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Revista do Colégio Brasileiro de Cirurgiões

Print version ISSN 0100-6991


GAMA FILHO, Ozimo et al. Tacrolimus-based immunossupression favours liver regeneration induced by extent hepatectomy in rats. Rev. Col. Bras. Cir. [online]. 2010, vol.37, n.3, pp.218-225. ISSN 0100-6991.

OBJECTIVE: To analyze, during two different moments of liver regeneration, the effect of the immunosuppressant Tacrolimus on the 70% hepatectomy model-induced liver regeneration in adult rats. METHODS: Forty Wistar adult rats, weighing 510.08 + 11.66 g were randomly divided into two groups, each group divided into two subgroups according to the death day after 70% hepatectomy . According to the group of study, rats received 0.1mg/Kg/day of Tacrolimus or the same volume of saline solution, by gavage. After three days of pre-therapy, all animals were submitted to 70% hepatectomy by resection of median and left lateral hepatic lobes which were weighed for posterior calculation of liver regeneration by Kwon´s formula. Twenty four hours or seven days after hepatectomy ten rats of each group were killed; the remaining liver (regenerated) was entirely resected, weighed and sampled for mitotic index on hematoxylin-eosin staining and immunohistochemical assays with PCNA and Ki-67 markers. Data were statistically analyzed by Mann-Whitney or Student "t" tests, with significance level of 5% (p<0.05). RESULTS: Rats receiving tacrolimus showed statistically significant higher levels of liver regeneration when compared to placebo according to Kwon's formula, mitotic index and PCNA marker. Identical trend was found with Ki-67 marker, but without statistical significance. CONCLUSION: Tacrolimus-based immunossuppression has stimulatory effect on liver regeneration process induced by 70% hepatectomy in adult Wistar rats.

Keywords : Tacrolimus; Hepatectomy; Liver regeneration.

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