Summary
Abstract
Introduction
Protocol
Representative Results
Discussion
Acknowledgements
Materials
References
Bioengineering
该协议演示了使用沿流体流动方向改变几何形状的微流体通道来产生拉伸应变(拉伸)以在3D胶原水凝胶(厚度<250μm)中对齐纤维。由此产生的对齐延伸几毫米,并受拉伸应变率的影响。
排列的胶原I(COL1)纤维引导肿瘤细胞运动,影响内皮细胞形态,控制干细胞分化,是心脏和肌肉骨骼组织的标志。为了研究细胞对 体外排列微环境的反应,已经开发了几种协议来生成具有定义纤维排列的COL1基质,包括磁性,机械,基于细胞和微流体方法。其中,微流体方法提供了先进的功能,例如精确控制流体流动和细胞微环境。然而,用于高级 体外 培养平台生成对齐COL1基质的微流体方法仅限于COL1纤维的薄“垫”(厚度<40μm),其延伸距离小于500μm,不利于3D细胞培养应用。在这里,我们提出了一种协议来制造3D COL1矩阵(厚度为130-250μm),该矩阵具有微流体装置中定义的纤维排列的毫米级区域。该平台提供先进的细胞培养功能,通过直接访问用于细胞培养的微工程基质来模拟结构化组织微环境。
细胞驻留在称为细胞外基质(ECM)的复杂3D纤维网络中,其中大部分由结构蛋白I型胶原蛋白(COL1)组成1,2。ECM的生物物理特性为细胞提供指导线索,作为回应,细胞重塑ECM微结构3,4,5。这些相互的细胞-基质相互作用可以产生排列的COL1纤维结构域6,其促进肿瘤环境中的血管生成和细胞侵袭7,8,9并影响细胞形态10,11,12,极化13和分化14。排列的胶原纤维还可以促进伤口愈合15,在组织发育中起关键作用
Name | Company | Catalog Number | Comments |
(3-Aminopropyl)triethoxysilane, 99% (APTES) | Sigma Aldrich | 440140-100ML | |
20 Gauge IT Series Angled Dispensing Tip | Jensen Global | JG-20-1.0-90 | |
3/16" dia. x 1/16" thick Nickel Plated Magnet | KJ Magnetics | D31 | |
3M (TC) 12X12-6-467MP | DigiKey | 3M9726-ND | |
ACETONE ACS REAGENT ≥99.5% | Signa Aldrich | 179124-4L | |
BD-20AC LABORATORY CORONA TREATER | Electro-Technic Products | 12051A | |
Bovine Serum Albumin (BSA), Fraction V, 98%, Reagent Grade, Alfa Aesar | VWR | AAJ64100-09 | |
Clear cast acrylic sheet | McMaster-Carr | 8560K181 | |
Corning 100 mL Trypsin 10x, 2.5% Trypsin in HBSS [-] calcium, magnesium, phenol red, Porcine Parvovirus Tested | VWR | 45000-666 | |
Countess II Automated Cell Counter | Thermo Fisher Scientific | AMQAX1000 | |
CT-FIRE software | LOCI - University of Wisconsin | ||
EGM-2 Endothelial Cell Growth Medium-2 BulletKit, (CC-3156 & CC-4176), Lonza CC-3162, 500 mL | Lonza | CC-3162 | |
Glutaraldehyde 50% in aqueous solution, Reagent Grade, Packaging=HDPE Bottle, Size=100 mL | VWR | VWRV0875-100ML | |
Graphtec CELITE-50 | Graphtec | CE LITE-50 | |
HEPES (1 M) | Thermo Fisher Scientific | 15-630-080 | |
High-Purity Silicone Rubber .010" Thick, 6" X 8" Sheet, 55A Durometer | McMaster-Carr | 87315K62 | |
Human Umbilical Vein Endothelial cells | Thermo Fisher Scientific | C0035C | |
Invitrogen Trypan Blue Stain (0.4%) | Thermo Fisher Scientific | T10282 | |
Isopropanol | Fisher Scientific | A4154 | |
Laser cutter | Full Spectrum | 20x12 H-series | |
Microfluidics Syringe pump | New Era Syringe Pumps | NE-1002X | |
Microman E Single Channel Pipettor, Gilson, Model M1000E | Gilson | FD10006 | |
Molecular Probes Alexa Fluor 488 Phalloidin | Thermo Fisher Scientific | A12379 | |
Molecular Probes Hoechst 33342, Trihydrochloride, Trihydrate | Thermo Fisher Scientific | H3570 | |
Nutragen Bovine Atelo Collagen | Advanced BioMatrix | 5010-50ML | |
Pbs (10x), pH 7.4 | VWR | 70011044.00 | |
PBS pH 7.4 | Thermo Fisher Scientific | 10010049.00 | |
Phosphate-buffered saline (PBS, 10x), with Triton X-100 | Alfa Aesar | J63521 | |
Replacement carrier sheet for graphtec craft ROBO CC330L-20 | USCUTTER | GRPCARSHTN | |
Restek Norm-Ject Plastic Syringe 1 mL Luer Slip | Restek | 22766.00 | |
Silicon wafer | University wafer | 452 | |
Sodium Hydroxide, ACS, Packaging=Poly Bottle, Size=500 g | VWR | BDH9292-500G | |
Sylgard 184 | VWR | 102092-312 | |
Thermo Scientific Pierce 20x PBS Tween 20 | Thermo Fisher Scientific | 28352.00 |
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