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Interference of EFNA4 suppresses cell proliferation, invasion and angiogenesis in hepatocellular carcinoma by downregulating PYGO2.
Cancer Biology & Therapy 2022 December 32
Hepatocellular carcinoma (HCC) is the most common type of liver cancer. Ephrin A4 (EFNA4) acts as an oncogene in multiple cancers but is little known in HCC. It is revealed that EFNA4 is highly expressed in patients with HCC and influences the proliferation of HCC cells; however, detailed regulatory mechanism of EFNA4 in HCC needs to be unveiled. Here, we discovered that EFNA4 was highly expressed in HCC cell lines. EFNA4 knockdown greatly suppressed cell proliferation, migration and invasion, as well as inhibiting angiogenesis in Huh7 cells. EFNA4 was demonstrated to interact with pygopus-2 (PYGO2) and positively regulate PYGO2 expression. Gene gain- and loss-of-function experiments revealed that the anti-tumor effect of EFNA4 knockdown was partly abolished by PYGO2 overexpression. Furthermore, EFNA4 knockdown blocked wnt/β-catenin signaling in Huh7 cells, which was then abolished by PYGO2. In conclusion, this study further ensured the oncogenic role of EFNA4 in HCC, and disclosed that EFNA4 knockdown suppressed cell proliferation, invasion, angiogenesis, and wnt/β-catenin signaling in HCC by downregulating PYGO2.
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