Name: porous silicon microparticles for delivery of sirna therapeutics
Uploaded: 2015-01-15T14:00:00
Description: Watch this Scientific Journal Video about Porous Silicon Microparticles for Delivery of siRNA Therapeutics at JoVE.com

The authors acknowledge financial support from Houston Methodist Research Institute, the National Natural Science Foundation of China (Nos., 21231007 and 21121061), the Ministry of Education of China (Nos., 20100171110013 and 313058), the National Basic Research Program of China (973 Program No. 2014CB845604), and the Fundamental Research Funds for the Central Universities.

1. PCPS Particle Fremstilling <ol><li> Oxidere ikke-funktionaliserede porøse silicium partikler i en 30% opløsning af hydrogenperoxid ved 95 ° C i 2 timer. Aminere de oxiderede partikler i 2% (3- aminopropyl) triethoxysilan opløsning i isopropylalkohol i 2 dage ved 65 ° C med forsigtig omrøring. </li><li> Centrifugeres opløsningen i 30 minutter ved 18.800 xg og vaske partiklerne to gange i isopropylalkohol og tre gange i ethanol, ved hjælp af korte lydbehandling at suspendere pellet. Lad partiklerne i ethanolo...

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Denne protokol beskriver en fremgangsmåde til vellykket levering og transfektion af siRNA i celler. Især er levering af siRNA opnås ved anvendelse af en multifunktionel platform bestående af polykation-funktionaliserede psi partikler. Brugen af siRNA terapi har stort potentiale, f.eks kræftbehandling, som forskellige onkogener kan målrettes med høj specificitet. Der er derfor et behov for at udvikle siRNA levering køretøjer, der kan afbøde de udfordringer siRNA terapi. Afslutningsvis har vi skitseret ...

Små interfererende RNA&#39;er (siRNA&#39;er) er dobbeltstrengede RNA-molekyler, der kan undertrykke ekspressionen af ​​gener. I de seneste år har siRNAs blevet udviklet som en ny generation af biodrugs der viser terapeutisk potentiale for fremtidig anvendelse i kliniske anvendelser 1-5. Men en vellykket gennemførelse af siRNA terapi er stadig en stor udfordring, som følge af nedbrydning af nukleaser, dårlig intracellulær optagelse, lav transfektionseffektivitet og ineffektiv frigørelse fra endosomet / lysosomet 5. Mange af disse forhindringer kan overvindes ved at udvikle platforme, som sikkert og effektivt kan levere siRNA til sygt væv. Sammenlignet med virale bærere, ikke-virale platforme giver flere fordele, såsom sikkerhed, lave omkostninger og nem