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Circular non-coding LRP6 is a tissue-enriched circular RNA which regulates smooth muscle cell biology acting as a sponge for miR-145

ABSTRACT: Rationale: microRNAs (miRNAs) modulate gene expression by repressing translation of targeted genes. Previous work has established a role for miRNAs in regulating vascular smooth muscle cell (VSMC) activity. Whether circular RNAs (circRNA) are involved in the modulation of miRNA activity in VSMCs is unknown. Objective: We aimed to identify circRNAs interacting with miRNAs enriched in VSMCs and modulating the cells' activity. Methods and Results: RNA sequencing and bioinformatics identified several circRNAs enriched in VSMCs; however, only one, possessing multiple putative binding sites for miR-145, was highly conserved between mouse and man. This circRNA gemmed from alternative splicing of lipoprotein receptor 6 (Lrp6), a gene highly expressed in vessels and implicated in vascular pathologies, and was thus named circ_Lrp6. Its role as a miR-145 sponge was confirmed by determining reciprocal interaction through RNA immunoprecipitation, stimulated emission depletion microscopy, and competitive luciferase assays; functional inhibition of miR-145 was assessed by measuring expression of the target genes ITGβ8, FASCIN, KLF4, Yes1, and Lox. The interaction was preferentially localized to P-bodies, sites of mRNA degradation. Using loss- and gain-of-function approaches, we found that circ_Lrp6 hindered miR-145-mediated regulation of VSMC migration, proliferation, and differentiation. Differential expression of miR-145 and circ_Lrp6 in murine and human vascular diseases suggests that the ratio of circ_Lrp6 bound to miR145 vs. unbound could play a role in vascular pathogenesis. Viral delivery of circ_Lrp6 shRNA prevented intimal hyperplasia in mouse carotids. Conclusions: circ_Lrp6 is an intracellular modulator and a natural sponge for miR-145, counterbalancing the functions of the miRNA in VSMCs.

ORGANISM(S): Mus musculus

PROVIDER: GSE99318 | GEO | 2018/12/05

REPOSITORIES: GEO

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Project description:Purpose: To explore the possible pathogenesis of venous thromboembolism from the perspective of circRNAs. Methods: The thrombus model of inferior vena cava in SD rats was established by stenosis method. Peripheral blood samples of DVT rats were collected at 1h, 6h,12h and 3d, which were sequenced with Illumina circRNAs and mRNA. The differential circRNAs and mRNA were analyzed by STEM analysis software. Clusters that can reflect the evolution of thrombus were selected for in-depth analysis, and circRNAs and mRNA were screened according to the pathway enrichment analysis of the selected clusters. Real time fluorescent quantitative PCR (qPCR) was used to verify and determine the candidate circRNAs and mRNA. The function of target circRNA was verified in DVT rats. The interacting miRNAs of circRNAs and mRNA were predicted by online database respectively. Candidate miRNAs were identified by integrating the related information of miRNAs and verified by qPCR. Results:The SD rat model of deep venous thrombosis was successfully established by the stenosis method. In model group, there were 736, 3691, 3406 and 2639 circRNAs up-regulated and 944, 327, 318 and 397 circRNAs down-regulated at 1h, 6h, 12h and 3d, respectively. Compared with Sham group, 169, 885, 298 and 500 mRNA were up-regulated and 231, 291,75 and 73 mRNA were down-regulated at 1h, 6h, 12h and 3d in model group, respectively. STEM analysis found that cluster 45 was similar to thrombus development. The pathway related to platelet function was selected in cluster 45, and 10 circrRNAs and 4 interacting mRNAs were selected for qPCR verification by combining the gene in platelet pathway and annotation gene of cluster 45 and mRNA-circRNA interaction network. According to qPCR results and whether ID is found in rat circRNA database (CIRCpedia-V2), CBT15_circR_3235 (ID in circpedia-v2: rno_CIRCpedia_1953) is determined as the target circRNA. In vivo，knockdown of rno_CIRCpedia_1953 attenuates the formation of DVT in rats. The potential target miRNAs of rno_CIRCpedia_1953 and Tuba4a were predicted by using online miRDB and miRWalk databases respectively, and rno-miR-3543, rno-miR-320-5p and rno-miR-26b-3p are preliminarily identified as potential target miRNAs that rno_CIRCpedia_1953 may combine to play the ceRNA mechanism. Conclusions: Animal model of DVT in rats was successfully established by stenosis method. High-throughput sequencing analysis of circRNAs showed that circRNAs participated in the evolution of DVT. According to STEM functional analysis of mRNA sequencing, a target circRNA rno_CIRCpedia _1953 was screened, verified and identified. rno_CIRCpedia_1953 may participate in the development of DVT by acting as miRNA molecular sponge.

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Circular non-coding LRP6 is a tissue-enriched circular RNA which regulates smooth muscle cell biology acting as a sponge for miR-145

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