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Bioengineering

Tillverkning av Inverted kolloidalt Crystal Poly (etylenglykol) Scaffold: En tredimensionell cellkultur plattform för levervävnad Engineering

Published: August 27th, 2016

DOI:

10.3791/54331

1School of Materials Science and Engineering, Nanyang Technological University, 2School of Chemical and Biomedical Engineering, Nanyang Technological University

This manuscript presents a detailed protocol for the fabrication of an emerging three-dimensional hepatocyte culture platform, the inverted colloidal crystal scaffold, and the concomitant techniques to assess hepatocyte behavior. The size-controllable pores, interconnectivity and ability to conjugate extracellular matrix proteins to the poly(ethylene glycol) (PEG) scaffold enhance Huh-7.5 cell performance.

Förmågan att upprätthålla hepatocyte funktion in vitro, i syfte att testa xenobiotika "cytotoxicitet, studera virusinfektion och utveckla läkemedel som riktar sig till levern, kräver en plattform där celler får rätt biokemiska och mekaniska signaler. Senaste levervävnad tekniska system har använt tredimensionella (3D) ställningar bestående av syntetiska eller naturliga hydrogeler, med tanke på deras höga vattenbindande och deras förmåga att ge de mekaniska stimuli som behövs av cellerna. Det har funnits ett växande intresse för den inverterade kolloidalt kristallen (ICC) byggnadsställning, en ny utveckling, vilket möjliggör hög rumslig organisation, homotypisk och hetero cell interaktion, liksom cell extracellulärt matrix (ECM) interaktion. Häri beskriver vi ett protokoll för att tillverka ICC ställningen med användning av poly (etylenglykol) diakrylat (PEGDA) och urlakningspartikelmetoden. Kortfattat är ett gitter tillverkat av mikrosfärpartiklar, varefter en i förväg polymer lösning tillsättes, korrekt polymeriseras, och partiklarna avlägsnas därefter, eller urlakas, med användning av ett organiskt lösningsmedel (t.ex. tetrahydrofuran). Upplösningen av gitterresulterar i en mycket porös scaffold med kontrollerade porstorlekar och interconnectivities som tillåter medier för att nå cellerna lättare. Denna unika struktur tillåter en hög ytarea för cellerna att vidhäfta till samt enkel kommunikation mellan porerna, och möjligheten att belägga PEGDA ICC scaffold med proteiner visar också en markant effekt på cellprestanda. Vi analyserar morfologi ställningen samt hepatokarcinom cellen (Va-7,5) beteende när det gäller lönsamhet och funktion för att undersöka effekten av ICC struktur och ECM beläggningar. Sammantaget ger detta papper ett detaljerat protokoll av en framväxande byggnadsställning som har breda tillämpningar inom tissue engineering, särskilt levervävnadsteknik.

Levern är ett mycket vaskulariserad organ med en mängd funktioner, inklusive avgiftning av blodet, metabolism av xenobiotika, och produktionen av serumproteiner. Levervävnad har en komplex tredimensionell (3D) mikrostruktur, bestående av flera celltyper, gallcanaliculi, sinuskurvor, och zoner med olika biomatris sammansättning och olika syrekoncentrationer. Med tanke på detta noggrant struktur, har det varit svårt att skapa en ordentlig levermodell in vitro en. Det finns dock en ökande efterfrågan på funktionella in vitro-modeller värd humana hepatocyter som plattformar för att testa läkemedelstoxicitet 2 och studera sjukdomar ....

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1. ICC Scaffold Fabrication (figur 1)

  1. Förbered polystyren (PS) gitter (diameter = 6 mm, 8-13 lager av pärlor).
    1. För att förbereda formen, klippa tips bort från 0,2 ml koka säkra mikrocentrifugrör på 40 pl nivå. Vidhäfta toppen av cut-rören till 24 x 60 mm 2 mikroskop täckglas halk med vattentätt lim.
    2. Sätt PS sfärer (diameter = 140 pm) som finns i en vattensuspension i en 20 ml flaska, försiktigt pipett ur vattnet fjädring, och tillsätt 18 ml av 70% etanollösning.......

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De representativa resultat för strukturbestämning av ICC ställningen och jämförelse av varje ICC ställnings tillstånd effektivitet i odling hepatocyter visas och förklaras nedan. ICC ställnings betingelser som användes i dessa resultat är kollagen beläggningar av 0 | ig / ml (Bare), 20 | ig / ml (Kollagen 20), 200 | ig / ml (Kollagen 200), och 400 | ig / ml (Kollagen 400) och den initiala va-7,5 cell sådd antal är 1x10 6.

