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Updated: Aug 7, 2025
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Isolation and Flow Cytometric Analysis of Glioma-infiltrating Peripheral Blood Mononuclear Cells
Published on: November 28, 2015
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Soluble Guanylate Cyclase β1 Subunit Represses Human Glioblastoma Growth
Haijie Xiao1, Haifeng Zhu2,3, Oliver Bögler4,5
1Department of Biochemistry and Molecular Medicine, The George Washington University, 2300 I Street NW, Washington, DC 20037, USA.
Cancers
|March 11, 2023
Summary
Restoring soluble guanylyl cyclase beta 1 (sGCβ1) expression inhibits aggressive glioma growth by targeting the TP53 gene promoter. This novel mechanism leads to cell cycle arrest and reduced tumor aggressiveness in glioblastoma.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Malignant glioma is a deadly brain tumor with reduced soluble guanylyl cyclase (sGC) transcript levels observed previously.
- The specific role of sGC subunits in glioma progression remains largely undefined.
Purpose of the Study:
- To investigate the direct role of sGCβ1 in repressing glioma aggressiveness.
- To elucidate the molecular mechanisms underlying the anti-glioma effects of sGCβ1.
Main Methods:
- Overexpression of sGCβ1 in human glioma cells.
- Assessment of cyclic GMP levels and response to sGC modulators.
- Nuclear translocation and chromatin immunoprecipitation assays to identify gene targets.
- Analysis of cell cycle progression, p53 accumulation, CDK6, and integrin α6 expression.
Main Results:
- sGCβ1 overexpression alone repressed glioma aggressiveness without affecting cyclic GMP levels or sGC activity.
- sGCβ1 was found to translocate into the nucleus and interact with the TP53 gene promoter.
- sGCβ1 induced G0 cell cycle arrest in glioblastoma cells, reduced CDK6, and decreased integrin α6 expression, promoting p53 nuclear accumulation.
Conclusions:
- sGCβ1 exhibits potent antitumor activity in glioma independent of its enzymatic function.
- Nuclear sGCβ1 acts as a transcriptional regulator, targeting TP53 to inhibit glioblastoma growth and aggressiveness.
- sGCβ1 and its downstream targets represent potential therapeutic strategies for malignant glioma.
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