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This study aims to illustrate the role of circPDSS1 and the Wnt/β-catenin signaling in the development of colorectal cancer (CRC). Patients and Methods: Cancerous mucosa and normal paracancerous mucosa tissues more than 5 cm away from the tumor were surgically collected from 56 CRC patients. circPDSS1 levels in collected tissues and CRC cell lines were detected by quantitative real-time polymerase chain reaction (qRT-PCR). The influence of circPDSS1 on clinical features of CRC patients was analyzed. After knockdown of circPDSS1 in HCT-8 and HCT-116 cells, phenotype changes were examined by Transwell, tube formation and wound healing assay. Western blot and rescue experiments were finally performed to uncover the role of circPDSS1 and the Wnt/β-catenin signaling in the development of CRC. Results: circPDSS1 was upregulated in CRC mucosa tissues than controls. High level of circPDSS1 predicted high rates of lymphatic metastasis and distant metastasis, and poor prognosis in CRC patients. Knockdown of circPDSS1 attenuated migratory ability and angiogenesis in CRC cells. Protein levels of key genes in the Wnt/β-catenin signaling, including β-catenin, GSK-3β, c-Myc, MMP-9 and cyclin D1 were downregulated in CRC cells transfected with sh-circPDSS1. Overexpression of β-catenin reversed the role of circPDSS1 in attenuating migratory ability and angiogenesis in CRC cells. Conclusion: Upregulated circPDSS1 in CRC is closely linked to lymphatic metastasis, distant metastasis and overall survival. It stimulates the migratory ability and angiogenesis in CRC cells via activating the Wnt/β-catenin signaling.

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Hepatocellular carcinoma (HCC) is the second leading cause of cancer-related death worldwide. Immunotherapy has been widely reported to have sustained and strong antitumor effects in a variety of tumors with active immune microenvironments, including HCC. PPP1R14B not only involves in the initiation of cancers, but also affects tumor progression and prognosis. However, the roles of PPP1R14B and the associations with immune microenvironment in HCC have not been investigated. RNA-seq and clinical data of HCC was acquired from TCGA database. We mainly focused on the roles of PPP1R14B and the associations with the immune microenvironment in HCC. The results showed that PPP1R14B was significantly increased in HCC samples compared with the control group, and its high expression was significantly correlated with survival outcome, immune status, and response to immunotherapy. We also observed a significant correlation between PPP1R14B expression and chemotherapy drug sensitivity. In addition, we established an immune prognostic model associated with ppp1r14b, which has high predictive power for the prognosis of HCC patients. This study contributes to stratify HCC patients into sub-populations to develop personalized treatment strategy.

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