Name: detection of microrna expression in peritoneal membrane of rats using quantitative real-time pcr
Uploaded: 2017-06-27T14:00:00
Description: Watch this Scientific Journal Video about Detection of microRNA Expression in Peritoneal Membrane of Rats Using Quantitative Real-time PCR at JoVE.com

We would like to thank Miyako Shigeta for her excellent technical support. This work was partially supported by JSPS KAKENHI (grant number 25461252).

All animal experimental protocols were approved by the animal ethics committee of Jichi Medical University and were performed in accordance with the Use and Care of Experimental Animals guidelines from the Jichi Medical University Guide for Laboratory Animals.
1. Peritoneum Sample Collection
<ol>
	<li>Collect the following items: 50 mL centrifuge tube with cotton drenched in isoflurane, cork sheet, Petri dish with phosphate-buffered saline (PBS), surgical scissors, and forceps.</li>
	<li>Eut...

<ol>
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Using the protocol presented in this manuscript, miRNAs in rat peritoneal membrane were successfully purified and detected using qRT-PCR. The reliability of qRT-PCR data analysis depends on the quality of purified miRNAs. Therefore, the purity of miRNAs may be checked before qRT-PCR by the ratio of absorbance at 260 nm to that at 280 nm, which can be measured using a spectrophotometer. When significant amplification of miRNA cannot be obtained using qRT-PCR, the concentration of template cDNA may be increased. The concen...

MicroRNAs (miRNAs) are short, noncoding RNAs that post-transcriptionally regulate messenger RNA (mRNA) expression1. Changes in the expression of miRNAs regulate the expression of many mRNAs that play pivotal roles in various pathological conditions, including cancer, inflammation, metabolic disorders, and fibrosis2,3,4,5,6,7,8. Therefore, miRNAs have potential as novel biomarkers and therapeutic targets2,3,4,5,6,7,8. The miRNA expression profile has been determined in various rat organs and tissues, including liver, heart, lung, and kidney9. However, standard methods for the purification and detection of miRNAs in rat peritoneal membrane have not been well established.
The overall goal of this protocol is to successfully purify and detect miRNAs in the rat peritoneal membrane. First, the peritoneal membrane sample was homogenized using a glass homogenizer, followed by exposure to a biopolymer-shredding system in a microcentrifuge spin column10. Next, total RNA including miRNA was purified from the peritoneal membrane sample using a silica-membrane-based spin column10. Then, cDNA was synthesized from the purified total RNA using reverse transcriptase, poly(A) polymerase, and oligo-dT primer11. Finally, the expression of miRNA was determined by qRT-PCR using an intercalating dye11. The rationale of this protocol is based on previous studies that showed significant purification and detection of miRNA in tissues by a simple process8,10,11. It has been reported that the use of a biopolymer-shredding system in a microcentrifuge spin column and silica-membrane-based spin column can purify high-quality total RNA from tissues10. The method of synthesizing cDNA from purified total RNA using reverse transcriptase, poly(A) polymerase, and oligo-dT primer, and the method of detecting miRNA expression by qRT-PCR using intercalating dye in this protocol have been reported to show high accuracy and sensitivity11. In addition, this is a simple process, which saves time and prevents technical error. Therefore, this protocol is useful in studies that require highly accurate and sensitive detection of miRNA in rat peritoneal membrane in a wide range of pathological conditions.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>QIA shredder</td>
			<td>Qiagen</td>
			<td>79654</td>
			<td>biopolymer-shredding system in a micro centrifuge spin-column</td>
		</tr>
		<tr>
			<td>miRNeasy Mini kit</td>
			<td>Qiagen</td>
			<td>217004</td>
			<td>silica-membrane based spin column</td>
		</tr>
		<tr>
			<td>QIAzol Lysis Reagent</td>
			<td>Qiagen</td>
			<td>79306</td>
			<td>phenol/guanidine-based lysis reagent</td>
		</tr>
		<tr>
			<td>Buffer RLT</td>
			<td>Qiagen</td>
			<td>79216</td>
			<td>wash buffer 1</td>
		</tr>
		<tr>
			<td>Buffer RWT</td>
			<td>Qiagen</td>
			<td>1067933</td>
			<td>wash buffer 2</td>
		</tr>
		<tr>
			<td>miScript II RT kit&#160;</td>
			<td>Qiagen</td>
			<td>218161</td>
			<td>includes 10&#215; Nucleics Mix containing deoxynucleotides, ribonucleotide triphosphates, and oligo-dT primers; miScript Reverse Transcriptase Mix containing poly(A) polymerase and reverse transcriptase and; miScript HiSpec buffer</td>
		</tr>
		<tr>
			<td>miScript SYBR Green PCR kit</td>
			<td>Qiagen</td>
			<td>218073</td>
			<td>includes QuantiTect SYBR Green PCR Master Mix and miScript Universal Primer</td>
		</tr>
		<tr>
			<td>RNU6-2 primer&#160;&#160;</td>
			<td>Qiagen</td>
			<td>MS00033740</td>
			<td>not disclosed</td>
		</tr>
		<tr>
			<td>miRNA-142-3p primer</td>
			<td>Qiagen</td>
			<td>MS00031451</td>
			<td>5&#39;-UGUAGUGUUUCC 
			UACUUUAUGGA-3&#39;&#160;&#160;</td>
		</tr>
		<tr>
			<td>miRNA-21-5p primer</td>
			<td>Qiagen</td>
			<td>MS00009079</td>
			<td>5&#39;-UAGCUUAUCAG 
			ACUGAUGUUGA-3&#39;</td>
		</tr>
		<tr>
			<td>miRNA-221-3p primer</td>
			<td>Qiagen</td>
			<td>MS00003857</td>
			<td>5&#39;-AGCUACAUUGU 
			CUGCUGGGUUUC-3&#39;</td>
		</tr>
		<tr>
			<td>miRNA-223-3p primer</td>
			<td>Qiagen</td>
			<td>MS00033320</td>
			<td>5&#39;-UGUCAGUUUG 
			UCAAAUACCCC-3&#39;</td>
		</tr>
		<tr>
			<td>miRNA-34a-5p primer</td>
			<td>Qiagen</td>
			<td>MS00003318</td>
			<td>5&#39;-UGGCAGUGUCU 
			UAGCUGGUUGU-3&#39;</td>
		</tr>
		<tr>
			<td>miRNA-327 primer</td>
			<td>Qiagen</td>
			<td>MS00000805</td>
			<td>5&#39;-CCUUGAGGGG 
			CAUGAGGGU-3&#39;</td>
		</tr>
		<tr>
			<td>MicroAmp Optical 96 well reaction plate for qRT-PCR</td>
			<td>Thermo Fisher Scientific</td>
			<td>4316813</td>
			<td>96-well reaction plate</td>
		</tr>
		<tr>
			<td>MicroAmp Optical Adhesive Film&#160;</td>
			<td>Thermo Fisher Scientific</td>
			<td>4311971</td>
			<td>adhesive film for 96-well reaction plate</td>
		</tr>
		<tr>
			<td>QuantStudio 12K Flex Flex Real-Time PCR system</td>
			<td>Thermo Fisher Scientific</td>
			<td>4472380</td>
			<td>real-time PCR instrument</td>
		</tr>
		<tr>
			<td>QuantStudio 12K Flex Software version 1.2.1.</td>
			<td>Thermo Fisher Scientific</td>
			<td>4472380</td>
			<td>real-time PCR instrument software</td>
		</tr>
		<tr>
			<td>methylglyoxal</td>
			<td>Sigma-Aldrich</td>
			<td>M0252</td>
			<td></td>
		</tr>
		<tr>
			<td>Midperic</td>
			<td>Terumo</td>
			<td>not assign&#160;</td>
			<td>peritoneal dialysis fluid</td>
		</tr>
		<tr>
			<td>Sprague&#8211;Dawley rats</td>
			<td>SLC</td>
			<td>not assign&#160;</td>
			<td></td>
		</tr>
	</tbody>
</table>

