Ras-GTP levels are elevated in human NF1 peripheral nerve tumors.

Abstract

Neurofibromin, the gene product of NF1, is a Ras GTPase Activating Protein. The absence of neurofibromin leads to increased levels of Ras-GTP, which contributes to the proliferation of NF1 neurogenic sarcoma cell lines. Whether this pathogenic mechanism is applicable to benign and malignant peripheral nerve tumours from NF1 and non NF1 patients is not known, due to lack of a tissue based assay. We have adapted a colorimetric enzymatic assay for determining levels of Ras bound guanine nucleotides in tissues. Ras-GTP levels were increased in NF1 neurogenic sarcomas (15 times) and benign NF1 neurofibromas (four times), compared to non NF1 schwannomas. Neurofibromin was not expressed in NF1 sarcomas, in support of its important negative Ras regulatory role in the pathogenesis of NF1 peripheral nerve tumors.

• Authors: A Guha, N Lau, I Huvar, D Gutmann, J Provias, T Pawson, G Boss
• Journal: Oncogene (Oncogene) Vol. 12 Issue 3 Pg. 507-13 (Feb 01 1996) ISSN: 0950-9232 [Print] England
• PMID: 8637706 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• DNA Primers
• GTPase-Activating Proteins
• Neurofibromin 1
• Proteins
• ras GTPase-Activating Proteins
• Guanosine Diphosphate
• Guanosine Triphosphate

Topics

• Base Sequence
• Cell Line, Transformed
• DNA Primers
• GTPase-Activating Proteins
• Genes, Neurofibromatosis 1
• Genes, ras
• Guanosine Diphosphate (metabolism)
• Guanosine Triphosphate (metabolism)
• Humans
• Immunohistochemistry
• Molecular Sequence Data
• Neurilemmoma (metabolism, pathology)
• Neurofibroma (metabolism, pathology)
• Neurofibromin 1
• Peripheral Nervous System Neoplasms (metabolism, pathology)
• Polymerase Chain Reaction
• Protein Biosynthesis
• Proteins (genetics, metabolism)
• Sarcoma (metabolism, pathology)
• ras GTPase-Activating Proteins