Yong Wang1, Zhuoqi Xuan1, Baocheng Wang1, Dongsheng Zhang1, Chuan Zhang1, Jiandong Wang2, Yueming Sun3. 1. Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China. 2. Department of Pathology, Jinling Hospital, Nanjing University School of Medicine, No. 305, Zhong Shan Dong Lu, Nanjing, 210002, China. jd_wang@outlook.com. 3. Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China. jssym@vip.sina.com.
Abstract
BACKGROUND: EphA3 is a member of Eph receptors, which is involved in tumorigenesis. The expression and clinical significance of EphA3 in colorectal cancer (CRC) have not been fully investigated. METHODS: Four colon cancer cell lines and a set of CRC tissues were examined for EphA3 expression. The methylation status of a CpG island within the EphA3 promoter, the presence of four somatic EPHA3 mutations, and EPHA3 gene copy number variations were also analyzed in colon cancer cell lines. RESULTS: EphA3 expression was lost in all colon cancer cell lines examined. EphA3 expression was lower in tumor tissues when compared with normal intestinal tissues (P < 0.001). A comparison of EphA3 immunohistochemical scores for tumor and matched normal intestinal tissues revealed that the protein was downregulated in 82/164 (50.0%), unchanged in 52/164 (31.7%), and upregulated in 30/164 (18.3%) cases of CRC. EphA3 expression was negatively associated with lymph node metastasis (P =0.014, rs=- 0.192) and TNM stage (P =0.001, rs=- 0.260). Downregulation of expression was more common in older patients (P =0.013, rs=0.193). Methylated promoter DNA was detected in all four colon cancer cell lines. Somatic mutations or EphA3 gene deletion was not detected. CONCLUSIONS: EphA3 was downregulated in the majority of CRC. Hypermethylation of a CpG island within the EPHA3 promoter provides a possible mechanism. Loss of EphA3 expression was associated with lymph node metastasis and TNM stage and may therefore prove useful as a predictor for tumor spread in CRC.
BACKGROUND:EphA3 is a member of Eph receptors, which is involved in tumorigenesis. The expression and clinical significance of EphA3 in colorectal cancer (CRC) have not been fully investigated. METHODS: Four colon cancer cell lines and a set of CRC tissues were examined for EphA3 expression. The methylation status of a CpG island within the EphA3 promoter, the presence of four somatic EPHA3 mutations, and EPHA3 gene copy number variations were also analyzed in colon cancer cell lines. RESULTS:EphA3 expression was lost in all colon cancer cell lines examined. EphA3 expression was lower in tumor tissues when compared with normal intestinal tissues (P < 0.001). A comparison of EphA3 immunohistochemical scores for tumor and matched normal intestinal tissues revealed that the protein was downregulated in 82/164 (50.0%), unchanged in 52/164 (31.7%), and upregulated in 30/164 (18.3%) cases of CRC. EphA3 expression was negatively associated with lymph node metastasis (P =0.014, rs=- 0.192) and TNM stage (P =0.001, rs=- 0.260). Downregulation of expression was more common in older patients (P =0.013, rs=0.193). Methylated promoter DNA was detected in all four colon cancer cell lines. Somatic mutations or EphA3 gene deletion was not detected. CONCLUSIONS:EphA3 was downregulated in the majority of CRC. Hypermethylation of a CpG island within the EPHA3 promoter provides a possible mechanism. Loss of EphA3 expression was associated with lymph node metastasis and TNM stage and may therefore prove useful as a predictor for tumor spread in CRC.
Authors: Eduard Batlle; Julinor Bacani; Harry Begthel; Suzanne Jonkheer; Suzanne Jonkeer; Alexander Gregorieff; Maaike van de Born; Núria Malats; Elena Sancho; Elles Boon; Tony Pawson; Steven Gallinger; Steven Pals; Hans Clevers Journal: Nature Date: 2005-06-23 Impact factor: 49.962
Authors: A W Boyd; L D Ward; I P Wicks; R J Simpson; E Salvaris; A Wilks; K Welch; M Loudovaris; S Rockman; I Busmanis Journal: J Biol Chem Date: 1992-02-15 Impact factor: 5.157
Authors: Elena Andretta; Fernando Cartón-García; Águeda Martínez-Barriocanal; Priscila Guimarães de Marcondes; Lizbeth M Jimenez-Flores; Irati Macaya; Sarah Bazzocco; Josipa Bilic; Paulo Rodrigues; Rocio Nieto; Stefania Landolfi; Santiago Ramon Y Cajal; Simo Schwartz; Arthur Brown; Higinio Dopeso; Diego Arango Journal: Sci Rep Date: 2017-02-07 Impact factor: 4.379