Studio immunologico per l'individuazione di pazienti trapiantati per cirrosi HBV relata che potrebbero sospedere la terapia con immunoglobine specifiche (HBIG)

Riili, Anna (2009) Studio immunologico per l'individuazione di pazienti trapiantati per cirrosi HBV relata che potrebbero sospedere la terapia con immunoglobine specifiche (HBIG), [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Fisiologia applicata e fisiopatologia, 21 Ciclo.
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Abstract

Hepatitis B virus (HBV) recurrence after orthotopic liver transplantation (OLT) is associated with poor graft and patient survival. Treatment with HBV-specific immunoglobulins (HBIG) in combination with nucleos(t)ide analogs is effective in preventing HBV reinfection of the graft and improving OLT outcome. However, the combined immunoprophylaxis has several limitations, mainly the high cost and the lack of standard schedules about duration. So far, the identification of markers able to predict the reinfection risk is needed. Although the HBV-specific immune response is believed to play an essential role in disease outcome, HBV-specific cellular immunity in viral containment in OLT recipients is unclear. To test whether or not OLT recipients maintain robust HBV-specific cellular immunity, the cellular immune response against viral nucleocapsid and envelope-protein of HBV was assessed in 15 OLT recipients and 27 individuals with chronic and 24 subjects with self-limited HBV infection, respectively. The data demonstrate that OLT recipients mounted fewer but stronger clusters of differentiation (CD)8 T cell responses than subjects with self-limited HBV infection and showed a preferential targeting of the nucleocapsid antigen. This focused response pattern was similar to responses seen in chronically infected subjects with undetectable viremia, but significantly different from patients who presented with elevated HBV viremia and who mounted mainly immune responses against the envelope protein. In conclusion, virus-specific CD4 T cell–mediated responses were only detected in subjects with self-limited HBV infection. Thus, the profile of the cellular immunity against HBV was in immune suppressed patients similar to subjects with chronic HBV infection with suppressed HBV-DNA.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Riili, Anna
Supervisore
Dottorato di ricerca
Scuola di dottorato
Scienze mediche e chirurgiche cliniche
Ciclo
21
Coordinatore
Settore disciplinare
Settore concorsuale
URN:NBN
Data di discussione
18 Maggio 2009
URI

Altri metadati

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