Crescimento pulmonar compensatório (CPC): massa corpórea, conteúdo protéico e massa pulmonares em ratos subnutridos trilobectomizados
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Data
2004-04-01
Autores
Ruiz Júnior, Raul Lopes [UNESP]
Carvalho, Lídia Raquel de [UNESP]
Cataneo, Antonio José Maria [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia
Resumo
OBJETIVO:Avaliar o comportamento bioquímico do CPC após trilobectomia no rato adulto jovem subnutrido. MÉTODOS: Foram utilizados 137 ratos Wistar, machos, subnutridos pela oferta de 33% da ingestão diária normal na fase de adaptação e durante o experimento, distribuídos por sorteio, em 9 grupos experimentais, submetidos a três tratamentos (Controle, Toracotomia, Trilobectomia) e sacrificados em três momentos (7, 30 e 90 dias). Na Trilobectomia foram extirpados os lobos médio, acessório e caudal direitos, que representavam 55% do tecido pulmonar. Estudou-se os seguintes atributos e variáveis: massa corpórea e pulmonar, relação entre massa pulmonar e corpórea e conteúdos protéicos pulmonares. RESULTADOS: No lobo cranial e no pulmão esquerdo, tanto a massa quanto os conteúdos protéicos, nos trilobectomizados, foram maiores em todos os momentos do estudo quando comparados aos demais, sendo este aumento suficiente para compensar a perda dos três lobos. Os conteúdos protéicos do lobo cranial e do pulmão esquerdo, nos trilobectomizados, tiveram o mesmo comportamento da massa pulmonar, mas este aumento não foi suficiente para compensar a perda dos três lobos. CONCLUSÕES: Nos ratos adultos subnutridos trilobectomizados ocorre CPC. A recuperação da massa pulmonar é total, mas o conteúdo protéico pulmonar apesar de aumentar, não chega aos valores dos ratos não trilobectomizados.
PURPOSE: To evaluate the biochemical behavior of compensatory lung growth after trilobectomy in undernourished rats. METHODS: Undernutrition was achieved by offering 33% normal daily diet to 137 adult male Wistar rats over an acclimatization period and throughout the experiment. Rats were randomly distributed into nine (3 Control, 3 Thoracotomy, and 3 Trilobectomy) groups. Analysis was 7, 30, and 90 days after surgery (Trilobectomy is middle, accessory and caudal lobectomies). Body mass, lung mass, and lung tissue protein content were studied. RESULTS: Cranial lobe and left lung mass both larger in trilobectomized rats throughout the study compared to the other groups. Comparing combined lung mass, we noted that there was sufficient compensatory growth to be on a par with controls. Cranial lobe and left lung protein content in trilobectomized rats both displayed the same behavior as lung mass throughout the study, but the compensatory growth in the remaining two lobes was not sufficient to make up for trilobectomy losses. CONCLUSION: In adult undernourished rats, there was compensatory lung growth after trilobectomy, there was also lung mass recovery at the beginning of the study compared to other groups. Throughout the study, cranial lobe and left lung protein content were higher in trilobectomized rats than other groups.
PURPOSE: To evaluate the biochemical behavior of compensatory lung growth after trilobectomy in undernourished rats. METHODS: Undernutrition was achieved by offering 33% normal daily diet to 137 adult male Wistar rats over an acclimatization period and throughout the experiment. Rats were randomly distributed into nine (3 Control, 3 Thoracotomy, and 3 Trilobectomy) groups. Analysis was 7, 30, and 90 days after surgery (Trilobectomy is middle, accessory and caudal lobectomies). Body mass, lung mass, and lung tissue protein content were studied. RESULTS: Cranial lobe and left lung mass both larger in trilobectomized rats throughout the study compared to the other groups. Comparing combined lung mass, we noted that there was sufficient compensatory growth to be on a par with controls. Cranial lobe and left lung protein content in trilobectomized rats both displayed the same behavior as lung mass throughout the study, but the compensatory growth in the remaining two lobes was not sufficient to make up for trilobectomy losses. CONCLUSION: In adult undernourished rats, there was compensatory lung growth after trilobectomy, there was also lung mass recovery at the beginning of the study compared to other groups. Throughout the study, cranial lobe and left lung protein content were higher in trilobectomized rats than other groups.
Descrição
Palavras-chave
Pulmão, Transtornos nutricionais, Ratos Wistar, Lung, Nutricion disorders, Wistar rats
Como citar
Acta Cirúrgica Brasileira. Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia, v. 19, n. 2, p. 146-152, 2004.