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8 protocols using control mimic

1

Transient Transfection of Viral miRNA Mimics

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Transient transfections were performed using Lipofectaine 2000 reagent (Life Technologies, San Diego, CA, USA) according to manufacturer’s instructions. Red siGLO oligos (Thermo Fisher Scientific, Waltham, MA, USA) were used to determine transfection efficiency. After 36 h, cells were harvested for protein detection or RNA isolation. Cells were transfected with viral miRNA mimics (Qiagen, Gaithsburg, MD, USA) at a final concentration of 15 nM for 36 h. Controls consisted of mock transfected and control mimic (Qiagen) transfected cultures. Levels of viral miRNAs were used to determine transfection efficiency using miScript PCR primer assays as described above.
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2

HUVEC Transfection and Plasma Treatment

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Human umbilical vein endothelial cells (HUVECs) (ATCC-CRL-1730) were cultured in F-12K medium (ATCC-100-010) with 10% FBS (ATCC-30-2020) according to the instructions provided by ATCC.
HUVECs were transfected with 1 mg of luciferase reporter constructs, and either 20 nmoles of either 328a-3p microRNA mimic (Qiagen, Hilden, Germany, cat # 219600-MSY0000752-5 ‘CUGGCCCUCUCUGCCCUUCCGU), control mimic (Qiagen cat # 339173 -YM00479902), inhibitor (Qiagen, cat# 339121 (YI04101608), 5 ‘CUGGCCCUCUCUGCCCUUCCGU) or control inhibitor (Qiagen cat# 339125-YI00199006) using FuGENE 6 reagent according to the manufacturer’s instructions (Roche, Indianapolis, IN, USA). The media was changed after 1–2 h to serum-free media and the cells were harvested 24 h post-transfection.
Fetal bovine serum (FBS)–starved HUVECs (for 24 h) in 1 mL of medium were treated for 24 h with either 25, 50, or 100 μL of pooled human plasma from normal controls, patients with either CAD or ectasia. In separate experiments, FBS-starved HUVECs were also treated with endotoxin-free (according to the manufacturer) human recombinant HSP70 (0.5 ng/mL, StressMarq Biosciences, Victoria, BC, Australia), S100B (0.1 ng/mL) or HMGB1 (10 ng/mL, R&D Systems, Minneapolis, MN, USA).
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3

Viral miRNA Transfection Optimization

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Transient transfections were performed using Lipofectaine 2000 reagent (Life Technologies, San Diego, CA) according to manufacturer’s instructions. Red siGLO oligos (ThermoScientific, Waltham, MA) were used to determine transfection efficiency. After 36 hours, cells were harvested for RNA isolation. Cells were transfected with viral miRNA mimics at increasing concentrations of 10, 20 and 50 nM (to determine dose effects) for 36 hours. We noticed robust (~90%) transfection at 20 nM, therefore, we used the same concentration for most of the experiments unless specified. Controls consisted of mock transfected and control mimic (Qiagen) transfected cultures.
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4

miRNA-Mediated Luciferase Reporter Assay

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B35 neuroblastoma cells were plated in a 96-well plate (Celltreat Scientific Products) at a concentration of 2.0×105 cells/ml and allowed to adhere overnight. The next day, cells were co-transfected with the appropriate Luciferase 3′ UTR reporter plasmid, β-Galactosidase control, and 100 nM of miR-200a, miR-200b or control mimic (Qiagen) per well using Lipofectamine 3000 (Invitrogen). After 48 h, luciferase activity was determined using Dual Light Luciferase & β-Galactosidase Reporter Gene Assay System (ThermoFisher Scientific) according to the manufacturer's protocol.
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5

Transient Transfection of miRNA Mimics

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For transient transfection, cells at 50% confluence were transfected with miRNA mimics or control mimics (Qiagen) using Lipofectamine3000 (Invitrogen) according to the manufacturer's instructions.
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6

Optimization of miR-30c Modulation in Bovine Embryo Culture

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Since individually cultured embryos have less tolerance when compared to group cultured embryos (Goovaerts et al., 2009 (link); Wydooghe et al., 2014a (link),b (link)) and they easily die after changing the culture environment, group culture was performed for miR-30c functional analysis instead of individual culture. The IVF embryos were produced according to the previously described protocol. This time, however, presumed zygotes were vortexed for 3 min after 21 h incubation, washed with IVF-TALP and transferred to drops of SOF supplemented with ITS, BSA and miR-30c mimics (chemically synthesized, double-stranded RNAs which mimic mature endogenous miRNAs after delivery to cells) or control mimics (chemically synthesized, double-stranded RNAs which have no homology to any known microRNA or mRNA sequences) (Qiagen, Germantown, United States) with a final concentration of 1 μM according to the instructions. Culture occurred in groups of 25 in drops of 50 μl, covered with mineral oil at 38.5°C in 5% CO2, 5% O2, and 90% N2. On 8 dpi, blastocyst rates were calculated. Blastocysts were collected for RT-qPCR or assessed with apoptosis staining.
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7

Dual Luciferase Assay for miRNA Targets

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Dual luciferase experiments were performed as previously described (16 (link), 17 (link), 30 (link), 32 (link)). In brief, HEK293 cells were seeded at the density of 3×104 cells/well (96-well plate) in DMEM supplemented with 10% fetal bovine serum. All transfections were performed in quadruplicate using 0.5 μL Lipofectamine 2000 (Invitrogen), 120 ng dual luciferase reporter control (CmiT000001-MT06 miRNA Target clone control vector for pEZX-MT06) or plasmids containing human VCL (NM_003373.3; HmiT018467-MT06), human DAB2 (NM_001244871.1; HmiT055467-MT06) or human SKAP2 (NM_001303468.1; HmiT067400-MT06; All from GeneCopoeia Incorporated, Rockville, MD, USA) were co-transfected with a final concentration of 1 pmol, 5 pmol and 10 pmol of synthetic miR-142–3p or control mimics (10 pmol) (Qiagen). After 36 h post-transfection, cells were lysed in passive lysis buffer (Promega Corporation) and dual luciferase assays performed using the multilabel reader Victor™ x5 (PerkinElmer 2030-Perkin Elmer Health Sciences Inc, Shelton, CT, USA). For each reporter 3′UTR construct, the Rluc/Fluc value obtained was normalized to the value obtained for pEZX-MT06 no-insert control (EV) co-transfected with the same miRNA mimic. The values obtained were plotted as histograms, where EV is set at one.
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8

Vezf1 3'UTR Luciferase Assay

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A 400-base pair segment of the 3′UTR of Vezf1 containing the binding site for miR-150-5p was cloned into the pIS0 Firefly luciferase reporter (Addgene) using NheI and SacI restriction sites. The DNA fragment was amplified from mouse genomic DNA using the following primers: Forward 5′-GGGGAGCTCACAGAGTCAAAATTGGG-3′ and Reverse 5′-GGGGCTAGCGGTTCCGTCCACCTTGT-3′. HeLa cells were transfected with the pIS0 3′UTR Vezf1 reporter or a reporter mutated at the putative miR-150-5p-binding site in the Vezf1 3′UTR using the Q5® Site-Directed Mutagenesis Kit (New England Biolabs) along with the pIS2 Renilla vector (Addgene). HeLa cells were also cotransfected with 50 nM miR-150-5p miRCURY LNA™ mimics or control mimics (Qiagen). Dual-luciferase assays were performed using the Dual-Luciferase® Reporter Assay System (Promega Corporation) and luciferase activity was measured using the Infinite® 200 plate reader (Tecan).
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