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Human corneal keratan sulfates

G H Tai1, I A Nieduszynski, N J Fullwood

  • 1Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, United Kingdom.

The Journal of Biological Chemistry
|November 14, 1997
PubMed
Summary
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Human corneal keratan sulfates show distinct capping structures, primarily Neu5Acα(2-6), differing from bovine keratan sulfate. Human samples also exhibit higher fucosylation, suggesting potential age or species-related variations in corneal proteoglycans.

Area of Science:

  • Biochemistry
  • Ophthalmology
  • Glycobiology

Background:

  • Keratan sulfate (KS) is a major glycosaminoglycan in the cornea.
  • Proteoglycans containing keratan sulfate are crucial for corneal structure and hydration.
  • Understanding variations in corneal KS structure is important for ophthalmology and glycobiology.

Purpose of the Study:

  • To characterize the oligosaccharide structures of human corneal keratan sulfate proteoglycans.
  • To compare the capping structures and repeat regions of human corneal KS with those of bovine corneal KS.
  • To investigate potential age- or species-dependent differences in corneal KS composition.

Main Methods:

  • Isolation of keratan sulfate-containing proteoglycans from pooled human corneas.
  • Enzymatic digestion with keratanase II to release oligosaccharides.

Related Experiment Videos

  • Analysis of released oligosaccharides using ion-exchange chromatography and NMR spectroscopy.

    • Main Results:

    • Human corneal KS predominantly features Neu5Acα(2-6) as the major capping structure, followed by Neu5Acα(2-3) and GalNAc(S)β(1-3).
    • Specific capping structures found in bovine KS, such as NeuGc and GlcNAc(S), were absent in the human samples.
    • Human corneal KS exhibited significantly higher levels of α(1-3)-fucosylated repeat region structures compared to bovine KS.

    Conclusions:

    • Human corneal keratan sulfate proteoglycans possess distinct capping structures compared to bovine.
    • The observed differences in fucosylation may indicate species- or age-related variations in corneal KS.
    • Further research is needed to elucidate the functional implications of these structural differences.