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Updated: Jul 30, 2025

Ultrasound-Guided Orthotopic Implantation of Murine Pancreatic Ductal Adenocarcinoma
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Cellular Membrane Localization of Innate Immune Checkpoint Molecule CD47 Is Regulated by Radixin in Human Pancreatic

Takuro Kobori1, Yui Ito1, Yuka Sawada1

  • 1Laboratory of Clinical Pharmaceutics, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan.

Biomedicines
|May 16, 2023
PubMed

Insights

Radixin, a protein, helps CD47 (a "do not eat me" signal) stay on pancreatic cancer cells. Blocking this interaction may improve immunotherapy for pancreatic ductal adenocarcinoma (PDAC).

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • Immune checkpoint inhibitors show limited efficacy in pancreatic ductal adenocarcinoma (PDAC).
  • CD47 is overexpressed in PDAC, correlates with poor prognosis, and enables immune evasion by signaling macrophages.
  • Blocking CD47 is a potential immunotherapy strategy for PDAC.

Purpose of the Study:

  • To investigate the role of ezrin/radixin/moesin (ERM) proteins in the cell surface localization of CD47 in human PDAC cells.
  • To determine if ERM proteins contribute to CD47's presence on the plasma membrane.

Main Methods:

  • Immunofluorescence analysis to assess co-localization of CD47 and ERM proteins.
  • Gene silencing (siRNA) to evaluate the effect on CD47 expression.
  • Co-immunoprecipitation assay to confirm protein interactions.

Main Results:

  • CD47 and radixin showed significant co-localization at the plasma membrane of PDAC cells.
  • Radixin gene silencing, but not ezrin, reduced cell surface CD47 expression without affecting mRNA levels.
  • CD47 and radixin were found to interact physically.

Conclusions:

  • Radixin acts as a scaffold protein, regulating the cell surface localization of CD47 in PDAC cells.
  • This interaction is a potential therapeutic target for enhancing PDAC immunotherapy.
Keywords:
CD47cancer immunotherapyezrin/radixin/moesininnate immune checkpoint moleculepancreatic ductal adenocarcinoma

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