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Updated: Feb 16, 2026
07:17
An Orthotopic Resectional Mouse Model of Pancreatic Cancer
Published on: September 24, 2020
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CD47 Blockade as an Adjuvant Immunotherapy for Resectable Pancreatic Cancer
Alex D Michaels1, Timothy E Newhook1, Sara J Adair1
1Department of Surgery, University of Virginia Health System, Charlottesville, Virginia.
Summary
Liver macrophages suppress pancreatic cancer liver metastasis. Blocking the CD47 "don't eat me" signal enhances macrophage clearance of pancreatic ductal adenocarcinoma cells, prolonging survival in mice.
Area of Science:
- Immunology
- Oncology
- Cancer Metastasis
Background:
- Pancreatic ductal adenocarcinoma (PDAC) patients face poor survival due to frequent liver recurrence after surgery and chemotherapy.
- Liver macrophages play a critical role in the progression of PDAC micrometastases.
- Identifying effective adjuvant therapies is crucial to improve patient outcomes.
Purpose of the Study:
- To investigate the role of liver macrophages in PDAC liver micrometastasis progression.
- To identify potential adjuvant treatment strategies targeting liver macrophages to prolong survival.
Main Methods:
- Utilized a murine splenic injection model of hepatic micrometastatic PDAC with patient-derived tumors.
- Assessed liver macrophage impact by depletion (liposomal clodronate) and using different mouse strains (nude vs. NOD-scid-gamma).
- Measured CD47 expression and performed in vitro/in vivo engulfment assays with CD47-blocking antibodies.
Main Results:
- Liver macrophages were found to suppress PDAC micrometastasis progression.
- CD47 expression varied among PDAC cell lines; blocking CD47 enhanced macrophage-mediated tumor cell clearance.
- Treatment with CD47-blocking antibodies increased time-to-progression and prolonged survival in mice.
Conclusions:
- Liver macrophages act as a barrier to PDAC liver metastasis.
- Targeting CD47 with blocking antibodies represents a promising adjuvant immunotherapy strategy.
- Anti-CD47 antibody therapy could significantly improve outcomes for patients with resected PDAC.
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