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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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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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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...
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Pregnancy serum facilitates hepatitis E virus replication in vitro.

Yanhong Bi1, Chenchen Yang1, Wenhai Yu2

  • 1Medical Faculty, Kunming University of Science and Technology, 727 Jingming Road, Kunming, PR China.

The Journal of General Virology
|January 24, 2015
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Pregnancy serum worsens Hepatitis E virus (HEV) infection in pregnant women by suppressing estrogen receptors and type I interferon, particularly in the third trimester. This delayed immune response may facilitate viral replication.

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Area of Science:

  • Virology
  • Immunology
  • Obstetrics

Background:

  • Hepatitis E virus (HEV) infection poses a significant mortality risk to pregnant women.
  • The precise mechanisms driving HEV pathogenesis in pregnancy are not well understood.

Purpose of the Study:

  • To investigate the influence of pregnancy serum on HEV infection dynamics.
  • To elucidate the role of estrogen receptors and type I interferon in HEV pathogenesis during pregnancy.

Main Methods:

  • Utilized an efficient cell culture system to model HEV infection.
  • Supplemented cells with pregnancy serum from different trimesters.
  • Assessed the activation status of estrogen receptors (ER-α, ER-β).
  • Quantified the expression levels of type I interferon (IFN-β).

Main Results:

  • Pregnancy serum, especially from the third trimester, exacerbated HEV infection.
  • Estrogen receptors were activated by pregnancy serum but inhibited during HEV infection.
  • Type I interferon (IFN-β) showed delayed upregulation in HEV-infected cells with third-trimester serum.
  • Delayed IFN-β expression correlated with increased viral replication.

Conclusions:

  • Pregnancy serum accelerates HEV replication by suppressing estrogen receptors and type I interferon.
  • These suppressive effects, particularly the delayed IFN-β response, may be a key factor in severe HEV outcomes during pregnancy.