RESUMO
Circular RNA (circRNA), as a competitive endogenous RNA (ceRNA), plays an importantrole in the regulation of cell differentiation. The purpose of this study was to identify and analyze porcinecircular RNA insulin-like growth factor 1 receptor (circIGF1R), explore its expression patterns, construct a ceRNA regulatory network related to circIGF1R, and explore the regulation of its ectopicexpression on adipogenic differentiation of mouse mesenchymal stem cells (C3H10T1 / 2) effect. Forwardand reverse PCR, Sanger sequencing, RNase R enzyme digestion tests, and qRT-PCR were used toverify that circIGF1R is a circRNA formed by the second exon of insulin-like growth factor 1 receptor(IGF1R). It was expressed in all tissues of pigs, and its expression level increased with age in adiposetissues. miRDB, TargetScan and miRWalk online software were used to predict circIGF1R target genes. RNAhybrid software was used for binding site prediction. DAVID bioinformatics functional analysissoftware was used to perform GO and KEGG enrichment analysis on candidate target genes. Cytoscapesoftware was used to construct the ceRNA network diagram. Based on the gene expression correlation andpredicted target relationship, the GO and KEGG enrichment analysis was drawn and the ceRNA networkwas constructed; the dual luciferase reporter gene test was used, and we found that circIGF1R andFABP4 can bind to ssc (Sus scrofa chromosome) -miR-133a-5p. The circIGF1R overexpression vectorwas successfully constructed and expressed in C3H10T1/ 2 cells. It was found that after overexpression ofcircIGF1R, the expression of key adipogenic regulatory factors CEBPa, CEBPß, FABP4 and PPAR? increased significantly(P<0. 01), and the number of lipid droplets increased significantly. The results ofthis study show that circIGF1R exists in pig adipose tissues, and may positively regulate the adipogenicdifferentiation of C3H10T1/ 2 cells through the ceRNA mechanism, which lays a theoretical foundation forfurther research on circIGF1R regulating the adipogenic differentiation of pig precursor intramuscularadipocytes.
RESUMO
ILF3 antisense RNA 1 (ILF3-AS1), the antisense RNA of interleukin enhancer binding factor 3 (ILF3), is a lncRNA located on chromosome 19p13. 2. ILF3-AS1 played a key role in the occurrence and development of a variety of tumors, but its role in cervical cancer had not been explored yet. Therefore, we first used TCGA and GTEx database to conduct bioinformatics analysis. The results suggested that ILF3-AS1 was down-regulated in cervical cancer tissues (P < 0. 001) and was associated with a good prognosis (P = 0. 045). The qRT-PCR experiment showed that expression of ILF3-AS1 in cervical cancer tissues and SiHa, HeLa, CaSki cervical cancer cell lines was lower than that in control groups. Subsequently, overexpressing of ILF3-AS1 can significantly inhibit the cancer cell viability and stimulate apoptosis (P<0. 001). Analysis using the Star Base v3. 0 database suggested that ILF3-AS1 can target miR-130a-3p; while miR-130a-3p may target PTEN. The qRT-PCR test showed that the expression of miR-130a-3p in cervical cancer was significantly higher than that in normal cervical tissues (P < 0. 01). The results of the luciferase reporter assay showed that ILF3-AS1 can specifically bind to miR-130a-3p (P<0. 01). After overexpression of ILF3-AS1 in HeLa cells, the expression of miR-130a-3p was significantly down-regulated (P < 0. 01). Co-transfection with pcDNA3. 1-ILF3-AS1 and miR-130a-3p mimics, the inhibitory effect of LF3-AS1 on cell proliferation can partially be reversed (P<0. 001). After HeLa cells overexpressed ILF3-AS1, the expression of phosphatase and tensin homolog deleted on chromosome ten (PTEN) mRNA (P < 0. 001) and proteins (P < 0. 001) significantly increased; when miR-130a-3p mimics was simultaneously used in HeLa cell, the increased expression of PTEN mRNA (P <0. 001) and proteins (P < 0. 001) was notably inhibited. In summary, ILF3-AS1 inhibited the proliferation of cervical cancer cells by sponging miR-130a-3p to regulate the expression of PTEN.