Section 13
Chapter 12,276

Loss of core fucosylation of low-density lipoprotein receptor-related protein-1 impairs its function, leading to the upregulation of serum levels of insulin-like growth factor-binding protein 3 in Fut8-/- mice

Lee, S.Ho.; Takahashi, M.; Honke, K.; Miyoshi, E.; Osumi, D.; Sakiyama, H.; Ekuni, A.; Wang, X.; Inoue, S.; Gu, J.; Kadomatsu, K.; Taniguchi, N.

Journal of Biochemistry 139(3): 391-398


ISSN/ISBN: 0021-924X
PMID: 16567404
DOI: 10.1093/jb/mvj039
Accession: 012275034

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[alpha]1,6-Fucosyltransferase (Fut8) catalyzes the transfer of a fucose residue from GDP-fucose to the innermost N-acetylglucosamine residue of N-glycans. Here we report that the loss of core fucosylation impairs the function of low-density lipoprotein (LDL) receptor-related protein-1 (LRP-1), a multifunctional scavenger and signaling receptor, resulting in a reduction in the endocytosis of insulin like growth factor (IGF)-binding protein-3 (IGFBP-3) in the cells derived from Fut8-null (Fut8[superscript -/-]) mice. The reduced endocytosis was restored by the re-introduction of Fut8. Serum levels of IGFBP-3 were markedly upregulated in Fut8[superscript -/-] mice. These data clearly indicate that core fucosylation is crucial for the scavenging activity of LRP-1 in vivo.

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