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Related Experiment Video

Updated: Jun 7, 2026

A Protein Suspension-Trapping Sample Preparation for Tear Proteomics by Liquid Chromatography-Tandem Mass Spectrometry
08:20

A Protein Suspension-Trapping Sample Preparation for Tear Proteomics by Liquid Chromatography-Tandem Mass Spectrometry

Published on: December 1, 2023

Tear proteomics in keratoconus.

Catherine Pannebaker1, Heather L Chandler, Jason J Nichols

  • 1College of Optometry, The Ohio State University, Columbus, OH 43210, USA.

Molecular Vision
|October 30, 2010
PubMed
Summary

Researchers identified specific tear-film proteins linked to keratoconus, a corneal condition. Matrix metalloproteinase-1 (MMP-1) was notably increased in keratoconus patients, suggesting potential biomarkers for this eye disease.

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Area of Science:

  • Ophthalmology
  • Proteomics
  • Biochemistry

Background:

  • Keratoconus is a progressive eye condition affecting corneal shape.
  • Tear film analysis offers a non-invasive method to study ocular surface diseases.
  • Identifying specific proteins in the tear film may reveal disease mechanisms.

Purpose of the Study:

  • To identify proteins in the tear film that are differentially expressed in keratoconus patients.
  • To explore potential tear-film biomarkers for keratoconus diagnosis and understanding.

Main Methods:

  • Tear samples were collected from normal subjects and keratoconus patients (contact lens wearers and non-wearers).
  • Proteomic techniques including Bradford assays, cytokine arrays, SDS-PAGE, and mass spectrometry were employed.
  • Clinical data, visual acuity, and corneal topography were also assessed.

Main Results:

  • Several proteins were found to be potentially unique to keratoconus.
  • Matrix metalloproteinase-1 (MMP-1) showed increased expression in keratoconus subjects (p=0.02).
  • Other associated proteins included keratins, immunoglobulins, prolactin precursors, lysozyme C, and lipocalin.

Conclusions:

  • Keratoconus appears to be associated with altered expression of specific tear-film proteins.
  • Further research is required to establish a causal link or correlation with keratoconus etiology.

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