Related Experiment Video
Updated: Jun 27, 2026
11:20
Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells
Published on: June 3, 2012
Autophagy is involved in influenza A virus replication
Zhi Zhou1, Xuejun Jiang, Di Liu
1College of Veterinary Medicine, China Agricultural University, Beijing, China.
Autophagy
|December 11, 2008
Summary
Autophagy, a cellular process, supports influenza A virus replication. Inhibiting autophagy significantly reduces viral titers and impairs viral protein accumulation, highlighting its crucial role.
Area of Science:
- Cellular Biology
- Virology
- Molecular Biology
Background:
- Autophagy plays a role in the replication of certain viruses, particularly those assembling on cytoplasmic membranes.
- The specific regulatory role of autophagy in influenza A virus replication remains largely uncharacterized.
Purpose of the Study:
- To investigate the involvement and regulatory role of autophagy in the replication cycle of influenza A virus.
Main Methods:
- Utilized fluorescence and electron microscopy to observe autophagosome formation during influenza A virus infection.
- Employed pharmacological inhibitors (3-methylademine, wortmannin) and RNA interference to modulate autophagy.
- Assessed viral titers, autophagosome marker protein LC3-II levels, autophagic flux, viral protein accumulation, virus entry, and cell viability.
Main Results:
- Influenza A virus infection induced autophagosomes and increased microtubule-associated protein light chain 3-II (LC3-II) levels, indicating enhanced autophagic flux.
- Pharmacological inhibition and RNA interference-mediated depletion of autophagy-related proteins significantly decreased influenza A virus titers.
- Autophagy inhibition did not affect virus entry or host cell viability.
- Impaired cellular autophagy led to reduced viral protein accumulation.
Conclusions:
- Autophagy is actively involved in and supports the replication of influenza A virus.
- Modulating autophagy presents a potential strategy for controlling influenza A virus infection.
Related Concept Videos
02:28Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
01:27Influenza
Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
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...
01:30Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
01:27Autophagy
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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...