Nf1+/- mast cells induce neurofibroma like phenotypes through secreted TGF-beta signaling.

Abstract:

:Neurofibromas are common tumors found in neurofibromatosis type 1 (NF1) patients. These complex tumors are composed of Schwann cells, mast cells, fibroblasts and perineurial cells embedded in collagen that provide a lattice for tumor invasion. Genetic studies demonstrate that in neurofibromas, nullizygous loss of Nf1 in Schwann cells and haploinsufficiency of Nf1 in non-neuronal cells are required for tumorigenesis. Fibroblasts are a major cellular constituent in neurofibromas and are a source of collagen that constitutes approximately 50% of the dry weight of the tumor. Here, we show that two of the prevalent heterozygous cells found in neurofibromas, mast cells and fibroblasts interact directly to contribute to tumor phenotype. Nf1+/- mast cells secrete elevated concentrations of the profibrotic transforming growth factor-beta (TGF-beta). In response to TGF-beta, both murine Nf1+/- fibroblasts and fibroblasts from human neurofibromas proliferate and synthesize excessive collagen, a hallmark of neurofibromas. We also establish that the TGF-beta response occurs via hyperactivation of a novel Ras-c-abl signaling pathway. Genetic or pharmacological inhibition of c-abl reverses fibroblast proliferation and collagen synthesis to wild-type levels. These studies identify a novel molecular target to inhibit neurofibroma formation.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Yang FC,Chen S,Clegg T,Li X,Morgan T,Estwick SA,Yuan J,Khalaf W,Burgin S,Travers J,Parada LF,Ingram DA,Clapp DW

doi

10.1093/hmg/ddl165

subject

Has Abstract

pub_date

2006-08-15 00:00:00

pages

2421-37

issue

16

eissn

0964-6906

issn

1460-2083

pii

ddl165

journal_volume

15

pub_type

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