IOVS Journal of Biological Chemistry
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(Investigative Ophthalmology and Visual Science. 2001;42:549-556.)
© 2001 by The Association for Research in Vision and Ophthalmology, Inc.

Elevated Expression of Transglutaminase 1 and Keratinization-Related Proteins in Conjunctiva in Severe Ocular Surface Disease

Takahiro Nakamura1, Kohji Nishida1, Atsuyoshi Dota1, Masato Matsuki2, Kiyofumi Yamanishi2 and Shigeru Kinoshita1

1 From the Departments of Ophthalmology and 2 Dermatology, Kyoto Prefectural University of Medicine, Japan.

PURPOSE. In severe ocular surface diseases, pathologic keratinization of the ordinarily nonkeratinized corneal and conjunctival mucosal epithelia results in severe visual loss. The expression in conjunctivalized corneas of various proteins known to play important roles in the physiological keratinization process in human epidermis was examined to better understand the mechanism of keratinization.

METHODS. Conjunctiva covering the cornea was examined in 12 eyes with ocular surface disease in the chronic cicatricial phase. These comprised four Stevens–Johnson syndrome, four ocular cicatricial pemphigoid, and four chemical injuries. Normal conjunctivas from four age-matched individuals served as controls. Semiquantitative reverse transcription–polymerase chain reaction (RT-PCR) was used to investigate transglutaminase 1 gene expression and immunohistochemistry to study the expression of transglutaminase 1 protein along with other keratinization-related proteins (involucrin, loricrin, filaggrin, and cytokeratins 1 and 10) and cytokeratin pairs 4/13 and 3/12.

RESULTS. Semiquantitative RT-PCR showed that transglutaminase 1 mRNA expression was upregulated in keratinized conjunctiva compared with normal. Also, in this tissue, immunohistochemistry demonstrated elevated levels of transglutaminase 1, involucrin, filaggrin, and the cytokeratin pair 1/10. Levels of loricrin and cytokeratin pairs 4/13 and 3/12, however, remained the same.

CONCLUSIONS. Various keratinization-related proteins, transglutaminase 1 included, are most likely involved in the pathogenesis of cicatrizing ocular surface diseases.




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