Objective: GRWD1 (glutamate-rich WD40 repeat containing 1) is a multifunctional protein involved in multiple cellular regulatory pathways, particularly those associated with cell growth control. GRWD1 is represented as a potential oncogene in several cancers, however, the function and mechanism of GRWD1 in the development of colon cancer are still unknown.
Materials and Methods: IHC was used to detect the expression of GRWD1 in colon carcinoma tissues. CCK-8, colony formation, and EdU were used to measure the cell proliferation after GRWD1 knockdown and overexpression. The distribution of the cell cycle was analyzed by flow cytometry. The effect of GRWD1 knockdown on migration and invasion was analyzed by wound healing and transwell assays.
Results: Overexpression of GRWD1 in colon carcinoma tissues was associated with pathological grading, tumor size, N stage, TNM stage, and poor survival. GRWD1 had high sensitivity and specificity in distinguishing colon cancer from noncancerous tissues, and might be served as an independent prognosis in colon carcinoma patients. Knockdown of GRWD1 significantly inhibited the cell proliferation and colony formation, and induced cell cycle arrest and more drug susceptibility, and suppressed the migration and invasion. GRWD1 exhibited these oncogenic activities might be associated with its regulation on the expression of PCNA and Ki67, Cyclin A2 and Cyclin B1, ABCC1 and GSTP1, MTA1 and MTA2.
Conclusion: GRWD1 may play an oncogenic activity in the development of colon carcinoma and its overexpression was associated with malignant characteristics and poor survival outcome of colon carcinoma. GRWD1 might be a potential target for future therapy.
Keywords: proliferation, cell cycle, drug susceptibility, migration and invasion, GRWD1, colon carcinoma