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Related Experiment Videos

Altered keratan sulfate epitopes in keratoconus.

J L Funderburgh1, N Panjwani, G W Conrad

  • 1Division of Biology, Kansas State University, Manhattan.

Investigative Ophthalmology & Visual Science
|October 1, 1989
PubMed
Summary

Keratoconus corneas show significantly reduced keratan sulfate (KS) levels compared to normal corneas. This suggests altered KS structure or fewer KS chains in keratoconus, despite similar protein core levels.

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Area of Science:

  • Biochemistry
  • Ophthalmology
  • Proteoglycan Research

Background:

  • Corneal structure and function rely on proteoglycans, particularly keratan sulfate proteoglycan (KSPG).
  • Keratan sulfate (KS) is a key glycosaminoglycan component of corneal KSPG.
  • Alterations in corneal composition are associated with diseases like keratoconus.

Purpose of the Study:

  • To quantify and compare keratan sulfate (KS) and its core protein (KSPG) in normal versus keratoconus human corneas.
  • To investigate potential structural differences in KSPG between normal and keratoconus corneas.

Main Methods:

  • Utilized solid-phase immunoassay with monoclonal and polyclonal antibodies to detect KS and KSPG protein core.
  • Assayed guanidine-HCl corneal extracts using 125I-labeled secondary antibodies.
  • Quantified antigen levels against standard curves of purified bovine KSPG.

Main Results:

  • Keratoconus corneal extracts exhibited significantly lower KS-antigen levels (average 48% of normal, P < 0.001).
  • No significant difference was observed in KSPG core protein antigen levels between normal and keratoconus corneas.
  • These findings indicate a deficiency or structural modification of KS in keratoconus.

Conclusions:

  • Keratoconus is associated with reduced keratan sulfate content in the cornea.
  • The protein core of KSPG appears unaffected in keratoconus.
  • Results suggest altered KS glycosylation or chain length in keratoconus pathogenesis.

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