Expression of mutant p53 proteins implicates a lineage relationship between neural stem cells and malignant
Yuan Wang1, Jiong Yang, Huarui Zheng
1Department of Internal Medicine, Division of Molecular Medicine and Genetics, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
Abstract:
Recent studies have identified genes and core pathways that are altered in human glioblastoma. However, the mechanisms by which alterations of these glioblastoma genes singly and cooperatively transform brain cells remain poorly understood. Further, the cell of origin of glioblastoma is largely elusive. By targeting a p53 in-frame deletion mutation to the brain, we show that p53 deficiency provides no significant growth advantage to adult brain cells, but appears to induce pleiotropic accumulation of cooperative oncogenic alterations driving gliomagenesis. Our data show that accumulation of a detectable level of mutant p53 proteins occurs first in neural stem cells in the subventricular zone (SVZ) and that subsequent expansion of mutant p53-expressing Olig2(+) transit-amplifying progenitor-like cells in the SVZ-associated areas initiates glioma formation.
Insights
p53 deficiency alone doesn't drive brain cell growth but enables cooperative oncogenic alterations. Mutant p53 accumulation in neural stem cells initiates glioma formation in the subventricular zone.
Area of Science:
- Neuro-oncology
- Cancer genetics
- Glioblastoma research
Background:
- Glioblastoma involves altered genes and pathways, but transformation mechanisms and cell of origin are unclear.
- Understanding these mechanisms is crucial for developing effective glioblastoma treatments.
Purpose of the Study:
- To investigate the role of p53 mutations in glioblastoma initiation.
- To identify the cell of origin for glioblastoma development.
- To elucidate the cooperative mechanisms driving gliomagenesis.
Main Methods:
- Targeting an in-frame p53 deletion mutation to the brain in a model system.
- Analyzing p53 protein accumulation in neural stem cells and progenitor cells.
- Identifying specific cell populations involved in glioma formation.
Main Results:
- p53 deficiency alone did not significantly enhance adult brain cell growth.
- Mutant p53 accumulation was first detected in subventricular zone (SVZ) neural stem cells.
- Glioma formation was initiated by the expansion of mutant p53-expressing Olig2(+) progenitor-like cells in SVZ-associated areas.
Conclusions:
- p53 deficiency acts as a critical early event, facilitating the accumulation of cooperative oncogenic alterations.
- Neural stem cells in the SVZ are a likely cell of origin for glioblastoma.
- Olig2(+) progenitor-like cells play a key role in initiating glioma formation upon p53 mutation.
More Related Videos
08:57Identifying, Diagnosing, and Grading Malignant Peripheral Nerve Sheath Tumors in Genetically Engineered Mouse Models
Published on: May 17, 2024
09:37Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells
Published on: August 25, 2021
