Cellular Factor XIII, a Transglutaminase in Human Corneal Keratocytes

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Orosz , Z Z , Bardos , H , Shemirani , A H , Debreceni , I B , Lassila , R , Riikonen , A S , Hovinga , J A K , Seiler , T G , van Dorland , H A , Schroeder , V , Boda , Z , Nemes , L , Frueh Eppstein , B , Nagy , B , Facsko , A , Kappelmayer , J & Muszbek , L 2019 , ' Cellular Factor XIII, a Transglutaminase in Human Corneal Keratocytes ' , International Journal of Molecular Sciences , vol. 20 , no. 23 , 5963 . https://doi.org/10.3390/ijms20235963

Title: Cellular Factor XIII, a Transglutaminase in Human Corneal Keratocytes
Author: Orosz, Zsuzsanna Z.; Bardos, Helga; Shemirani, Amir H.; Debreceni, Ildiko Beke; Lassila, Riitta; Riikonen, Antti S.; Hovinga, Johanna A. Kremer; Seiler, Theo G.; van Dorland, Hendrika A.; Schroeder, Verena; Boda, Zoltan; Nemes, Laszlo; Frueh Eppstein, Beatrice; Nagy, Bence; Facsko, Andrea; Kappelmayer, Janos; Muszbek, Laszlo
Contributor: University of Helsinki, HUS Comprehensive Cancer Center
University of Helsinki, Silmäklinikka
Date: 2019-12
Language: eng
Number of pages: 17
Belongs to series: International Journal of Molecular Sciences
ISSN: 1422-0067
URI: http://hdl.handle.net/10138/310546
Abstract: Cellular factor XIII (cFXIII, FXIII-A(2)), a transglutaminase, has been demonstrated in a few cell types. Its main function is to cross-link proteins by isopeptide bonds. Here, we investigated the presence of cFXIII in cells of human cornea. Tissue sections of the cornea were immunostained for FXIII-A in combination with staining for CD34 antigen or isopeptide cross-links. Isolated corneal keratocytes were also evaluated by immunofluorescent microscopy and flow cytometry. FXIII-A in the corneal stroma was quantified by Western blotting. FXIII-A mRNA was detected by RT-qPCR. The cornea of FXIII-A-deficient patients was evaluated by cornea topography. FXIII-A was detected in 68 +/- 13% of CD34+ keratocytes. Their distribution in the corneal stroma was unequal; they were most abundant in the subepithelial tertile. cFXIII was of cytoplasmic localization. In the stroma, 3.64 ng cFXIII/mg protein was measured. The synthesis of cFXIII by keratocytes was confirmed by RT-qPCR. Isopeptide cross-links were detected above, but not within the corneal stroma. Slight abnormality of the cornea was detected in six out of nine FXIII-A-deficient patients. The presence of cFXIII in human keratocytes was established for the first time. cFXIII might be involved in maintaining the stability of the cornea and in the corneal wound healing process.
Subject: cornea
factor XIII
isopeptide bonds
keratocytes
transglutaminase
COAGULATION-FACTOR-XIII
PLATELET FACTOR-XIII
BLOOD-COAGULATION
SUBUNIT-A
TISSUE TRANSGLUTAMINASE
PLASMA
SURFACE
BONE
IDENTIFICATION
LOCALIZATION
1182 Biochemistry, cell and molecular biology
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