skræddersy. Især kationiske nanopartikler, såsom polymerer og lipider, har vist sig nyttigt for siRNA levering 3. Tidligere har vi udviklet et skiveformet drUG leveringssystem, betegnet flertrins vektor (MSV). Denne platform er baseret på sekventielle trin, hvor et køretøj er frigivet fra en anden. Det første trin køretøj er en mikropartikel fremstillet af biologisk nedbrydeligt porøst silicium (PSI), mens den anden fase køretøjer er nanopartikler fyldt med medicin eller kontrastmidler 6,7. De nanopartikler, der er indlejret i PSI materiale, efterhånden udgivet som Si nedbryder 8. En fordel ved at bruge Si-partikler er, at morfologien og overfladeegenskaber let kan skræddersys til at opnå optimal biodistribution og lægemiddelfrigivelse. For nylig blev den vellykkede brug af MSV platform for levering af siRNA liposomer til tumorvæv vist i en æggestokkene og brystkræft musemodel 9, 10. I dette arbejde har vi fabrikeret et universelt system for siRNA levering baseret på principper fra MSV-platformen. Effekten af ​​dette afgivelsessystem er tidligere påvist osing forskellige siRNA molekyler 11. Systemet er en polykation-funktionaliseret porøst silicium (PCPS) bærer, der består af psi podet med polyethylenimin (PEI) og arginin (Arg). PEI kan hjælpe ved dannelse af elektrostatiske interaktioner med siRNA, mens Arg og psi kan tjene til at reducere toksiciteten af PEI, som tidligere demonstarted 11. Desuden kan tilstedeværelsen af ​​PEI bistå i intracellulær optagelse og endosomale undslippe, mens PSI mikropartikler muliggøre siRNA beskyttelse og langvarig frigivelse. PSI partikler gradvist nedbrydes under fysiologiske betingelser, hvilket resulterer i dannelsen af Arg-PEI / siRNA nanopartikler (figur 1), som har en særskilt morfologi og en snæver størrelsesfordeling 11. For oplysninger om stabiliteten af PCPS / siRNA-system, henvises til den undersøgelse, som Shen et al. 11. Denne PCPS platform adskiller sig fra den konventionelle MSV, da den anden fase nanopartikler ikke i første omgang present i bæreren, men er dannet over tid som den første fase bærer nedbryder 11, 12. Den siRNA belastningseffektivitet, cytotoksicitet og gendæmpning effektivitet PCPS systemet er blevet evalueret in vitro. Transfektionseffektiviteten blev målt ved hjælp af siRNA mod ataksi telangiectasia muterede (ATM) onkogen, som er involveret i DNA-reparation 10. Tidligere har undertrykkelse af ATM blevet vist at mindske tumorvækst i en brystkræft model 10.

