Name: ferromagnetic bare metal stent for endothelial cell capture and retention
Uploaded: 2015-09-18T15:00:00
Description: Watch this Scientific Journal Video about Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention at JoVE.com

The authors thank Tyra Witt, Cheri Mueske, Brant Newman and Dr. Peter J. Psaltis, MBBS, PhD for their valuable contributions. This study was financially supported by European Regional Development Fund &#8211; FNUSA-ICRC (No. CZ.1.05/1.100/02.0123), American Heart Association Scientist Development Grant (AHA #06-35185N), National Institutes of Health (T32HL007111) and The Grainger Innovation Fund &#8211; Grainger Foundation.

Tüm hayvan çalışmaları Mayo Clinic Kurumsal Hayvan Bakım ve Kullanım Komitesi (IACUC) tarafından onaylanmıştır. Bir 2205 Paslanmaz Çelik Stent 1. Tasarımı ve Analizi <ol><li> CAD kullanarak çıplak metal stent Tasarımı <ol><li> Stent payanda kalınlığına eşit et kalınlığına sahip &#39;ekstrüde patron / baz&#39; özelliği seçerek haddelenmiş oyuk bir silindir yapın. </li><li> Haddelenmiş silindir teğet farklı bir skeç düzlemde bir stent desen tasarlayın. ...

<ol>
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W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Coronary+stents:+current+status.">Coronary stents: current status.</a> J Am Coll Cardiol. 56, 1-42 (2010).</li><li>Austin, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drug-eluting+stents+versus+bare-metal+stents+for+off-label+indications:+a+propensity+score-matched+outcome+study.">Drug-eluting stents versus bare-metal stents for off-label indications: a propensity score-matched outcome study.</a> Circ Cardiovasc Interv. 1 (1), 45-52 (2008).</li><li>Polyak, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High+field+gradient+targeting+of+magnetic+nanoparticle-loaded+endothelial+cells+to+the+surfaces+of+steel+stents.">High field gradient targeting of magnetic nanoparticle-loaded endothelial cells to the surfaces of steel stents.</a> P Natl Acad Sci USA. 105 (2), 698-703 (2008).</li><li>Tassiopoulos, A. 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O., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vitro+study+of+ferromagnetic+stents+for+implant+assisted-magnetic+drug+targeting.">In vitro study of ferromagnetic stents for implant assisted-magnetic drug targeting.</a> J Magn Magn Mater. 311 (1), 306-311 (2007).</li><li>Mardinoglu, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Theoretical+modelling+of+physiologically+stretched+vessel+in+magnetisable+stent+assisted+magnetic+drug+targeting+application.">Theoretical modelling of physiologically stretched vessel in magnetisable stent assisted magnetic drug targeting application.</a> J Magn Magn Mater. 323 (3-4), 324-329 (2011).</li><li>Liu, Z. 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Biz çıplak metal stent olarak işlev görebilir ve casus etiketli endotel hücrelerini çekebilecek bir manyetik stent geliştirdi. Manyetik stent kapsayan önceki çalışmalarda, araştırmacılar nedeniyle ferromanyetik stent 5,10-14 olmayışı manyetik malzemelerden yapılmış nikel kaplamalı ticari stent ve bobinler veya kafesleri kullandık. Diğer gruplar da nanoparçacık yüklü endotel hücrelerini 3 hedefleme için piyasada mevcut 304 kalite paslanmaz çelik stent paramanyetik doğa...

