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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Tumor Immunotherapy01:27

Tumor Immunotherapy

Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.

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Related Experiment Video

Updated: Jul 3, 2026

High-Efficiency Generation of Antigen-Specific Primary Mouse Cytotoxic T Cells for Functional Testing in an Autoimmune Diabetes Model
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Immunochemical termination of self-tolerance.

Jan Grünewald1, Meng-Lin Tsao, Roshan Perera

  • 1Department of Chemistry, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 8, 2008
PubMed
Summary

Researchers developed a novel method to generate high-titer antibodies against specific protein targets. By incorporating an unnatural amino acid, they successfully elicited cross-reactive antibodies that neutralize harmful proteins, advancing vaccine development for diseases like cancer and infections.

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Area of Science:

  • Immunology
  • Protein Engineering
  • Vaccine Development

Background:

  • Inducing targeted immune responses against self-proteins or foreign antigens is crucial for developing effective vaccines.
  • Current methods face challenges in generating high-titer, specific antibodies for therapeutic applications.

Purpose of the Study:

  • To investigate the potential of site-specific incorporation of unnatural amino acids to enhance protein immunogenicity.
  • To develop a generalizable strategy for generating neutralizing antibodies against specific protein epitopes.

Main Methods:

  • Site-specific mutation of murine tumor necrosis factor-alpha (mTNF-alpha) at Tyr(86) to p-nitrophenylalanine (pNO(2)Phe).
  • Immunization of mice with the modified mTNF-alpha to assess antibody response.
  • Evaluation of antibody cross-reactivity with wild-type (WT) mTNF-alpha and protective efficacy against LPS-induced death.

Main Results:

  • Incorporation of pNO(2)Phe at Tyr(86) of mTNF-alpha induced a high-titer antibody response in mice.
  • Antibodies generated against pNO(2)Phe-mTNF-alpha showed significant cross-reactivity with native mTNF-alpha.
  • The generated antibodies conferred protection against lipopolysaccharide (LPS)-induced mortality in mice.

Conclusions:

  • Site-specific incorporation of immunogenic unnatural amino acids is an effective strategy to generate high-titer antibodies against specific protein epitopes.
  • This approach holds promise for developing novel vaccines against cancer, protein-misfolding diseases, and infectious agents.
  • The method offers a generalizable platform for eliciting neutralizing immune responses to self- and foreign antigens.