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A3500

Manufactured by Promega
Sourced in United States

The A3500 is a high-performance benchtop centrifuge from Promega. It is designed for a wide range of laboratory applications, providing reliable and consistent results. The A3500 offers variable speed control, providing users the flexibility to adjust the centrifugal force as needed for their specific application.

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26 protocols using a3500

1

Quantitative Analysis of Metastatic Regulators

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Total RNA was extracted using TRIzol reagent (Invitrogen; Thermo Fisher Scientific, Inc.). Samples of 1 µg DNase I-treated RNA were reverse-transcribed to cDNA using the reverse transcription system A3500 (Promega Corporation, Madison, WI, USA). The PCR primer sets were synthesized by Takara Biotechnology Co., Ltd. (Dalian, China) and were as follows: GAPDH sense, 5′-GAAGGTGAAGGTCGGAGTC-3′ and antisense, 5′-GAAGATGGTGATGGGATTTC-3′; matriptase sense, 5′-GGGACACACCCAGTATGGAGG-3′ and antisense, 5′-CCGGAATCACCCTGGCAGGA-3′; uPA sense, 5′-AGAATTCACCACCATCGAGA-3′ and antisense, 5′-ATCAGCTTCAACAGTCAT-3′; uPAR sense, 5′-GAGCTGGTGGAGAAAAGCTG-3′ and antisense, 5′-TGTTGCAGCATTTCAGGAAG-3′; and MMP-2 sense, 5′-AGATCTTCTTCTTCAAGGAGACCGGTT-3′ and antisense, 5′-GGCTGGTCAGTGGCTTGGGGTA-3′. The thermocycling conditions of qPCR were as follows: 95°C for 15 sec, 45 cycles of denaturation at 95°C for 5 sec, annealing at 60°C for 20 sec, 95°C for 1 min and then cooled to 55°C. The relative levels of matriptase, uPA, uPAR and MMP-2 mRNA was quantified using the 2−ΔΔCq method (15 (link)) and normalized to GAPDH expression. Following qPCR analysis, the PCR products were also electrophoresed on 2% agarose gel stained with ethidium bromide.
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2

Single-Cell RNA Extraction and RT-qPCR Analysis

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Total RNA was extracted using the Norgen single-cell RNA purification kit (Norgen, 51800) with on-column DNase digestion (Norgen, 25710). Four-hundred nanograms of total RNA was transcribed to cDNA using the reverse transcription system (Promega, A3500) and random primers. qPCRs were performed using the SYBR Green PCR master mix (Applied Biosystems, 4309155) with standard cycling conditions. Unless indicated otherwise, data were normalized to Gapdh expression levels.
For splice isoform RT-qPCRs, the specificity of PCR products was analyzed by sequencing of PCR products. PSI values were calculated as described previously (Han et al. 2013 (link); Camacho Londoño and Philipp 2016 (link)) by the following formula:
PSI=100×2dCT(Exon)2dCT(Exon)+2dCT(Exonskip).
qPCR primer sequences are in Supplemental Table S11.
Sequencing library preparation was performed using either ScriptSeq 2 (Epicentre, SSV21106) or TruSeq 2 (Illumina, RS-122-2001) kits.
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3

Articular Cartilage RNA Extraction and qPCR

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A column cartilage RNA extraction kit (Tiandz, China) was used to isolate total RNA from articular cartilage, while total RNA was extracted from cultured cells using a HiPure Total RNA mini kit (Magen, China). Samples were lysed in RL buffer, and the mixture was added to a gDNA filter mini column to filter out the DNA. The column was discarded, and 70% ethanol solution was added to the filtrate (equivolume mixes). Then, the mixture was added to a HiPure RNA mini column and centrifuged, and the RNA was adsorbed on the column. The column was washed three times with RW buffer, and 40 µl of RNase-free water was added to the column, which was then centrifuged. Then, the total RNA solution was obtained and stored at −80°C. The concentration and quality of the RNA were quantified using a NanoDrop spectrophotometer (Thermo Scientific, USA). cDNA was obtained by a reverse transcription system (A3500, Promega, USA) according to the manufacturer's instructions and was then stored at −20°C until use.
qPCR was performed with SYBR Green Realtime PCR Master Mix according to the manufacturer's instructions. The relative expression was calculated based on the ΔΔCt method using the following equations: ΔΔCt = (Ct target–Ct actin) treatment–(Ct target–Ct actin) control and fold change = 2−ΔΔCt.
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4

Real-Time qPCR of Brain Tissue

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Real-time PCR was carried out as described previously38 (link),39 (link). Total RNA was purified from brain tissue using TRIzol reagent (15596018, Invitrogen Life Technologies, Carlsbad, CA, USA) and was treated with DNase I (M610A, Promega, MO, USA) to eliminate genomic DNA contamination. Reverse transcription of total RNA (2 μg) was conducted in a volume of 20 μl using a reverse transcription system (A3500, Promega, MO, USA). Real-time PCR was performed with 10 μl of 2X iQ™ SYBR Green Supermix (#170882, Bio-Rad Laboratories, Foster City, CA, USA), 1 μl each of 5 pmol/μl forward and reverse primers, and 4 μl of complementary DNA (cDNA) (1/8 dilution of the conversion) in a total volume of 20 μl using a CFX 96 Real-Time PCR System Detector (Bio-Rad Laboratories). The Bio-Rad CFX Manager 3.1 was used to analyze qPCR data. The primer sets used in PCR were listed in Supplementary Data 5.
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5

