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Updated: Aug 9, 2026
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Generation of Human CD40-activated B cells
Published on: October 17, 2009
Expression of functional CD40 on human osteosarcoma and Ewing's sarcoma cells
P L Lollini1, L Landuzzi, F Frabetti
1Institute for Cancer Research, University of Bologna, Italy. pierluigi@lollini.dsnet.it
Summary
CD40 (tumor necrosis factor receptor family) is expressed in osteosarcoma and Ewing's sarcoma, but not rhabdomyosarcoma. Its activation impacts tumor cell survival and malignancy, suggesting therapeutic potential.
Area of Science:
- Oncology
- Immunology
- Molecular Biology
Background:
- CD40, a TNF receptor family member, is expressed on various tumors but its role in sarcomas is largely unknown.
- Understanding CD40 expression in sarcoma is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate CD40 expression in human osteosarcoma, Ewing's sarcoma, and rhabdomyosarcoma cell lines and tissues.
- To analyze the functional consequences of CD40 engagement in CD40-expressing sarcoma cells.
Main Methods:
- Flow cytometry was used to assess CD40 expression on sarcoma cell lines and primary tissues.
- Recombinant soluble CD40 ligand was used to stimulate CD40-expressing cells.
- Apoptosis levels and matrix metalloproteinase 9 (MMP-9) gene transcription and secretion were measured.
Main Results:
- CD40 was detected in one-third of osteosarcomas and most Ewing's sarcomas, but not in rhabdomyosarcomas.
- Immunostaining confirmed CD40 expression in some primary high-grade osteosarcomas.
- CD40 ligand treatment increased apoptosis and MMP-9 secretion in osteosarcoma and Ewing's sarcoma cells.
Conclusions:
- CD40 is a functional receptor in human osteosarcoma and Ewing's sarcoma.
- CD40 engagement can have dual effects on tumor cell survival and malignancy.
- Targeting CD40 may offer a novel therapeutic strategy for specific sarcoma subtypes.
