SRPX2 Is a Novel Chondroitin Sulfate Proteoglycan That Is Overexpressed in Gastrointestinal Cancer

Department of Genome Biology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan.
PLoS ONE (Impact Factor: 3.23). 01/2012; 7(1):e27922. DOI: 10.1371/journal.pone.0027922
Source: PubMed


SRPX2 (Sushi repeat-containing protein, X-linked 2) has recently emerged as a multifunctional protein that is involved in seizure disorders, angiogenesis and cellular adhesion. Here, we analyzed this protein biochemically. SRPX2 protein was secreted with a highly posttranslational modification. Chondroitinase ABC treatment completely decreased the molecular mass of purified SRPX2 protein to its predicted size, whereas heparitinase, keratanase and hyaluroinidase did not. Secreted SRPX2 protein was also detected using an anti-chondroitin sulfate antibody. These results indicate that SRPX2 is a novel chondroitin sulfate proteoglycan (CSPG). Furthermore, a binding assay revealed that hepatocyte growth factor dose-dependently binds to SRPX2 protein, and a ligand-glycosaminoglycans interaction was speculated to be likely in proteoglycans. Regarding its molecular architecture, SRPX2 has sushi repeat modules similar to four other CSPGs/lecticans; however, the molecular architecture of SRPX2 seems to be quite different from that of the lecticans. Taken together, we found that SRPX2 is a novel CSPG that is overexpressed in gastrointestinal cancer cells. Our findings provide key glycobiological insight into SRPX2 in cancer cells and demonstrate that SRPX2 is a new member of the cancer-related proteoglycan family.

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Available from: Yasuhide Yamada, Sep 25, 2014
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    • "Also, whether the effects of SRPX2 on tubulin acetylation could be influenced by uPAR, depended on the cell line that was analysed here. Not exclusively, it was also recently proposed that SRPX2 is a chondroitin sulphate proteoglycan (CSPG) (Tanaka et al., 2012); CSPGs are prominent Figure 5 Continued (vehicle) had no effect (n = 12). Tubacin was injected intraperitoneally to the mother 24 and 48 h after in utero electroporations of the embryonic cerebral cortices. "
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