Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P04637 (p53)
 77,613 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Oral papilloma is the most frequent benign tumor of the oral cavity but its biological potential for malignant transformation is still to be evaluated. The alteration of apoptosis and uncontrolled cell proliferation is considered to be an important factor in oral tumorigenesis. The aim of our study was to evaluate by immunohistochemistry P53, Bcl-2, CD44 and PCNA expression in oral papillomas with and without dysplasia. We examined a series of 55 oral papillomas, including 12(21.8%) cases of papillomas with epithelial dysplasia. Staining patterns were correlated with sex, age, tumor location, size and presence or absence of epithelial dysplasia. P53 showed positive reaction in 70.9%, PCNA in 80%, CD44 in 50.9% and Bcl-2 in 21.8% of papillomas. There was no correlation between sex, age, tumor size, location and presence of dysplastic epithelium in papillomas. We observed a statistically significant correlation between Bcl-2, CD44 expression and presence of epithelial dysplasia in papillomas. Coexistence of PCNA and P53 positive immunostaining was observed. Papillomas with overexpression of P53 and PCNA showed negative reaction for CD44 protein. The results of our study suggest that overexpression of P53 and PCNA might be an early event in oral tumorigenesis, whereas CD44 and Bcl-2 are potential markers of epithelial dysplasia in oral papillomas.
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PMID:The expression of tumorigenesis markers in oral papilloma. 1259 36

Immunosuppressed renal transplant recipients (RTRs) are predisposed to non-melanoma skin cancers (NMSCs), predominantly squamous cell carcinomas (SCCs). We have analyzed skin lesions from RTRs with aggressive tumors for p53 gene modifications, the presence of Human Papillomas Virus (HPV) DNA in relation to the p53 codon 72 genotype and polymorphisms of the XPD repair gene. We detected 24 p53 mutations in 15/25 (60%) NMSCs, 1 deletion and 23 base substitutions, the majority (78%) being UV-specific C to T transitions at bipyrimidine sites. Importantly, 35% (6/17) are tandem mutations, including 4 UV signature CC to TT transitions possibly linked to modulated DNA repair caused by the immunosuppressive drug cyclosporin A (CsA). We found 8 p53 mutations in 7/17 (41%) precancerous actinic keratosis (AK), suggesting that p53 mutations are early events in RTR skin carcinogenesis. Immunohistochemical analysis shows a good correlation between p53 accumulation and mutations. HPV DNA was detected in 78% of skin lesions (60% Basal Cell Carcinomas, 82%AK and 79% SCCs). Thus, immunosuppression has increased the risk of infections by HPVs, predominantly epidermodysplasia verruciformis, speculated to play a role in skin cancer development. No association is found between HPV status and p53 mutation. Moreover, p53 codon 72 or frequencies of three XPD genotypes of RTRs are comparable with control populations. The p53 mutation spectrum, presenting a high level of CC to TT mutations, shows that the UV component of sunlight is the major risk factor and modulated DNA repair by immunosuppressive drug treatment may be significant in the skin carcinogenesis of RTRs.
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PMID:Analysis of skin cancer risk factors in immunosuppressed renal transplant patients shows high levels of UV-specific tandem CC to TT mutations of the p53 gene. 1706 98

Papillomas and squamous cell carcinomas are the most common conjunctival and eyelid lesions. The etiology is still unclear and recently human papillomavirus infection and p53 gene mutation have been taken into consideration. The aim of our study was the evaluation of HPV DNApresence and p53 gene mutation in 45 benign and 38 malignant squamous lesions of the conjunctiva and eyelid. For HPV detection PCR-RFLP and immunohistochemical reaction were used; for p53 gene mutation PCR-SSCP was used. Only 8.8% papillomas, 9.1% squamous cell cancers and 3.7% basal cell cancers (using PCR-RFLP method) and 26.6% papillomas, 7.4% squamous cell cancers and 9.1% basal cell cancers (using immunohisto-chemical reaction) were HPV positive. p53 gene mutation was evaluated in 24.4% papillomas, 54.5% squamous cell cancers and 22.2% basal cell cancers; most commonly in 6 and 7 exon. Human papillomavirus infection, opposite to p53 gene mutation, is not a significant etiological factor of the benign and malignant conjunctival and eyelid lesions development.
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PMID:The evaluation of human papillomavirus and p53 gene mutation in benign and malignant conjunctiva and eyelid lesions. 2147 94