• Title/Summary/Keyword: Hybrid scaffold

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BMP-2 Immoblized in BCP-Chitosan-Hyaluronic Acid Hybrid Scaffold for Bone Tissue Engineering

  • Nath, Subrata Deb;Abueva, Celine;Sarkar, Swapan Kumar;Lee, Byong Taek
    • Korean Journal of Materials Research
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    • v.24 no.12
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    • pp.704-709
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    • 2014
  • In this study, we fabricated a novel micro porous hybrid scaffold of biphasic calcium phosphate (BCP) and a polylectrolyte complex (PEC) of chitosan (CS) and hyaluronic acid (HA). The fabrication process included loading of CS-HA PEC in a bare BCP scaffold followed by lypophilization. SEM observation and porosimetry revealed that the scaffold was full of micro and macro pores with total porosity of more than 60 % and pore size in the range of $20{\sim}200{\mu}m$. The composite scaffold was mechanically stronger than the bare BCP scaffold and was significantly stronger than the CS-HA PEC polymer scaffold. Bone morphogenetic growth factor (BMP-2) was immobilized in CS-HA PEC in order to integrate the osteoinductive potentiality required for osteogenesis. The BCP frame, prepared by sponge replica, worked as a physical barrier that prolonged the BMP-2 release significantly. The preliminary biocompatibility data show improved biological performance of the BMP-2 immobilized hybrid scaffold in the presence of rabbit bone marrow stem cells (rBMSC).

EFFECT OF DIFFERENT STERILIZATION METHODS ON THE SURFACE MORPHOLOGY OF PPDO-hybrid-PLGA NANOFIBER SCAFFOLD AND ATTACHMENTS OF PC12 CELL (다양한 소독방법이 PPDO-hybrid-PLGA nanofiber scaffold의 형태와 세포부착에 미치는 영향에 관한 연구)

  • Lee, Ju-Hyon;Min, Hyun-Gi;Jung, Ju-Young;Kang, Na-Ra
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.34 no.6
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    • pp.635-639
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    • 2008
  • Objectives : the effect of different sterilization methods on the surface morphology of PPDO-hybrid-PLGA nanofiber scaffold and attachments of PC12 cell were investigated. Methods : Poly (p-dioxone)-hybrid-Poly (lactide-glycolide) (PPDO-hybrid-PLGA) nanofiber scaffold, fabricated in a tube form with 1.5 mm internal diameter, 0.2 mm thickness and 5 mm length, was prepared using electrospinning method. To study the surface morphology using SEM, The study group and control group in respective were; Control:Non-sterilized scaffold, Group I:scaffold sterilized with 70% Alcohol, Group II: scaffold sterilized with Ethylene Oxide at $65^{\circ}C$, and Group III: scaffold sterilized with Ethylene Oxide at $37^{\circ}C$. To investigate viability of the PC12 cell on the scaffold, The study group and control group in respective were; Control: sterilized with 70% Alcohol, Group I: sterilized with Ethylene Oxide at $65^{\circ}C$, and Group II: sterilized with Ethylene Oxide at $37^{\circ}C$. Results : 1. The surface morphology was slightly changed in Group I, II and Group III, compared with control. 2. The attachment of PC12 cells in Group I, II was not higher than in control Discussion : The attachment of PC12 cell is not influenced by different sterilization methods.

A Study on the Effect of Physical Stimuli on Bone Cell Differentiation Using a Hybrid Bioreactor (Hybrid Bioreactor를 이용한 물리적 자극에 대한 세포반응 연구)

  • 이창양;최귀원;홍대희
    • Journal of Biomedical Engineering Research
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    • v.25 no.4
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    • pp.309-314
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    • 2004
  • in this study, hybrid bioreactor was used to apply physical stimuli in cell culture. Effect of the applied physical stimuli on the growth and differentiation of MC3T3-El cell in a three-dimensional Chitosan scaffold were studied by using the hybrid bioreactor. The hybrid bioreactor for physical stimulus was specially designed to apply uniaxial cyclic compressive and shear strain. Physical stimulus was applied over a period of 14 days with 150 cycles per day at a frequency of 0.5Hz. Strain magnitude was 2.5% of the scaffold size. Control group and physically stimulated group of the MC3T3-El tell were incubated and harvested at the indicated times (Day 6, 8, 10, 12, 14). The total amount of protein, which obtained information of cell growth, was determined by Lowey method. Alkaline phosphatase activity was examined by ELISA. Physically stimulated group using the hybrid bioreactor was increased in alkaline phosphatase activity comparing with control group. The nodule formation and calcium deposit of the physical stimuli group which resulted in cell differentiation was faster than that of control group.

