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Bioengineering

肝組織工学のための三次元細胞培養プラットフォーム:逆コロイド結晶ポリ(エチレングリコール)足場の作製

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.

インビトロでの肝細胞の機能を維持する能力 、生体異物「細胞毒性を試験ウイルス感染を研究し、肝臓での標的薬の開発のために、細胞は、適切な生化学的および機械的な合図を受信するプラットフォームを必要とします。最近の肝組織工学システムは、その高い保水性、細胞によって必要とされる機械的な刺激を提供する能力を与えられた、合成または天然のハイドロゲルからなる三次元(3D)スキャフォールドを採用しています。反転コロイド結晶(ICC)足場、高い空間組織、同型および異細胞の相互作用、ならびに細胞外マトリックス(ECM)の相互作用を可能にする最近の開発、への関心が高まってきました。ここで、我々は、ポリ(エチレングリコール)ジアクリレート(PEGDA)と粒子浸出法を用いてICC足場を製造するためのプロトコルを説明します。簡潔には、格子は、後のプリpolyme微小球粒子から形成されていますRの溶液は適切に重合し、添加し、次いで、粒子を有機溶媒( 例えば、テトラヒドロフラン)を使用して、除去し、または浸出されます。メディアをより簡単に細胞に到達することを可能にする制御された細孔サイズとinterconnectivitiesを有する高度に多孔質足場の格子結果の解散。このユニークな構造は、細胞が同様に簡単に毛穴の間の通信、およびタンパク質とPEGDAのICC足場はまた、電池性能に顕著な効果を示してコートする能力のことを遵守するための高い表面積を可能にします。私たちは、生存能力の点で足場の形態と同様に肝細胞癌細胞(ホ-7.5)行動を分析し、ICCの構造およびECMコーティングの効果を調査するために機能します。全体的に、この論文は、組織工学における幅広い用途を持つ新興足場、特に肝組織工学の詳細なプロトコルを提供します。

肝臓は、血液の解毒、生体異物の代謝、および血清タンパク質の産生を含む多数の機能を有する高度に血管器官です。肝臓組織は、複数の細胞型、毛細胆管、正弦波、及び異なるバイオマトリックス組成物と異なる酸素濃度のゾーンを含む、複雑な3次元(3D)微細構造を有します。この精巧な構造を考えると、 インビトロ 1 における適切な肝臓モデルを作成することは困難でした。しかし、薬物毒性2をテストし、肝臓3に関連する疾患を研究するためのプラットフォームとして、ヒト肝細胞をホスティングしているin vitroモデルにおける機能の需要があります。

現在の肝臓組織工学プラットフォームは、肝臓のパラメータ、セル4の、すなわち共培養、透明帯の生化学的組成の、1を単離し、または数に着目して、肝臓の複雑さを単純化していますリットルの微小環境5、流体力学6,7およびバイオマトリックス8の構成。バイオマトリックスの構成は、このような足場材料、細胞外マトリックス(ECM)タンパク質の組成は、マトリックス剛性だけでなく、足場の設計や構造などのパラメータに分けることができます。曲ヒドロゲルの機械的性質、生物活性、および分解速度の能力を考えると、合成ヒドロゲル、特にポリ(エチレングリコール)....

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1. ICCの足場の作製(図1)

  1. ポリスチレン(PS)格子(;ビーズの8-13層直径= 6 mm)を準備します。
    1. 金型を製造するために、40μlのレベルで0.2ミリリットル沸騰プルーフマイクロ遠心チューブからヒントを遮断します。防水接着剤で24×60 mm 2の顕微鏡カバーガラススリップにカットチューブの上部を接着。
    2. 慎重に水懸濁液をピペット、およびバイアルに70%エタノール?.......

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ICC足場の構造的特徴と肝細胞を培養することで、各ICC足場条件の有効性を比較するための代表的な結果が示され、以下に説明されています。これらの結果に使用されるICC足場条件は、0μgの/ mlの(ベア)のコラーゲンコーティングを20μg/ mlの(コラーゲン20)を200μg/ mlの(コラーゲン200)、及び400μgの/ mlの(コラーゲン400)と初期あります許-7.5細胞播種数は1×10 .......

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組織工学足場は急速にすべての、再生、維持、または薬物を、疾患を研究開発、臓器置換の適用のための組織を修復するために必要な物理的および生化学的手がかり、および他の多くの57を提供するように進化しています。肝組織工学では、初代ヒト肝細胞は急速にエンジニアリング足場と肝機能を維持するための開発プラットフォームのための大きい必要性を作成し、一度本体から.......

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著者らは、国立研究財団フェローシップ(NRF -NRFF2011-01)と競争的研究計画(​​NRF-CRP10-2012-07)からの支援を承認したいと思います。

....

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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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