Related Experiment Videos
Immune system evasion by peripheral nerve sheath tumor
Philip R Lee1, Jonathan E Cohen, R Douglas Fields
1Nervous System Development and Plasticity Section, National Institutes of Health, NICHD, Bldg. 35, Room 2A211, MSC 3713, 35 Lincoln Drive, Bethesda, MD 20892, USA.
Neuroscience Letters
|January 13, 2006
Summary
Tumor cells in neurofibromatosis type 1 (NF1) may evade immune detection by down-regulating antigen processing and presentation. This immune "silencing" could be crucial for malignant peripheral nerve sheath tumor (MPNST) development.
Area of Science:
- Immunology
- Oncology
- Genetics
Background:
- Neurofibromatosis type 1 (NF1) is a genetic disorder associated with a 5-10% risk of developing malignant peripheral nerve sheath tumors (MPNSTs).
- Tumor cells' ability to evade host immune detection is implicated in cancer progression, but this mechanism remains unexplored in NF1-associated MPNSTs.
Purpose of the Study:
- To investigate the molecular mechanisms of immune evasion in NF1-related MPNSTs.
- To identify specific immune function genes and pathways affected in MPNST cells compared to normal cells.
Main Methods:
- Large-scale gene expression profiling was performed on an MPNST-derived cell line (T265) and normal human Schwann cells (hSCs).
- Analysis focused on immune function genes, including those involved in antigen processing and presentation.
Main Results:
- MPNST cells exhibited down-regulation of numerous immune function genes compared to hSCs.
- Aberrant expression included MHC class I and II related genes, the transcription factor MHC2TA, TAP1 (transporter-activator protein), and CD74 (chaperone protein).
- CD74 showed alternative splicing in MPNST cells, producing a transcript absent in normal cells.
Conclusions:
- MPNST cells utilize multiple molecular pathways and cellular mechanisms to reduce immune system molecules involved in antigen processing and presentation.
- Acquiring a "silent" immune signature appears to be a critical step in the malignant progression of MPNSTs.