<table border="0" cellpadding="0" cellspacing="0" width="1812">
	<tbody>
		<tr height="55">
			<td height="55" style="height:55px;width:605px;">Name of the Material/Equipment</td>
			<td style="width:421px;">Company/Institution</td>
			<td style="width:133px;">Catalog Number</td>
			<td style="width:653px;">Comments/Description</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Polyethylenimine (PEI), branched</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">408727</td>
			<td style="width:653px;">Average molecular weight ~25,000 Da</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">L-Arginine</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">A5006</td>
			<td style="width:653px;">Reagent grade, &#8805;98%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Boc-Asp-OH</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">408-468</td>
			<td style="width:653px;">99%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">(3-&#8203;Aminopropyl)&#8203;triethoxysilane</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">440140</td>
			<td style="width:653px;">99%</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Hydrogen peroxide solution</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">216763</td>
			<td style="width:653px;">30&#160;wt. % in H2O</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Sulfuric acid</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">339741</td>
			<td style="width:653px;">100.00%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Isopropyl alcohol</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">W292907</td>
			<td style="width:653px;">&#8805;99.7%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Ethanol</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">459844</td>
			<td>&#8805;99.5%&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">N-(3-Dimethylaminopropyl)-N&#8242;-ethylcarbodiimide hydrochloride (EDC)</td>
			<td>Sigma-Aldrich</td>
			<td>03449</td>
			<td>&#8805;99%</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Albumin from bovine serum</td>
			<td>Sigma-Aldrich</td>
			<td>A7030-10G</td>
			<td>Blocking agent</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Ataxia-telangiectasia mutated siRNA&#160;</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;"></td>
			<td style="width:653px;">Designed in-house</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Tris Acetate-EDTA buffer</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">T9650</td>
			<td style="width:653px;">For DNA agarose gel electrophoresis</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Penicillin-Streptomycin</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td>P4333</td>
			<td style="width:653px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Fetal Bovine Serum</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td>F2442</td>
			<td style="width:653px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">TWEEN 20</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td>P1379</td>
			<td style="width:653px;">Polyethylene glycol sorbitan monolaurate</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">2-Mercaptoethanol</td>
			<td style="width:421px;">Sigma Aldrich</td>
			<td>M6250</td>
			<td style="width:653px;">For Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Sodium dodecyl sulfate</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td>L3771</td>
			<td style="width:653px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Sodium phosphate monobasic</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td>71496</td>
			<td style="width:653px;">For making phosphate buffer&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Sodium phosphate dibasic</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td>71640</td>
			<td style="width:653px;">For making phosphate buffer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Anti-Mouse IgG</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">A4416</td>
			<td style="width:653px;">Secondary antibody (anti-mouse) for Western blot</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">N-Hydroxysuccinimide (NHS)</td>
			<td style="width:421px;">Sigma-Aldrich</td>
			<td style="width:133px;">130672</td>
			<td style="width:653px;">98%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">CELLSTAR 96W Microplate Tissue Culture Treated Clear w/ Lid</td>
			<td style="width:421px;">Greiner Bio-One</td>
			<td style="width:133px;">655182</td>
			<td style="width:653px;">96-well plate</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">10X Tris-Glycine Liquid</td>
			<td style="width:421px;">Li-Cor&#160;</td>
			<td style="width:133px;">928-40010</td>
			<td style="width:653px;">Transfer buffer for Western blot</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Paraformaldehyde solution 4% in PBS&#160;</td>
			<td style="width:421px;">Santa Cruz</td>
			<td>Sc-281692</td>
			<td style="width:653px;">Fixation of cells</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;">CellTiter 96 AQueous Non-Radioactive Cell Proliferation Assay (MTS)</td>
