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Overexpression of p53 tumor suppressor protein in porokeratosis. 1994

J W Magee, and T H McCalmont, and P E LeBoit
Department of Pathology, University of California, San Francisco.

BACKGROUND p53 is a tumor suppressor nucleoprotein. Mutations of the p53 gene have been found in a variety of malignant neoplasms. Wild-type p53 has a short half-life, possibly only 20 to 30 minutes, and is not present in the nucleus at levels that are detectable with routine immunohistochemical techniques. Mutant p53 has a longer half-life, and is readily detectable with immunoperoxidase staining. RESULTS We studied 17 specimens from patients with either porokeratosis of Mibelli or actinic porokeratosis, using immunoperoxidase staining with an antibody directed against the p53. There was staining of lesional keratinocyte nuclei in 16 of 17 specimens, limited in most cases to the zone between cornoid lamellae. Staining for proliferating cell nuclear antigen was increased above background levels in only six of 13 specimens. CONCLUSIONS The finding of p53 immunoperoxidase staining in porokeratosis suggests genetic mutation, as occurs in other cutaneous keratinocytic neoplasms, and the lack of corresponding proliferating cell nuclear antigen expression in many specimens indicates that p53 overexpression is not simply a reflection of increased cellular proliferation.

UI MeSH Term Description Entries
D007124 Immunoenzyme Techniques Immunologic techniques based on the use of: (1) enzyme-antibody conjugates; (2) enzyme-antigen conjugates; (3) antienzyme antibody followed by its homologous enzyme; or (4) enzyme-antienzyme complexes. These are used histologically for visualizing or labeling tissue specimens. Antibody Enzyme Technique, Unlabeled,Enzyme Immunoassay,Enzyme-Labeled Antibody Technique,Immunoassay, Enzyme,Immunoperoxidase Techniques,Peroxidase-Antiperoxidase Complex Technique,Peroxidase-Labeled Antibody Technique,Antibody Enzyme Technic, Unlabeled,Enzyme-Labeled Antibody Technic,Immunoenzyme Technics,Immunoperoxidase Technics,Peroxidase-Antiperoxidase Complex Technic,Peroxidase-Labeled Antibody Technic,Antibody Technic, Enzyme-Labeled,Antibody Technic, Peroxidase-Labeled,Antibody Technics, Enzyme-Labeled,Antibody Technics, Peroxidase-Labeled,Antibody Technique, Enzyme-Labeled,Antibody Technique, Peroxidase-Labeled,Antibody Techniques, Enzyme-Labeled,Antibody Techniques, Peroxidase-Labeled,Enzyme Immunoassays,Enzyme Labeled Antibody Technic,Enzyme Labeled Antibody Technique,Enzyme-Labeled Antibody Technics,Enzyme-Labeled Antibody Techniques,Immunoassays, Enzyme,Immunoenzyme Technic,Immunoenzyme Technique,Immunoperoxidase Technic,Immunoperoxidase Technique,Peroxidase Antiperoxidase Complex Technic,Peroxidase Antiperoxidase Complex Technique,Peroxidase Labeled Antibody Technic,Peroxidase Labeled Antibody Technique,Peroxidase-Antiperoxidase Complex Technics,Peroxidase-Antiperoxidase Complex Techniques,Peroxidase-Labeled Antibody Technics,Peroxidase-Labeled Antibody Techniques,Technic, Enzyme-Labeled Antibody,Technic, Immunoenzyme,Technic, Immunoperoxidase,Technic, Peroxidase-Antiperoxidase Complex,Technic, Peroxidase-Labeled Antibody,Technics, Enzyme-Labeled Antibody,Technics, Immunoenzyme,Technics, Immunoperoxidase,Technics, Peroxidase-Antiperoxidase Complex,Technics, Peroxidase-Labeled Antibody,Technique, Enzyme-Labeled Antibody,Technique, Immunoenzyme,Technique, Immunoperoxidase,Technique, Peroxidase-Antiperoxidase Complex,Technique, Peroxidase-Labeled Antibody,Techniques, Enzyme-Labeled Antibody,Techniques, Immunoenzyme,Techniques, Immunoperoxidase,Techniques, Peroxidase-Antiperoxidase Complex,Techniques, Peroxidase-Labeled Antibody
