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Notch and Schwann cell transformation.
Yiwen Li1, Prakash K Rao, Rong Wen
1Department of Neurology and Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
Oncogene
|February 6, 2004
Summary
Malignant peripheral nerve sheath tumors (MPNSTs) in neurofibromatosis type 1 (NF1) may arise from aberrant Notch signaling. This pathway, not p53 mutations, appears crucial for the malignant transformation of benign neurofibromas.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Neurofibromatosis type 1 (NF1) patients are susceptible to malignant peripheral nerve sheath tumors (MPNSTs) arising from benign plexiform neurofibromas.
- While p53 gene mutations are implicated in MPNST development, their role is not fully understood.
Purpose of the Study:
- To investigate the role of Notch signaling in the malignant transformation of neurofibromas to MPNSTs.
- To determine if Notch signaling, independent of p53 mutations, contributes to MPNST pathogenesis.
Main Methods:
- Analysis of p53 activity and Notch signaling in human MPNST-derived Schwann cell lines.
- Expression of Notch intracellular domain (NICD) in primary rat Schwann cells.
- In vivo tumor formation assays in nude rats.
Main Results:
- Human MPNST Schwann cell lines exhibited active p53, but one line showed significant Notch signaling (NICD expression).
- NICD expression induced robust transformation of primary rat Schwann cells.
- NICD-transduced cells formed tumors in vivo and lost Schwann cell differentiation markers.
Conclusions:
- Aberrant Notch signaling, indicated by NICD, may drive the malignant conversion of benign neurofibromas to MPNSTs in NF1.
- Notch signaling represents a potential therapeutic target for preventing or treating MPNSTs.