title: Expression of p73 in normal skin and proliferative skin lesions.
abstract: The p73 gene is a member of the p53 gene family and the structure and functions of p73 protein are similar to those of p53. However, these two proteins have different roles. In the present study, p73 protein was found immunohistochemically to be distributed in the basal cells of the epidermis, columnar basal cells in the hair follicle and peripheral cells without lipid droplets in the sebaceous and meibomian glands; it was expressed strongly in tumor cells in basal cell carcinomas and in the basal cell-like cells in seborrheic keratosis, and weakly or negatively in the squamous cell-like cells in seborrheic keratosis and in the tumor cells in squamous cell carcinomas. No relationship was detected between p73 and p53 protein distribution and between p73 protein expression and the proliferative potential, as shown by the Ki-67 immunopositive cell ratio. The present study shows that p73 protein is likely to play important roles in skin differentiation rather than proliferation or carcinogenesis of the skin.
authors.affiliation: Department of Pathology, Gunma University School of Medicine, 3-39-22 Showa, Maebashi, Gunma 371-8511, Japan. nkamiya@med.gunna-u.ac.jp
authors.forename: Makoto
authors.initials: M
authors.lastname: Kamiya
authors.forename: Yuko
authors.initials: Y
authors.lastname: Takeuchi
authors.forename: Mari
authors.initials: M
authors.lastname: Katho
authors.forename: Hideaki
authors.initials: H
authors.lastname: Yokoo
authors.forename: Atsushi
authors.initials: A
authors.lastname: Sasaki
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Nakazato
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis*; D002280:Basal Cell Carcinoma / Q000378:metabolism / Q000473:pathology; D049109:Cell Proliferation; D004268:DNA-Binding Proteins / Q000096:biosynthesis*; D016147:Genes, Tumor Suppressor; D006801:Humans; D007150:Immunohistochemistry; D017492:Keratosis, Seborrheic / Q000378:metabolism / Q000473:pathology; D019394:Ki-67 Antigen / Q000378:metabolism; D018307:Neoplasms, Squamous Cell / Q000378:metabolism / Q000473:pathology; D009687:Nuclear Proteins / Q000096:biosynthesis*; D012867:Skin / Q000378:metabolism*; D012871:Skin Diseases / Q000378:metabolism* / Q000473:pathology; D012878:Skin Neoplasms / Q000378:metabolism / Q000473:pathology; D000072160:Tumor Protein p73; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis; D025521:Tumor Suppressor Proteins
chemical_list: D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; D019394:Ki-67 Antigen; D009687:Nuclear Proteins; C000606460:TP73 protein, human; D000072160:Tumor Protein p73; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins