Abstract:
PURPOSE:Membrane-associated mucins are important components of the ocular tear film. Our objective was to characterize the expression of membrane-associated mucins MUC1, MUC4, and MUC16 in healthy cornea, healthy conjunctiva, fibrovascular tissue (pannus) covering the corneal surface in limbal stem cell deficiency (LSCD), human limbal epithelial cells cultivated on intact amniotic membrane (HLEC-AM), and corneal epithelium after transplantation of cultivated limbal epithelium (TCLE). METHODS:Total RNA was isolated from six samples of healthy human cornea, healthy conjunctiva, pannus, limbal epithelial cell cultures, and four corneal samples after TCLE. The expression of MUC1, MUC4, and MUC16 was evaluated by real-time polymerase chain reaction (PCR), Western blotting, and immunofluorescence. RESULTS:Conjunctiva showed a significantly higher expression of MUC1 and MUC4 than cornea, but the expression of MUC16 was similar in both tissues. The expression of MUC1 in HLEC-AM increased, MUC16 decreased, and MUC4 showed no significant difference when compared to cornea. The expression of all studied mucins in conjunctiva was significantly higher than in HLEC-AM. Pannus revealed a similar expression pattern of membrane-associated mucins to conjunctiva. The expression of all studied mucins in pannus was significantly higher than in cornea or HLEC-AM. A corneal expression pattern of membrane-associated mucins was found in all four samples of cornea after TCLE. CONCLUSION:A tissue-specific expression of MUC1 and MUC4 but not MUC16 was found in human cornea and conjunctiva. LSCD led to a conjunctival expression pattern of mucins on the corneal surface. A corneal phenotype could be restored after TCLE, confirming the potential of this method to reconstruct the corneal surface.
journal_name
Curr Eye Resjournal_title
Current eye researchauthors
Pauklin M,Kakkassery V,Steuhl KP,Meller Ddoi
10.1080/02713680802699408subject
Has Abstractpub_date
2009-03-01 00:00:00pages
221-30issue
3eissn
0271-3683issn
1460-2202pii
909312034journal_volume
34pub_type
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