Related Experiment Video
Updated: Aug 12, 2026
11:14
Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
Published on: November 7, 2018
Pathobiology of hepatitis delta virus
1Division of Gastroenterology, Molinette Hospital, Turin, Italy.
Journal of Hepatology
|January 1, 1993
Summary
Hepatitis delta is not solely caused by direct cell damage. Liver injury involves multiple factors including the hepatitis delta virus replication, co-infecting hepadnavirus, and host immune responses.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- Hepatitis delta virus (HDV) was initially thought to cause liver damage primarily through direct cytotoxicity.
- This understanding has evolved with new clinical and experimental data.
Purpose of the Study:
- To reassess the pathogenetic mechanisms of liver damage in HDV infection.
- To explore the multifactorial nature of HDV-associated liver disease.
Main Methods:
- Review of early human observations and chimpanzee infectivity studies.
- Analysis of data from liver transplant patients.
- Integration of experimental and clinical evidence.
Main Results:
- Liver damage in HDV infection is not solely due to direct cytotoxic effects.
- Multiple factors contribute to the pathogenesis of hepatitis delta.
- Clinical presentations are influenced by HDV replication, co-infecting hepadnavirus characteristics, and host immune responses.
Conclusions:
- The pathogenetic model for hepatitis delta requires a multifactorial approach.
- Understanding HDV requires considering viral replication, helper virus interactions, and host immunity.
- This comprehensive view explains the diverse clinical outcomes observed in patients.
Related Concept Videos
01:29Viruses with RNA Genomes
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
01:29Subviral Agents
Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
01:18Yellow Fever
Yellow fever is a viral hemorrhagic disease caused by the yellow fever virus (YFV), a member of the Flaviviridae family. It is transmitted primarily by Aedes and Haemagogus mosquitoes in tropical and subtropical regions of Africa and South America. After transmission through a mosquito bite, the virus initially replicates in skin-resident immune cells such as dendritic cells and macrophages. These cells then migrate to the lymph nodes, where viral replication increases, eventually leading to...
01:25Hepatitis
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. The...
01:28Viral Hepatitis I: Introduction
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 of food...
01:24Cirrhosis II: Pathophysiology
Cirrhosis is a progressive chronic liver injury caused by prolonged inflammation, excessive fibrotic remodeling, and impaired regeneration. Over time, repeated hepatic insults disrupt the liver’s architecture and function, leading to reduced blood flow, impaired bile drainage, and diminished metabolic capacity.Pathophysiology of cirrhosisCirrhosis arises from three main responses to chronic liver damage: inflammation, immune activation, and hepatocyte death. These processes lead to structural...