title: Mutant p53 R248Q but not R248W enhances in vitro invasiveness of human lung cancer NCI-H1299 cells.
abstract: More than half of all human cancers are associated with mutations of the TP53 gene. In regard to the functional interaction with the remaining wild-type (WT) p53 allele, p53 mutations are classified into two types, recessive and dominant-negative (DN) mutations. The latter mutant protein has a DN activity over the remaining WT allele. We previously showed that the DN p53 mutant was useful as a predictor of poor outcome or a risk factor for metastatic recurrence in patients with some types of cancers, regardless of the presence or absence of loss of heterozygosity (LOH) of WT p53, suggesting that the DN p53 had 'gain-of-function (GOF)' activity besides the transdominance function. In this study, we investigated GOF activity of two DN p53 mutants which had a point mutation at codon 248 (R248Q and R248W), one of the hot spots, by transfecting them respectively into H1299 cells which originally expressed no p53 protein. Growth activity of the transfectants with the two mutants was not different from that of parent or Mock transfectants. Meanwhile, in vitro invasions of Matrigel and type I collagen gel by R248Q-transfectants were significantly higher than those by R248W-transfectants or the control cells. However, there were no differences in cell motile activities, expressions of extracellular matrix-degradative enzymes such as matrix metalloproteinases, urokinase-type plasminogen activator and heparanase, and their inhibitors, between R248Q- and R248W-transfectants. These findings indicate that the p53 mutants have a different quality in GOF activities even if the mutations occurred at the same codon. And detailed information of the status of p53, including transdominancy and GOF activity, is expected to be useful for diagnosis and therapeutic strategy fitting the individual patients.
authors.affiliation: Oral Diagnosis and Oral Medicine, Department of Oral Pathological Science, Graduate School of Dental Medicine, Hokkaido University, Kita-ku, Sapporo, Japan.
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Yoshikawa
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Hamada
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Tada
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kameyama
authors.forename: Koji
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Mayumi
authors.initials: M
authors.lastname: Ikawa
authors.forename: Nur Mohammad Monsur
authors.initials: NM
authors.lastname: Hassan
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Kitagawa
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Moriuchi
mesh_terms: D000483:Alleles; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D045744:Cell Line, Tumor; D003062:Codon; D016158:Genes, p53; D006801:Humans; D019656:Loss of Heterozygosity; D008175:Lung Neoplasms / Q000235:genetics*; D017354:Point Mutation; D014162:Transfection; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism
chemical_list: D003062:Codon; D016159:Tumor Suppressor Protein p53