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  • Title: NME2 associates with PTPσ to transduce signals from chondroitin sulfate proteoglycans.
    Author: Hamasaki H, Fujitani M, Yamashita T.
    Journal: Biochem Biophys Res Commun; 2016 Mar 18; 471(4):522-7. PubMed ID: 26896769.
    Abstract:
    Chondroitin sulfate proteoglycans (CSPGs) are a major component of glial scars, inhibiting axonal growth in the central nervous system. Protein tyrosine phosphatase, receptor type S (PTPσ) has been identified as a receptor for CSPGs, whereas its downstream signaling pathway remains to be fully understood. Here, we report that nucleoside diphosphate kinase 2 (NME2) interacts with PTPσ. We screened proteins associated with PTPσ by mass spectrometry, and obtained NME2. Immunoprecipitation analysis revealed that NME2 associated with the PTPσ intracellular domain in HEK-293T cells. NME2 was expressed in the cytoplasm and nucleus of cortical neurons, and knockdown of NME2 in the cortical neurons completely rescued neurite outgrowth inhibition induced by CSPGs. These results demonstrate that NME2 associates with PTPσ to elicit neurite outgrowth inhibition in response to CSPGs.
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