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Title: Influence of Hepatitis C Virus Sustained Virological Response on Immunosuppressive Tryptophan Catabolism in ART-Treated HIV/HCV Coinfected Patients
Autores: Jenabian, M.
Mehraj, V.
Costiniuk, C.
Vyboh, K.
Kema, I.
Rollet, K.
Paulino-Ramírez, Robert
Klein, M.
Routy, J. P.
Researchers (UNIBE): Paulino-Ramírez, Robert 
Affiliations: Instituto de Medicina Tropical y Salud Global (IMTSAG) 
Research area: Ciencias de la Salud
Keywords: Indoleamine 2,3-dioxygenase 1; Tryptophan; HIV; HCV; Co-infection; Inflammation
Issue Date: 2016
Source: Journal of Acquired Immune Deficiency Syndromes, 71(3), 254-262
Journal: JAIDS : Journal of Acquired Immune Deficiency Syndromes 
Volume: 71
Issue: 3
Start page: 254
End page: 262
Background: We previously reported an association between tryptophan (Trp) catabolism and immune dysfunction in HIV monoinfection. Coinfection with HIV is associated with more rapid evolution of hepatitis C virus (HCV)-associated liver disease despite antiretroviral therapy (ART), possibly due to immune dysregulation. We hypothesized that liver fibrosis in HIV/HCV coinfection would be associated with immune dysfunction and alterations in Trp metabolism. Methods: Trp catabolism and inflammatory soluble markers were assessed in plasma samples from ART-treated HIV/HCV-coinfected patients (n = 90) compared with ART-treated HIV-monoinfected patients and noninfected subjects. Furthermore, 17 additional coinfected patients with sustained virological response (SVR) were assessed longitudinally 6 months after completion of interferon-α/ribavirin treatment. Results: HIV/HCV patients had higher Trp catabolism compared with HIV-monoinfected and healthy individuals. Elevated kynurenine levels in HIV/HCV patients with liver fibrosis correlated with the prognostic aspartate aminotransaminase to platelet ratio (APRI scores) and insulin levels. Furthermore, HIV/HCV patients had elevated levels of disease progression markers interleukin-6 and induced protein 10 and shared similar levels of markers of microbial translocation (intestinal fatty acid-binding protein, soluble CD14 and lipopolysaccharide-binding protein) compared with HIV-monoinfected and healthy individuals. Successful HCV treatment improved APRI score and markers of disease progression and microbial translocation although elevated Trp catabolism remained unchanged 6 months after SVR. Conclusion: ART-treated HIV/HCV-coinfected patients had elevated immunosuppressive Trp catabolism when compared with monoinfected HIV-treated patients, which did not normalize after SVR. These findings suggest that a necroinflammatory liver syndrome persists through inflammation by Trp catabolism after 6 month of SVR.
DOI: 10.1097/QAI.0000000000000859
Appears in Collections:Publicaciones del IMTSAG-UNIBE
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