Neurofibromas in NF1: Schwann Cell Origin and Role of Tumor Environment
Yuan Zhu,1
Pritam Ghosh,1
Patrick Charnay,3
Dennis K. Burns,2
Luis F. Parada1*
Neurofibromatosis type 1 (NF1) is one of the most prevalent
dominantly inherited genetic diseases of the nervous system. NF1 encodes a tumor suppressor whose functional loss results in the development of benign neurofibromas that can progress to malignancy. Neurofibromas are complex tumors composed of axonal processes, Schwann
cells, fibroblasts, perineurial cells, and mast cells. Through use of a
conditional (cre/lox) allele, we show that loss of NF1 in the Schwann cell lineage is sufficient to generate tumors. In
addition, complete NF1-mediated tumorigenicity requires both a loss of
NF1 in cells destined to become neoplastic as well as heterozygosity in
non-neoplastic cells. The requirement for a permissive
haploinsufficient environment to allow tumorigenesis may have
therapeutic implications for NF1 and other familial cancers.
1 Center for Developmental Biology,
2 Department of Pathology, University of Texas
Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, TX
75390-9133, USA.
3 Ecole Normale Superieure, 46 rue
d'Ulm 75230, Paris, Cedex 05, France.
*
To whom correspondence should be addressed. E-mail:
luis.parada{at}utsouthwestern.edu
