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http://dx.doi.org/10.5713/ajas.20.0325

ssc-miR-185 targets cell division cycle 42 and promotes the proliferation of intestinal porcine epithelial cell  

Wang, Wei (College of Animal Science and Technology, Gansu Agricultural University)
Wang, Pengfei (College of Animal Science and Technology, Gansu Agricultural University)
Xie, Kaihui (College of Animal Science and Technology, Gansu Agricultural University)
Luo, Ruirui (College of Animal Science and Technology, Gansu Agricultural University)
Gao, Xiaoli (College of Animal Science and Technology, Gansu Agricultural University)
Yan, Zunqiang (College of Animal Science and Technology, Gansu Agricultural University)
Huang, Xiaoyu (College of Animal Science and Technology, Gansu Agricultural University)
Yang, Qiaoli (College of Animal Science and Technology, Gansu Agricultural University)
Gun, Shuangbao (College of Animal Science and Technology, Gansu Agricultural University)
Publication Information
Animal Bioscience / v.34, no.5, 2021 , pp. 801-810 More about this Journal
Abstract
Objective: microRNAs (miRNAs) can play a role in a variety of physiological and pathological processes, and their role is achieved by regulating the expression of target genes. Our previous high-throughput sequencing found that ssc-miR-185 plays an important regulatory role in piglet diarrhea, but its specific target genes and functions in intestinal porcine epithelial cell (IPEC-J2) are still unclear. We intended to verify the target relationship between porcine miR-185 and cell division cycle 42 (CDC42) gene in IPEC-J2 and to explore the effect of miR-185 on the proliferation of IPEC-J2 cells. Methods: The TargetScan, miRDB, and miRanda software were used to predict the target genes of porcine miR-185, and CDC42 was selected as a candidate target gene. The CDC42-3' UTR-wild type (WT) and CDC42-3'UTR-mutant type (MUT) segments were successfully cloned into pmirGLO luciferase vector, and the luciferase activity was detected after co-transfection with miR-185 mimics and pmirGLO-CDC42-3'UTR. The expression level of CDC42 was analyzed using quantitative polymerase chain reaction and Western blot. The proliferation of IPEC-J2 was detected using cell counting kit-8 (CCK-8), methylthiazolyldiphenyl-tetrazolium bromide (MTT), and 5-ethynyl-2'-deoxyuridine (EdU) assays. Results: Double enzyme digestion and sequencing confirmed that CDC42-3'UTR-WT and CDC42-3'UTR-MUT were successfully cloned into pmirGLO luciferase reporter vector, and the luciferase activity was significantly reduced after co-transfection with miR-185 mimics and CDC42-3'UTR-WT. Further we found that the mRNA and protein expression level of CDC42 were down-regulated after transfection with miR-185 mimics, while the opposite trend was observed after transfection with miR-185 inhibitor (p<0.01). In addition, the CCK-8, MTT, and EdU results demonstrated that miR-185 promotes IPEC-J2 cells proliferation by targeting CDC42. Conclusion: These findings indicate that porcine miR-185 can directly target CDC42 and promote the proliferation of IPEC-J2 cells. However, the detailed regulatory mechanism of miR-185/CDC42 axis in piglets' resistance to diarrhea is yet to be elucidated in further investigation.
Keywords
ssc-miR-185; Cell Division Cycle 42 (CDC42); Target Relationship; Proliferation; Intestinal Porcine Epithelial Cell (IPEC-J2);
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