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Related Concept Videos

Viral Structure00:56

Viral Structure

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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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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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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Viral Recombination00:57

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Protein Complex Assembly02:41

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Virus-like structures for combination antigen protein mRNA vaccination.

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This study introduces a novel virus-like particle vaccine system that effectively delivers mRNA and protein antigens. This enhanced delivery system significantly boosts antibody responses, offering a promising approach for improved vaccination strategies against viral threats.

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Area of Science:

  • Immunology and Vaccinology
  • Nanotechnology in Medicine
  • Virology and Infectious Diseases

Background:

  • Effective vaccination necessitates advanced antigen delivery systems and robust immune activation.
  • Current vaccine technologies face challenges in optimizing antigen presentation and eliciting broad immune responses.
  • The emergence of SARS-CoV-2 variants highlights the need for adaptable and potent vaccine platforms.

Purpose of the Study:

  • To develop and evaluate a novel lipid nanoparticle-based virus-like particle (VLP) system for enhanced antigen delivery.
  • To investigate the VLP system's capacity to deliver both mRNA and protein antigens, specifically targeting SARS-CoV-2 variants.
  • To assess the immune response generated by the combined mRNA-protein VLP vaccine compared to single-component vaccines.

Main Methods:

  • Engineered lipid nanoparticles decorated with SARS-CoV-2 spike proteins (Omicron BA.1 S1) to form VLPs.
  • Utilized VLPs to co-deliver mRNA encoding the S1 protein of a different SARS-CoV-2 variant (XBB.1) and S1 protein itself.
  • Assessed VLP interaction with human respiratory epithelial cells and macrophages via ACE2 and DC-SIGN receptors.
  • Evaluated macrophage and dendritic cell activation through receptor binding.
  • Measured antibody responses in BALB/c mice following vaccination with the VLP system, mRNA alone, or protein alone.

Main Results:

  • The VLP system successfully carried and delivered both mRNA and protein antigens.
  • Surface S1 protein on VLPs facilitated targeted delivery and enhanced mRNA expression in specific immune cells.
  • Receptor binding (ACE2, DC-SIGN) mediated by surface S1 protein activated macrophages and dendritic cells.
  • The combined mRNA-protein VLP vaccine elicited a significantly higher antibody response in mice compared to monovalent mRNA or protein vaccines.
  • Immune response mechanisms suggested cross-presentation to diverse dendritic cell subsets, bridging innate and adaptive immunity.

Conclusions:

  • The developed VLP system represents a potent platform for co-delivering mRNA and protein antigens, enhancing vaccine efficacy.
  • Targeted delivery and immune cell activation via specific receptor interactions contribute to the robust immune response.
  • This strategy holds promise for developing next-generation vaccines against SARS-CoV-2 variants and potentially other infectious diseases.