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    Glycoconj J. 2002 May-Jun;19(4-5):315-8.

    Syndecan-4 as a molecule involved in defense mechanisms.

    Ishiguro K, Kojima T, Muramatsu T.

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    Department of Biochemistry and Department of Internal Medicine, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan.

    Abstract

    Syndecan-4 is a transmembrane heparan sulfate proteoglycan belonging to the syndecan family. Syndecan-4-deficient [(Synd4(-/-)] mice were produced to clarify the in vivo role of syndecan-4. Synd4(-/-) mice were more susceptible to kappa-carrageenan-induced nephropathy, and the placental labyrinth from the deficient embryos exhibited more thrombi than wild-type ones. Importantly, Synd4(-/-) mice were more susceptible to endotoxin shock. Further analysis revealed that the mechanism to suppress excessive production of interleukin-1beta (1L-1beta) by transforming growth factor-beta (TGF-beta) was impaired in the deficient mice. TGF-beta, one of the cytokines involved in the suppression mechanism, bound to heparan sulfate chain of syndecan-4, which was induced in macrophages and the microvasculature after administration of lipopolysaccharide. Therefore, augmentation of TGF-beta function by induced syndecan-4 was suggested as a mechanism of the suppressive action of syndecan-4 against endotoxin shock.

    PMID:
    12975610
    [PubMed - indexed for MEDLINE]

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