detection of microrna expression in peritoneal membrane of rats using quantitative real-time pcr

MicroRNAs (miRNAs) are small noncoding RNAs that regulate messenger RNA expression post-transcriptionally. The miRNA expression profile has been investigated in various organs and tissues in rat. However, standard methods for the purification of miRNAs and detection of their expression in rat peritoneal membrane have not been well established. We have developed an effective and reliable method to purify and quantify miRNAs using quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR) in rat peritoneal membrane. This protocol consists of four steps: 1) purification of peritoneal membrane sample; 2) purification of total RNA including miRNA from peritoneal membrane sample; 3) reverse transcription of miRNA to produce cDNA; and 4) qRT-PCR to detect miRNA expression. Using this protocol, we successfully determined that the expression of six miRNAs (miRNA-142-3p, miRNA-21-5p, miRNA-221-3p, miRNA-223-3p, miRNA-327, and miRNA-34a-5p) increased significantly in the peritoneal membrane of a rat peritoneal fibrosis model compared with those in control groups. This protocol can be used to study the profile of miRNA expression in the peritoneal membrane of rats in many pathological conditions.

The results presented here are based on our previously reported study8. We investigated the miRNA expression profile in peritoneal fibrosis. Peritoneal fibrosis is a major complication in peritoneal dialysis. It is characterized by loss of the mesothelial cell monolayer and the excess accumulation of extracellular matrix components, and is associated with peritoneal membrane failure14,15. A peritoneal fibro...

Watch this Scientific Journal Video about Detection of microRNA Expression in Peritoneal Membrane of Rats Using Quantitative Real-time PCR at JoVE.com

Detection of microRNA Expression in Peritoneal Membrane of Rats Using Quantitative Real-time PCR

Here we present a protocol for the detection of microRNA expression in rat peritoneal membrane using quantitative real-time reverse-transcription polymerase chain reaction. This method is suitable for studying the microRNA expression profile in rat peritoneal membrane in several pathological conditions.

MicroRNAs (miRNAs) are small noncoding RNAs that regulate messenger RNA expression post-transcriptionally. The miRNA expression profile has been ...

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