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Abstract

Introduction

Protocol

Representative Results

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Acknowledgements

Materials

References

Bioengineering

Fabricação de Inverted coloidal de cristal poli (etileno-glicol) Andaime: Uma Plataforma Cultura celular tridimensional para Liver Engenharia de Tecidos

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.

A capacidade para manter a função de hepatócitos in vitro, com a finalidade de testar a citotoxicidade 'xenobióticos, estudar a infecção por vírus e o desenvolvimento de drogas orientadas para o fígado, exige uma plataforma em que as células recebem sinais bioquímicos e mecânicos adequados. sistemas recentes de engenharia de tecidos do fígado têm empregado tridimensionais andaimes (3D) compostas de hidrogéis sintéticas ou naturais, dada a sua alta capacidade de retenção de água e sua capacidade de fornecer os estímulos mecânicos necessários pelas células. Tem havido um interesse crescente no andaime invertida cristal coloidal (ICC), um desenvolvimento recente, que permite alta organização espacial, homot�ica e interação célula heterotípica, bem como matriz (ECM) interação célula-extracelular. Aqui, nós descrevemos um protocolo para fabricar o andaime ICC usando poli diacrilato (etileno glicol) (PEGDA) eo método de partículas de lixiviação. Resumidamente, uma estrutura é feita a partir de partículas de microsferas, após o qual uma pré-polymesolução R é adicionada, adequadamente polimerizadas, e as partículas são, então, removido, ou lixiviado, utilizando um solvente orgânico (por exemplo, tetra-hidrofurano). A dissolução dos resultados grades de um andaime altamente porosa com tamanhos de poro controlado e interconnectivities que permitem que os meios para a obtenção de células mais facilmente. Esta estrutura única permite que a área de superfície elevada para as células a aderir bem como a comunicação fácil entre poros, e a capacidade para revestir o andaime ICC PEGDA com proteínas também mostra um efeito significativo no desempenho da célula. Analisamos a morfologia do suporte, bem como a célula hepatocarcinoma comportamento (Huh-7,5), em termos de viabilidade e função para explorar o efeito da estrutura ICC e revestimentos de ECM. No geral, este artigo fornece um protocolo detalhado de um andaime emergente que tem larga aplicação em engenharia de tecidos, especialmente no fígado engenharia de tecidos.

O fígado é um órgão altamente vascularizado com uma multiplicidade de funções, incluindo a desintoxicação do sangue, metabolismo de xenobióticos, e a produção de proteínas séricas. O tecido de fígado tem uma microestrutura complexa tridimensional (3D), que compreende de vários tipos de células, canalículos biliares, sinusóides, e zonas de composição biomatriz diferente e diferentes concentrações de oxigénio. Dada esta estrutura elaborada, tem sido difícil criar um modelo de fígado adequada in vitro 1. No entanto, há uma crescente demanda por funcional em modelos in vitro hospedagem hepatócitos humanos como plataformas para ensaio....

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1. ICC andaime Fabrication (Figura 1)

  1. Prepare o poliestireno (PS) reticulados (diâmetro = 6 mm; 8-13 camadas de grânulos).
    1. Para preparar o molde, corte as pontas off de 0,2 ml tubos de microcentrífuga à prova de fervura no nível de 40 mL. Aderir ao topo das cut-tubos de 24 x 60 milímetros 2 microscópio lamelas de vidro com cola à prova de água.
    2. Coloque as esferas PS (diâmetro = 140 um) contidos dentro de uma suspensão de água em um frasco de 20 ml, cuidadosamente pipe.......

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Os resultados representativos para a caracterização estrutural do andaime ICC ea comparação da eficácia de cada condição de andaime ICC em cultura de hepatócitos são mostrados e explicados abaixo. As condições ICC andaime utilizados nestes resultados são revestimentos de colagénio de 0 ug / ml (sem isolamento), 20 ug / ml (colágeno 20), 200 ug / ml (colágeno 200), e 400 ug / ml (colágeno 400) e o inicial huh-7.5 número de semeadura de células é 1x10 6.

<.......

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Andaimes de engenharia de tecidos estão a evoluir rapidamente para fornecer todas as pistas físicas e bioquímicas necessárias para regenerar, manter ou reparar tecidos para a aplicação da substituição de órgãos, estudando a doença, o desenvolvimento de drogas, e muitos outros 57. Na engenharia de tecidos do fígado, os hepatócitos primários humanos rapidamente perdem suas funções metabólicas uma vez isolados do corpo, criando uma grande necessidade de andaimes de engenharia e desenvolvimento d.......

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Os autores gostariam de agradecer o apoio de um Research Foundation Fellowship Nacional (NRF -NRFF2011-01) e Competitiva Programa de Pesquisa (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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