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Investigative Ophthalmology & Visual Science, Vol 34, 3585-3592, Copyright © 1993 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Alternatively spliced fibronectin molecules in the wounded cornea: analysis by PCR

X Cai, CS Foster, JJ Liu, AE Kupferman, M Filipec, RB Colvin and SJ Lee
Rhoads Molecular Immunology Laboratory, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston 02114.

PURPOSE. To determine whether certain fibronectin isoforms participate in corneal epithelial wound healing, the authors used the polymerase chain reaction to detect different splicing patterns of the EIIIA segment of fibronectin mRNA in epithelial scrape-wounded cornea of rats. METHODS. Specific fibronectin cDNA sequences synthesized from rat cornea with total RNA were amplified with various sets of synthetic oligonucleotide primers. RESULTS. The authors detected both the EIIIA+ and EIIIA- fibronectin mRNA isoforms during corneal wound healing. The kinetics of corneal expression of both total fibronectin mRNA and the EIIIA- fibronectin mRNA isoform was polyphasic; an initial decrease was followed by an increase at 45 minutes, a second increase at 2 hours, and a third increase at 4 days after wounding. EIIIA+ fibronectin mRNA, not found in normal cornea, also was detected during healing. CONCLUSIONS. The expression of total fibronectin mRNA and both the EIIIA+ and EIIIA- fibronectin mRNA is upregulated during corneal epithelial wound healing. The expression of EIIIA+ fibronectin mRNA during wound healing, a fibronectin isoform that was highly expressed in embryonic tissue, suggests that this fibronectin isoform is involved functionally in corneal wound healing.


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