ISSN:
1434-4726
Schlagwort(e):
Enzyme histochemistry
;
Covalent crosslinking
;
Cell envelope
;
Epidermal transglutaminase
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Medizin
Notizen:
Summary A histochemical study was performed to determine the involvement of epidermal transglutaminase (ETgase) in the keratinization of middle ear cholesteatomatous lesions, and to compare it with its role in the middle ear mucosa and epidermis. In a first assay, we localized the (E)Tgase activity in situ. A second immunohistochemical assay revealed the distribution of the particulate form of ETgase, which is involved in cross-linked envelope formation. A remarkable difference between strongly keratinized epidermal tissues and the cholesteatoma matrix is the frequent observation in the latter of the remnants of (E)Tgase activity in cytosol, even in advanced stages of differentiation. As a consequence, the cell-membrane-associated ETgase activity, and thus the extent of cross-linking within the envelope, is at a lower level than expected. This aspect is reminiscent of the keratinization phenomenon manifested by thin epidermal tissues. In addition, our findings are the first to show that ETgase is a substantial marker of middle ear mucosa.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00176544
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