Molecular Mechanism for Protection Against Liver Failure in Human Yellow Fever Infection

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Lemos, Fernanda de Oliveira ^[1] ; Franca, Andressa ^[1] ; Melo Lima Filho, Antonio Carlos ^[1] ; Florentino, Rodrigo M. ^[1] ; Santos, Marcone Loiola ^[1] ; Missiaggia, Dabny G. ^[1] ; Libanio Rodrigues, Gisele Olinto ^[2] ; Dias, Felipe Ferraz ^[3] ; Souza Passos, Ingredy Beatriz ^[4] ; Teixeira, Mauro M. ^[2] ; de Faria Andrade, Antonio Marcio ^[5] ; Lima, Cristiano Xavier ^{[5, 6]} ; Teixeira Vidigal, Paula Vieira ^[7] ; Costa, Vivian Vasconcelos ^[4] ; Fonseca, Matheus Castro ^[8] ; Nathanson, Michael H. ^[9] ; Leite, M. Fatima ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Minas Gerais, Dept Physiol & Biophys, Belo Horizonte, MG - Brazil

^[2] Univ Fed Minas Gerais, Dept Biochem & Immunol, Belo Horizonte, MG - Brazil

^[3] Univ Fed Minas Gerais, Ctr Microscopy, Belo Horizonte, MG - Brazil

^[4] Univ Fed Minas Gerais, Dept Morphol, Belo Horizonte, MG - Brazil

^[5] Hosp Felicio Rocho, Hepat Transplant Serv, Belo Horizonte, MG - Brazil

^[6] Univ Fed Minas Gerais, Surg, Belo Horizonte, MG - Brazil

^[7] Univ Fed Minas Gerais, Pathol Anat & Forens Med, Belo Horizonte, MG - Brazil

^[8] Brazilian Ctr Res Energy & Mat, Brazilian Biosci Natl Lab LNBio, Rua Giuseppe Maximo Scolfaro, Campinas - Brazil

^[9] Yale Univ, Dept Internal Med, Sect Digest Dis, Sch Med, 300 Cedar St, TAC S241D, New Haven, CT 06520 - USA

• Tipo de documento: Artigo Científico
• Fonte: HEPATOLOGY COMMUNICATIONS; v. 4, n. 5, p. 657-669, MAY 2020.
• Citações Web of Science: 1

Resumo

Yellow fever (YF) is a viral hemorrhagic fever that typically involves the liver. Brazil recently experienced its largest recorded YF outbreak, and the disease was fatal in more than a third of affected individuals, mostly because of acute liver failure. Affected individuals are generally treated only supportively, but during the recent Brazilian outbreak, selected patients were treated with liver transplant. We took advantage of this clinical experience to better characterize the clinical and pathological features of YF-induced liver failure and to examine the mechanism of hepatocellular injury in YF, to identify targets that would be amenable to therapeutic intervention in preventing progression to liver failure and death. Patients with YF liver failure rapidly developed massive transaminase elevations, with jaundice, coagulopathy, thrombocytopenia, and usually hepatic encephalopathy, along with pathological findings that included microvesicular steatosis and lytic necrosis. Hepatocytes began to express the type 3 isoform of the inositol trisphosphate receptor (ITPR3), an intracellular calcium (Ca2+) channel that is not normally expressed in hepatocytes. Experiments in an animal model, isolated hepatocytes, and liver-derived cell lines showed that this new expression of ITPR3 was associated with increased nuclear Ca2+ signaling and hepatocyte proliferation, and reduced steatosis and cell death induced by the YF virus. Conclusion: Yellow fever often induces liver failure characterized by massive hepatocellular damage plus steatosis. New expression of ITPR3 also occurs in YF-infected hepatocytes, which may represent an endogenous protective mechanism that could suggest approaches to treat affected individuals before they progress to liver failure, thereby decreasing the mortality of this disease in a way that does not rely on the costly and limited resource of liver transplantation. (AU)

• Processo FAPESP: 18/20014-0 - Conectando o intestino e o cérebro: envolvimento do microbioma intestinal no surgimento e progressão da doença de Parkinson esporádica
• Beneficiário: Matheus de Castro Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Regular