Lookup NU author(s): Dr Richard Gilbertson,
Professor Steven Clifford,
Dr Christopher Wright,
Emeritus Professor Robert Perry,
Professor Andrew Pearson,
Professor John Lunec
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
The four receptor tyrosine kinase I receptors, ErbB-1, ErbB-2, ErbB-3, and ErbB-4, which have been implicated in the development of a variety of normal and malignant tissues, are activated through ligand mediated homo- and heterodimerization. We have previously reported the frequent coexpression, heterodimerzation, and prognostic significance of ErbB-2 and ErbB-4 in childhood medulloblastoma, an embryonal tumor of the cerebellar external granule cell layer (EGL). In the present study, we have used immunohistochemistry and Western blotting analysis to analyze the expression of the ErbB receptors and neuregulin (NRG) 1-α and NRG1-β ligands during normal human cerebellar development. We demonstrate that ErbB-1, ErbB-3, ErbB-4, and NRG1-β display specific temporal and topographical distribution in the cerebellum during intrauterine and postnatal life, and that normal ErbB-NRG signaling in the EGL multiplying zone is likely to be mediated by ErbB-4 and NRG1-β. In contrast, ErbB-2, which is expressed in 86% of medulloblastomas, could not be detected at any stage of cerebellar development. Therefore, we propose that positive deregulation of ErbB-2 expression in the cerebellar EGL, leading to the formation of a NRG1-β- driven ErbB-2/ErbB-4 autocrine loop, is an important factor in medulloblastoma tumorigenesis. In further support of this hypothesis, we provide evidence using reverse transcription-PCR analysis that expression of the ErbB-2 and ErbB-4 receptors, but not ErbB-1 or ErbB-3, is deregulated in medulloblastoma compared with normal developing cerebellum. We also demonstrate NRG1-β expression in 87% (n = 46 of 48) of medulloblastoma primary tumors, with the greatest expression levels occurring in tumors with high ErbB-2 and ErbB-4 receptor coexpression. Furthermore, the expression of all three components of the proposed autocrine loop (i.e., ErbB-2, ErbB-4, and NRG1-β) was significantly related to the presence of metastases at diagnosis (P < 0.05).
Author(s): Gilbertson RJ, Clifford SC, MacMeekin W, Wright C, Perry RH, Kelly P, Pearson ADJ, Lunec J
Publication type: Article
Publication status: Published
Journal: Cancer Research
Print publication date: 01/09/1998
ISSN (print): 0008-5472
ISSN (electronic): 1538-7445
PubMed id: 9731505