Navigation Links
Isolate It All: siRNA miRNA ,,, Total RNA Native Protein

Emmanuel Labourier, Ambion, Inc


Isolate total RNA and native protein from the same sample
Enrich for small RNAs (<200 nt)
Ideal for assessing siRNA or miRNA expression and processing

Small interfering RNAs (siRNAs) and microRNAs (miRNAs) have emerged as powerful post-transcriptional regulators of gene expression in many different organisms, thus making the analysis of small RNA molecules increasingly important. In addition to monitoring small RNA expression, analysis of protein expression levels is critical for thorough analysis of the effects of small RNAs. In RNAi experiments, for example, exogenously introduced siRNAs are used to target the degradation of specific messenger RNAs (mRNAs), resulting in gene knockdown at both the mRNA and the protein level. In contrast, miRNAs are endogenous 21-24 nt RNAs that primarily act as repressors of translation and therefore affect only protein expression levels. Here we discuss a procedure for downstream monitoring of protein, mRNA, siRNA, and miRNA expression levels from the same experimental sample.


Two Kits in One
To isolate protein, small RNA and long RNA species from the same sample, Ambion scientists have developed a unique tool: the mirVana PARIS Kit. Quantitative recovery of small RNA during total RNA isolation requires optimized procedures; Ambion's mirVana miRNA Isolation Kit was specifically optimized for efficient isolation of RNA species smaller than 200 nt [1]. To develop the mirVana PARIS Kit, this technology was adapted and combined with the advantages of the PARIS Kit, the first commercially available kit designed to isolate both RNA and native protein from the same sample [2]. The result is a versatile kit for quantitative recovery of native protein and all RNA species, including small RNAs. A summary of each kit's specification is presented in Figure 1, and specific examples are provided below.


Figure 1. Which Kit to Choose?


Recover High Quality Total RNA
To assess the quality of total RNA isolated with the mirVana PARIS Kit, 1 x 106 HeLa cells were homogenized in the Cell Disruption Buffer provided with the kit. Because the homogenization is performed quickly on ice and in the presence of detergent, both protein and RNA can be recovered from the lysate. A fraction of the lysate can be used directly to analyze protein expression (e.g. Western blot, 2D gel electrophoresis) or for assays that require native protein (e.g. functional assay, reporter activity). For RNA isolation, the HeLa cell lysate was immediately mixed with an equal volume of 2X Denaturing Solution. This solution contains a high concentration of chaotropic denaturant, resulting in rapid inactivation of cellular ribonucleases. After a rapid extraction with Acid-Phenol:Chloroform (provided with the kit), total RNA was then purified from the mixture using an RNA-binding glass fiber filter (GFF) and optimized binding and wash buffers (also provided).

In parallel, total RNA was isolated from the same number of cells with the mirVana miRNA Isolation Kit and with the PARIS Kit (the latter is opimized for longer RNA isolation and does not recover small RNAs efficiently). Comparison of the purified material on a denaturing polyacrylamide gel showed equivalent recovery of small RNA with the mirVana and mirVana PARIS Kits, but RNA species smaller than ~200 nt were absent in the sample processed with the PARIS Kit (Figure 2A). Previous studies [1] demonstrated a correlation between loss of 5S rRNA and tRNA, and inefficient recovery of miRNA or siRNA (see also Figure 3 and 6) using standard GFF protocols. The integrity of the isolated total RNA was assessed on an RNA 6000 Nano LabChip with an Agilent 2100 bioanalyzer. As seen in Figure 2B, RNA isolated with the mirVana PARIS Kit was of high quality (28S/18S rRNA ratio 1.77). The presence of small RNA was evidenced by a clear peak at ~26 seconds.

Figure 2. Analysis of Total RNA Isolated with the mirVana PARIS Kit. Total RNA was isolated from 1 x 106 HeLa cells with the indicated kit as per protocol. (A) 1 g of total RNA was resolved on a 15% denaturing acrylamide gel and stained with ethidium bromide. (B) Electropherogram of total RNA purified with the mirVana PARIS Kit analyzed on an Agilent 2100 bioanalyzer.


Readily Enrich for Small RNAs
Small RNA analysis often requires the use of extremely large amounts of input RNA. Furthermore, small RNA and mRNA species are analyzed with techniques that are not compatible, for example gel purification or Northern blotting on 15% acrylamide gels for miRNA/siRNA vs. RT-PCR or microarray analysis for mRNA. With the mirVana PARIS Kit, fractions enriched in RNA species smaller than 200 nt and fractions containing only the longer RNA species can be prepared from the same experimental sample using differential binding conditions on GFF. Thus the kit allows for separate downstream analysis of protein, small RNA, and mRNA if required.

