title: Reconsideration of histopathology and ultrastructural aspects of the human liver in yellow fever.
abstract: Yellow fever is a re-emerging infectious disease that currently is at risk of urbanization due to the advance of the Aedes aegypti vector. The disease affects about 200,000 individuals annually, mainly in tropical Africa and South America. It causes severe disease involving especially the liver, with lesions characterized by midzonal steatosis, apoptosis and lytic necrosis of the hepatocytes. Quantitative histological and immunohistochemical analysis of 53 human hepatic samples demonstrated apoptosis, steatosis and lytic necrosis of hepatocytes with midzonal pattern. No substantial alterations and reticular network were observed. The inflammatory infiltrate consisted of mononuclear cells and intensity was minimal or moderate, disproportionate to the intense death of the hepatocytes. Hepatic damage in yellow fever resulted mainly from a massive death of hepatocytes due to apoptosis and to a lesser extent due to lytic necrosis. It is recommended that therapeutic regimens for serious cases should include measures to protect against apoptosis.
authors.affiliation: Tropical Medicine Unit, Department of Pathology, State University of Para, Belem, PA, Brazil. juarez@ufpa.br
authors.forename: Juarez Antonio Simões
authors.initials: JA
authors.lastname: Quaresma
authors.forename: Vera Lucia Reis Souza
authors.initials: VL
authors.lastname: Barros
authors.forename: Elaine Rainero
authors.initials: ER
authors.lastname: Fernandes
authors.forename: Carla
authors.initials: C
authors.lastname: Pagliari
authors.forename: Cleusa
authors.initials: C
authors.lastname: Takakura
authors.forename: Pedro Fernando
authors.initials: PF
authors.lastname: da Costa Vasconcelos
authors.forename: Heitor Franco
authors.initials: HF
authors.lastname: de Andrade
authors.forename: Maria Irma Seixas
authors.initials: MI
authors.lastname: Duarte
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000956:Antigens, Viral / Q000032:analysis; D017209:Apoptosis; D002648:Child; D002675:Child, Preschool; D005234:Fatty Liver / Q000473:pathology / Q000821:virology; D005260:Female; D022781:Hepatocytes / Q000473:pathology / Q000648:ultrastructure / Q000821:virology; D006801:Humans; D007150:Immunohistochemistry; D008099:Liver / Q000378:metabolism / Q000473:pathology*; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D015004:Yellow Fever / Q000473:pathology* / Q000821:virology; D015005:Yellow fever virus / Q000254:growth & development*
chemical_list: D000956:Antigens, Viral