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Human preocular mucins reflect changes in surface physiology.

M Berry¹, R B Ellingham, A P Corfield

¹Division of Ophthalmology, University of Bristol, Bristol Eye Hospital, Lower Maudlin Street, Bristol BS1 2LX, UK. man.berry@bristol.ac.uk

The British Journal of Ophthalmology

|February 24, 2004

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Ocular surface mucins undergo structural changes in dry eye disease. Alterations in mucin glycosylation and size in symptomatic individuals suggest preocular changes that may precede clinical signs of dry eye.

Area of Science:

Ophthalmology
Biochemistry
Surface Science

Background:

Mucin function depends on peptide core and glycosylation.
Tear film mucins are crucial for ocular surface health.
Structural changes in mucins may reflect ocular surface physiology.

Purpose of the Study:

To investigate structural alterations in ocular surface mucins.
To determine if these changes correlate with ocular surface physiology.
To assess mucin characteristics in normal and dry eye symptomatic individuals.

Main Methods:

Collected ocular surface mucus via N-acetyl cysteine (NAcCys) washes and post-cataract surgery samples.
Extracted mucins using guanidine hydrochloride (GuHCl) with protease inhibitors.

Related Experiment Videos

Assessed mucin glycosylation density (buoyant density) and peptide core reactivity, and hydrodynamic volume (gel filtration).

Main Results:

Identified MUC1, MUC2, MUC4, and MUC5AC in ocular surface mucus.
Normal individuals showed higher glycosylation in MUC2 and MUC5AC compared to symptomatic individuals.
Surface mucins were smaller than intracellular mucins, with MUC2 size differing between normal and symptomatic groups.

Conclusions:

Reduced surface mucin size suggests post-secretory cleavage.
Altered mucin glycosylation and size distribution in symptomatic individuals indicate preocular changes.
These mucin alterations may precede the development of clinical dry eye signs.