Abstract

Deficiency of the heparan sulfate biosynthesis enzyme N-deacetylase/N-sulfotransferase 1 (NDST1) in mice causes severely disturbed heparan sulfate biosynthesis in all organs, whereas lack of NDST2 only affects heparin biosynthesis in mast cells (MCs). To investigate the individual and combined roles of NDST1 and NDST2 during MC development, in vitro differentiated MCs derived from mouse embryos and embryonic stem cells, respectively, have been studied. Whereas MC development will not occur in the absence of both NDST1 and NDST2, lack of NDST2 alone results in the generation of defective MCs. Surprisingly, the relative amount of heparin produced in NDST1(+/-) and NDST1(-/-) MCs is higher (approximate to 30%) than in control MCs where approximate to 95% of the (35)S-labeled glycosaminoglycans produced is chondroitin sulfate. Lowered expression of NDST1 also results in a higher sulfate content of the heparin synthesized and is accompanied by increased levels of stored MC proteases. A model of the GAGosome, a hypothetical Golgi enzyme complex, is used to explain the results.

Published in

Journal of Biological Chemistry
2011, Volume: 286, number: 52, pages: 44433-44440
Publisher: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC

SLU Authors

• Åbrink, Magnus

  • Department of Animal Biosciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Organic Chemistry


Publication identifier

DOI: https://doi.org/10.1074/jbc.M111.303891

Permanent link to this page (URI)

https://res.slu.se/id/publ/58821