Early Inactivation of P53 Tumor Suppressor Gene Cooperating with NF1 Loss Induces Malignant Astrocytoma

Overview

Journal Cancer Cell

Publisher Cell Press

Specialty Oncology

Date 2005 Aug 16

PMID 16098465

Citations 264

Authors

Yuan Zhu

Frantz Guignard

Dawen Zhao

Li Liu

Dennis K Burns

Ralph P Mason

Albee Messing

Luis F Parada

Affiliations

Soon will be listed here.

Abstract

Malignant astrocytoma, the most prevalent primary brain tumor, is resistant to all known therapies and frequently harbors mutations that inactivate p53 and activate Ras signaling. We have generated mouse strains that lack p53 and harbor a conditional allele of the NF1 tumor suppressor that negatively regulates Ras signaling. The mice develop malignant astrocytomas with complete penetrance. The majority of tumors display characteristics of glioblastoma multiforme with concomitant alteration of signaling pathways previously described in the human counterparts of this neoplasm. We find that the sequence of tumor suppressor inactivation influences tumorigenicity and that earliest evidence of tumor formation localizes to regions of the brain that contain a multipotent stem cell population capable of in vivo differentiation into neurons and glia.

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