NDRG4, a novel candidate tumor suppressor, is a predictor of overall survival of colorectal cancer patients.
The role of NDRG4 in human malignancies is largely unknown. We investigated the role of NDRG4 protein in colorectal cancer and its prognostic value in a hospital-based retrospective training cohort of 272 patients and a prospective validation cohort of 708 patients were. Cell line was transfected with an NDRG4 expression construct to confirm the suppression of PI3K-AKT activity by NDRG4. Appropriate statistical methods were utilized for analysis. Results showed that NDRG4 protein expression was significantly decreased from normal mucosa, chronic colitis, ulcerative colitis, atypical hyperplasia to colorectal cancer. Significant negative correlations were found between NDRG4 staining and p-AKT. Patients with positive NDRG4 staining had favorable survival in both study cohorts. In multivariate analysis, NDRG4 staining proved to be an independent predictor of overall survival. Moreover, the prognostic role of NDRG4 was stratified by p-AKT. Overexpression of NDRG4 in colorectal cancer cell can significantly suppress PI3K-AKT activity, even after EGF stimulation. These results indicated NDRG4 protein expression was decreased in colorectal cancer. It may play its tumor suppressive role in carcinogenesis and progression through attenuation of PI3K-AKT activity. Therefore, high risk colorectal cancer patients could be better identified based on the combination of NDRG4 and PI3K-AKT activity.
State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China.|State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi'an, China.
Dake
D
Chu
Department of Plastic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
Zixi
Z
Zhang
Department of Gastrointestinal Surgery, Tianjin Union Medical Center, Tianjin, China.
Yi
Y
Zhou
Statistics Office, Chengdu Military General Hospital, Chengdu, Sichuan Province, China.
Yunming
Y
Li
Department of Pathology, Fourth Military Medical University, Xi'an, China.
Shaojun
S
Zhu
State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi'an, China.
Jian
J
Zhang
State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
Qingchuan
Q
Zhao
State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
Gang
G
Ji
State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
Weizhong
W
Wang
State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
Jianyong
J
Zheng
D049109:Cell Proliferation; D015179:Colorectal Neoplasms / Q000401:mortality / Q000473:pathology; D018450:Disease Progression; D005260:Female; D016147:Genes, Tumor Suppressor / Q000502:physiology*; D006801:Humans; D008297:Male; D009124:Muscle Proteins / Q000235:genetics* / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D011379:Prognosis; D014162:Transfection
D009124:Muscle Proteins; C431705:NDRG4 protein, human; D009419:Nerve Tissue Proteins; D019869:Phosphatidylinositol 3-Kinases
NDRG4; PI3K-AKT; carcinogenesis; colorectal cancer; progression