			<td style="width:421px;">Promega</td>
			<td style="width:133px;">G5421</td>
			<td style="width:653px;">Proliferation assay</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Phosphate buffered saline</td>
			<td style="width:421px;">Fisher Scientific</td>
			<td style="width:133px;">BP399-500</td>
			<td style="width:653px;">10 X Solution</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Corning cellgro Dulbecco&#39;s Modification of Eagle&#39;s (Mod.)</td>
			<td style="width:421px;">Fisher Scientific&#160;</td>
			<td style="width:133px;">MT-15-017-CM</td>
			<td style="width:653px;">Cell culture media, 1X solution</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Triton X-100</td>
			<td style="width:421px;">Fisher Scientific</td>
			<td>AC21568-2500</td>
			<td style="width:653px;">Octyl phenol ethoxylate, permeabilization agent</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Cover glass</td>
			<td style="width:421px;">Fisher Scientific</td>
			<td>12-530C&#160;</td>
			<td style="width:653px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Methanol</td>
			<td style="width:421px;">Fisher Scientific&#160;</td>
			<td>A412-1</td>
			<td style="width:653px;">For Western blot transfer buffer</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Plastic Cuvettes</td>
			<td style="width:421px;">Fisher Scientific&#160;</td>
			<td style="width:133px;">14-377-010&#160;</td>
			<td style="width:653px;">For size measurements using Zetasizer Nano ZS</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Molecular BioProducts RNase AWAY Surface Decontaminant</td>
			<td style="width:421px;">Fisher Scientific</td>
			<td style="width:133px;">14-754-34</td>
			<td style="width:653px;">Spray for removing RNAse contamination</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Agarose</td>
			<td style="width:421px;">Fisher Scientific</td>
			<td style="width:133px;">BP165-25</td>
			<td style="width:653px;">Low melting point, for running RNA samples</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">ProLong Gold Antifade Reagent with DAPI&#160;</td>
			<td style="width:421px;">Invitrogen</td>
			<td>P36935</td>
			<td style="width:653px;">Antifade reagent with DAPI, nucelus detection</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Alexa Fluor 488 Phalloidin</td>
			<td style="width:421px;">Invitrogen</td>
			<td style="width:133px;">A12379</td>
			<td style="width:653px;">Dissolve 300 units in 1.5 ml methanol, detection of filamentous actin</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">SYBR Safe DNA Gel Stain</td>
			<td style="width:421px;">Invitrogen</td>
			<td style="width:133px;">S33102</td>
			<td style="width:653px;">Visualization of RNA</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Negative Control siRNA</td>
			<td style="width:421px;">Qiagen</td>
			<td style="width:133px;">1022076</td>
			<td style="width:653px;">Control siRNA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">AllStars Neg. siRNA AF 555</td>
			<td style="width:421px;">Qiagen</td>
			<td style="width:133px;">1027294</td>
			<td style="width:653px;">Fluorescent control siRNA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Cell scraper</td>
			<td style="width:421px;">Celltreat</td>
			<td>229310</td>
			<td style="width:653px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">BioLite Multidishes and Microwell Plates</td>
			<td style="width:421px;">Thermo Scientific</td>
			<td>130184</td>
			<td style="width:653px;">6-well plate</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Pierce LDS Sample Loading Buffer (4X)&#160;</td>
			<td style="width:421px;">Thermo Scientific</td>
			<td>84788</td>
			<td style="width:653px;">Sample loading buffer for Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Pierce BCS Protein Assay Kit</td>
			<td style="width:421px;">Thermo Scientific</td>
			<td style="width:133px;">23227</td>
			<td style="width:653px;">Protein quantification assay</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Halt Protease Inhibitor Single-Use Cocktails (100X)</td>
			<td style="width:421px;">Thermo Scientific</td>
			<td style="width:133px;">78430</td>
			<td style="width:653px;">Protease inhibitor cocktail, use at 1X</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">M-PER Mammalian Protein Extraction Reagent</td>
			<td style="width:421px;">Thermo Scientific&#160;</td>
			<td style="width:133px;">78501</td>
			<td style="width:653px;">Protein extraction reagent</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Sorvall Legend Micro 21R</td>
			<td>Thermo Scientific</td>
			<td>75002440</td>
			<td>Centrifuge</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Beta Actin Antibody&#160;</td>
			<td>Thermo Scientific&#160;</td>
			<td>MA1-91399</td>
			<td>&#946;-actin primary antibody (from mouse) for western blor</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">6X TriTrack DNA Loading Dye</td>
			<td style="width:421px;">Thermo Scientific</td>
			<td>R1161</td>
