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Safety and Immunogenicity of a Naked DNA-based Vaccine Therapy in Patients With Chronic Hepatitis B

2014-07-23 21:12:36 | BioPortfolio

Summary

The purpose of this study was to investigate whether HBV-DNA vaccination is safe and could restore immune responses in patients with chronic hepatitis B non responder to available therapies.

Description

- Despite the availability of effective hepatitis B vaccines for many years, over 370 million people remain persistently infected with hepatitis B virus (HBV). Persistent infection is associated with chronic liver disease that can lead to the development of cirrhosis and hepatocellular carcinoma in some patients. Viral persistence is thought to be related to poor HBV-specific immune responses.

- Interferon (IFN)-alpha treatment significantly decreases HBV replication in only one third of patients with hepatitis B e antigen (HBeAg)-positive chronic active hepatitis B. Nucleoside analogues, such as lamivudine and adefovir dipivoxil, inhibit HBV replication and improve histological signs of liver disease,but their use is limited by the risk of relapse after treatment discontinuation and the emergence of drug-resistant viral variants.

- Patients with acute self-limited hepatitis B display detectable polyclonal and multispecific cytotoxic T lymphocyte and T helper (Th) responses to viral antigens,whereas these responses are weak or absent in chronic HBV carriers.

- Increasing the strength of HBV-specific T-cell responses to the levels found in patients recovering from infection is therefore a goal in the treatment of patients with chronic hepatitis.

- Immunization with a nucleic acid vaccine (DNA vaccine) usually elicits antibody responses and T lymphocytes with a Th1 cytokine profile. In animal models of chronic hepatitis B infection, including nonhuman primates, intramuscular injection of a plasmid encoding HBV envelope proteins induces rapid, strong, and sustained humoral and cell-mediated immune responses. Clinical trials of DNA vaccines for hepatitis B conducted in healthy adult volunteers using a plasmid encoding hepatitis B surface antigen and the gene gun as a delivery system showed good tolerance.

- We carried out a phase I trial of a HBV DNA vaccine in patients with chronic active viral hepatitis, aiming to restore HBV-specific immune responses and to assess safety regarding liver disease.

Study Design

Control: Uncontrolled, Endpoint Classification: Safety Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment

Conditions

Chronic Hepatitis B

Intervention

DNA vaccine

Location

Service d'Hepatologie, Hopital Necker Enfants Malades
Paris
France
75015

Status

Completed

Source

Institut National de la Santé Et de la Recherche Médicale, France

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-07-23T21:12:36-0400

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Medical and Biotech [MESH] Definitions

INFLAMMATION of the LIVER in humans that is caused by HEPATITIS C VIRUS lasting six months or more. Chronic hepatitis C can lead to LIVER CIRRHOSIS.

Any vaccine raised against any virus or viral derivative that causes hepatitis.

INFLAMMATION of the LIVER with ongoing hepatocellular injury for 6 months or more, characterized by NECROSIS of HEPATOCYTES and inflammatory cell (LEUKOCYTES) infiltration. Chronic hepatitis can be caused by viruses, medications, autoimmune diseases, and other unknown factors.

INFLAMMATION of the LIVER in humans caused by HEPATITIS DELTA VIRUS in conjunction with HEPATITIS B VIRUS and lasting six months or more.

A closely related group of antigens found in the plasma only during the infective phase of hepatitis B or in virulent chronic hepatitis B, probably indicating active virus replication; there are three subtypes which may exist in a complex with immunoglobulins G.

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