Format

Send to:

Choose Destination
See comment in PubMed Commons below
Gastroenterology. 2011 Mar;140(3):830-9. doi: 10.1053/j.gastro.2010.09.010. Epub 2010 Sep 17.

S-adenosyl methionine improves early viral responses and interferon-stimulated gene induction in hepatitis C nonresponders.

Author information

  • 1Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-1800, USA.

Abstract

BACKGROUND & AIMS:

Less than half of patients infected with hepatitis C virus (HCV) achieve sustained viral clearance after pegylated interferon (peginterferon) and ribavirin therapy. S-adenosyl methionine (SAMe) improves interferon signaling in cell culture. We assessed the effect of SAMe on the kinetics of the early antiviral response and interferon signaling in nonresponders to previous antiviral therapy and investigated the mechanisms involved.

METHODS:

Nonresponders with HCV genotype 1 were given peginterferon alfa-2a and ribavirin for 2 weeks (course A, baseline/control). After 1 month, patients received SAMe (1600 mg daily) for 2 weeks and then peginterferon and ribavirin for 48 weeks (course B; completed by 21 of 24 patients). Viral kinetics and interferon-stimulated gene (ISG) expression in peripheral blood mononuclear cells (PBMCs) were compared between courses.

RESULTS:

The decrease in HCV RNA from 0 to 48 hours (phase 1) was similar with and without SAMe. However, the second phase slope of viral decline was improved with SAMe (course A, 0.11 ± 0.04 log(10) IU/mL/wk; course B, 0.27 ± 0.06; P = .009); 11 patients (53%) achieved an early virological response, and 10 (48%) had undetectable HCV RNA by week 24. Induction of ISGs in PBMCs was significantly greater during course B. In cultured cells, SAMe increased induction of ISGs and the antiviral effects of interferon by increasing STAT1 methylation, possibly affecting STAT1-DNA binding.

CONCLUSIONS:

The addition of SAMe to peginterferon and ribavirin improves the early viral kinetics and increases ISG induction in nonresponders to previous therapy. SAMe might be a useful adjunct to peginterferon-based therapies in chronic HCV infection.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT00475176.

Copyright © 2011 AGA Institute. Published by Elsevier Inc. All rights reserved.

PMID:
20854821
[PubMed - indexed for MEDLINE]
PMCID:
PMC3021477
Free PMC Article

Publication Types, MeSH Terms, Substances, Secondary Source ID, Grant Support

Publication Types

MeSH Terms

Substances

Secondary Source ID

Grant Support

PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science Icon for PubMed Central
    Loading ...
    Write to the Help Desk