			<td style="width:653px;">DNA loading dye</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Nuclease-Free Water&#160;</td>
			<td style="width:421px;">Life Technologies</td>
			<td>AM9938</td>
			<td style="width:653px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Non-Fat Dry Milk</td>
			<td style="width:421px;">Lab Scientific</td>
			<td>M0841</td>
			<td style="width:653px;">For Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">2-well BD Falcon culture slides&#160;</td>
			<td style="width:421px;">BD Biosciences</td>
			<td>354102</td>
			<td style="width:653px;">2-well culture slides</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Amersham ECL Western blot detection reagent.&#160;</td>
			<td style="width:421px;">GE Healthcare Life Sciences</td>
			<td style="width:133px;">RPN2106</td>
			<td style="width:653px;">Western blot detection reagent</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">BA Membranes</td>
			<td style="width:421px;">GE Healthcare Life Sciences</td>
			<td>10402096</td>
			<td style="width:653px;">Nitrocellulose membrane for Wester blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">ATM (D2E2) Rabbit mAb</td>
			<td style="width:421px;">Cell Signaling</td>
			<td>2873S</td>
			<td style="width:653px;">ATM primary antibody (from rabbit) for Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Anti-rabbit IgG, HRP-linked Antibody</td>
			<td style="width:421px;">Cell Signaling&#160;</td>
			<td>7074</td>
			<td style="width:653px;">Secondary antibody (anti-rabbit) for Western blot&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Folded capillary cells</td>
			<td style="width:421px;">Malvern&#160;</td>
			<td style="width:133px;">DTS 1061</td>
			<td style="width:653px;">For zeta potentail measurements using Zetasizer Nano ZS</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">MDA-MB-231 cell line</td>
			<td style="width:421px;">ATCC</td>
			<td style="width:133px;">HTB-26</td>
			<td style="width:653px;">Mammary Gland/Breast</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">12% Mini-PROTEAN TGX Gel</td>
			<td>Bio-rad</td>
			<td>456-1043&#160;</td>
			<td style="width:653px;">For Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Biorad PowerPac HC</td>
			<td>Bio-rad</td>
			<td>164-5052</td>
			<td>Power supply for electrophoresis</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">10x Tris/Glycine/SDS Buffer</td>
			<td>Bio-rad</td>
			<td>161-0732</td>
			<td>Running buffer for Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Wide Mini-Sub Cell GT Cell</td>
			<td>Bio-rad</td>
			<td>170-4405</td>
			<td>Electrophoresis equipment for DNA agarose gel&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mini-PROTEAN Tetra cell</td>
			<td>Bio-rad</td>
			<td>165-8000</td>
			<td>Electrophoresis equipment for Western blot</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">ChemiDoc XRS+ System with Image Lab Software</td>
			<td>Bio-rad</td>
			<td>170-8265</td>
			<td>Image acquisition and analysis software for gels and blots</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">4&#34; (10cm) dia., 5x7mm diced Silicon Wafer</td>
			<td>Ted Pella&#160;</td>
			<td>16007</td>
			<td>Silicon waferfor scanning electron microscopy and atomic force microscopy</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Thermomixer R</td>
			<td>Eppendorf</td>
			<td>22670107</td>
			<td>Shaker&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Isoton II diluent</td>
			<td>Beckman Coulter</td>
			<td>8546719</td>
			<td>Isoton diluent</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Multisizer 4 Coulter Counter</td>
			<td>Beckman Coulter</td>
			<td>A63076</td>
			<td>Particle counting analyzer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Non-functionalized porous silicon particles&#160;</td>
			<td style="width:421px;">Microelectronics Research Center, University of Texas at Austin</td>
			<td style="width:133px;"></td>
			<td style="width:653px;">Dicoidal shape. 2.6 &#956;m (diameter) x 0.7 &#956;m (hight), provided in isopropyl alcohol</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Zetasizer Nano ZS</td>
			<td style="width:421px;">Malvern</td>
			<td style="width:133px;"></td>
			<td style="width:653px;">Particle analyzer system for size and zeta potential&#160;</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Scanning Electron Microscope</td>
			<td style="width:421px;">FEI</td>
			<td style="width:133px;"></td>
			<td style="width:653px;">Particle size and shape&#160;</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:605px;">Atomic Force Microscope</td>
			<td style="width:421px;">Bruker</td>
			<td style="width:133px;"></td>
			<td style="width:653px;">Particle size and shape</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:605px;">Fluo ViewTM 1000 Confocal Microscope</td>
			<td style="width:421px;">Olympus</td>
			<td style="width:133px;"></td>
			<td style="width:653px;">Visualization of fixed and live cells</td>
		</tr>
	</tbody>
</table>

