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Influenza01:27

Influenza

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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...
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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...
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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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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...
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Influenza A Virus Infection Induces Preferential Increases in Long-Chain Ceramides.

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Area of Science:

  • Virology
  • Biochemistry
  • Cell Biology

Background:

  • Influenza A virus (IAV) poses a significant global health challenge.
  • Understanding IAV-host interactions is crucial for developing effective treatments.
  • Ceramides, a class of host sphingolipids, are known to influence viral infections.

Purpose of the Study:

  • To investigate the impact of IAV infection on specific ceramide species in human respiratory cells.
  • To quantify changes in ceramide profiles during IAV infection.

Main Methods:

  • Utilized ultra-high-performance liquid chromatography-mass spectrometry (UHPLC-MS) for precise ceramide measurement.
  • Analyzed ceramide species ranging from C14 to C26 in A549 lung epithelial cells and primary tracheal epithelial cells.

Main Results:

  • C16-ceramide and C24-ceramide are the predominant species (~80%) in human respiratory epithelial cells.
  • IAV infection induced a significant shift in ceramide abundance: C16-ceramide decreased, while C24-ceramide increased.
  • Multiple long-chain ceramides showed increased levels following IAV infection.

Conclusions:

  • IAV infection disrupts the ceramide system in human respiratory cells.
  • These findings provide insights into ceramide metabolism during influenza infection.
  • Understanding these host-pathogen interactions may aid in developing novel therapeutic strategies.