Role of HPV E7/miR-143-3p/SH2D3A pathway in regulating the occurrence and development of cervical cancer.

Objective: This study aims to explore the role of SH2D3A in cervical cancer, as well as its potential interaction with human papillomavirus (HPV) E7 and microRNA (miRNA).

Methods: Quantitative reverse transcription polymerase chain reaction (qRT-PCR) and immunohistochemistry were used to compare the expressions of SH2D3A in tissues. To assess the effects of SH2D3A on cervical cancer cell phenotypes, SH2D3A was knocked down in SiHa and HeLa cells, followed by cell proliferation (Cell Counting Kit-8 assay), apoptosis (flow cytometry), and invasion (Transwell assay) analyses. A transplantation tumor model was established to compare the tumorigenic ability of cervical cancer cells before and after SH2D3A silencing. Bioinformatics analysis predicted and dual-luciferase reporter assays verified the sponge adsorption effect of SH2D3A on miRNA. Western blot and qRT-PCR analyses were conducted to examine the impact on target genes following the downregulation of HPV E7 and SH2D3A.

Results: SH2D3A expression was significantly elevated in cervical cancer tissues. SH2D3A silencing inhibited cell proliferation and invasion, induced apoptosis, and reduced tumorigenesis in nude mice. Bioinformatics tools identified a binding relationship between SH2D3A and miR-143-3p, confirmed by the luciferase reporter assays. Western blot analysis revealed that SH2D3A knockdown led to decreased levels of Janus kinase 1 (JAK1) and signal transducer and activator of transcription 3 (STAT3) proteins. Additionally, qRT-PCR showed that SH2D3A mRNA levels decreased after HPV E7 silencing, whereas miR-143-3p levels significantly increased.

Conclusion: HPV E7 influences SH2D3A expression through miR-143-3p, thereby regulating the JAK1/STAT3 pathway. This mechanism promotes the occurrence and development of cervical cancer.