title: Interactions of the p53 protein family in cellular stress response in gastrointestinal tumors.
abstract: p53, p63, and p73 are members of the p53 protein family involved in regulation of cell cycle, apoptosis, differentiation, and other critical cellular processes. Here, we investigated the contribution of the entire p53 family in chemotherapeutic drug response in gastrointestinal tumors. Real-time PCR and immunohistochemistry revealed complexity and variability of expression profiles of the p53 protein family. Using colon and esophageal cancer cells, we found that the integral transcription activity of the entire p53 family, as measured by the reporter analysis, associated with response to drug treatment in studied cells. We also found that p53 and p73, as well as p63 and p73, bind simultaneously to the promoters of p53 target genes. Taken together, our results support the view that the p53 protein family functions as an interacting network of proteins and show that cellular responses to chemotherapeutic drug treatment are determined by the total activity of the entire p53 family rather than p53 alone.
authors.affiliation: Department of Surgery and Cancer Biology, Vanderbilt University Medical School, Nashville, Tennessee, USA.
authors.forename: Anna E
authors.initials: AE
authors.lastname: Vilgelm
authors.forename: Mary K
authors.initials: MK
authors.lastname: Washington
authors.forename: Jinxiong
authors.initials: J
authors.lastname: Wei
authors.forename: Heidi
authors.initials: H
authors.lastname: Chen
authors.forename: Vladimir S
authors.initials: VS
authors.lastname: Prassolov
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Zaika
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000378:metabolism*; D000970:Antineoplastic Agents / Q000494:pharmacology / Q000627:therapeutic use; D054316:Biomarkers, Pharmacological / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D005472:Fluorouracil / Q000494:pharmacology / Q000627:therapeutic use; D005770:Gastrointestinal Neoplasms / Q000188:drug therapy / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic; D045325:HCT116 Cells; D006801:Humans; D005810:Multigene Family; D046912:Multiprotein Complexes / Q000378:metabolism; D009687:Nuclear Proteins / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000187:drug effects; D011485:Protein Binding; D020033:Protein Isoforms / Q000378:metabolism; D013312:Stress, Physiological / Q000502:physiology; D046888:Tissue Array Analysis; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors; D014407:Tumor Cells, Cultured; D000072160:Tumor Protein p73; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D025521:Tumor Suppressor Proteins / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D054316:Biomarkers, Pharmacological; D004268:DNA-Binding Proteins; D046912:Multiprotein Complexes; D009687:Nuclear Proteins; D020033:Protein Isoforms; C115051:TP63 protein, human; C000606460:TP73 protein, human; D015534:Trans-Activators; D014157:Transcription Factors; D000072160:Tumor Protein p73; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D005472:Fluorouracil