Related Experiment Video
Updated: Aug 6, 2026
09:35
Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
Published on: February 1, 2017
Involvement of endoplasmic reticulum in hepatitis B virus replication
Weiliang Xia1, Yan Shen, Haiyang Xie
1Key Laboratory of Combined Multi-organ Transplantation, Ministry of Public Health, Department of Hepatobiliary Pancreatic Surgery, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, PR China. doctorxwl@163.com
Virus Research
|July 28, 2006
Summary
The endoplasmic reticulum (ER) regulates calcium, impacting hepatitis B virus (HBV) replication via the calcium-PyK2 pathway. ER calcium channels, specifically ER Ca2+-ATPase and IP3R, are key targets for inhibiting HBV replication.
Area of Science:
- Hepatology
- Molecular Biology
- Virology
Background:
- Mitochondrial calcium and proline-rich tyrosine kinase-2 (PyK2) signaling are crucial for hepatitis B virus (HBV) replication.
- The endoplasmic reticulum (ER) is vital for intracellular calcium homeostasis.
Purpose of the Study:
- To investigate the role of the ER in HBV replication.
- To determine if ER calcium channels influence HBV replication through the calcium-PyK2 pathway.
Main Methods:
- HBV-transfected HepG2.2.15 cells were treated with calcium channel blockers (CsA, CPA, ryanodine, U73122).
- HBV replication was assessed using slot blot hybridization and real-time PCR.
- PyK2 kinase activation was measured by Western blot analysis.
Main Results:
- Blocking ER Ca2+-ATPase (with CPA) and ER IP3R (with U73122) inhibited HBV replication and PyK2 phosphorylation.
- Blocking mitochondrial permeability transition pore (with CsA) also inhibited HBV replication and PyK2 phosphorylation.
- Blocking the ER ryanodine receptor (with ryanodine) did not affect HBV replication or PyK2 phosphorylation.
Conclusions:
- The ER participates in HBV replication through the calcium-PyK2 signaling pathway.
- ER Ca2+-ATPase and ER IP3R calcium channels are critical mediators of this process.
- ER-mitochondria interactions may be involved in HBV replication.
Related Concept Videos
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...
01:29Viruses 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...
01:28Viral 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...
01:25Inhibitors Of Virion Release
Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
01:10Retrovirus Life Cycles
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 retrovirus to...
01:17Role of ER in the Secretory Pathway
Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...