BTNL9 is frequently downregulated and inhibits proliferation and metastasis via the P53/CDC25C and P53/GADD45 pathways in breast cancer.
Breast cancer (BC) threatens the life and health of women worldwide because of its high morbidity and mortality. The present study aimed to explore the biological functions and potential mechanism of BTNL9 in BC. RNA sequence and clinical data extracted from the Kaplan-Meier plotter database and The Cancer Genome Atlas (TCGA) were utilized to analyze the relationship between the expression level of BTNL9 in BC tissues and clinicopathological features and the effects of BTNL9 expression on the prognosis of BC. The diagnostic efficacy of BTNL9 expression was estimated by receiver operating characteristic (ROC) curve analysis. The mRNA and protein expression levels of BTNL9 in BC cell lines and in BC tissue were determined by quantitative real-time PCR (qPCR) and western blotting, respectively. The functions of BTNL9 were measured by colony formation, CCK-8, Transwell, flow cytometry and EdU assays. Western blotting analysis was also performed to explore the latent mechanism of BTNL9. The results showed that the expression of BTNL9 declined in BC tissues and cell lines. Low expression of BTNL9 was significantly associated with early progression of T stage, relapse-free survival (RFS), and poor overall survival (OS). Ectopic expression of BTNL9 inhibited cell proliferation, colony formation and metastasis and induced apoptosis in BC, while knockdown of BTNL9 had the opposite result. Furthermore, BTNL9 blocked BC cells in the G2/M phase via the P53/CDC25C and P53/GADD45 pathways. Our results suggest that BTNL9 may play a tumor-suppressive role in BC and has the potency to become a new biomarker for early BC diagnosis.
['Mo|Qingfan|Q|', 'Xu|Ke|K|', 'Luo|Chenghao|C|', 'Zhang|Qia|Q|', 'Wang|Long|L|', 'Ren|Guosheng|G|']
D017209:Apoptosis D001943:Breast Neoplasms D000071797:Butyrophilins D018797:Cell Cycle Proteins D045744:Cell Line, Tumor D002465:Cell Movement D049109:Cell Proliferation D015536:Down-Regulation D059565:G2 Phase Cell Cycle Checkpoints D006801:Humans D059566:M Phase Cell Cycle Checkpoints D009361:Neoplasm Invasiveness D009362:Neoplasm Metastasis D011379:Prognosis D013601:T-Lymphocytes D016159:Tumor Suppressor Protein p53 D025521:Tumor Suppressor Proteins D020687:cdc25 Phosphatases
BTNL9 Breast cancer Tumor suppressor gene