Patients implanted with vascular stents manufactured from thrombogenic materials like stainless steel, cobalt chromium, and platinum chromium &#8211; both bare metal stents (BMS) and drug eluting stents (DES) &#8211; need anti-platelet therapy to prevent thrombus formation. BMS heal rapidly, but are subject to late stage restenosis due to incomplete healing. DES require long term anti-platelet therapy due to delayed healing. Anti-platelet therapy administered to avoid thrombosis as a result of incomplete or delayed healing leads to increased bleeding risk and may not be suitable for certain patients1,2. An ideal stent will heal completely and quickly thus avoiding long-term anti-platelet therapy and late stage restenosis. This complete healing can only be achieved if the stent is rapidly coated with a monolayer of endothelial cells after implantation. Coating the stents with biocompatible materials such as gold or other biopolymers has been shown to improve thrombo-resistance, but none of these techniques achieved ideal blood compatibility as may be possible by coating with endothelial cells3,4.
A stent can be coated with endothelial cells post implantation by attracting circulating progenitor cells. This self-seeding technique can be achieved by utilizing ligands and antibodies. But this technique is limited by the low number of circulating endothelial progenitor cells. A promising strategy is to deliver cells directly to the stent immediately following implantation during a short period of blood flow occlusion3,5. This strategy requires a technique for rapidly capturing cells and retaining them on the stent even after restoring blood flow. We have developed a technique in which a magnetic stent is used to attract and retain magnetically-labeled endothelial cells delivered post implantation. To achieve this, a functional BMS with sufficient magnetic properties to capture and retain magnetically-labeled endothelial cells is required6.
In this paper, we discuss the methods for designing, manufacturing, and testing a 2205 stainless steel stent. The stents were designed using CAD and FEA. The manufactured stents were magnetized using a neodymium magnet and the retained magnetic field was measured using a magneto-resistance microsensor probe. We then tested the stents for magnetically-labeled cell capture in a culture dish during our in-vitro experiments. Finally, the stents were tested in-vivo by implanting magnetic and non-magnetic stents in 4 pigs and histologically analyzing the stented arteries.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>2205 Stainless steel</td>
			<td>Carpenter Technology Corporation</td>
			<td>N/A</td>
			<td>Round bar stock material</td>
		</tr>
		<tr>
			<td>Abaqus</td>
			<td>Dassault systems</td>
			<td>N/A</td>
			<td>Software</td>
		</tr>
		<tr>
			<td>Atropine</td>
			<td></td>
			<td></td>
			<td>Prescription drug.</td>
		</tr>
		<tr>
			<td>Clopidogrel</td>
			<td></td>
			<td></td>
			<td>Commercial name: Plavix. Prescription drug.</td>
		</tr>
		<tr>
			<td>CM-DiI</td>
			<td>Life Technologies</td>
			<td>V-22888</td>
			<td>Molecular Probes, Eugene, OR</td>
		</tr>
		<tr>
			<td>Endothelial growth medium-2</td>
			<td>Lonza</td>
			<td>CC-3162</td>
			<td></td>
		</tr>
		<tr>
			<td>Hand Held Crimping tool</td>
			<td>Blockwise engineering</td>
			<td>M1-RMC</td>
			<td></td>
		</tr>
		<tr>
			<td>Hydrochloric acid (HCl)</td>
			<td>Sigma Aldrich</td>
			<td>MFCD00011324</td>
			<td>CAUTION: wear proptective equipment and handle under fume hood</td>
		</tr>
		<tr>
			<td>Isoflurane anesthesia</td>
			<td>Piramal Critical Care, Inc.&#160;</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Isopropyl alcohol</td>
			<td>Sigma Aldrich</td>
			<td>MFCD00011674</td>
			<td></td>
		</tr>
		<tr>
			<td>NdFeB magnet 2&#34; Dia x 1&#34; thick</td>
			<td>Amazing magnets</td>
			<td>D1000P</td>
			<td>Axially magnetized disc magnet with poles on flat faces</td>
		</tr>
		<tr>
			<td>Over-The-Wire trifold balloon</td>
			<td>N/A</td>
			<td>N/A</td>
			<td>Any commercially available OTW trifold balloon can be used</td>
		</tr>
		<tr>
			<td>Phosphate buffered saline</td>
			<td>Life Technologies</td>
			<td>10010-023</td>
			<td>Commonly known as PBS</td>
		</tr>
		<tr>
			<td>Sodium Bicarbonate (NaHCO3)</td>
			<td>Sigma Aldrich</td>
			<td>MFCD00003528</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium pentobarbital</td>
			<td>Zoetis</td>
			<td></td>
			<td>Commercial Name: Sleepaway (26%), FatalPlus, Beuthanasi.&#160; Controlled substance to be ordered only by licensed veternarian</td>
		</tr>
		<tr>
			<td>SolidWorks</td>
			<td>Dassault systems</td>
			<td>N/A</td>
			<td>Software</td>
		</tr>
		<tr>
			<td>SpinTJ-020 micro sensor</td>
			<td>MicroMagneitcs Sensible Solutions</td>
			<td>N/A</td>
			<td>Long probe STJ-020 microsensor</td>
		</tr>
		<tr>
			<td>SPION</td>
			<td>Mayo Clinic</td>
			<td>N/A</td>
			<td>Nanoparticles synthesized internally (Ref: Lee, S. J. et al. Nanoparticles of magnetic ferric oxides encapsulated with poly(D,L latide-co-glycolide) and their applications to magnetic resonance imaging contrast agent. J Magn Magn Mater 272, 2432-2433, doi:DOI 10.1016/j.jmmm.2003.12.416 (2004))</td>
		</tr>
		<tr>
			<td>Telazol</td>
			<td>Zoetis</td>
			<td></td>
			<td>Controlled substance to be ordered only by licensed veternarian</td>
		</tr>
		<tr>
			<td>Trypsin EDTA</td>
			<td>Life Technologies</td>
			<td>25200-056</td>
			<td>Gibco, Grand Island, NY</td>
		</tr>
		<tr>
			<td>Xylazine</td>
			<td>Bayer Animal Health</td>
			<td></td>
			<td>Commercial name: Rompun. Controlled sunstance to be ordered only by a licensed veternarian</td>
		</tr>
	</tbody>
</table>

