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Calcifying epithelial odontogenic (Pindborg) tumor-associated amyloid consists of a novel human protein
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2003 (English)In: Journal of Laboratory and Clinical Medicine, ISSN 0022-2143, Vol. 142, no 5, 348-355 p.Article in journal (Refereed) Published
Abstract [en]

Calcifying epithelial odontogenic tumors (CEOTs), also known as Pindborg tumors, are characterized by the presence of squamous-cell proliferation, calcification, and, notably, amyloid deposits. On the basis of immunohistochemical analyses, the amyloidogenic component had heretofore been deemed to consist of cytokeratin-related or other molecules, however, its chemical composition had never been elucidated. We have used our microanalytic techniques to characterize the protein nature of CEOT-associated amyloid isolated from specimens obtained from 3 patients. As evidenced by the results of amino-acid sequencing and mass spectrometry, the fibrils were found to be composed of a polypeptide of approximately 46 mer. This component was identical in sequence to the N-terminal portion of a hypothetical 153-residue protein encoded by the FLJ20513 gene cloned from the human KATO III cell line. That the amyloid protein was derived from this larger molecule was demonstrated by reverse transcription-polymerase chain reaction amplification of tumor-cell RNA where a full-length FLJ20513 transcript was found. Furthermore, immunohistochemical analyses revealed that the amyloid within the CEOTs immunostained with antibodies prepared against a synthetic FLJ20513-related dodecapeptide. Out studies provide unequivocal evidence that CEOT-associated amyloid consists of a unique and previously undescribed protein that we provisionally designate APin.

Place, publisher, year, edition, pages
2003. Vol. 142, no 5, 348-355 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-47737DOI: 10.1016/S0022-2143(03)00149-5OAI: diva2:268633
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-13

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Westermark, Gunilla
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