title: Analysis of the intracellular localization of p73 N-terminal protein isoforms TAp73 and ∆Np73 in medulloblastoma cell lines.
abstract: The protein homologous to the tumor suppressor p53, p73, has essential roles in development and tumorigenesis. This protein exists in a wide range of isoforms with different, even antagonistic, functions. However, there are virtually no detailed morphological studies analyzing the endogenous expression of p73 isoforms at the cellular level in cancer cells. In this study, we investigated the expression and subcellular distribution of two N-terminal isoforms, TAp73 and ΔNp73, in medulloblastoma cells using immunofluorescence microscopy. Both proteins were observed in all cell lines examined, but differences were noted in their intracellular localization between the reference Daoy cell line and four newly established medulloblastoma cell lines (MBL-03, MBL-06, MBL-07 and MBL-10). In the new cell lines, TAp73 and ΔNp73 were located predominantly in cell nuclei. However, there was heterogeneity in TAp73 distribution in the cells of all MBL cell lines, with the protein located in the nucleus and also in a limited non-random area in the cytoplasm. In a small percentage of cells, we detected cytoplasmic localization of TAp73 only, i.e., nuclear exclusion was observed. Our results provide a basis for future studies on the causes and function of distinct intracellular localization of p73 protein isoforms with respect to different protein-protein interactions in medulloblastoma cells.
authors.affiliation: Department of Experimental Biology, School of Science, Masaryk University, Brno, Czech Republic.
authors.forename: Marta
authors.initials: M
authors.lastname: Nekulová
authors.forename: Karel
authors.initials: K
authors.lastname: Zitterbart
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Sterba
authors.forename: Renata
authors.initials: R
authors.lastname: Veselská
mesh_terms: D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D005260:Female; D006801:Humans; D042541:Intracellular Space / Q000378:metabolism*; D008297:Male; D008527:Medulloblastoma / Q000378:metabolism* / Q000473:pathology; D009687:Nuclear Proteins / Q000737:chemistry / Q000378:metabolism*; D020033:Protein Isoforms / Q000378:metabolism; D021381:Protein Transport; D000072160:Tumor Protein p73; D025521:Tumor Suppressor Proteins / Q000737:chemistry / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D020033:Protein Isoforms; C000606460:TP73 protein, human; D000072160:Tumor Protein p73; D025521:Tumor Suppressor Proteins; C000606369:delta Np73 protein, human
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