ferromagnetic bare metal stent for endothelial cell capture and retention

Kardiyovasküler stentlerin hızlı endotelizasyonunun stent trombozu azaltmak ve kanama riskini azaltabilir, anti-trombosit tedavisi önlemek için gereklidir. Süper paramanyetik demir oksit nanopartiküller (casus) ile işaretlenmiş endotel hücreleri akıbet (EOC) yakalamak ve korumak için manyetik kuvvetler kullanarak fizibilite önceden gösterilmiştir. Ancak bu teknik, hızlı endotelizasyon kanıtlamak için in vitro ve in vivo test ardından manyetik ve biyo-uyumlu bir malzemeden, mekanik olarak işlevsel bir stent geliştirilmesini gerektirmektedir. Biz bilgisayar destekli tasarım (CAD) kullanarak 2205 dubleks paslanmaz çelikten zayıf ferromanyetik stent geliştirdi ve tasarımı daha da sonlu elemanlar analizi (FEA) kullanılarak rafine edilmiştir. Stentin nihai tasarım, mekanik kıvırma ve genişleme sırasında malzemenin kırılma sınırının altında bir ana zorlanma sergiledi. Yüz stent imal edildi ve bunların bir alt kümesi mekanik test, ret kullanılmıştırained manyetik alan ölçümleri, in-vitro hücre yakalama çalışmaları ve in vivo implantasyon çalışmaları. On stent onlar arızasız döngüsünü sıkma ve genişleme sürdürülebilir olmadığını doğrulamak için dağıtım için test edildi. Başka bir 10 stentler, güçlü bir neodimyum mıknatıs kullanarak mıknatıslanmamış ve bunların muhafaza manyetik alan ölçüldü. Stentler muhafaza manyetizma eden in vitro çalışmalarda spion etiketli EOC yakalamak için yeterli olduğunu göstermiştir. Spion etiketli EOC yakalama ve tutma 1 manyetize stent ve 4 domuz her 1 olmayan manyetize edilmiş kontrol stent implante büyük hayvan modellerinde doğrulanmıştır. Stentli arterler 7 gün sonra eksplante ve histolojik olarak incelendi. Bu çalışmada geliştirilen zayıf manyetik stentler çeken ve hızlı iyileşmeyi teşvik edebilir spion etiketli endotel hücrelerini tutabilen idi.

