Reduced mannose incorporation into GDP-mannose and dolichol-linked intermediates of N-glycosylation in hamster liver during vitamin A deficiency

Donata Rimoldi, Kim E. Creek, Luigi M. De Luca

Research output: Contribution to journalArticlepeer-review

Abstract

The molecular mechanism of reduced incorporation of radioactively labeled mannose into hamster liver glycoconjugates during the progression of vitamin A deficiency was investigated. In particular the in vivo incorporation of [2-3H]mannose into GDP-mannose, dolichyl phosphate mannose (Dol-P-Man), lipid-linked oligosaccharides, and glycopeptides of hamster liver was examined. Hamsters maintained on a vitamin A-free diet showed a reduction in the incorporation of mannose into GDP-mannose about 10 days before clinical signs of vitamin A deficiency could be observed. The decrease in [2-3H]mannose incorporated into GDP-mannose was accompanied by a reduction in label incorporated into Dol-P-Man, lipid linked oligosaccharides and glycopeptides, which became more severe with the progression of vitamin A deficiency. By the time they reached a plateau stage of growth, hamsters fed the vitamin A-free diet showed a 50% reduction in the amount of [2-3H]mannose converted to GDP-mannose, and the radioactivity associated with Dol-P-Man and glycopeptides was reduced by approximately 60% as compared to retinoic acid-supplemented controls. These results strongly indicate that the reduced incorporation of mannose into lipidic intermediates and glycoproteins observed during vitamin A deficiency is due to impaired GDP-mannose synthesis.

Original languageEnglish (US)
Pages (from-to)129-140
Number of pages12
JournalMolecular and Cellular Biochemistry
Volume93
Issue number2
DOIs
StatePublished - Mar 1 1990
Externally publishedYes

Keywords

  • GDP-mannose
  • glycosylation
  • lipid intermediates
  • liver
  • vitamin A

ASJC Scopus subject areas

  • Molecular Biology
  • Clinical Biochemistry
  • Cell Biology

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