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5 protocols using cdna synthesis kit

1

Quantifying miRNA and mRNA Levels by qPCR

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The cell or tissue samples were lysed using TRIzol reagent to obtain RNA. Subsequently, RNA was quantified using a NanoDrop2000 (Thermo Fisher Scientific, USA). Following the manufacturer’s protocol, RNA samples (1 μg) were assembled into cDNA using a cDNA Synthesis Kit (NEB, USA) or an miRNA First-Strand cDNA Synthesis Kit (GeneCopeia, USA). Next, cDNA was diluted and amplified by qPCR using a Universal qPCR Master Mix (SYBR) (NEB). The reaction was performed on a StepOne™ Real-Time PCR System (Applied Biosystems, USA). GAPDH and U6 were used to normalize the data. Finally, the Ct value was calculated using the 2−ΔΔCt approach [20 ]. Table 1 lists the primer information.

Real-time PCR primer sequences

Gene nameSequence
miR-582–3pForward 5’-GCACACATTGAAGAGGACAGAC3’Reverse 5’-AACGCTTCACGAATTTGCGT-3’
RRM2Forward 5’- CACGGAGCCGAAAACTAAAGC-3’Reverse 5’- TCTGCCTTCTTATACATCTGCCA-3’
GAPDHForward 5’-TCAACGACCACTTTGTCAAGCTCA-3’Reverse 5’-GCTGGTGGTCCAGGGGTCTTACT-3’
U6Forward 5’-CTCGCTTCGGCAGCACA-3’Reverse 5’-AACGCTTCACGAATTTGCGT-3’
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2

RNA Isolation and qRT-PCR Analysis

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RNA was isolated from fresh tissues and cultured cardiomyocytes using the TRIzol reagent purchased from Thermo Fisher. Two micrograms of RNA was subjected to synthesize the first-strand cDNA by using the cDNA synthesis kit from New England Biolabs. Next, the mRNA expressions of target genes were analyzed with SYBR Green II qRT-PCR kit from QIAGEN on IQ5 (BioRAD). The forward and reverse primers used for quantitative real-time PCR are shown in Table 1.
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3

Transcriptional Profiling of P. aeruginosa Biofilms

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The 100 μL of P. aeruginosa pellet was collected from the SK plate and the LK medium for RNA extraction, respectively. The RNA was extracted using Trizol with BCP as a phase-separating agent, and cDNA was synthesized using a cDNA synthesis kit (New England BioLabs). qPCR was conducted in a CFX-96 real-time thermocycler (Bio-Rad) using SYBR green AzuraQuant Fast Green Fastmix (Azura). Primer sequences can be found in Table 1. Fold changes were calculated using a ΔCt method with 30S ribosomal protein S12 as a housekeeping gene. Each of the three biological replicates contained three technical replicates.

Quantitative PCR primers used in this project.

GenePrimerSequenceSource
pilIForwardATCGTCGATGAGGTGTTCGGthis study
ReverseCGCCATGAATGAAGGGTTGCthis study
pilJForwardAACGCAGGCAATCTTTTCGCthis study
ReverseGTCATGGTTCGACTGGGTGTthis study
pelAForwardTGGAACAGCCAGGTAATGGACthis study
ReverseAAGCTGTCCAGGGTATCGAGthis study
pelBForwardTCTGCCGCTGACAAGCATCthis study
ReverseCGCTGGGCATGAATACCTCTthis study
pa1LForwardGATCTGCCACGATGCGTTTTthis study
ReverseACCCGGTATTGACCGGAATGthis study
lecBForwardGGAGTGTTCACCCTTCCCGthis study
ReverseCGACGGTTTCGTTGTTGACCthis study
rpsLForwardCTGCGTAAGGTATGCCGTGTthis study
ReverseGTTGTGACCTTCACCACCGAthis study
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4

Transcriptional Profiling of p53 in HepG2 Cells

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Total RNA of HEPG2 cells was extracted by using NucleoSpin® RNA isolation kit (Macherey-Nagel, Germany) following the exposure of the cells to PC βCDC6 (1:16 vol/vol) for 24 h.
Extracted RNA was then converted to cDNA by harnessing cDNA synthesis kit (New England BioLabs, USA). Real-time polymerase chain reaction (RT-PCR) was executed using the cDNA samples to explore expression rates of TP53, and housekeeping gene GAPDH. RT-PCR assay was conducted utilizing SYBR green master mix (Thermo Fischer, USA) using Applied Biosystems ViiA™ 7 (USA) device. The relative changes at the transcriptional level of p53 gene in control and cells treated with PC βCDC6 were calculated using 2 -Ct , the comparative Ct method.
The primers for the assay were as follows: TP53 forward:
CACCATGAGCGCTGCCTCAGATAGC and reverse:
ACAGGCACAAACACGCACCTCAAA, GAPDH forward:
GTCGTATTGGGCGCCTGGTCAC and reverse: GCCAGCATCGCCCCACTTGATT.
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5

Quantification of Cytokine Genes in T Cells

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CD3+ T cells were co-cultured either with mDC only or mDC-MDA-MB-231 and then isolated by magnetic-activated cell sorting (MACS). Total RNA was extracted with Trizol (Invitrogen), and cDNA was synthesized using the cDNA Synthesis kit (NEB). A Light Cycler 480 II (Roche) was used to perform a SYBR Green-based qRT-PCR experiment. The house-keeping gene, GAPDH, was used for normalization. The qRT-PCR primers are as follows: human IL-1β, forward 5′-ACATCAGCACCTCTCAAGCA-3′ reverse 5′-AGTCCACATTCAGCACAGGA-3′; human IL-6, forward 5′-CTGGTCTTTTGGAGTTTGAGGT-3′ reverse 5′-GGAACTGGATCAGGACTTTTGT-3′; human IL-12, forward 5′-CCACAAAAATCCTCCCTTGA-3′ reverse 5′-AGGGACCTCGCTTTTTAGGA-3′; human GAPDH, forward 5′-TGACAACTTTGGTATCGTGGA-3′ reverse 5′-CAGTAGAGGCAGGGATGATGT-3′. Melting temperature was 60 °C.
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