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Updated: Jul 15, 2026
Transposon Mediated Integration of Plasmid DNA into the Subventricular Zone of Neonatal Mice to Generate Novel Models of Glioblastoma
Published on: February 22, 2015
Transgenic E2F1 expression in the mouse brain induces a human-like bimodal pattern of tumors
Melissa V Olson1, David G Johnson, Hong Jiang
1Department of Neuro-Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA.
Abstract:
The Rb/E2F pathway is deregulated in most human brain tumors, and the finding that loss of E2F1 reduced pituitary tumorigenesis in Rb(+/-) mice suggests that loss of pRb induces brain tumors by activating E2F1. We therefore investigated the role of E2F1 in the development and maintenance of brain cancer using a transgenic mouse model engineered to express E2F1 specifically within glial cells (GFAP-tgE2F1). GFAP-tgE2F1 mice developed a highly penetrant phenotype characterized by neurologic defects, and examination of the brains revealed the presence of brain tumors in 20% of these animals. Importantly, the distribution of tumors according to mouse age suggests the existence of a bimodal pattern of tumor development, forcing a comparison with the human disease. Mice, at an early age, with deregulated E2F1 show the formation of embryonal brain tumors such as medulloblastoma, choroid plexus carcinoma, and primary neuroectodermal tumor. Conversely, at an older age, mice escaping embryonal tumor formation present with malignant gliomas, which are typically identified in the human adult population. Thus, this study offers the first evidence for a global role of E2F1 in the formation and maintenance of multilineage brain tumors, irrefutably establishing E2F1 as an oncogene in the brain.
Insights
The study establishes E2F1 as a brain oncogene. Deregulated E2F1 drives both embryonal brain tumors and malignant gliomas in mice, mirroring human brain cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Neuroscience
Background:
- The Retinoblastoma (Rb)/E2F pathway is frequently deregulated in human brain tumors.
- Loss of pRb in mice leads to pituitary tumors, suggesting E2F1 activation contributes to brain tumor induction.
Purpose of the Study:
- To investigate the role of E2F1 in the development and maintenance of brain cancer.
- To establish E2F1 as an oncogene in the brain.
Main Methods:
- Utilized a transgenic mouse model (GFAP-tgE2F1) engineered to express E2F1 specifically in glial cells.
- Observed tumor development and characterized tumor types based on mouse age.
Main Results:
- GFAP-tgE2F1 mice exhibited neurological defects and developed brain tumors in 20% of cases.
- A bimodal tumor development pattern was observed: embryonal tumors (medulloblastoma, choroid plexus carcinoma, PNET) in young mice, and malignant gliomas in older mice.
- Demonstrated a global role for E2F1 in multilineage brain tumor formation.
Conclusions:
- E2F1 is irrefutably established as an oncogene in the brain.
- The findings provide evidence for E2F1's role in both embryonal and adult-type brain cancers, offering insights into human brain tumor pathogenesis.
