Yanping Jin

This study aimed to determine the molecular mechanisms underlying immune escape in ovarian cancer. Samples of ovarian cancer were used to explore the regulatory pathways involved in the malignant phenotype. Tumor cell models with different levels of factor expression were constructed via transfection, and their regulation was determined through investigation of protein expressions. Moreover, our study aimed to investigate the effects of M2 polarization and TAMs aggregation on the apoptosis of CD8 + T-cells, and determine their regulatory axis. Results revealed ZEB1 may promote CCL18 expression via upregulation of MCSF concentration. Notably, high CCL18 expression levels were associated with the aggregation of M2-TAMs and the apoptosis of CD8 + T-cells. In addition, results of the present study demonstrated that the proliferation and invasion of ovarian cancer cells with high expression levels of proteins associated with ZEB1 signal pathway were increased. At the same time the growth rate of tumors in mice was reduced following ZEB1 knockdown, and the volume/weight of tumors were markedly decreased both in vitro and in vivo. Moreover, our results revealed that the aggregation of M2-TAMs and the apoptosis of CD8 + T-cells were significantly decreased in tumor cells following ZEB1 knockdown. Thus, these results verified that ZEB1 may promote the M2 polarization of TAMs via the MCSF axis, leading to the increased secretion of CCL18. Moreover, the MCSF axis may mediate immune escape through the induction of CD8 + T-cell apoptosis, ultimately promoting the malignant phenotype in ovarian cancer cells.

Objective: We aimed to construct the ferritin autophagy regulatory network and illustrate its mechanism in ferroptosis, TME immunity and malignant phenotypes of ovarian cancer. Methods: First, we used Western blot assays and immunohistochemistry to detect the pathway expression in ovarian cancer samples (C-MYC, NCOA4). Then, we performed RIP and FISH analysis to verify the targeted binding of these factors after which we constructed ovarian cancer cell models and detected pathway regulator expression (NCOA4). Co-localization and Western blot assays were used to detect ferritin autophagy in different experimental groups. We selected corresponding kits to assess ROS contents in ovarian cancer cells. MMP was measured using flow cytometry and mitochondrial morphology was observed through TEM. Then, we chose Clone, EdU and Transwell to evaluate the proliferation and invasion abilities of ovarian cancer cells. We used Western blot assays to measure the DAMP content in ovarian cancer cell supernatants. Finally, we constructed tumor bearing models to study the effect of the C-MYC pathway on ovarian cancer tumorigenesis and TME immune infiltration in in vivo conditions. Results: Through pathway expression detection, we confirmed that C-MYC was obviously up-regulated and NCOA4 was obviously down-regulated in ovarian cancer samples, while their expression levels were closely related to the malignancy degree of ovarian cancer. RIP, FISH and cell model detection revealed that C-MYC could down-regulate NCOA4 expression through directly targeted binding with its mRNA. Ferritin autophagy and ferroptosis detection showed that C-MYC could inhibit ferroptosis through NCOA4-mediated ferritin autophagy, thus reducing ROS and inhibiting mitophagy in ovarian cancer cells. Cell function tests showed that C-MYC could promote the proliferation and invasion of ovarian cancer cells through the NCOA4 axis. The Western blot assay revealed that C-MYC could reduce HMGB1 release in ovarian cancer cells through the NCOA4 axis. In vivo experiments showed that C-MYC could promote tumorigenesis and immune evasion in ovarian cancer cells through inhibiting HMGB1 release induced by NCOA4-mediated ferroptosis. Conclusion: According to these results, we concluded that C-MYC could down-regulate NCOA4 expression through directly targeted binding, thus inhibiting ferroptosis and promoting malignant phenotype/immune evasion in ovarian cancer cells through inhibiting ferritin autophagy.

Background: TMZ resistance plays a critical role in the treatment of glioma, our research try to explore how circRNAs affect the chemosensitivity of glioma cells. Methods: In this study, we proceeded gene sequencing, and selected circRNAs specifically expressed in TMZ resistant cells and use them as target genes for subsequent studies; by knocking out the target gene we clarify its effect on TMZ resistant glioma proliferation, invasion, migration and cell apoptosis; through tumor-burdened animals we explore the effect of target gene in vivo environment. Results: In our research we revealed that circ-GLIS3 was significantly upregulated in TMZ resistant glioma cells. Functionally, knocking down circ-GLIS3 could inhibit proliferation, invasion, and migration abilities of TMZ resistant glioma cells; moreover, the downregulation of circ-GLIS3 could induce cell cycle arrest and apoptosis, while miR-548m inhibition and MED31 mRNA could reverse this progress. In vivo condition, the silencing of circ-GLIS3 could induce cell apoptosis and suppressed tumor growth. Mechanistically, circ-GLIS3 positively upregulated MED31 expression by sponging miR-548m. Conclusions: All these research findings demonstrate that circ-GLIS3 accelerates TMZ resistant glioma progression through miR-548m/MED31 axis.