Representative data of enrichment/depletion of small RNAs obtained with the mirVana PARIS Kit are presented in Figure 3. The depleted and enriched fractions, or total RNA, were purified from the same number of HeLa cells in triplicate. Analysis of 1 g RNA on a denaturing agarose or acrylamide gel showed that 28S, 18S and 5.8S rRNA were quantitatively recovered in the fraction depleted in small RNA. In contrast, RNAs smaller than 200 nt, such as 5S RNA and tRNA, were significantly enriched in the corresponding "enriched" fraction when compared to the total RNA sample. Quantitative analysis of the same samples by Northern blot confirmed that smaller RNA species such as the microRNA miR-16 (22 nt) were also enriched ~10 fold (Figure 3B).

Figure 3. Small RNA Enrichment from Cultured Cells. Total RNA or fractions depleted or enriched in small RNA were isolated in triplicate from 1 x 106 HeLa cells with the mirVana PARIS Kit as per protocol. (A) 1 g of each fraction was resolved on a 1.2% denaturing glyoxal agarose gel and stained with ethidium bromide. (B) 1 g of each fraction was resolved on a 15% denaturing acrylamide gel and stained with ethidium bromide. After electrotransfer, miR-16 miRNA was detected by Northern blot with an antisense RNA probe 5' labeled and purified with the mirVana Probe & Marker Kit (Ambion).


Analyze siRNA, mRNA, and Protein Expression in RNAi Experiments
Researchers often need to assess the specificity of gene silencing experiments and to correlate knockdown of a target mRNA with a reduction in the corresponding protein levels. Determining expression levels of active siRNA is also an important parameter that needs to be assessed. Figure 4 demonstrates the effectiveness of the mirVana PARIS Kit for preparing samples for this type of experiment.

Figure 4. Using the mirVana PARIS Kit to Analyze RNAi Effect. 1.5 x 106 HUVECs were electroporated (800 V, 120 s, 2 pulses, 0.5 s between pulses) with 10 g of siRNA targeting GAPDH mRNA or Silencer Negative Control #1 (Ambion) in 400 l of siPORT siRNA Electroporation Buffer (Ambion) using 4 mm electroporation cuvettes and square wave type pulses. Total RNA and protein were isolated with the mirVana PARIS Kit 48 hours after electoporation. 1 g of total RNA was used to detect the indicated RNA species by Northern blot or by solution hybridization assay with the mirVana miRNA Detection Kit (Ambion). RNA probes were prepared by in vitro transcription (mRNA probes--MAXIscript Kit, Ambion) or by 5' end labeling (rRNA, miRNA and siRNA probes - mirVana Probe & Marker Kit, Ambion). Western blots were performed with 15 g of total protein and antibodies specific for GAPDH or Ku p70 (Ambion).


Here, GAPDH knockdown was triggered by electroporation of a GAPDH-specific siRNA into a primary human cell line (normal human umbilical vein endothelial cells, or HUVEC). A reduction of GAPDH expression was observed both at the mRNA and protein level in these cells, but not in HUVECs electroporated with Silencer Negative Control #1 siRNA. No variation in expression level was detected for the control mRNA (-actin), small RNAs (miR-16, 5S rRNA, 5.8S rRNA), or the control protein (Ku).


Compatible with Most Tissues
Although it was specifically designed to quickly process cultured cell samples, the mirVana PARIS Kit can also be used to isolate RNA and protein from most animal tissues. During the rapid homogenization step in Cell Disruption Buffer, RNA can be partially accessible to cellular ribonucleases. Thus, the procedure is not compatible with tissues that contain very high levels of these enzymes, such as pancreas or spleen. To test for potential loss of RNA integrity during sample homogenization, total RNA was isolated from four different mouse tissues with the mirVana PARIS Kit or the mirVana miRNA Isolation Kit. With the latter kit, tissue samples are homogenized directly in a solution containing a chaotropic denaturant, which reduces the opportunities for RNA degradation.

Comparison of the purified RNA on a denaturing gel showed no significant RNA degradation with either kit (Figure 5A). Most importantly, analysis of small RNA expression profiles showed no difference between the two procedures. let-7 microRNA was more abundant in brain than kidney, liver, or thymus, whereas both 5S and 5.8S rRNA were detected at the same level in all 4 tissues. As previously reported [3, 4], miR-124 was expressed only in brain. Together, these results show that homogenization in Cell Disruption Buffer prior to addition of chaotropic denaturant does not significantly affect RNA quality. The advantage is that this lysate contains native protein that can be used directly in a host of downstream applications [2, 5], such as two-dimensional gel electrophoresis (Figure 5B).

