Maspin subcellular expression in wild-type and mutant TP53 gastric cancers  

作　　者：Simona Gurzu Ioan Jung Haruhiko Sugimura Raluca Ioana Stefan-van Staden Hidetaka Yamada Hiroko Natsume Yuji Iwashita Rita Szodorai Janos Szederjesi 

机构地区：[1]Department of Pathology,George Emil Palade University of Medicine,Pharmacy,Sciences and Technology,Technology,Targu Mureș540139,Mureș,Romania [2]Research Center,George Emil Palade University of Medicine,Pharmacy,Sciences and Technology,Targu Mureș540139,Mureș,Romania [3]Department of Tumor Pathology,Hamamatsu University School of Medicine,Hamamatsu 431-3192,Japan [4]National Institute of Research for Electrochemistry and Condensed Matter,Bucharest 060021,Romania [5]Intensive Care Unit,George Emil Palade University of Medicine,Pharmacy,Sciences and Technology,Targu Mureș540139,Mureș,Romania

出　　处：《World Journal of Gastrointestinal Oncology》2020年第7期741-755,共15页世界胃肠肿瘤学杂志（英文版）（电子版）

基　　金：the Romanian National Authority for Scientific Research;No.20 PCCF/2018。

摘　　要：BACKGROUND Although the role of p53 in the evolution and prognosis of gastric cancer(GC)has been extensively examined,the exact mechanism of action is incompletely understood.In the last years,p53-target genes were supposed to be involved in the p53 pathway.One of them is the tumor-suppressor gene Maspin,which codifies the protein with the same name.Maspin activity depends on its subcellular localization.To our knowledge,the possible role of TP53 gene in Maspin subcellular localization,in GC cells,has not yet been studied in a large number of human samples.AIM To evaluate the possible role of wild-type and mutated p53 in Maspin subcellular localization.METHODS The present study included 266 consecutive patients with GC in which TP53 gene status,and mutations in exons 2 to 11,respectively,were analyzed and correlated with immunohistochemical expression of p53 and Maspin.RESULTS None of the 266 cases showed mutations in exon 9.The rate of TP53 mutations was 33.83%.The mutation rate was slightly higher in distally-located GCs,with a lower degree(≤5 buds/high power fields)of dyscohesivity(P<0.01).The wildtype cases had a longer survival,compared with mutant GCs,especially in patients without lymph node metastases,despite the high depth of tumor infiltration(P=0.01).The Dukes-MAC-like staging system was proved to have the most significant independent prognostic value(P<0.01).The statistical correlations proved that TP53 gene mutations in exon 7 might induce knockdown of Maspin,but wild-type p53 can partially restore nuclear Maspin expression and decrease the metastatic potential of gastric adenocarcinoma cells.CONCLUSION Downregulated Maspin might be induced by mutations in exon 7 of the TP53 gene but wild-type p53 can partially restore nuclear Maspin expression.These findings should be proved in experimental studies.

关 键 词：p53 TP53 gene MASPIN Gastric cancer Carcinoma 

分 类 号：R735.2[医药卫生—肿瘤]