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Related Experiment Video

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CD28 aptamers as powerful immune response modulators.

Fernando Pastor1, Mario M Soldevilla, Helena Villanueva

  • 1Laboratory of Immunotherapy, Oncology Division, Center for Applied Medical Research, University of Navarra, Pamplona, Spain.

Molecular Therapy. Nucleic Acids
|June 13, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed novel aptamers targeting CD28, a T cell receptor. These aptamers can block or enhance immune responses, offering dual functionality for cancer immunotherapy applications.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Biotechnology

Background:

  • CD28 is a crucial costimulatory receptor for T lymphocyte activation.
  • The interaction between CD28 and its ligand B7 is vital for immune responses.
  • Modulating CD28 signaling holds therapeutic potential in immunotherapy.

Purpose of the Study:

  • To isolate and characterize aptamers that bind to the CD28 receptor.
  • To investigate the potential of these aptamers as agonists or antagonists of CD28 signaling.
  • To evaluate the in vivo efficacy of CD28 aptamers in enhancing immune responses and prolonging survival.

Main Methods:

  • Isolation of aptamers binding to CD28.
  • Assessment of aptamer monomer and dimer functions in blocking or providing costimulation.
  • Engineering of agonistic aptamer structures.
  • In vivo studies using aptamers in combination with an idiotype vaccine against lymphoma.

Main Results:

  • Two aptamers binding to CD28 were identified.
  • Aptamer monomers could inhibit CD28-B7 interaction, while dimers provided artificial costimulation.
  • Engineered agonistic aptamers demonstrated superior costimulatory properties compared to an anti-CD28 antibody.
  • In vivo administration of agonistic aptamers enhanced anti-lymphoma immune response and prolonged mouse survival.

Conclusions:

  • CD28 aptamers possess dual functionality, acting as antagonists or agonists.
  • Engineered CD28 aptamers can effectively enhance vaccine-induced immune responses.
  • These aptamers represent a promising tool for modulating immune responses in cancer immunotherapy.