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Neuropilin 1 (NRP1) is a novel tumor marker in hepatocellular carcinoma.
BACKGROUND: TEA domain transcription factor (TEAD) has an oncogenic role in hepatocellular carcinoma (HCC). However, whether a membrane protein can serve not only as a tumor marker that reflects TEAD function but also as a therapeutic target that stimulates tumorigenesis in HCC remains unknown.
METHODS: Tissue NRP1 was measured using immunohistochemistry. Cell viability, colony formation and caspase3/7 activity were assessed using MTT, soft agar and caspase 3/7 Glo assays, respectively. Serum NRP1 was examined using ELISA and Western blotting.
RESULTS: NRP1 expression was up-regulated by TEAD. We also identified a conserved TEAD-binding motif in the NRP1 promoters, which was essential for the TEAD-NRP1 interaction. NRP1 was upregulated in HCC tissues and cell lines, and knockdown of NRP1 inhibited the transformative phenotypes of HCC cells. Notably, the concentrations of serum NRP1 in the HCC patients were much higher than those of hepatitis B, hepatitis C, cirrhosis, breast cancer, colon cancer, gastric cancer and lung cancer patients. Moreover, serum NRP1 was significantly associated with AFP, γ-GT, Alb, bile acid, ALT, AST, ALP and pre-Alb. The area under the receiver operating characteristic curve (AUC-ROC) for serum NRP1 was 0.971, presenting better diagnostic performance compared to AFP.
CONCLUSIONS: NRP1 is a novel tumor marker in HCC.
METHODS: Tissue NRP1 was measured using immunohistochemistry. Cell viability, colony formation and caspase3/7 activity were assessed using MTT, soft agar and caspase 3/7 Glo assays, respectively. Serum NRP1 was examined using ELISA and Western blotting.
RESULTS: NRP1 expression was up-regulated by TEAD. We also identified a conserved TEAD-binding motif in the NRP1 promoters, which was essential for the TEAD-NRP1 interaction. NRP1 was upregulated in HCC tissues and cell lines, and knockdown of NRP1 inhibited the transformative phenotypes of HCC cells. Notably, the concentrations of serum NRP1 in the HCC patients were much higher than those of hepatitis B, hepatitis C, cirrhosis, breast cancer, colon cancer, gastric cancer and lung cancer patients. Moreover, serum NRP1 was significantly associated with AFP, γ-GT, Alb, bile acid, ALT, AST, ALP and pre-Alb. The area under the receiver operating characteristic curve (AUC-ROC) for serum NRP1 was 0.971, presenting better diagnostic performance compared to AFP.
CONCLUSIONS: NRP1 is a novel tumor marker in HCC.
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