Figure 5. Isolation of Total RNA and Protein from Different Tissues. Total RNA and protein were isolated from 4 different mouse tissues (~50 mg) with the mirVana miRNA Isolation Kit (RNA only) or the mirVana PARIS Kit. (A) Small RNA analysis. One g of total RNA was analyzed by denaturing gel and Northern blot as described in Figures 2 and 3.(B) Two-dimensional gel analysis. About 125 g of total protein from mouse brain was resolved using a pH 4-7 IPG gel followed by a 8-16% SDS-PAGE and stained with Coomassie blue.


To further examine the compatibility of the mirVana PARIS Kit with tissues, the enrichment procedure was performed with mouse brain or kidney that were stored for several months in RNAlater, Ambion's tissue collection/stabilization solution. Previous studies showed that both high quality protein and RNA are recovered from RNAlater-treated samples [2, 6]. Analysis by denaturing acrylamide gel and Northern blot of the RNA samples purified with the mirVana PARIS Kit confirm that the procedure efficiently fractionates long and short RNA species (Figure 6). mRNAs and 5.8S rRNA were detected only in the "depleted" fraction, and the miRNAs let-7 or miR-124 were seen only in the "enriched" fraction.

Figure 6. Small RNA Enrichment from Mouse Tissues. Total RNA or fractions depleted or enriched in small RNA were isolated from RNAlater-treated mouse brain or kidney (~50 mg) with the mirVana PARIS Kit (A) 1 g of each fraction was resolved on a 15% denaturing acrylamide gel and stained with ethidium bromide. (B) mRNA, rRNA and miRNA expression was analyzed as described in Figure 4. This figure demonstrates the broad range of RNAs that can be obtained with this procedure, from miRNAs (~22 nt) to much larger mRNA species (in the kilobase range).


Versatile Isolation System
In summary, these results show that high quality total RNA and protein are efficiently recovered from cultured cells and several different tissue types with the mirVana PARIS Kit. The kit includes reagents for 40 protein and RNA isolations. Alternatively 20 enrichment/depletion procedures can be performed by sequential binding on two separate GFFs. Each purification can accommodate 100-107 cells or 1-100 mg of tissue. The entire procedure can be performed in less than 30 minutes and is compatible with RNAlater-treated samples.

The mirVana PARIS Kit is part of a growing family of tools dedicated to siRNA and miRNA expression, transfection, purification, and detection. To learn more about these exciting areas of research, please visit the siRNA and miRNA Resource web pages at http://www.ambion.com/index.html.


back to top


Ordering Information
Cat# Product Name Size 1556 mirVana PARIS Kit up to 40 purifications
'"/>

Source:


Page: All 1 2 3 4 5 6 7 8 9

Related biology technology :

1. Isolate and Analyze Total RNA from Cells Harvested by Laser Capture Microdissection
2. Restriction Digests of DNA Isolated with the Perfectprep Gel Cleanup Kit
3. A Better Way to Isolate RNA AND Protein From the Same Sample
4. Isolate Total RNA and Protein From the Same Sample
5. Isolate High Quality Total RNA from LCM Samples Suitable for Microarray and qRT-PCR Analysis
6. Custom and library siRNA for efficient gene silencing
7. Custom and library siRNA for efficient gene silencing
8. Cancer siRNA Oligo Set Version 1.0
9. Library siRNA
10. Custom siRNA Oligo Synthesis Service
11. Efficient RNAi-mediated gene silencing in neuronal cells using QIAGEN siRNA and TransMessenger Transfection Reagent*
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Isolate All siRNA miRNA Total RNA Native Protein

