Imunossupressão com tacrolimus favorece a regeneração hepática induzida por hepatectomia extensa em ratos

RACIONAL: A regeneração hepática representa o resultado de respostas fisiológicas que ocorrem após perdas de parênquima, como consequência de agressões tóxico-medicamentosas, infecciosas, traumáticas ou cirúrgicas. OBJETIVO: Avaliar, em dois momentos distintos da regeneração hepática, a influência d...

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Published inArquivos brasileiros de cirurgia digestiva : ABCD Vol. 23; no. 2; pp. 74 - 80
Main Authors Gama Filho, Ozimo, Toderke, Edimar Leandro, Baretta, Giorgio Alfredo Pedroso, Sakamoto, Daniele Giacometti, Agulham, Miguel Angelo, Tambara, Elizabeth Milla, Matias, Jorge Eduardo Fouto
Format Journal Article
LanguageEnglish
Published 01.06.2010
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Abstract RACIONAL: A regeneração hepática representa o resultado de respostas fisiológicas que ocorrem após perdas de parênquima, como consequência de agressões tóxico-medicamentosas, infecciosas, traumáticas ou cirúrgicas. OBJETIVO: Avaliar, em dois momentos distintos da regeneração hepática, a influência do tacrolimus sobre o fenômeno da regeneração hepática desencadeada pela ressecção de 70% do parênquima hepático em ratos plenamente desenvolvidos. MÉTODO: Utilizaram-se 40 ratos Wistar com peso médio de 510,08 g ± 11.66 g divididos aleatoriamente em dois grupos de 20 (Estudo e Controle), cada grupo subdividido em dois subgrupos conforme o dia da morte após a hepatectomia (24 horas e 7 dias). De acordo com o grupo os animais receberam por gavagem, diariamente, iniciando três dias antes da hepatectomia e prolongando-se por todo o período de observação, solução aquosa de tacrolimus 0,1 mg/kg/dia ou solução salina no mesmo volume. Após três dias de pré-terapia todos foram submetidos à hepatectomia de 70% pela ressecção dos lobos hepáticos mediano e lateral esquerdo que foram pesados para posterior cálculo da regeneração hepática pela fórmula de Kwon. Vinte e quatro horas ou sete dias após a hepatectomia, 10 animais de cada grupo foram mortos, os fígados remanescentes (regenerados) foram pesados e amostrados para realização de índice mitótico por hematoxilina-eosina e estudo imunoistoquímico com os marcadores PCNA e Ki-67. RESULTADOS: Os animais que receberam tacrolimus mostraram índice maior de regeneração hepática, atingindo significância estatística quando comparado ao subgrupo de animais mantidos com placebo quando analisados pelos parâmetros: fórmula de Kwon, índice mitótico e marcador PCNA. A tendência para o marcador Ki-67 foi idêntica aos outros parâmetros, mas não alcançou significância estatística. CONCLUSÕES: A imunossupressão com tacrolimus possui efeito estimulante no processo de regeneração hepática desencadeado pela hepatectomia 70% em ratos Wistar adultos, plenamente desenvolvidos. BACKGROUND: Liver regeneration is the result of physiological responses that occur after loss of parenchyma, as a consequence of drug abuse-toxic, infection, trauma or surgical procedure. AIM: 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 (Study or Control), each group divided into two subgroups according to the death day after 70% hepatectomy (24 hours or 7 days). According to the group of study, rats received 0.1mg/Kg/day of tacrolimus or the same volume of saline solution, by gavage, daily, starting three days before hepatectomy until the end of observation (animal death´s day). 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 10 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.
AbstractList RACIONAL: A regeneração hepática representa o resultado de respostas fisiológicas que ocorrem após perdas de parênquima, como consequência de agressões tóxico-medicamentosas, infecciosas, traumáticas ou cirúrgicas. OBJETIVO: Avaliar, em dois momentos distintos da regeneração hepática, a influência do tacrolimus sobre o fenômeno da regeneração hepática desencadeada pela ressecção de 70% do parênquima hepático em ratos plenamente desenvolvidos. MÉTODO: Utilizaram-se 40 ratos Wistar com peso médio de 510,08 g ± 11.66 g divididos aleatoriamente em dois grupos de 20 (Estudo e Controle), cada grupo subdividido em dois subgrupos conforme o dia da morte após a hepatectomia (24 horas e 7 dias). De acordo com o grupo os animais receberam por gavagem, diariamente, iniciando três dias antes da hepatectomia e prolongando-se por todo o período de observação, solução aquosa de tacrolimus 0,1 mg/kg/dia ou solução salina no mesmo volume. Após três dias de pré-terapia todos foram submetidos à hepatectomia de 70% pela ressecção dos lobos hepáticos mediano e lateral esquerdo que foram pesados para posterior cálculo da regeneração hepática pela fórmula de Kwon. Vinte e quatro horas ou sete dias após a hepatectomia, 10 animais de cada grupo foram mortos, os fígados remanescentes (regenerados) foram pesados e amostrados para realização de índice mitótico por hematoxilina-eosina e estudo imunoistoquímico com os marcadores PCNA e Ki-67. RESULTADOS: Os animais que receberam tacrolimus mostraram índice maior de regeneração hepática, atingindo significância estatística quando comparado ao subgrupo de animais mantidos com placebo quando analisados pelos parâmetros: fórmula de Kwon, índice mitótico e marcador PCNA. A tendência para o marcador Ki-67 foi idêntica aos outros parâmetros, mas não alcançou significância estatística. CONCLUSÕES: A imunossupressão com tacrolimus possui efeito estimulante no processo de regeneração hepática desencadeado pela hepatectomia 70% em ratos Wistar adultos, plenamente desenvolvidos. BACKGROUND: Liver regeneration is the result of physiological responses that occur after loss of parenchyma, as a consequence of drug abuse-toxic, infection, trauma or surgical procedure. AIM: 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 (Study or Control), each group divided into two subgroups according to the death day after 70% hepatectomy (24 hours or 7 days). According to the group of study, rats received 0.1mg/Kg/day of tacrolimus or the same volume of saline solution, by gavage, daily, starting three days before hepatectomy until the end of observation (animal death´s day). 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 10 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.
Author Sakamoto, Daniele Giacometti
Baretta, Giorgio Alfredo Pedroso
Toderke, Edimar Leandro
Matias, Jorge Eduardo Fouto
Gama Filho, Ozimo
Agulham, Miguel Angelo
Tambara, Elizabeth Milla
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