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6 protocols using superscript 3 first strand synthesis for rt pcr

1

RNA Isolation and cDNA Synthesis

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Total RNA from isolated tissue samples (25–50 mg per sample) and cells (13.5 × 106 cells per sample) was isolated using the RNeasy Mini Kit (Qiagen, 74106), including on-column DNase treatment, according to the manufacturer’s instructions, and stored at −80°C. Prior to cDNA synthesis, total RNA was treated with DNase I, Amplification Grade (Invitrogen), and cDNA was synthesised using random primers (300 ng) and Superscript III First-Strand Synthesis for RT-PCR (Invitrogen). cDNA samples were diluted 25× in nuclease-free water prior to real-time quantitative PCR (RT-qPCR) analysis.
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2

RNA Isolation and cDNA Synthesis

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Total RNA from cells in RLT lysis buffer (Qiagen, 79216) was isolated using the RNeasy mini Kit (Qiagen, 74106), including on-column Dnase treatment, according to the manufacturer's instructions, and stored at −80 °C. Prior to cDNA synthesis, 750 ng RNA was treated with DNase I, Amplification Grade (Invitrogen), and cDNA was synthesized using random primers (300 ng, Invitrogen) and Superscript III First-Strand Synthesis for RT-PCR (Invitrogen). cDNA samples were diluted in nuclease-free water prior to real-time quantitative PCR (RT-qPCR) analysis.
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3

RNA Extraction and RT-qPCR Quantification

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Total RNAs were extracted using the RNeasy mini kit (Qiagen, CA, USA) and complementary cDNA was synthesized using 2 μg of RNA in a 20 μl reaction mixture using SuperScript III First-Strand Synthesis for RT-PCR (Invitrogen, Carlsbad, CA). RT-qPCR was performed using SYBR GREEN Reagents (Brilliant® II SYBR® Green QPCR Master Mix, Agilent Technologies). All primers sets were previously screened for efficiency and their sequences were VEGF-A (F): 5′ACACATTGTTGGAAGCAGCCC-3′, (R): 5′-AGGAAGGTCAACCACTCACACACA-3′; bFGF (F): 5′-AGAAGAGCGACCCTCACATCA-3′, (R): 5′-CGGT TAGCACACACTCCTTTG-3′; GAPDH (F): 5′-GGTC TCCTCTGACTTGAACA-3′, (R): 5′-GTGAGGGTCTCT CTCTTCCT-3′. All values were normalized to GAPDH housekeeping gene and expressed as relative expression or fold change using the respective formulae 2− ΔΔCt.
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4

Quantifying mRNA Expression in MSCs and HUVECs

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Total RNA from MSCs and HUVECs was extracted following manufacturer’s instructions in the RNeasy mini kit (Qiagen, Valencia, CA, USA). Quantitative real-time PCR (RT-PCR) was carried out using an iQ SYBR Super-mix (Bio-Rad, Hercules, CA, USA) on an iQ5 real-time system [28 (link)]. In brief, cDNA was synthesized using SuperScript III First-Strand Synthesis for RT-PCR (Invitrogen, Carlsbad, CA, USA) and amplified using Taq DNA polymerase in the presence of primers (Table 1). The expression of target mRNA relative to Glycer-aldehyde-3-phosphate dehydrogenase (GAPDH) was calculated based on the threshold cycle (CT) as r = 2−Δ (ΔCT), where ΔCT = CT target − CT GAPDH and Δ(ΔCT) = ΔCT experimental − ΔCT control.
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5

Quantitative Analysis of miRNA and mRNA

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CD4+ T cells from spleen and lymph nodes of mice were enriched with the EasySep Mouse CD4+ T Cell Isolation Kit (Stemcell Technologies). Cells were lysed in Trizol LS (Life Technologies), total RNA was isolated, and RNA was then quantified with a ND-1000 spectrophotometer (NanoDrop). Reverse transcription of miRNA was performed with the NCode miRNA First-Strand cDNA Synthesis Kit (Life Technologies). Forward primers were the mature miRNA sequence (45 (link)) and a universal reverse primer was used from the kit. Expression values were normalized to 5.8S ribosomal RNA (F: ATCGTAGGCACCGCTACGCCTGTCTG). Reverse transcription of mRNA was performed with SuperScript III First-Strand Synthesis for RT-PCR (Invitrogen). Primers for Smad4 total transcript were CACAATGAGCTTGCATTCCAG (F) and ACCTTAAACGTCTCTCCTACCT (R). Primers for Smad4 extended transcript were CTGAGTCACTATACGAAGTGGAAT (F) and GTCATTTAGCAGAAGGTGTCTTG (R). Expression values were normalized to Gapdh (F: GTGTTCCTACCCCCAATGTGT; R:ATTGTCATACCAGGAAATGAGCTT). qPCR was performed in technical duplicates using FastStart Universal SYBR Green Master mix (Roche) on a Realplex2 instrument (Eppendorf).
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6

Quantification of Firefly Luciferase Expression

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Total RNA was isolated from metastatic tissue and used as a template to produce cDNA using SuperScript III First-Strand Synthesis for RT-PCR (Invitrogen, Carlsbad, CA, USA). The synthesized cDNA was amplified using Taq DNA polymerase (iNtRON Biotechnology, Inc., Daejeon, Korea) with the fLuc primer: forward, 5′-CGC CTT GAT TGA CAA GGA TGG-3′, and reverse, 5′-GGC CTT TAT GAG GAT CTC TCT-3′. The forward rat GADPH primer was 5′-CAG TGC CAG CCT CGT CTC AT-3′ and the reverse primer was 5′-AGG GGC CAT CCA CAG TCT TC-3′.
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