<html> FEA (Şekil 1) dayalı iteratif stent tasarımı kıvrım ve% 30 nihai gerginlik daha azdır% 20 anapara zorlanma ile genişletebilirsiniz stent gösterdi. Sıkma ve genişleme testi (Şekil 2) kırık bulgusuna rastlanmadı. Deforme stentin Resimleri FEA hesaplanan deformasyonlar iyi anlaşmayı gösterdi ve aynı zamanda mikroskopi resimler hiçbir kırıklarına (Şekil 3) gösterdi. Muhafaza manyetik alan ölçümleri (Şekil 4 ve 5) beklendi?...

Watch this Scientific Journal Video about Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention at JoVE.com

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention

Hedeflerimiz, tasarlamak, üretmek ve endotel hücre yakalama için ferromanyetik stent test edildi. On stent kırığı için test edildi ve 10 daha fazla stent muhafaza manyetik için test edildi. Nihayet, 10 stent in vitro test edildi ve 8 daha stent hücre yakalama ve tutma göstermek için 4 domuzlarda implante edildi.

Endotel Hücre yakalama ve Saklanmasına İlişkin ferromanyetik Bare Metal Stent

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Biyomedikal Uygulamalar için Mekanik ayarlanabilir ve Biyoaktif Metal iskelelerinin Fabrikasyon

Biometal systems have been widely used for biomedical applications, in particular, as load-bearing materials. However, major challenges are high stiffness ...

Co-transplantation of Human Ovarian Tissue with Engineered Endothelial Cells: A Cell-based Strategy Combining Accelerated Perfusion with Direct Paracrine Delivery

İnsan yumurtalık dokusu mühendislik endotel hücreleri ile ortak nakli: bir hücre tabanlı strateji birleştirerek perfüzyon doğrudan parakrin teslim ile hızlandırılmış

Infertility is a frequent side effect of chemotherapy and/or radiotherapy and for some patients, cryopreservation of oocytes or embryos is not an option. ...

Immobilization of Live Caenorhabditis elegans Individuals Using an Ultra-thin Polydimethylsiloxane Microfluidic Chip with Water Retention

Immobilization of Live Caenorhabditis elegans Individuals Using an Ultra-thin Polydimethylsiloxane Microfluidic Chip with Water Retention

Bir Ultra-thin Polydimethylsiloxane mikrosıvısal çip su tutma ile kullanarak canlı Caenorhabditis elegans bireylerin immobilizasyon

Radiation is widely used for biological applications and for ion-beam breeding, and among these methods, microbeam irradiation represents a powerful means ...

Growth of Human and Sheep Corneal Endothelial Cell Layers on Biomaterial Membranes

Biyomalzeme Membranlar Üzerinde İnsan ve Koyun Korneal Endotel Hücre Tabakalarının Büyümesi

Corneal endothelial cell cultures have a tendency to undergo epithelial-to-mesenchymal transition (EMT) after loss of cell-to-cell contact. EMT is ...

Mitigation of Blood Borne Cell Attachment to Metal Implants through CD47-Derived Peptide Immobilization

CD47-Türetilmiş Peptid İmmobilizasyonu Ile Metal İmplantlara Kan Yoluyla Bulaşan Hücre Bağlılığının Azaltılması

The key complications associated with bare metal stents and drug eluting stents are in-stent restenosis and late stent thrombosis, respectively. Thus, ...

Segmenting Growth of Endothelial Cells in 6-Well Plates on an Orbital Shaker for Mechanobiological Studies

Mechanobiyolojik Çalışmalar için Orbital Çalkalayıcıda Endotel Hücrelerinin 6 Kuyu Plakalarında Parçalanması

Shear stress imposed on the arterial wall by the flow of blood affects endothelial cell morphology and function. Low magnitude, oscillatory and ...

A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation

Enflamasyon Sırasında Lökosit-Endotelyal Hücre Etkileşimini İnceleyen Mikrofizyolojik Bir Sistem

Leukocyte-endothelial cell interactions play an important role in inflammatory diseases such as sepsis. During inflammation, excessive migration of ...