Name: preparation of thermoresponsive nanostructured surfaces for tissue engineering
Uploaded: 2016-03-01T14:00:00
Description: Watch this Scientific Journal Video about Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering at JoVE.com

This study was financially supported by the Creation of Innovation Centers for Advanced Interdisciplinary Research Program's Project for Developing Innovation Systems "Cell Sheet Tissue Engineering Center (CSTEC)" of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

1. Synthese van polystyreen blok poly (N -isopropylacrylamide) door twee stappen Reversible Addition-fragmentatie Chain Transfer (VLOT) radicale polymerisatie <ol><li> Ontbinden styreen (153,6 mmol), 4-cyaan-4- (ethylsulfanylthiocarbonyl) sulfanylpentanoic zuur (ECT; 0,2 mmol) en 4,4&#39;-azobis (4-cyanovaleriaanzuur) (ACVA; 0,04 mmol) in 40 ml 1, 4-dioxaan. Bevries de oplossing in vloeibare stikstof onder vacuüm gedurende 15-20 min de reactieve species te verwijderen en geleidelijk ontdooien bij ka...

<ol>
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Een temperatuur reagerende oppervlak werd vervaardigd door de Langmuir-Schaefer-methode, en de oppervlakte-eigenschappen voor celadhesie / onthechting en cellaag herstel werden geoptimaliseerd. Bij gebruik van deze werkwijze voor de vervaardiging van oppervlakken, verschillende stappen zijn kritisch. De moleculaire samenstelling van de St-IPAAm moleculen heeft een groot effect op de oppervlaktestructuur en de stabiliteit van het oppervlak, en daarmee ook op celadhesie en onthechting. Met name dient de St-IPAAm moleculen...

Nanogestructureerde oppervlakken hebben onlangs trok veel aandacht vanwege hun verschillende mogelijke toepassingen, inclusief patronen, celkweek, het schoonmaken en het oppervlak switching. Bijvoorbeeld superhydrofobe oppervlakken geïnspireerd door de nanostructuur van de lotusblad en andere reagerende oppervlakken kunnen reageren op externe stimuli 1-4. De Langmuir film is een van de meest bestudeerde polymeercoating. Een Langmuir film wordt gevormd door het droppen van amfifiele moleculen op een lucht-water-interface 5-8. De film kan vervolgens op een vast oppervlak worden overgedragen door fysische of chemische adsorptie, en de moleculaire conformatie op een stevige ondergrond kan worden gecontroleerd met behulp van verticale en horizontale overdracht methoden 9-12. De dichtheid van de Langmuir film kan nauwkeurig worden geregeld door het comprimeren van de lucht-water grensvlak. Onlangs heeft deze methode ook effectief gebleken voor het vervaardigen van nanometerschaal zee-eiland structures door gebruik amfifiele blokcopolymeren. De nanostructuren worden verondersteld te bestaan ​​uit een kern van hydrofobe segmenten en een schil van hydrofiele segmenten 13-17. Bovendien is het aantal nanostructuren op een oppervlak geregeld door regeling van de oppervlakte per molecuul (A m) van het blokcopolymeer bij het ​​grensvlak. We hebben ons gericht op een originele, unieke scaffold-free tissue engineering aanpak, cellaag techniek, met behulp van een op temperatuur reagerende cultuur oppervlak. De ontwikkelde technologie is toegepast op regeneratieve therapieën voor verschillende organen 18. Een temperatuur reagerende kweekoppervlak werd vervaardigd door enten poly (N -isopropylacrylamide) (PIPAAm), een temperatuur reagerende molecuul op een oppervlak 19-27. PIPAAm en zijn copolymeren vertonen een lagere kritische oplossing temperatuur (LCST) in waterige media bij temperaturen rond de 32 ° C. De cultuur oppervlak vertoonde ook een temperatuur reagerende wisselspanning<html> is tussen hydrofobiciteit en hydrofiliciteit. Bij 37 ° C, werd de PIPAAm-geënte oppervlak hydrofoob en cellen gemakkelijk bevestigd en verspreid over het oppervlak alsook conventionele weefselkweek polystyreen. Wanneer de temperatuur werd verlaagd tot 20 ° C, werd het oppervlak hydrofiel, en cellen spontaan los van het oppervlak. Daarom kon gekweekte confluente cellen op het oppervlak worden geoogst als een intacte blad door de temperatuur te veranderen. Deze cel adhesie en onthechting eigenschappen werden ook weergegeven door een oppervlak vervaardigd door Langmuir film coating voor laboratorium demonstratie 26, 27. Een Langmuir film van blokcopolymeren bestaande uit polystyreen (P (St)) en PIPAAm (St-IPAAm) werd vervaardigd. De Langmuir film met een Bk meter kan horizontaal worden overgedragen aan een hydrofoob gemodificeerde glassubstraat. Bovendien celadhesie aan en onthechting van het voorbereide oppervlak in reactie op temperatuur geëvalueerd. _content &quot;&gt; We beschrijven protocollen voor de productie van een nanogestructureerde Langmuir film samengesteld uit warmte reagerende amfifiele blokcopolymeren op een glazen substraat. Onze werkwijze kan een effectieve fabricatietechniek voor organische nanofilms op verschillende gebieden van oppervlaktekunde en kunnen meer vergemakkelijken effectieve controle van celadhesie en op spontane loslating van het oppervlak.

