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Tamamura, R. and Nagatsuka, H. and Siar, C. H. and Katase, N. and Naito, I. and Sado, Y. and Nagai, N. (2006) Differential expression of basement membrane collagen-IV alpha l to alpha 6 chains during oral carcinogenes. Virchows Archiv, 449 (3). pp. 358-366. ISSN 0945-6317

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    Abstract

    This study aimed to resolve if basement membrane (BM) collagen alpha chains undergo remodeling during oral. carcinogenesis. Using immunohistochemistry and transmission electron microscopy, we found that BMs in oral epithelial dysplasias (OED: mild, n=10; moderate, n=10; severe, n=10) and carcinoma in situ (CIS) (n=10) differed from normal mucosa (n=6) and oral epithelial hyperplasia (n=5) in showing: (1) excessive lamina densa-like material ultrastructurally, and (2) stronger immunoexpression for alpha 5(IV) than for alpha 1(IV), alpha 2(IV), and alpha 6(IV) chains-findings that implicate these molecules' role as an adhesive template for the attachment and persistence of basal dysplastic cells. Incipient loss of BM integrity in CIS, where alpha 5(IV)/alpha 6(IV) chains were more frequently absent than alpha 1(IV)/alpha 2(IV) chains, suggests that alpha(IV) network disruption is crucial for progression of dysplastic cells into the extracellular compartment, marking transition into the invasive phase. In carcinomatous BM, the disappearance of alpha(IV) chains was more severe in poorly differentiated oral squamous cell carcinoma (OSCC) (n=10) than in well-differentiated OSCC (n=10). In all samples examined, alpha 3(IV) and alpha 4(IV) chains were absent. These findings taken together suggest that BM collagen-IV alpha chains undergo remodeling where selective increase and loss of these molecules are probably early and late events, respectively, during progression of oral dysplasia to cancer.

    Item Type: Article
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    Uncontrolled Keywords: collagen-IV chains epithelial dysplasia carcinoma in situ squamous cell carcinoma oral carcinogenesis defined monoclonal-antibodies cell carcinomas basal lamina tumors immunofluorescence localization progression prognosis proteins melanoma
    Subjects: Medicine and Dentistry > Clinical Dentistry
    Divisions: UNSPECIFIED
    Depositing User: Ms Nursyafiqah Abd Malek
    Date Deposited: 02 Nov 2012 01:49
    Last Modified: 02 Nov 2012 01:49
    URI: http://opendepot.org/id/eprint/1514

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