TP53 mutations in clinically normal mucosa adjacent to oral carcinomas

TY - JOUR

T1 - TP53 mutations in clinically normal mucosa adjacent to oral carcinomas

AU - Thode, C

AU - Bilde, A

AU - Von Buchwald, C

AU - Dabelsteen, Erik

N1 - © 2010 John Wiley & Sons A/S.

PY - 2010/10

Y1 - 2010/10

N2 - BACKGROUND: The tumour-suppressor protein p53 often accumulates in histologically normal epithelium adjacent to oral squamous cell carcinomas (OSCC). We investigated whether this was associated with mutations in TP53, the gene for p53, and might implicate impending malignancy.METHODS: Specimens from 18 human squamous cell carcinomas were stained with monoclonal p53 antibodies. Positive cells were microdissected with laser-captured microscopy from the tumour and adjacent normal and dysplastic epithelium. DNA was extracted, and exons 5-9 of the TP53 gene were amplified by PCR. Amplified products were separated by denatured gradient gel electrophoresis. Fragments with a deviant DGEE pattern were sequenced.RESULTS: TP53 mutations were found in six of 18 tumours. Fourteen specimens contained histologically normal mucosa adjacent to the tumour; 13 of these showed small clusters of p53 positive cells. Seven specimens contained both histological normal and dysplastic epithelial tissues adjacent to the tumour. A TP53 mutation was found in only one specimen; this mutation appeared in the normal mucosa, the adjacent tumour, and the epithelial dysplasia.CONCLUSION: We found that upregulation of p53 was a frequent event in histological normal mucosa adjacent to OSCC; however, it was rarely associated with a mutation in the TP53 gene.

AB - BACKGROUND: The tumour-suppressor protein p53 often accumulates in histologically normal epithelium adjacent to oral squamous cell carcinomas (OSCC). We investigated whether this was associated with mutations in TP53, the gene for p53, and might implicate impending malignancy.METHODS: Specimens from 18 human squamous cell carcinomas were stained with monoclonal p53 antibodies. Positive cells were microdissected with laser-captured microscopy from the tumour and adjacent normal and dysplastic epithelium. DNA was extracted, and exons 5-9 of the TP53 gene were amplified by PCR. Amplified products were separated by denatured gradient gel electrophoresis. Fragments with a deviant DGEE pattern were sequenced.RESULTS: TP53 mutations were found in six of 18 tumours. Fourteen specimens contained histologically normal mucosa adjacent to the tumour; 13 of these showed small clusters of p53 positive cells. Seven specimens contained both histological normal and dysplastic epithelial tissues adjacent to the tumour. A TP53 mutation was found in only one specimen; this mutation appeared in the normal mucosa, the adjacent tumour, and the epithelial dysplasia.CONCLUSION: We found that upregulation of p53 was a frequent event in histological normal mucosa adjacent to OSCC; however, it was rarely associated with a mutation in the TP53 gene.

KW - Carcinoma, Squamous Cell

KW - DNA Mutational Analysis

KW - Denaturing Gradient Gel Electrophoresis

KW - Epithelial Cells

KW - Humans

KW - Microdissection

KW - Mouth Mucosa

KW - Mouth Neoplasms

KW - Tumor Suppressor Protein p53

KW - Up-Regulation

U2 - 10.1111/j.1600-0714.2010.00916.x

DO - 10.1111/j.1600-0714.2010.00916.x

M3 - Journal article

C2 - 20738752

SN - 0904-2512

VL - 39

SP - 662

EP - 666

JO - Journal of Oral Pathology & Medicine

JF - Journal of Oral Pathology & Medicine

IS - 9

ER -