Navegando por Palavras-chave "Hematopoese Extramedular"

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    Hepatic damage in newborns from female rats exposed to the pesticide derivative ethylenethiourea
    (Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia, 2012-12-01) Lemos, Patrícia Veruska Ribeiro Barbosa; Martins, Jose Luiz [UNIFESP]; Lemos, Sidney Pereira Pinto [UNIFESP]; Santos, Fernando Leandro Dos; Silva, Sílvio Romero Gonçalves E; Sao Francisco Valley Federal University Department of Medicine; Universidade Federal de São Paulo (UNIFESP); UNIVASF Department of Medicine; Federal Rural University Department of Veterinary Medicine
    PURPOSE: To evaluate hepatic morphological-histological abnormalities in newborns from female rats exposed to ethylenethiourea. METHODS: A randomized study was conducted on fifty-five newborn Wistar rats were studied: 34 in the experimental group, whose mothers had been exposed to 1% ethylenethiourea; and 21 in the control group, whose mothers had received 0.9% physiological solution. The solution was administered via gavage on the 11th day of gestation. Cesarean section was performed on the 20th day of gestation. The newborns' livers were examined and any morphological-histological abnormalities were registered. The presence of megakaryocytes was quantified in 50 microscope fields, as the total number of these cells per mm². RESULTS: The entire experimental group presented abnormalities of embryonic formation, with musculoskeletal anomalies, digestive system anomalies, hepatic congestion and friability, hydrops and delayed intrauterine growth. The histopathological analysis showed that morphological-histological hepatic destructuring had occurred in all entire experimental with removal of the hepatic trabeculae and severe hepatic megakaryocytosis. The mean megakaryocyte density ranged from 107.9 to 114.2 per mm², and it was eight times greater than in the control group, thus characterizing a situation of extramedullary hematopoiesis. CONCLUSION: The fetal exposure to ethylenethiourea caused hepatic damage characterized by severe extramedullary hematopoiesis.