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Updated: Jul 20, 2026

Isolation and Flow Cytometric Analysis of Glioma-infiltrating Peripheral Blood Mononuclear Cells
Published on: November 28, 2015
The Ras suppressor RSU-1 localizes to 10p13 and its expression in the U251 glioblastoma cell line correlates with a
T Tsuda1, M R Marinetti, L Masuelli
1Laboratory of Tumor Immunology and Biology, National Cancer Institute, Bethesda, Maryland 20892-1750, USA.
The RSU-1 gene, a Ras-interacting protein, was found to suppress tumor growth. Its loss of function may contribute to glioblastoma progression, as restoring RSU-1 in cancer cells reduced their tumorigenicity.
Area of Science:
- Molecular Biology
- Cancer Genetics
Background:
- RSU-1 is a conserved gene homologous to yeast adenylyl cyclase, identified by its ability to suppress v-Ras transformation.
- RSU-1 maps to chromosome 10p13, a region frequently deleted in glioblastomas.
Purpose of the Study:
- To investigate the role of RSU-1 in glioblastoma.
- To determine if RSU-1 loss of function contributes to glioblastoma development.
Main Methods:
- Fluorescence in situ hybridization (FISH) for gene mapping.
- RNA and protein expression analysis in human tumor cell lines.
- Gene transfection and functional assays in U251 glioblastoma cells.
- Tumorigenicity assays in athymic nude mice.
Main Results:
- RSU-1 protein was undetectable in U251 glioblastoma cells.
- Reintroduction of RSU-1 into U251 cells reduced growth rate, anchorage-independent growth, and colony formation.
- RSU-1 expressing U251 transfectants were non-tumorigenic in vivo.
Conclusions:
- Loss of RSU-1 function may be a critical event in glioblastoma progression.
- RSU-1 acts as a tumor suppressor, and its restoration can reverse malignant phenotypes.
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