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IIp45, an insulin-like growth factor binding protein 2 (IGFBP-2) binding protein, antagonizes IGFBP-2 stimulation of glioma cell invasion

By Sonya W. Song, Gregory N. Fuller, Asadullah Khan, Shouming Kong, Weiping Shen, Ellen Taylor, Latha Ramdas, Frederick F. Lang and Wei Zhang

Abstract

Our previous studies have shown that insulin-like growth factor binding protein 2 (IGFBP-2) is frequently overexpressed in the highly invasive glioblastoma multiforme (GBM). By using a yeast two-hybrid system, we identified a gene, invasion inhibitory protein 45 (IIp45), whose protein product bound to IGFBP-2 through the thyroglobulin-RGD region of the C terminus of IGFBP-2. The IIp45 gene is located on chromosome 1p36 and has nine exons. The IIp45 protein has three SEG (segment of low compositional complexity) domains and an integrin-binding RGD motif. The IIp45 protein was not expressed in some GBMs. Functional studies showed that IIp45 inhibited GBM cell invasion both in vitro and in xenograft model. Gene expression profiling studies showed that IIp45 consistently inhibited the expression of cell invasion-associated genes, such as the transcriptional NFκB, and its downstream target gene, intercellular adhesion molecule 1. Thus, we report here the isolation and characterization of a gene, IIp45, whose protein product binds to IGFBP-2 and inhibits glioma cell invasion

Topics: Biological Sciences
Publisher: National Academy of Sciences
Year: 2003
DOI identifier: 10.1073/pnas.2332186100
OAI identifier: oai:pubmedcentral.nih.gov:283530
Provided by: PubMed Central
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