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Background

Nucleosome assembly protein 1-like 1 (NAP1L1) is highly expressed in various types of cancer and plays an important role in carcinogenesis, but its specific role in tumor development and progression remains largely unknown. In this study, we suggest the potential of NAP1L1 as a prognostic biomarker and therapeutic target for the treatment of ovarian cancer (OC).

Methods

In our study, a tissue microarray (TMA) slide containing specimens from 149 patients with OC and 11 normal ovarian tissues underwent immunohistochemistry (IHC) to analyze the correlation between NAP1L1 expression and clinicopathological features. Loss-of-function experiments were performed by transfecting siRNA and following lentiviral gene transduction into SKOV3 and OVCAR3 cells. Cell proliferation and the cell cycle were assessed by the Cell Counting Kit-8, EDU assay, flow cytometry, colony formation assay, and Western blot analysis. In addition, co-immunoprecipitation (Co-IP) and immunofluorescence assays were performed to confirm the relationship between NAP1L1 and its potential targets in SKOV3/OVCAR3 cells.

Results

High expression of NAP1L1 was closely related to poor clinical outcomes in OC patients. After knocking down NAP1L1 by siRNA or shRNA, both SKOV3 and OVCAR3 cells showed inhibition of cell proliferation, blocking of the G1/S phase, and increased apoptosis in vitro. Mechanism analysis indicated that NAP1L1 interacted with hepatoma-derived growth factor (HDGF) and they were co-localized in the cytoplasm. Furthermore, HDGF can interact with jun proto-oncogene (C-JUN), an oncogenic transformation factor that induces the expression of cyclin D1 (CCND1). Overexpressed HDGF in NAP1L1 knockdown OC cells not only increased the expression of C-JUN and CCND1, but it also reversed the suppressive effects of si-NAP1L1 on cell proliferation.

Conclusions

Our data demonstrated that NAP1L1 could act as a prognostic biomarker in OC and can interact with HDGF to mediate the proliferation of OC, and this process of triggered proliferation may contribute to the activation of HDGF/C-JUN signaling in OC cells."xsd:string
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http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/author"Chen Z."xsd:string
http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/author"Huang W."xsd:string
http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/author"Guo S."xsd:string
http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/author"Xie Y."xsd:string
http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/author"Xiaohua Zhu"xsd:string
http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/date"2022"xsd:gYear
http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/name"BMC Cancer"xsd:string
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http://purl.uniprot.org/citations/35351053http://purl.uniprot.org/core/title"NAP1L1 promotes tumor proliferation through HDGF/C-JUN signaling in ovarian cancer."xsd:string
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