D009687 Nuclear Proteins Proteins found in the nucleus of a cell. Do not confuse with NUCLEOPROTEINS which are proteins conjugated with nucleic acids, that are not necessarily present in the nucleus. Nucleolar Protein,Nucleolar Proteins,Nuclear Protein,Protein, Nuclear,Protein, Nucleolar,Proteins, Nuclear,Proteins, Nucleolar
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D015603 Keratinocytes Epidermal cells which synthesize keratin and undergo characteristic changes as they move upward from the basal layers of the epidermis to the cornified (horny) layer of the skin. Successive stages of differentiation of the keratinocytes forming the epidermal layers are basal cell, spinous or prickle cell, and the granular cell. Keratinocyte
D016147 Genes, Tumor Suppressor Genes that inhibit expression of the tumorigenic phenotype. They are normally involved in holding cellular growth in check. When tumor suppressor genes are inactivated or lost, a barrier to normal proliferation is removed and unregulated growth is possible. Antioncogenes,Cancer Suppressor Genes,Emerogenes,Genes, Cancer Suppressor,Genes, Growth Suppressor,Genes, Metastasis Suppressor,Growth Suppressor Genes,Metastasis Suppressor Genes,Tumor Suppressor Genes,Anti-Oncogenes,Genes, Onco-Suppressor,Oncogenes, Recessive,Tumor Suppressing Genes,Anti Oncogenes,Anti-Oncogene,Antioncogene,Cancer Suppressor Gene,Emerogene,Gene, Cancer Suppressor,Gene, Growth Suppressor,Gene, Metastasis Suppressor,Gene, Onco-Suppressor,Gene, Tumor Suppressing,Gene, Tumor Suppressor,Genes, Onco Suppressor,Genes, Tumor Suppressing,Growth Suppressor Gene,Metastasis Suppressor Gene,Onco-Suppressor Gene,Onco-Suppressor Genes,Oncogene, Recessive,Recessive Oncogene,Recessive Oncogenes,Suppressor Gene, Cancer,Suppressor Gene, Growth,Suppressor Gene, Metastasis,Suppressor Genes, Cancer,Suppressor Genes, Growth,Suppressor Genes, Metastasis,Tumor Suppressing Gene,Tumor Suppressor Gene
D016158 Genes, p53 Tumor suppressor genes located on the short arm of human chromosome 17 and coding for the phosphoprotein p53. Genes, TP53,TP53 Genes,p53 Genes,Gene, TP53,Gene, p53,TP53 Gene,p53 Gene
D017499 Porokeratosis A heritable disorder of faulty keratinization characterized by the proliferation of abnormal clones of KERATINOCYTES and lesions showing varying atrophic patches surrounded by an elevated, keratotic border. These keratotic lesions can progress to overt cutaneous neoplasm. Several clinical variants are recognized, including porokeratosis of Mibelli, linear porokeratosis, disseminated superficial actinic porokeratosis, palmoplantar porokeratosis, and punctate porokeratosis. Porokeratosis Palmaris et Plantaris Disseminata,Porokeratosis of Mibelli,Porokeratosis, Disseminated Superficial Actinic,Porokeratosis, Linear,Porokeratosis, Mibelli,Porokeratosis, Palmoplantar,Porokeratosis, Punctate,Disseminated Superficial Actinic Porokeratosis,Keratoderma Palmoplantar, Punctate Type 2,Porokeratosis Plantaris Palmaris et Disseminata,Porokeratosis Plantaris, Palmaris, Et Disseminata,Porokeratosis, Disseminated Superficial Actinic 2,Porokeratosis, Disseminated Superficial Actinic, 2,Porokeratosis, Palmar, Plantar, And Disseminated 1,Type 2 Punctate PPK,Linear Porokeratosis,Mibelli Porokeratosis,Palmoplantar Porokeratosis,Punctate Porokeratosis

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