RGD Reference Report - Genetic polymorphisms of carcinogen metabolizing enzymes are associated with oral leukoplakia development and p53 overexpression. - Rat Genome Database

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Genetic polymorphisms of carcinogen metabolizing enzymes are associated with oral leukoplakia development and p53 overexpression.

Authors: Duarte, Eliza Carla Barroso  Ribeiro, Daniela Cotta  Gomez, Marcus Vinícius  Ramos-Jorge, Maria Letícia  Gomez, Ricardo Santiago 
Citation: Duarte EC, etal., Anticancer Res. 2008 Mar-Apr;28(2A):1101-6.
RGD ID: 14700975
Pubmed: (View Article at PubMed) PMID:18507060


BACKGROUND: Genetic polymorphisms of carcinogen-metabolizing enzyme genes have been associated with the risk of oral squamous cell carcinoma and oral leukoplakia. The overexpression of p53 protein is the most common genetic alteration in head and neck cancer. In the present study the combined or isolated presence of glutathione S-transferases GSTM1, GSTT1, GSTP1, and the cytochrome P450 oxidases CYP1A1 and CYP2E1 polymorphisms and oral leukoplakia development in a Brazilian sample of individuals was investigated, together with the effect of these polymorphisms on p53 overexpression in the lesions.
PATIENTS AND METHODS: The GSTM1, GSTT1 and CYP1A1 genotypes of 80 smoking patients with oral leukoplakia and 80 age and gender matched control subjects were studied by polymerase chain reaction (PCR), and CYP2E1 and GSTP1 polymorphisms by PCR and digestion. Immunohistochemical reactions were performed for p53 staining in paraffin embedded histological sections of oral leukoplakia lesions.
RESULTS: The GSTM1 null genotype was associated with an increased risk of oral leukoplakia development, independently of the other genes (OR 2.10). The simultaneous presence of GSTM1 and GSTT1 null genotypes was associated with an increased risk of oral leukoplakia development, independently of the other genes (OR 4.36). The oral leukoplakia lesions of patients with the GSTT1 null genotype showed a 6-fold increased risk of p53 overexpression (OR 6.61).
CONCLUSION: A positive association exists between the isolated or combined null genotype of GSTM1 and GSTT1 and oral leukoplakia development and the null GSTT1 genotype shows increased risk of p53 overexpression, in oral leukoplakia.

Annotation

Disease Annotations    

Objects Annotated

Genes (Rattus norvegicus)
Gstm1  (glutathione S-transferase mu 1)
Gstt1  (glutathione S-transferase theta 1)

Genes (Mus musculus)
Gstm1  (glutathione S-transferase, mu 1)
Gstt1  (glutathione S-transferase, theta 1)

Genes (Homo sapiens)
GSTM1  (glutathione S-transferase mu 1)
GSTT1  (glutathione S-transferase theta 1)


Additional Information