group IV-70% hepatectomy + partial colectomy. On the sixth day, serum hepatic enzymes, albumin, hepatocyte growth-factor (HGF) and transforming growth factor-alpha (TGF-α) were measured. The hepatic regeneration rate was estimated. Ki-67 immunohistochemical analysis was done in remnant liver.

RESULTS

Hepatic enzymes levels were significantly higher in group III rats comparing to the other groups (p < 0.001). In group IV, the levels were significantly lower than in groups II and III (p < 0.001). Albuminemia was significantly lower in group III rats comparing with the other groups (p < 0.001). Albuminemia was not different comparing groups I and IV (p > 0.05). Cytokines HGF and TGF-α levels in group IV were significantly higher than in the other groups (p < 0.001). Liver regeneration rate was higher group IV than in groups II and III, and the difference was statistically significant (p = 0.002). The hepatocytes expression of Ki-67 was significantly higher in the remnant liver of group IV than in group III (p = 0.002). There was no difference in Ki-67 expression between groups II and IV (p > 0.05).

CONCLUSION

Ileum and colon resection have different effects on liver regeneration. Colon resection positively influences liver regeneration, while ileum resection negatively influences the regenerative process, in a rat model.