<table border="0" cellpadding="0" cellspacing="0" width="777">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">N-isopropylacrylamide</td>
			<td style="width:193px;">Kohjin</td>
			<td style="width:119px;"></td>
			<td style="width:167px;">No catalog number</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Azobis(4-cyanovaleric acid)</td>
			<td style="width:193px;">Wako Pure Chemicals</td>
			<td style="width:119px;">016-19332</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Styrene</td>
			<td style="width:193px;">Sigma-Aldrich</td>
			<td style="width:119px;">S4972</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">1,3,5-trioxane</td>
			<td style="width:193px;">Sigma-Aldrich</td>
			<td style="width:119px;">T81108</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">1,4-Dioxane</td>
			<td style="width:193px;">Wako Pure Chemicals</td>
			<td style="width:119px;">045-24491</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">DMEM</td>
			<td style="width:193px;">Sigma&#160;</td>
			<td style="width:119px;">D6429</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">PBS</td>
			<td style="width:193px;">Nakarai</td>
			<td style="width:119px;">11482-15</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Streptomycin</td>
			<td style="width:193px;">GIBCO BRL</td>
			<td style="width:119px;">15140-163</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Penicillin</td>
			<td style="width:193px;">GIBCO BRL</td>
			<td style="width:119px;">15140-122</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Trypsin-EDTA</td>
			<td style="width:193px;">Sigma</td>
			<td style="width:119px;">T4174</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">FBS</td>
			<td style="width:193px;">Japan Bioserum</td>
			<td style="width:119px;">JBS-11501</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:299px;">BAECs</td>
			<td style="width:193px;">Health Science Reserch Resources Bank</td>
			<td style="width:119px;">JCRB0099</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Cover Glasses</td>
			<td style="width:193px;">Matsunami Glass Industry</td>
			<td style="width:119px;">C024501</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">AFM NanoScope V</td>
			<td style="width:193px;">Veeco</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:299px;">1H NMR INOVA 400</td>
			<td style="width:193px;">Varian, Palo Alto</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">ATR/FT-IR NICOLET 6700</td>
			<td style="width:193px;">Thermo Scientific</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">GPC HLC-8320GPC</td>
			<td style="width:193px;">Tosoh</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">TSKgel Super AW2500, AW3000, AW4000</td>
			<td style="width:193px;">Tosoh</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:299px;">Langmuir-Blodgett Deposition Troughs&#160;</td>
			<td style="width:193px;">KSV Instruments</td>
			<td style="width:119px;">KN 2002</td>
			<td>KSV NIWA Midium trough</td>
		</tr>
		<tr height="21">
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preparation of thermoresponsive nanostructured surfaces for tissue engineering

