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Antigen Presenting Cells01:22

Antigen Presenting Cells

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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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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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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In Situ Polymerization-Mediated Antigen Presentation.

Chao Pan1, Lu Wang1, Mengmeng Zhang1

  • 1Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Institute of Molecular Medicine, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China.

Journal of the American Chemical Society
|June 1, 2023
PubMed
Summary
This summary is machine-generated.

A novel in situ polymerization-mediated antigen presentation (IPAP) method enhances adaptive immunity by anchoring nanovaccines to dendritic cells. This approach improves antigen presentation and elicits robust immune responses for disease immunization.

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Area of Science:

  • Immunology
  • Nanotechnology
  • Biomaterials

Background:

  • Adaptive immunity relies on effective antigen-presenting cell activation.
  • Conventional strategies often show suboptimal antigen-specific priming.
  • There is a need for improved methods to enhance antigen presentation and immune responses.

Purpose of the Study:

  • To develop and evaluate in situ polymerization-mediated antigen presentation (IPAP) for enhanced adaptive immunity.
  • To investigate IPAP's mechanism in improving antigen presentation by dendritic cells.
  • To assess IPAP's efficacy in eliciting antigen-specific immune responses against tumors and viral antigens.

Main Methods:

  • Development of antigen-loaded nanovaccines formed via in situ polymerization with dopamine.
  • In vivo anchoring of nanovaccines onto dendritic cells.
  • Evaluation of antigen uptake, degradation, and presentation.
  • Assessment of immune responses, including cellular and humoral immunity, in murine models.
  • Testing IPAP with ovalbumin and SARS-CoV-2 Spike protein S1 subunit.

Main Results:

  • IPAP spontaneously forms nanovaccines that anchor to dendritic cells in vivo.
  • Chemically bound nanovaccines enhance macropinocytosis and reduce antigen degradation.
  • IPAP prolongs antigen retention at the injection site and improves lymph node accumulation.
  • Significant protective immunity against ovalbumin-expressing tumors was observed.
  • Increased production of S1-specific immunoglobulin G was achieved using the SARS-CoV-2 Spike protein S1 subunit.

Conclusions:

  • IPAP offers a facile and versatile strategy for stimulating antigen-presenting cells.
  • This method effectively boosts antigen-specific adaptive immune responses.
  • IPAP presents a promising approach for immunization against various diseases.