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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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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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Related Experiment Video

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Stem Cell-Derived Viral Ag-Specific T Lymphocytes Suppress HBV Replication in Mice
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Adaptive immunity in HBV infection.

Antonio Bertoletti1, Carlo Ferrari2

  • 1Emerging Infectious Diseases (EID) Program, Duke-NUS Medical School, Singapore; Viral Hepatitis Laboratory, Singapore Institute for Clinical Sciences, Agency of Science Technology and Research (A*STAR), Singapore.

Journal of Hepatology
|April 17, 2016
PubMed
Summary

Hepatitis B virus (HBV) infection outcomes depend on HBV-specific B cells and T cells. This review summarizes HBV adaptive immunity, discusses B and T cell response uncertainties, and suggests new immunotherapies.

Keywords:
Antiviral immunityB lymphocytesImmunodominanceT cell exhaustionT lymphocytes

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Area of Science:

  • Immunology
  • Virology
  • Hepatology

Background:

  • Hepatitis B virus (HBV) infection outcome is determined by the host's adaptive immune response.
  • Functional HBV-specific B cells producing antibodies and T cells (helper and cytotoxic) are crucial for viral clearance or chronicity.

Purpose of the Study:

  • To review the current understanding of adaptive immunity during HBV infection.
  • To highlight existing controversies and knowledge gaps in HBV-specific B and T lymphocyte responses.
  • To propose future research directions for developing improved immunotherapeutic strategies against HBV.

Main Methods:

  • This study is a review of existing literature on HBV adaptive immunity.
  • It synthesizes current knowledge on B and T cell responses in HBV infection.
  • It identifies areas of debate and uncertainty in the field.

Main Results:

  • The adaptive immune response, involving B and T lymphocytes, plays a pivotal role in determining the outcome of HBV infection.
  • There are ongoing debates and uncertainties regarding the precise mechanisms and efficacy of HBV-specific B and T cell responses.
  • Understanding these immune responses is key to developing effective treatments.

Conclusions:

  • Further research into HBV-specific B and T cell immunity is essential.
  • Addressing current controversies will pave the way for more effective immunotherapies.
  • The ultimate goal is to enhance strategies for managing and potentially curing HBV infection.