2. Academic Validation
  3. UDP-sugar substrates of HAS3 regulate its O-GlcNAcylation, intracellular traffic, extracellular shedding and correlate with melanoma progression

UDP-sugar substrates of HAS3 regulate its O-GlcNAcylation, intracellular traffic, extracellular shedding and correlate with melanoma progression

  • Cell Mol Life Sci. 2016 Aug;73(16):3183-204. doi: 10.1007/s00018-016-2158-5.
Ashik Jawahar Deen 1,  Uma Thanigai Arasu 2,  Sanna Pasonen-Seppänen 2,  Antti Hassinen 3,  Piia Takabe 2,  Sara Wojciechowski 4,  Riikka Kärnä 2,  Kirsi Rilla 2,  Sakari Kellokumpu 3,  Raija Tammi 2,  Markku Tammi 2,  Sanna Oikari 5 6
Affiliations

Affiliations

  • 1 Institute of Biomedicine, School of Medicine, University of Eastern Finland, 70210, Kuopio, Finland. [email protected].
  • 2 Institute of Biomedicine, School of Medicine, University of Eastern Finland, 70210, Kuopio, Finland.
  • 3 Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90014, Oulu, Finland.
  • 4 A. I. Virtanen Institute for Molecular Sciences, School of Medicine, University of Eastern Finland, 70210, Kuopio, Finland.
  • 5 Institute of Biomedicine, School of Medicine, University of Eastern Finland, 70210, Kuopio, Finland. [email protected].
  • 6 Institute of Dentistry, School of Medicine, University of Eastern Finland, 70210, Kuopio, Finland. [email protected].
PMID: 26883802 DOI: 10.1007/s00018-016-2158-5
Abstract

Hyaluronan content is a powerful prognostic factor in many Cancer types, but the molecular basis of its synthesis in Cancer still remains unclear. Hyaluronan synthesis requires the transport of hyaluronan synthases (HAS1-3) from Golgi to plasma membrane (PM), where the enzymes are activated. For the very first time, the present study demonstrated a rapid recycling of HAS3 between PM and endosomes, controlled by the cytosolic levels of the HAS substrates UDP-GlcUA and UDP-GlcNAc. Depletion of UDP-GlcNAc or UDP-GlcUA shifted the balance towards HAS3 endocytosis, and inhibition of hyaluronan synthesis. In contrast, UDP-GlcNAc surplus suppressed endocytosis and lysosomal decay of HAS3, favoring its retention in PM, stimulating hyaluronan synthesis, and HAS3 shedding in extracellular vesicles. The concentration of UDP-GlcNAc also controlled the level of O-GlcNAc modification of HAS3. Increasing O-GlcNAcylation reproduced the effects of UDP-GlcNAc surplus on HAS3 trafficking, while its suppression showed the opposite effects, indicating that O-GlcNAc signaling is associated to UDP-GlcNAc supply. Importantly, a similar correlation existed between the expression of GFAT1 (the rate limiting Enzyme in UDP-GlcNAc synthesis) and hyaluronan content in early and deep human melanomas, suggesting the association of UDP-sugar metabolism in initiation of melanomagenesis. In general, changes in glucose metabolism, realized through UDP-sugar contents and O-GlcNAc signaling, are important in HAS3 trafficking, hyaluronan synthesis, and correlates with melanoma progression.

Keywords

4MU; GNPDA; Glucosamine; Mannose; OGT; UGDH.

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