Biochem Biophys Res Commun. 2004 Sep 3;321(4):1045-9.

Neuroglycan C, a novel member of the neuregulin family.

Kinugasa Y, Ishiguro H, Tokita Y, Oohira A, Ohmoto H, Higashiyama S.

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Division of Biochemistry and Molecular Biology, Department of Cellular and Molecular Genetics, Ehime University School of Medicine, Shitukawa, Shigenobu-cho, Onsen-gun, Ehime 791-0295, Japan.

Abstract

Neuroglycan C (NGC) is a transmembrane chondroitin sulfate proteoglycan expressed predominantly in the brain that possesses an EGF-like extracellular domain. The goal of the present study was to determine whether NGC may activate ErbB tyrosine kinases. A recombinant human NGC extracellular domain induced tyrosine phosphorylation of ErbB2 and ErbB3 as well as cell growth of the human breast tumor cell lines, T47D and MDA-MB-453. In vitro pull-down assay revealed that NGC could directly bind to a recombinant ErbB3-immunoglobulin Fc fusion protein (ErbB3-Fc) but not to ErbB1-Fc, ErbB2-Fc or ErbB4-Fc. A newly established anti-ErbB3 neutralizing monoclonal antibody (#5C3) almost completely blocked NGC-induced ErbB activation in MDA-MB-453 cells. Taken together, these data indicate that NGC is an active growth factor and a direct ligand for ErbB3 and that NGC transactivates ErbB2. Thus, NGC should be classified as the sixth member (neuregulin-6) of the neuregulin family.

PMID:: 15358134; [PubMed - indexed for MEDLINE]

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Neuroglycan C, a novel member of the neuregulin family.
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Biochem Biophys Res Commun. 2004 Sep 3 ;321(4):1045-9.

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