Total RNA Extraction and qRT-PCR Analysis

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TRIzol Reagent (15596‐018; Invitrogen) was used for total RNA extraction, and then total RNA was reverse‐transcribed into cDNA with reverse transcription system (A3500; Promega). Quantitative real‐time reverse transcription polymerase chain reaction (qRT‐PCR) was performed using SYBR Premix Ex Taq kit (RR420A; TaKaRa) on a Stratagene Mx3000P quantitative PCR system (Genetimes Technology). The PCR program was 95°C, 10 minutes; 95°C, 15 seconds, 60°C, 1 minute, 40 cycles. There were three technical repetitions for all the reactions. The primers used in the study are listed in Table S1.
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6

Quantifying Gene Expression by RT-qPCR

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Total RNA was extracted from cell lines using Trizol reagent according to the manufacturer’s instructions (Invitrogen®). The quantity and quality of the isolated RNA were checked using NanoDrop™ One Spectrophotometer (Thermo Scientific® [Asnières sur Seine, France]). Reverse transcription of 1 mg of total RNA into first strand cDNA was done using the reverse transcription system (A3500, Promega® [Charbonnières-les-Bains, France]). Fast SYBR Green master mix (Applied Biosystems® [Asnières sur Seine, France]) was used to perform the real-time quantitative PCR on a StepOnePlus system (Applied Biosystems®). The relative expression was calculated using the ∆Ct method and RPLP0 mRNA level was used as the endogenous control to normalize relative expression values of each target genes. Gene-specific primer sequences are summarized in the Table S2 in Supplementary Materials.
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7

Reverse Transcription and qPCR Quantification

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Total RNA was isolated using the RNeasy Plus Micro Kit (Qiagen, Germany, 74,034) according to the manufacturer’s protocol. Then, RNA concentration was determined by NanoDrop 2000 (Thermo Fisher) and cDNA was obtained from total RNA (50 ng) of each sample by reverse transcription using oligo (dT)15 and reverse transcriptase (Promega, USA, A3500), according to the manufacturer’s instructions, at 42 °C for 15 min, followed by 95 °C for 5 min in 20 μl total volume.
Quantitative real-time PCR was performed using SYBR Green Master Mix (ABI, Germany, DBI-2044) in an Applied Biosystems 7500 Real-Time PCR System. An aliquot (10%) of cDNA was subjected to 40 amplification cycles of PCR with the primers listed in Supplementary Table 1. Cycling parameters were one cycle for 2 min at 50 °C, one cycle for 10 min at 95 °C, 40 cycles at 95 °C for 15 s, and 60 °C for 20 s. For each experiment, three replicates were included in each qPCR reaction. We performed melting curve analysis at the end of each run to ensure a single amplicon.
The relative levels of endogenous β-actin mRNA (ACTB) mRNA were used as an internal control [40 (link)], and data were analyzed using the 2-(△△Ct) method. Only samples whose cycle threshold (Ct) values of ACTB were between 21 and 22 were included in the analysis.
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8

Quantifying Gene Expression in Bladder Tissue

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Total RNA was extracted from wild type and MIF knockout mouse bladder tissue through Trizol (15596026, ThermoFisher Scientific, Grand Island, NY), DNA removed by DNase, and reversed transcribed to cDNA (A3500, Promega, Madison, WI). SYBR green (4472903, ThermoFisher Scientific, Grand Island, NY) was utilized with primers (HMGB1, PPM05059F; Rn18s, PPM72041A, Qiagen, Germantown, MD) to quantified level of mRNA in bladder tissue from wild type and MIF knockout mice. 18S rRNA was used as the internal control.
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9

Quantitative RT-PCR for Gene Expression

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Total RNA was purified from cultured cells using TRIzol reagent (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol. For first-strand cDNA synthesis, 1 µg total RNA was transcribed to cDNA using a reverse-transcription system with random hexamers (A3500; Promega Corporation) according to the manufacturer's protocol. RT-qPCR was performed on a StepOnePlus Real-Time PCR system with Power SYBR-Green PCR Master Mix (Applied Biosystems; Thermo Fisher Scientific, Inc.). The PCR was performed with 1 µl cDNA in a 20 µl reaction mixture comprising 10 µl Power SYBR Green PCR Master Mix, 2 µl primers and 7 µl PCR-grade water. The PCR program was as follows: A denaturation step at 95°C for 10 min, 40 cycles each of 95°C for 15 sec and 60°C for 1 min. Quantification of gene expression data was calculated using the 2−ΔΔCq method the crossing point of the target genes with β-actin was calculated using the formula 2-(target gene−β−actin) and the relative amounts were quantified (39 (link)). The sequences of the gene-specific primers used (Bioneer Corporation, Daejeon, Korea) are listed in Table I.
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10

Quantifying CDC25B Gene Expression

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Complementary DNA was manufactured using the Reverse Transcription System
according to the manufacturer’s protocol (A3500; Promega, Madison, WI, USA),
then amplified by RT-qPCR using TaqMan probes purchased as Assays-on-Demand
Products for Gene Expression (Life Technologies, Carlsbad, CA, USA) and a
7500 Fast Real-Time PCR instrument (Life Technologies, USA). The
GAPDH gene was selected as an internal control.3
All RT-qPCRs were performed in triplicate for the target gene
(CDC25B: Hs00244740_m1) and the internal control
(GAPDH: NM_002046.3).
The relative quantification (RQ) of gene expression was calculated according
to Livak and Schmittgen.32 (link)
In tissue sample analyses, the corresponding control sample was
designated as a calibrator from each tumor. In the cell line analysis, the
siRNA control-transfected cells were used as a calibrator. The gene
expression in the MNP01 was also designated as a calibrator from all GC cell
lines.
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