Genetic and epigenetic alterations of netrin-1 receptors in gastric cancer with chromosomal instability

被引:11
|
作者
Toda, Keisuke [1 ]
Nagasaka, Takeshi [1 ]
Umeda, Yuzo [1 ]
Tanaka, Takehiro [2 ]
Kawai, Takashi [1 ]
Fuji, Tomokazu [1 ]
Taniguchi, Fumitaka [1 ]
Yasui, Kazuya [1 ]
Kubota, Nobuhito [1 ]
Takehara, Yuko [1 ]
Tazawa, Hiroshi [1 ]
Kagawa, Shunsuke [1 ]
Sun, Dong-Sheng [1 ,3 ]
Nishida, Naoshi [4 ]
Goel, Ajay [5 ,6 ]
Fujiwara, Toshiyoshi [1 ]
机构
[1] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Surg Gastroenterol, Okayama, Okayama 7008558, Japan
[2] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Pathol, Okayama, Okayama 7008558, Japan
[3] Kailuan Gen Hosp Tangshan Hebei Prov, Dept Oncol, Tangshan 063000, Hebei, Peoples R China
[4] Kinki Univ, Fac Med, Dept Gastroenterol & Hepatol, Osaka 5898511, Japan
[5] Baylor Univ, Med Ctr, Ctr Gastrointestinal Canc Res, Ctr Epigenet,Canc Prevent & Canc Gen,Baylor Res I, Dallas, TX 75246 USA
[6] Baylor Univ, Charles A Sammons Canc Ctr, Dallas, TX 75246 USA
关键词
Gastric cancer; Methylation; Chromosomal instability; DCC; UNC5C; Netrin-1; receptors; HELICOBACTER-PYLORI INFECTION; DIFFERENTIATED ADENOCARCINOMA; MICROSATELLITE INSTABILITY; TUMOR PROGRESSION; COLON-CANCER; DCC; HETEROZYGOSITY; IDENTIFICATION; METHYLATION; MUTATIONS;
D O I
10.1186/s13148-015-0096-y
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Background: The gene expressions of netrin-1 dependence receptors, DCC and UNC5C, are frequently downregulated in many cancers. We hypothesized that downregulation of DCC and UNC5C has an important growth regulatory function in gastric tumorigenesis. Results: In the present study, a series of genetic and epigenetic analyses for DCC and UNC5C were performed in a Japanese cohort of 98 sporadic gastric cancers and corresponding normal gastric mucosa specimens. Loss of heterozygosity (LOH) analyses and microsatellite instability (MSI) analysis was applied to determine chromosomal instability (CIN) and MSI phenotypes, respectively. More than 5 % methylation in the DCC and UNC5C promoters were found in 45 % (44/98) and 32 % (31/98) gastric cancers, respectively, and in 9 % (9/105) and 5 % (5/105) normal gastric mucosa, respectively. Overall, 70 % (58 of 83 informative cases) and 51 % (40 of 79 informative cases) of gastric cancers harbored either LOH or aberrant methylation in the DCC and UNC5C genes, respectively. In total, 77 % (51 of 66 informative cases) of gastric cancers showed cumulative defects in these two dependence receptors and were significantly associated with chromosomal instability. Both DCC and UNC5C were inactivated in 97 % of CIN-positive gastric cancers and in 55 % of CIN-negative gastric cancers. Conclusions: Defect in netrin receptors is a common feature in gastric cancers. DCC alterations are apparent in the early stages, and UNC5C alterations escalate with the progression of the disease, suggesting that the cumulative alterations of netrin-1 receptors was a late event in gastric cancer progression and emphasizing the importance of this growth regulatory pathway in gastric carcinogenesis.
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页数:18
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