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 in | Arquivos brasileiros de cirurgia digestiva : ABCD Vol. 23; no. 2; pp. 74 - 80 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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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. |
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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 |
Author_xml | – sequence: 1 givenname: Ozimo surname: Gama Filho fullname: Gama Filho, Ozimo organization: Universidade Federal do Paraná, Brasil – sequence: 2 givenname: Edimar Leandro surname: Toderke fullname: Toderke, Edimar Leandro organization: Universidade Federal do Paraná, Brasil – sequence: 3 givenname: Giorgio Alfredo Pedroso surname: Baretta fullname: Baretta, Giorgio Alfredo Pedroso organization: Universidade Federal do Paraná, Brasil – sequence: 4 givenname: Daniele Giacometti surname: Sakamoto fullname: Sakamoto, Daniele Giacometti organization: Universidade Federal do Paraná, Brasil – sequence: 5 givenname: Miguel Angelo surname: Agulham fullname: Agulham, Miguel Angelo organization: Universidade Federal do Paraná, Brasil – sequence: 6 givenname: Elizabeth Milla surname: Tambara fullname: Tambara, Elizabeth Milla organization: Universidade Federal do Paraná, Brasil – sequence: 7 givenname: Jorge Eduardo Fouto surname: Matias fullname: Matias, Jorge Eduardo Fouto organization: Universidade Federal do Paraná, Brasil |
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