(Date:12/19/2014)... OR and Hershey, PA (PRWEB) December 19, 2014 ... Pink: BJCT), a leading developer and manufacturer of ... entered into an agreement with Immunomic Therapeutics, Inc. ... Biojector®-2000 needle-free injection device with its LAMP™ vaccine ... an option for an exclusive Worldwide license to ...
(Date:12/19/2014)... MA (PRWEB) December 19, 2014 Charm ... MRLAFMQ test for the Detection of Aflatoxin M1 in ... to receive independent third party validation. The peer reviewed ... Unit of the Institute for Agricultural and Fisheries Research ... Group. , Aflatoxin B1, the most toxic aflatoxin ...
(Date:12/19/2014)... BioPlus Specialty Pharmacy (BioPlus), ... promotion of Nick Maroulis, Pharm.D. to the newly created ... , In this position, Dr. Maroulis will continue to ... directors of our multi-site pharmacies as the company expands. ... during that time he has served in many different ...
(Date:12/19/2014)... EVANSTON, Ill. , Dec. 19, 2014 ... to develop novel drugs for diseases of the central ... Ph.D., president and chief executive officer, will present at ... Dr. Riedel,s presentation will take place at 3:00 p.m. ... St. Francis in San Francisco, Calif. ...
Breaking Biology Technology:Bioject and Immunomic Therapeutics Enter into an Agreement for License of Needle-Free Technology for LAMP-vax Vaccines 2Bioject and Immunomic Therapeutics Enter into an Agreement for License of Needle-Free Technology for LAMP-vax Vaccines 3Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2BioPlus Specialty Pharmacy Promotes Dr. Nick Maroulis to Vice President of Specialty Pharmacy Services 2Naurex to Present at 33rd Annual J.P. Morgan Healthcare Conference 2
... non-profit arm the SBC Foundation, has given $285,500 in ... Milwaukee has reported. , ,Twenty-four organizations that ... received money to help them use more technology. The ... which typically gives from $2,500 to $25,000 per organization. ...
... secretary of Wisconsins Department of Commerce, said on Friday that he ... partner in the law firm Quarles & Bradys Milwaukee office. , ... two years. He will be returning to the firm he worked ... deal from Governor Doyle as a leader, a boss, and a ...
... Having judged last years a success, the Wisconsin ... the second annual Wisconsin Governor's Business Plan Contest ... businesses will submit 250-word business proposals within one of ... business services. The proposals will be accepted until January ...
Cached Biology Technology:Secretary Nettles leaving Commerce for law practice 2Secretary Nettles leaving Commerce for law practice 3Governors business-plan competition starts another round 2Governors business-plan competition starts another round 3
(Date:12/19/2014)... Research and Markets ( http://www.researchandmarkets.com/research/8kmfcn/iphone_5s ... "iPhone 5S Fingerprint Sensor - Apple/AuthenTec TMDR92 & ... offering. http://photos.prnewswire.com/prnh/20130307/600769 ... July 2012, Apple introduced the fingerprint reading feature ... only device of Apple incorporating such a feature, ...
(Date:12/19/2014)... --Research and Markets ( http://www.researchandmarkets.com/research/86ncd6/micro_market ) has ... North America Perimeter Security Systems Market" report to ... The North American perimeter security market is ... 2014 to 2019. Although the U.S. market holds a ... is expected to grow at a higher CAGR ...
(Date:12/19/2014)... , Dec. 18, 2014  23andMe, Inc., the leading ... study that pinpoints fine-scale differences in genetic ancestry of ... . Since immigrants first arrived more than ... has served as a meeting place for ... history and the ongoing mixing of peoples with African, ...
Breaking Biology News(10 mins):iPhone 5S Fingerprint Sensor - Apple/AuthenTec TMDR92 & Sapphire - Technology Report 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 323andMe Study Sketches Genetic Portrait of the United States 223andMe Study Sketches Genetic Portrait of the United States 323andMe Study Sketches Genetic Portrait of the United States 4
... , Sept. 4, 2013  Rapid growth in microRNA (miRNA) ... its diagnostic and therapeutic potential, has fuelled development ... Of the various miRNA technologies, which include quantitative ... functional tools, qRT PCR remains the fastest-growing, while ...
... . Families of thousands of victims of ... appropriate punishment, because of a suite of technologies able ... graves, perhaps hundreds of thousands remain undiscovered. Researchers at ... Ridge National Laboratory are developing a method to discover ...
... pleased to announce that the 2014 HFSP Nakasone Award ... Institute of Science for his pioneering work in discovering ... single most important foundation of the field of systems ... of genetic circuits to systematic analysis and understanding. ...
Cached Biology News:Frost & Sullivan: Diagnostic and Therapeutic Potential of microRNAs Stimulate Need for More Research Tools 2Frost & Sullivan: Diagnostic and Therapeutic Potential of microRNAs Stimulate Need for More Research Tools 3Frost & Sullivan: Diagnostic and Therapeutic Potential of microRNAs Stimulate Need for More Research Tools 4September 2013 story tips 2September 2013 story tips 3The 2014 HFSP Nakasone Award goes to Uri Alon 2
... The SPD101B is a no-frills, basic SpeedVac ... Although economically priced, this unit still features ... a digitial display of time and heat. ... samples and accepts a wide variety of ...
Digital display of time, vacuum and temperature , Dual vacuum control of ramping rate and ultimate level , Comes complete with RH40-12 (40 x 1.5 ml) Rotor and (2) Glass Condensation Flasks. ...
... The DNA120 is a dedicated concentrator for ... precipitates of DNA/RNA. The integrated system combines ... pump. The compact design, automatic pump and ... run time; one for heater time), makes ...
For absolute protein quantification. 4 peptides in 5 vials x 2 nmol per peptide...
Biology Products: