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Materials

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Bioengineering

Fabrikasjon av invertert Kolloidalt Crystal Poly (etylenglykol) Stillas: En Tredimensjonal Cell Culture plattform for Liver Tissue 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.

Evnen til å opprettholde hepatocytt-funksjon in vitro, for det formål å teste xenobiotika 'cytotoksisitet, studere virusinfeksjon og utvikle medikamenter rettet mot leveren, krever en plattform der cellene får skikkelige biokjemiske og mekaniske signaler. Siste levervev tekniske systemer har ansatt tredimensjonale (3D) stillasene som består av syntetiske eller naturlige hydrogeler, gitt den høye vannretensjon og deres evne til å gi de mekaniske stimuli trengs av cellene. Det har vært en økende interesse for invertert kolloidale krystall (ICC) stillaset, en ny utvikling, noe som gir høy romlig organisering, homotypisk og heterotypic celle interaksjon, samt celle ekstracellulære matriks (ECM) interaksjon. Heri beskriver vi en protokoll for å fremstille ICC stillaset ved hjelp av poly (etylenglykol) diakrylat (PEGDA) og partikkel utvasking metoden. I korthet blir et gitter laget av mikropartikler, hvoretter en pre-polymer materialerr-løsning blir tilsatt, skal polymeriseres, og partiklene blir så fjernet, eller utlutes, ved hjelp av et organisk løsningsmiddel (for eksempel tetrahydrofuran). Oppløsningen av gitter resulterer i en svært porøs stillas med kontrollert porestørrelse og interconnectivities som tillater mediet å nå celler lettere. Denne unike struktur gjør det mulig med høyt overflateareal for cellene å overholde samt enkel forbindelse mellom porene, og evnen til å belegge PEGDA ICC stillas med proteiner viser også en markert effekt på celleytelse. Vi analyserer morfologien av stillaset, samt hepatokarsinom celle (Huh-7,5) oppførsel med hensyn til levedyktighet og funksjon for å utforske virkningen av ICC struktur og ECM belegg. Samlet sett gir dette papiret en detaljert protokoll av en fremvoksende stillaset som har brede programmer i tissue engineering, spesielt leveren tissue engineering.

Leveren er en svært vaskularisert organ med en rekke funksjoner, herunder avgiftning av blod, metabolisme av xenobiotika, og produksjonen av serumproteiner. Levervev har en kompleks tredimensjonal (3D) mikrostruktur, bestående av flere celletyper, galle canaliculi, sinus, og soner med forskjellig BioMatrix sammensetning og forskjellige oksygenkonsentrasjoner. Gitt denne forseggjort struktur, har det vært vanskelig å lage en passende leveren modell in vitro 1. Imidlertid er det et økende behov for funksjonell in vitro-modeller hosting humane hepatocytter som plattformer for testing av legemiddeltoksisitet 2 og studere sykdommer ....

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1. ICC Stillas Fabrication (figur 1)

  1. Klargjør polystyren (PS) innhegninger (diameter = 6 mm; 8-13 lag med perler).
    1. For å forberede formen, kutt tips av fra 0,2 ml koke-bevis mikrosentrifugerør på 40 ul nivå. Følge toppen av cut-rør til 24 x 60 mm 2 mikroskop dekkglass slips med vanntett lim.
    2. Sett PS kuler (diameter = 140 mm) inneholdt i en vann-suspensjonen i et 20 ml hetteglass, forsiktig pipette ut vannet suspensjon, og tilsett 18 ml 70% etanolløsning i hetteglasset. Se.......

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De representative resultater for den strukturelle karakterisering av ICC stillas og sammenligning av hver ICC stillas tilstand effekt ved dyrking hepatocytter er vist og forklart nedenfor. ICC stillasBetingelsene anvendt i disse resultatene er collagen belegg på 0 ug / ml (Bart), 20 ug / ml (Kollagen 20), 200 ug / ml (Kollagen 200) og 400 ug / ml (Kollagen 400) og den innledende Huh-7.5 celle seeding nummer er 1x10 6.

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Tissue engineering stillasene er raskt utvikler seg til å gi alle de fysiske og biokjemiske signaler nødvendig for å regenerere, vedlikeholde eller reparere vev for anvendelse av orgel erstatning, studere sykdom, å utvikle medikamenter, og mange andre 57. I leveren tissue engineering, primære humane hepatocytter raskt miste sine metabolske funksjoner gang isolert fra kroppen, og skaper et stort behov for ingeniører stillaser og utviklingsplattformer for å opprettholde leverfunksjon. Den nåværende

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Forfatterne ønsker å erkjenne støtte fra National Research Foundation Fellowship (NRF -NRFF2011-01) og konkurransedyktig forskning Programme (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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