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Related Concept Videos

Hepatitis01:25

Hepatitis

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Immunodeficiency Diseases01:25

Immunodeficiency Diseases

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency...
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Retrovirus Life Cycles01:10

Retrovirus Life Cycles

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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

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Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion...
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Sexually Transmitted Infections01:26

Sexually Transmitted Infections

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Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...
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Related Experiment Video

Updated: Apr 19, 2026

Stem Cell-Derived Viral Ag-Specific T Lymphocytes Suppress HBV Replication in Mice
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Stem Cell-Derived Viral Ag-Specific T Lymphocytes Suppress HBV Replication in Mice

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Human immunodeficiency virus coinfection with hepatitis B virus leads to a decrease in extracellular and

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HIV infection significantly reduces hepatitis B virus (HBV) replication markers in liver cells. This occurs via the HIV Rev protein, offering insights into HIV-HBV coinfection

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Area of Science:

  • Hepatology
  • Virology
  • Immunology

Background:

  • Chronic hepatitis B virus (HBV) infection accelerates liver disease in HIV-positive individuals.
  • HIV's impact on HBV-specific T cell responses is known, but virological and molecular details of coinfection remain unclear.
  • Lack of suitable model systems hinders understanding of HIV-HBV coinfection.

Purpose of the Study:

  • To investigate the effect of human immunodeficiency virus (HIV) infection on the hepatitis B virus (HBV) life cycle.
  • To explore the role of HIV proteins in modulating HBV replication and antigen expression.

Main Methods:

  • Utilized an in vitro model system using HepG2 cells.
  • Co-transfected cells with HIV NL4-3 and pHBV1.3 plasmids.
  • Investigated the role of HIV Rev protein in modulating HBV gene expression.

Main Results:

  • Co-transfection with HIV NL4-3 significantly decreased extracellular and intracellular hepatitis B surface antigen (HBsAg) and e antigen (HBeAg) levels.
  • HBV DNA and mRNA expression were significantly reduced in co-transfected cells.
  • HIV Rev protein markedly reduced HBsAg and HBeAg expression by mediating HBV mRNA expression, without affecting HBV promoters or mRNA nuclear export.

Conclusions:

  • HIV infection, specifically through the Rev protein, suppresses HBV replication and antigen production in vitro.
  • These findings provide a molecular basis for understanding the complex interactions in HIV-HBV coinfection.
  • The study offers potential insights into the accelerated liver disease progression observed in coinfected patients.