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Apoptosis, proliferation and p12(doc-1) profiles in normal, dysplastic and malignant squamous epithelium of the Syrian hamster cheek pouch model.

Oral oncology (2002-04-30)
Yohko Kohno, Vipul Patel, Yong Kim, Takanori Tsuji, Byung Rho Chin, Moyi Sun, R Bruce Donoff, Ralph Kent, David Wong, Randy Todd
ABSTRACT

Disruption of the homeostatic balance between proliferation and apoptosis is widely believed to contribute to human oral carcinogenesis. Using the Syrian hamster oral cancer model, we examined normal, hyperplastic, dysplastic and malignant oral epithelium for the fraction of apoptotic, proliferating and p12(doc-1) expressing keratinocytes using the TUNEL assay, as well as PCNA and p12(doc-1) immunostaining, respectively. The percentage of TUNEL positive cells progressively increased from normal to dysplastic epithelium (P<0.0019), but returned to normal keratinocyte levels in the malignant epithelium (P<0.20). However, PCNA positive cells increased progressively through hamster oral malignant progression (P<0.0012). The overall ratio of apoptotic to proliferating keratinocytes remains similar until the transition between dysplastic and malignant epithelium, where the ratio is markedly reduced (P<0.05). p12(doc-1) labeling demonstrated a similar expression pattern (P<0.008). This study demonstrates that apoptosis, proliferation and the expression of p12(doc-1) reflects alterations reported during human oral carcinogenesis and supports the use of the Syrian hamster model for the further examination of these pathways.

MATERIALS
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Brand
Product Description

Sigma-Aldrich
7,12-Dimethylbenz[a]anthracene, ≥95%