porous silicon microparticles for delivery of sirna therapeutics

Small interfering RNA (siRNA) can be used to suppress gene expression, thereby providing a new avenue for the treatment of various diseases. However, the successful implementation of siRNA therapy requires the use of delivery platforms that can overcome the major challenges of siRNA delivery, such as enzymatic degradation, low intracellular uptake and lysosomal entrapment. Here, a protocol for the preparation and use of a biocompatible and effective siRNA delivery system is presented. This platform consists of polyethylenimine (PEI) and arginine (Arg)-grafted porous silicon microparticles, which can be loaded with siRNA by performing a simple mixing step. The silicon particles are gradually degraded over time, thereby triggering the formation of Arg-PEI/siRNA nanoparticles. This delivery vehicle provides a means for protecting and internalizing siRNA, without causing cytotoxicity. The major steps of polycation functionalization, particle characterization, and siRNA loading are outlined in detail. In addition, the procedures for determining particle uptake, cytotoxicity, and transfection efficacy are also described.

Denne protokol beskriver anvendelsen af ​​et ikke-viralt afgivelsessystem til sikker og effektiv siRNA transfektion. SEM resultater viser, at PCPS partiklerne er cylindrisk i form og har en diameter på 2,6 um (figur 2A). Partiklerne er positivt ladede med en zetapotentiale på ca. 8,21 (figur 2B), hvorved elektrostatisk binding med negativt ladede nukleotider. Konfokale billeder af forskellige lag af PCPS partikler viser, at fluorescerende kontrol siRNA er lagt inde i porøst silic...

Watch this Scientific Journal Video about Porous Silicon Microparticles for Delivery of siRNA Therapeutics at JoVE.com

Porous Silicon Microparticles for Delivery of siRNA Therapeutics

Levering er stadig den største udfordring for den terapeutiske gennemførelse af små interfererende RNA (siRNA). Denne protokol indebærer anvendelse af en multifunktionel og biokompatibel siRNA levering platform bestående af arginin og polyethylenimin podet porøst silicium mikropartikler.

Porøst silicium mikropartikler til levering af siRNA Therapeutics

Small interfering RNA (siRNA) can be used to suppress gene expression, thereby providing a new avenue for the treatment of various diseases. However, the ...

Research

JoVE Journal

Bioengineering

Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium

Blød Litografiske funktionalisering og mønster oxydfri silicium og germanium

The development of hybrid electronic devices relies in large part on the integration of (bio)organic materials and inorganic semiconductors through a ...

Self-reporting Scaffolds for 3-Dimensional Cell Culture

Selvrapportering Stilladser for 3-Dimensional Cell Culture

Culturing cells in 3D on appropriate scaffolds is thought to better mimic the in vivo microenvironment and increase cell-cell interactions. The resulting ...

Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors

Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors

Optisk påvisning af<em&gt; E. coli</em&gt; bakterier ved Mesoporøse Silicon biosensorer

A label-free optical biosensor based on a nanostructured porous Si is designed for rapid capture and detection of Escherichia coli K12 bacteria, as a ...

Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications

Udarbejdelse af Silicon nanotrådene Field-effekt Transistor for Kemiske og biosensorer Applications

Surveillance using biomarkers is critical for the early detection, rapid intervention, and reduction in the incidence of diseases. In this study, we ...

Synthesis of Thermogelling Poly(N-isopropylacrylamide)-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering

Synthesis of Thermogelling PolyN-isopropylacrylamide-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering

Syntese af termogelerende Poly (N-isopropylacrylamid) X-graft-chondroitinsulfat Composites med alginatmikropartikler for Tissue Engineering

Injectable biomaterials are defined as implantable materials that can be introduced into the body as a liquid and solidify in situ. Such materials offer ...

Delivery of Therapeutic siRNA to the CNS Using Cationic and Anionic Liposomes

Levering af terapeutisk siRNA til CNS Brug kationiske og anioniske liposomer

Prion diseases result from the misfolding of the normal, cellular prion protein (PrPC) to an abnormal protease resistant isomer called PrPRes.  The ...

Designing Porous Silicon Films as Carriers of Nerve Growth Factor

Designe porøs silicium film som bærere af Nerve vækst faktor

Despite the great potential of NGF for treating neurodegenerative diseases, its therapeutic administration represents a significant challenge as the ...

3D Printed Porous Cellulose Nanocomposite Hydrogel Scaffolds

3D trykt porøse Cellulose Nanocomposite Hydrogel stilladser

This work demonstrates the use of three-dimensional (3D) printing to produce porous cubic scaffolds using cellulose nanocomposite hydrogel ink, with ...

Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery

Fremstilling af Neutrally-ladede, pH-Responsive polymere nanopartikler til Cytosolic siRNA-levering

The success of siRNA as a targeted molecular medicine is dependent upon its efficient cytosolic delivery to cells within the tissue of pathology. Clinical ...