PMID: 9525812Apr 3, 1998Paper

The role of transforming growth factor beta in glioma progression

Journal of Neuro-oncology
M T Jennings, J A Pietenpol

Abstract

This review examines the apparently paradoxical conversion of transforming growth factor beta's (TGFbeta) regulatory role as a growth inhibitor among normal glial cells to that of a progression factor among glioblastomas (GM). In vitro, TGFbeta functions as an autocrine growth inhibitor of near-diploid gliomas of any grade. In contrast, hyperdiploid glioblastoma multiforme (HD-GM) cultures proliferate in response to TGFbeta, which is mediated by induction of platelet-derived growth factor B chain (PDGF-BB). The dominant hypothesis of TGFbeta's pathogenetic association with malignant transformation has been predicated upon acquisition of resistance to its growth inhibitory effects. However, the lack of obvious correlation with TGFbeta receptor (TbetaR) expression (or loss) between the HD-GM and the TGFbeta-inhibited GM cultures suggests the existence of intrinsically opposed regulatory mechanisms influenced by TGFbeta. The mechanism of conversion might be explained either by the loss of a putative tumor suppressor gene (TSG) which mediates TGFbeta's inhibition of growth or by enhancement of an active oncogenic pathway among the HD-GM. The frequency of mutations within glioma-associated TSG, such as TP53 and RB, suggests that def...Continue Reading

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