Abstract
The staining of nucleolar organizer regions (NORs), which equate to rDNA transcription, was applied to chemically induced-lesions of the hamster cheek pouch. The cheek pouches of 16 male golden Syrian hamsters were treated three times a week with 0.5% 7,12-dimethylbenz[a]anthracene (DMBA) in mineral oil for 16 weeks. The percentage of gathered-type NORs with high activity nucleoli increased in the pouch epithelium during DMBA treatment and reached the highest values in malignant tumors. The percentage of dispersed-type NORs also increased in the malignant lesions. However, the absolute number of NORs was not affected by DMBA treatment. These results suggest that DMBA induces modification of NOR activity at the early stages of carcinogenesis and shows the potential of this model for studying NOR alterations in neoplasia.
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Schedule a callMore From: Journal of oral pathology & medicine : official publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology
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