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Introduction

Protocol

Representative Results

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Acknowledgements

Materials

References

Bioengineering

La fabricación de cristal invertida coloidal poli (etilenglicol) Andamios: Una célula Plataforma de cultivo tridimensional para ingeniería de tejidos de hígado

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.

La capacidad para mantener la función de los hepatocitos in vitro, para el propósito de probar la citotoxicidad xenobióticos ', el estudio de la infección por virus y el desarrollo de fármacos dirigidos en el hígado, requiere una plataforma en la que las células reciben señales bioquímicas y mecánicas adecuadas. sistemas recientes de ingeniería de tejidos de hígado han empleado andamios tridimensionales (3D) compuestas de hidrogeles sintéticos o naturales, dado su alta retención de agua y su capacidad de proporcionar los estímulos mecánicos necesarios por las células. Ha habido un creciente interés en el andamio invertida cristal coloidal (ICC), un desarrollo reciente, que permite a la organización espacial alta, homotipica e interacción celular heterotıpica, así como la matriz de interacción célula extracelular (ECM). En este documento, se describe un protocolo para fabricar el andamio ICC utilizando poli diacrilato (etilenglicol) (PEGDA) y el método de lixiviación de partículas. En pocas palabras, una celosía está hecho de partículas de microesferas, después de lo cual un pre-de poSe añade solución r, adecuadamente polimeriza, y las partículas se retiran, o lixiviado, usando un disolvente orgánico (por ejemplo, tetrahidrofurano). La disolución de los resultados de celosía en un andamio altamente poroso con tamaños y interconectividades que permiten los medios de comunicación para llegar a las células más fácilmente de poros controlados. Esta estructura única permite a área de superficie alta para que las células se adhieren a, así como fácil la comunicación entre los poros, y la capacidad de recubrir el andamio ICC PEGDA con proteínas también muestra un efecto marcado en el rendimiento de la célula. Se analiza la morfología del esqueleto, así como el hepatocarcinoma celular (Huh-7.5) el comportamiento en términos de viabilidad y la función de explorar el efecto de la estructura de la CPI y revestimientos de ECM. En general, este documento proporciona un protocolo detallado de un andamio emergente que tiene amplias aplicaciones en la ingeniería de tejidos, especialmente la ingeniería de tejidos del hígado.

El hígado es un órgano altamente vascularizado con una multitud de funciones, incluyendo la desintoxicación de la sangre, el metabolismo de xenobióticos, y la producción de proteínas séricas. El tejido del hígado tiene una microestructura tridimensional compleja (3D), que consta de múltiples tipos de células, canalículos biliares, sinusoides, y zonas de diferente composición biomatriz y diferentes concentraciones de oxígeno. Dada esta estructura elaborada, ha sido difícil crear un modelo de hígado adecuado in vitro 1. Sin embargo, hay una creciente demanda de funcional en modelos in vitro de alojamiento hepatocitos humanos como p....

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1. CPI Andamios Fabricación (Figura 1)

  1. Preparar el poliestireno (PS), cercados (diámetro = 6 mm; 8-13 capas de perlas).
    1. Para preparar el molde, cortar las puntas fuera de 0,2 ml tubos de microcentrífuga hervir a prueba al nivel de 40 l. Adherir la parte superior de los tubos de corte de 24 x 60 mm 2 de microscopio de vidrio se desliza la cubierta con pegamento a prueba de agua.
    2. Poner las esferas de PS (diámetro = 140 mM) contenidos dentro de una suspensión de agua en un vial.......

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Los resultados representativos para la caracterización estructural del andamio CPI y la comparación de la eficacia de cada condición del andamio de la CPI en el cultivo de hepatocitos se muestran y explican a continuación. Las condiciones de andamio ICC utilizados en estos resultados son recubrimientos de colágeno de 0 g / ml (desnudo), 20 mg / ml (de colágeno 20), 200 mg / ml (de colágeno 200), y 400 mg / ml (de colágeno 400) y la inicial número de células de siembra-7,5 eh es.......

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Andamios de ingeniería de tejidos están evolucionando rápidamente para proporcionar todas las señales físicas y bioquímicas necesarias para regenerar, mantener o reparar los tejidos para la aplicación de la sustitución de órganos, el estudio de la enfermedad, el desarrollo de fármacos, y muchos otros 57. En la ingeniería de tejidos de hígado, los hepatocitos primarios humanos pierden rápidamente sus funciones metabólicas una vez aislados del cuerpo, creando una gran necesidad de andamios de inge.......

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Los autores desean agradecer el apoyo de una beca de la Fundación de Investigación Nacional (NRF -NRFF2011-01) y el Programa de Investigación Competitiva (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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