Background
Circular RNA 0029803 (circ_0029803) was found to be upregulated in colorectal cancer (CRC) tissues, but its function and underlying molecular mechanism are not studied in CRC.
Methods
The expression levels of circ_0029803, microRNA-216b-5p (miR-216b-5p), and ski-oncogene-like (SKIL) were measured by quantitative real-time polymerase chain reaction (qRT-PCR). RNase R treatment was used to affirm the existence of circ_0029803. Cell proliferation, apoptosis, migration, and invasion were assessed by colony formation, flow cytometry, and Transwell assays, respectively. A glucose and lactate assay kit was used to detect glucose consumption and lactate production. Western blot was applied to analyze the levels of all proteins. Dual-luciferase reporter assay was performed to assess the relationship between miR-216b-5p and circ_0029803 or SKIL. Tumor xenograft models were established to elucidate the effect of circ_0029803 in vivo.
Results
Circ_0029803 expression was enhanced in CRC tissues and cells, and the 5-year overall survival rate of patients with high circ_0029803 expression was substantially reduced. Circ_0029803 depletion retarded proliferation, migration, invasion, EMT and glycolysis of CRC cells in vitro as well as the tumor growth in vivo. Mechanically, circ_0029803 could serve as miR-216b-5p sponge to regulate its expression, and miR-216b-5p knockdown reversed the inhibition of si-circ_0029803 on the malignant behaviors of CRC cells. Additionally, as the target mRNA of miR-216b-5p, SKIL could counteract the inhibitory effect of miR-216b-5p on the development of CRC cells. Importantly, silencing circ_0029803 reduced SKIL expression via sponging miR-216b-5p.
Conclusion
Circ_0029803 knockdown hindered proliferation, migration, invasion, EMT, and glycolysis and promoted apoptosis in CRC cells by modulating the miR-216b-5p/SKIL axis.
Surgery can be used to remove tumors from patients with colon cancer, but some patients have recurrence a short time after the tumor is surgically removed, and the disease-free survival (DFS) period is short. Therefore, if these high-risk patients can be identified as early as possible,
appropriate treatment strategies can be formulated to reduce their postoperative recurrence rate. Tumor immune scores have been proven to be effective in predicting the prognosis of patients, but the scoring can only be performed after the tumor has been removed from the patient. There is
still urgency to find indicators that can predict the prognosis of patients before surgery. We used electrochemiluminescence electrodes modified with nanomaterials to detect the expression of serum markers. After comparison, it was found that the contents of CEA, AFP, CA19-9, and CA125 in
patients with CRC were substantially higher than those with benign colonic disease. Pearson correlation analysis showed that CEA, AFP, CA19-9, and CA125 contents are positive correlated to the patient’s tumor immune score. Further investigation found that patients with high expression
of CEA, AFP, CA19-9, and CA125 had a three-year DFS rate, which was substantially lower than those with low expression. Therefore, our findings suggest that the use of the composite nano-modified electrode electrochemiluminescence method to detect the content of CEA, AFP, CA19-9, and CA125
in patients with colorectal cancer can predict DFS after surgery to a certain extent. Additionally, the perioperative data plan can be adjusted in time according to the expression of tumor markers before surgery.
Heat shock protein 27 (Hsp27), a member of the heat shock protein (Hsp) family, is critical in the stress response. However, the role of Hsp27 in the pathogenesis of preeclampsia remains unknown. The aim of the present study was to examine effect of downregulation of Hsp27 in proliferation, migration, and invasion in human JAR cells. Materials and Methods: To determine their effect, siRNA interference was used to knock down Hsp27 expression in JAR lines. The effects of transfected cells were screened for HSP27 expression by Western blotting analysis. Cell proliferation determined by CCK-8 assay and cell clonogenic assay. Wound healing assay measured the migration ability. Transwell assay measured migration and invasion ability. Results: Downregulation of Hsp27 inhibits proliferation, migration, and invasion in human choriocarcinoma cell line JAR. Conclusion: The present data suggested that Hsp27 may play an important role in preeclampsia.
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