Zinc Finger Protein 263 Augments Autophagy and Promotes Intrahepatic Cholangiocarcinoma Proliferation.

Abstract

Intrahepatic cholangiocarcinoma (ICC) is an aggressive cancer characterized by a poor prognosis. Despite Zinc finger proteins (ZNFs) importance in tumor development and progression, it is unknown how dysregulated ZNF263 contributes to intrahepatic cholangiocarcinoma. This study aimed to determine whether ZNF263 plays an oncogenic role in ICC progression. The microarray of tumor tissues from clinical intrahepatic cholangiocarcinoma was immunohistochemically analyzed for ZNF263. Based on plate colony formation, CCK8, and tumor xenograft models, ZNF263 was assessed for its biological function. Mechanistically, CUT&Tag, RNA-seq, CHIP-PCR, Dual luciferase reporter assay, Western blotting, transmission electron microscopy (TEM), and immunohistochemical staining were employed. ZNF263 expression was elevated in intrahepatic cholangiocarcinoma tissues compared to nontumor tissues, which negatively impacted patient outcomes. Notably, ZNF263 overexpression promoted ICC cells proliferation via enhancing autophagy, whereas ZNF263 knockdown inhibited ICC cells proliferation. Furthermore, ZNF263 binds to the enhancer region of ULK1 and mediates its expression. ULK1 over-expressing ameliorated ZNF263 knockdown-induced inhibition of CRC proliferation. By activating the ULK1-autophagy axis, ZNF263 promotes proliferation of ICC and is potentially a prognostic or therapeutic target of ICC.