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Vävnadstekniska byggnadsställningar utvecklas snabbt för att ge alla de fysiska och biokemiska signaler som är nödvändiga för att regenerera, underhålla eller reparera vävnad för tillämpningen av ersättnings organ, studera sjukdomar, utveckling av läkemedel och många andra 57. I levervävnadsteknik, primära humana hepatocyter förlorar snabbt deras metaboliska funktioner när isolerade från kroppen, vilket skapar ett stort behov av tekniska ställningar och utveckla plattformar för att upprä.......

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Författarna vill erkänna stöd från en National Research Foundation Fellowship (NRF -NRFF2011-01) och konkurrenskraftig forskning (NRF-CRP10-2012-07).

....

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NameCompanyCatalog NumberComments
0.2 mL PCR tubeAxygen ScientificPCR-02D-CBoil-proof
Gorilla GlueGorilla Glue, Inc.Depends on vendor. This was purchased from a local store.
Glass slidesVWR 631-1575Dimensions: 24×60 mm
Polystyrene spheres Fisher ScientificTSS#4314ADiameter = 140 um; 3x10^4 particles per milliliter and 1.4% size distribution
EthanolMerck1.00983.1011absolute for analysis EMSURE; Dilute to 70% with Milli-Q water
Ultrasonic BathElmaS10HEquiment
FurnaceNaberthermN7/HEquipment
200 µL pipette tipAxygen ScientificT-210-Y-R-S
Rocking shakerVWR444-0142
Polyethylene Glycol (PEG)Merck1.09727.0100Mw= 4kDa; acrylation of PEG monomers and purification of the resulting precipitate produces a PEGDA macromer with Mw = 4.6kDa
CentrifugeBeckman Coulter392932Equipment
Acrylate-Poly (Ethylene Glycol) - Succinimidyl Valerate Laysan BioACRL-PEG-SVA-3400-1gMw = 3.4 kDa
2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenoneSigma Aldrich410896
VortexVWR58816-123Equipment
MicrocentrifugeEppendorf5404 000.413
Paraffin Film Parafilm M #PM996Kept at 9" with allows intensity of 10.84 mW/cm^2
Bluewave 200 UV spotlightBlaze Technology 120008, 122300
Tetrahydrofuran (THF)Merck107025
Orbital shakerHeidolph543-123120-00-5From rat
Collagen Type ISigma AldrichC3867-1VL1X, w/o CaCl & MgCl; Ph = 7.2
Phosphate Buffered Saline (PBS) Gibco20012-02716% W/V AQ. 10x10ml
ParaformaldehydeVWR43368.9MEquipment
Freezone 4.5 freeze drierLabconco7750020Equipment
Sputter coaterJeol Ltd.JFC-1600Equipment
Scanning Electron MicroscopeJeol Ltd.JSM 5310
Anti-mouse primary antibodies against Collagen type IAbcamab6308
Anti-mouse secondary antibody conjugated with Alexa Fluor 488Life TechnologiesA21121
Plate, Tissue Culture 24 Well, Flat Bottom (Nunclon) Bio-Rev PTE LTD3820-024
Dulbecco's Modified Eagle's Medium(DMEM)
2.5 g/L Glucose w/ L-Gln
Lonza12-604F
Fetal Bovine Serum (FBS)GibcoA15-151
Penicillin-Streptomycin (P/S)Life Tchnologies15140-122 E
APC49‐Huh ‐7.5 Cell LineApath
100 mm Corning non-treated culture dishesSigma AldrichCLS430591
0.25% Trypsin-EDTAGibco25200-056Equipment; 37°C, 5% Humidity
Forma Steri-Cycle CO2 IncubatorsThermofisher Scientific371
Hausser Bright-Line Phase HemacytometerThermofisher Scientific02-671-6
Live/Dead Viability/Cytotoxicity Kit 'for mammalian cellsLife TechnologiesL3224 
CCK-8 AssayDojindo LaboratoriesCK04-11Monosodium-salt reagent (MSR)
Infinite 200 PRO microplate reader Tecan
Albumin Human ELISA kitAbcamab108788
Triton X-100Bio-Rad#1610407
Bovine Serum Albumin (BSA)Sigma-AldrichA2153-50G
Anti-mouse primary antibodies (against CYP3A4, albumin)Santa Cruz Biotechnologysc-53850; sc-271605
DAPILife TechnologiesD3571
Alexa Fluor 555 labelled PhalloidinLife TechnologiesA34055
TrizolLife Technologies15596-026
ChloroformVWR22706.326
IsopropanolFisher Scientific67-63-0
DPEC waterThermofisher ScientificAM9916
Nanodrop 2000c SpectrophotometerThermofisher ScientificND-2000
iScript Reverse Transcription Supermix Bio-Rad Laboratories1708840
SYBR select Master Mix for CFXLife Technology4472937
Primers (to be chosen)
CFX96 Real-Time System, C-1000 Touch Thermal CyclerBio Rad LaboratoriesSOFT-CFX-31-PATCH 

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