Fabrication and Evaluation of Hybrid Scaffold by Nano-Micro Precision Deposition System (나노-마이크로 정밀 분사 시스템을 이용한 하이브리드 인공지지체의 제작 및 평가)

  • Ha, Seong-Woo;Kim, Jong Young
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.8
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    • pp.875-880
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    • 2014
  • Recently, three-dimensional scaffolds and nanofibers are being developed for bone tissue regeneration. In this study, we fabricated a hybrid scaffold using a nano-micro precision deposition system. The fabrication process involved the application of the solid freeform fabrication (SFF) technology and electrospinning. The hybrid scaffolds were combined using micro scaffolds and nanofibers. The nanofibers were deposited on each layer of the micro scaffolding using the electrospinning process. The micro scaffolds were fabricated using the SFF technology at a temperature of $100^{\circ}C$, pressure of 650 kPa, and scan velocity of 250 mm/s. Nanofiber fabrication was conducted by means of electrospinning using the flow rate, solution concentration, distance from the tip to the collector (TCD), and voltage. The nanofibers were fabricated using a flow rate of 0.1 ml/min, voltage of 5 kV, TCD of 1 mm, and 10 wt% of solution concentration. MG-63 cells were seeded into the hybrid scaffold for the purpose of its evaluation.

Biodisc Tissue-Engineered Using PLGA/DBP Hybrid Scaffold (DBP/PLGA 하이브리드 담체를 이용한 조직공학적 바이오 디스크 개발)

  • Ko, Youn-Kyung;Kim, Soon-Hee;Jeong, Jae-Soo;Ha, Hyun-Jung;Yoon, Sun-Jung;Rhee, John-M.;Kim, Moon-Suk;Lee, Hai-Bang;Khang, Gil-Son
    • Polymer(Korea)
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    • v.31 no.1
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    • pp.14-19
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    • 2007
  • Demineralized bone particle (DBP) has been used as one of the powerful inducers of bone and cartilage tissue specialization. In this study, we fabricated DBP/PLGA scaffold for tissue engineered disc regeneration. We manufactured dual-structured scaffold to compose inner cylinder and outer doughnut similar to nature disc tissue. The DBP/PLGA scaffold was characterized by porosity, wettability, and water uptake ability. We isolated and cultured nucleus pulposus (NP) and annulus fibrosus (AF) cells from rabbit intervertebral disc. We seeded NP cells into the inner core of the hybrid scaffold and AF cells into the outer portion of it. Cellular viability and proliferation were assayed by 3-(4,5-dimethylthiazole-2-yl) -2,5- diphenyltetrazolium -bromide (MTT) test. PLGA and PLGA/DBP scaffolds were implanted in subcutaneous of athymic nude mouse to observe the formation of disc-like tissue in vivo. And then we observed change of morphology and hematoxylin and eosin (H&E). Formation of disc-like tissue was better DBP/PLGA hybrid scaffold than control. Specially, we confirmed that scaffold impregnated 20 and 40% DBP affected to proliferation of disc cell and formation of disc-like tissue.

Fabrication of Nanofiber-Combined 3D Scaffolds using Dual-Head Deposition Technology (듀얼헤드 적층 기술을 이용한 나노섬유로 결합된 3D 인공지지체 제작)

  • Sa, Min-Woo;Lee, Chang-Hee;Kim, Jong Young
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.1
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    • pp.108-115
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    • 2018
  • In bone tissue engineering, polycaprolactone (PCL) is one of the most widely used biomaterials to manufacture scaffolds as a synthetic polymer with biodegradability and biocompatibility. The polymer deposition system (PDS) with four axis heads, which can dispense bio-polymers, has been used in scaffold fabrication for tissue engineering applications. A dual-head deposition technology of PDS is an effective technique to fabricate 3D scaffolds. The electrospinning technology has been widely used to fabricate porous and highly interconnected polymer fibers. Thus, PDS can fabricate nanofiber-combined hybrid scaffolds using fused deposition modeling (FDM) and electrospinning methods. This study aims to fabricate nanofiber-combined scaffolds with uniform nanofibers using PDS. The PCL nanofibers were fabricated and evaluated according to the fabrication process parameters. PCL nanofibers were successfully fabricated when the applied voltage, tip-to-collector distance, flow rate, and solution concentration were 5 kV, 1 cm, 0.1 ml/h, and 8 wt%, respectively. The cell proliferation was evaluated according to the electrospinning time. Scanning electron microscopy was used to acquire images of the cross-sectioned hybrid scaffolds. The cell proliferation test of the PCL and nanofiber-combined hybrid scaffolds was performed using a CCK-8 assay according to the electrospinning time. The result of in-vitro cell proliferation using osteosarcoma MG-63 cells shows that the hybrid scaffold has good potential for bone regeneration.

Fabrication of Nano Composites Using Hybrid Rapid Prototyping (하이브리드 쾌속 조형을 이용한 나노 복합재의 조형)

  • Chu W.S.;Kim S.G.;Ahn S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.757-760
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    • 2005
  • The technology of rapid prototyping (RP) is used for design verification, function test and fabrication of prototype. The current issues in RP are improvement in accuracy and application of various materials. In this paper, a hybrid rapid prototyping system is introduced which can fabricate nano composites using various materials. This hybrid system adopts RP and machining process, so material deposition and removal is performed at the same time in a single station. As examples, micro gears and a composite scaffold were fabricated using photo cured polymer with nano powders such as carbon black and hydroxyapatite. From the micro gear samples the hybrid RP technology showed higher precision than those made by casting or deposition process.

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