title: Expression of caspase 14 and filaggrin in oral squamous carcinoma.
abstract: Caspase 14 is one of the latter discovered members of the caspase enzyme family and, although sharing sequence homologies with the other caspases, it is not involved in apoptosis. Together with its co-factor filaggrin, it plays an important role in skin barrier formation. It is already known that caspase 14 proteins are reduced during neoplastic dedifferentiation in cervical intraepithelial neoplasms and in invasive cervical carcinomas. Oral squamous carcinoma tissues have not been systematically evaluated for caspase 14 expression yet. Formalin-fixed and paraffin-embedded samples from oral squamous carcinomas (n = 36 tumours from 34 patients), metastases (n = 15) and controls (leukoplakia, n = 10) were analysed by immunohistochemistry. In carcinomas, human papilloma virus (HPV) infection was tested by PCR. Here we demonstrate that, in oral epithelia, caspase 14 is expressed mainly by cells of the intermediate and superficial cell layers while filaggrin is expressed only in keratinising foci in leukoplakia. Caspase 14 and filaggrin are co-localised. In invasive oral carcinomas, reduced expression of caspase 14 was detectable in 47 % of tumours but was not associated with keratinisation, tumour differentiation or HPV infection. Filaggrin was detectable in a subfraction of tumours (56 %) and was restricted to keratinising areas of the carcinomas. In summary, in contrast to cervical carcinomas, partial loss of caspase 14 is not associated with dedifferentiation in neoplastic lesions of the oral mucosa or HPV infection.
authors: Institute of Pathology, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany.
authors: Constance
authors: C
authors: Scharenberg
authors: André
authors: A
authors: Eckardt
authors: Christina
authors: C
authors: Tiede
authors: Hans
authors: H
authors: Kreipe
authors: Kais
authors: K
authors: Hussein
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis*; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology / Q000821:virology; D020169:Caspases / Q000032:analysis / Q000096:biosynthesis*; D005260:Female; D000091344:Filaggrin Proteins; D006801:Humans; D007150:Immunohistochemistry; D007381:Intermediate Filament Proteins / Q000032:analysis / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000821:virology; D030361:Papillomavirus Infections / Q000378:metabolism / Q000473:pathology; D055815:Young Adult
chemical_list: D014408:Biomarkers, Tumor; C000717249:FLG protein, human; D000091344:Filaggrin Proteins; D007381:Intermediate Filament Proteins; C506446:CASP14 protein, human; D020169:Caspases
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