Thermoresponsive poly(N-isopropylacrylamide) (PIPAAm)-immobilized surfaces for controlling cell adhesion and detachment were fabricated by the Langmuir-Schaefer method. Amphiphilic block copolymers composed of polystyrene and PIPAAm (St-IPAAms) were synthesized by reversible addition-fragmentation chain transfer (RAFT) radical polymerization. A chloroform solution of St-IPAAm molecules was gently dropped into a Langmuir-trough apparatus, and both barriers of the apparatus were moved horizontally to compress the film to regulate its density. Then, the St-IPAAm Langmuir film was horizontally transferred onto a hydrophobically modified glass substrate by a surface-fixed device. Atomic force microscopy images clearly revealed nanoscale sea-island structures on the surface. The strength, rate, and quality of cell adhesion and detachment on the prepared surface were modulated by changes in temperature across the lower critical solution temperature range of PIPAAm molecules. In addition, a two-dimensional cell structure (cell sheet) was successfully recovered on the optimized surfaces. These unique PIPAAm surfaces may be useful for controlling the strength of cell adhesion and detachment.

Blok-copolymeren bestaande uit polystyreen en poly (N -isopropylacrylamide) (St-IPAAms) met specifieke moleculaire gewichten werden gesynthetiseerd door RAFT radicaalpolymerisatie. ECT bereid als een ketenoverdrachtsmiddel, zoals beschreven in Moad et al. 28. Twee St-IPAAm moleculen van verschillende PIPAAm ketenlengtes gesynthetiseerd en het verkregen blokpolymeren werden gekarakteriseerd door 1H nucleaire magnetische resonantie (NMR) en gelpermea...

Watch this Scientific Journal Video about Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering at JoVE.com

Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

Nanoscaled sea-island surfaces composed of thermoresponsive block copolymers were fabricated by the Langmuir-Schaefer method for controlling spontaneous cell adhesion and detachment. Both the preparation of the surface and the adhesion and detachment of cells on the surface were visualized.

Voorbereiding van de thermoresponsieve nanogestructureerde oppervlakken voor Tissue Engineering

Thermoresponsive poly(N-isopropylacrylamide) (PIPAAm)-immobilized surfaces for controlling cell adhesion and detachment were fabricated by the ...

Research

JoVE Journal

Bioengineering

Fabrication of Biologically Derived Injectable Materials for Myocardial Tissue Engineering

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This protocol provides methods for the preparation of an injectable extracellular matrix (ECM) gel for myocardial tissue engineering applications.  ...

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Cancer invasion and progression involves a motile cell phenotype, which is under complex regulation by growth factors/cytokines and extracellular matrix ...

Elastomeric PGS Scaffolds in Arterial Tissue Engineering

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Cardiovascular disease is one of the leading cause of mortality in the US and especially, coronary artery disease increases with an aging population and ...

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Electrospinning is a commonly used and versatile method to produce  scaffolds (often biodegradable) for 3D tissue engineering.1, 2, 3 Many tissues in vivo ...

Capillary Force Lithography for Cardiac Tissue Engineering

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Cardiovascular disease remains the leading cause of death worldwide1. Cardiac tissue engineering holds much promise to deliver groundbreaking medical ...

Tissue Engineering of a Human 3D in vitro Tumor Test System

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Cancer is one of the leading causes of death worldwide.  Current therapeutic strategies are predominantly developed in 2D culture  systems, which ...

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Synthetic materials are known to initiate clinical complications such as inflammation, stenosis, and infections when implanted as vascular substitutes. ...

Tissue Engineering by Intrinsic Vascularization in an In Vivo Tissue Engineering Chamber

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Tissue Engineering door Intrinsic Vascularisatie in een<em&gt; In Vivo</em&gt; Tissue Engineering Chamber

In reconstructive surgery, there is a clinical need for an alternative to the current methods of autologous reconstruction which are complex, costly and ...

A Protocol for Decellularizing Mouse Cochleae for Inner Ear Tissue Engineering

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In mammals, mechanosensory hair cells that facilitate hearing lack the ability to regenerate, which has limited treatments for hearing loss. Current ...

Site-Directed Immobilization of Bone Morphogenetic Protein 2 to Solid Surfaces by Click Chemistry

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Different therapeutic strategies for the treatment of non-healing long bone defects have been intensively investigated. Currently used treatments present ...