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Open AccessArticle

Hybrid Membranes of PLLA/Collagen for Bone Tissue Engineering: A Comparative Study of Scaffold Production Techniques for Optimal Mechanical Properties and Osteoinduction Ability

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Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
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Faculdade de Medicina, Núcleo de Terapia Celular e Molecular (NUCEL)—Núcleo de Estudos e Terapia Celular e Molecular (NETCEM), Universidade de São Paulo, Rua Pangaré 100, 05360-130 São Paulo, SP, Brazil
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Author to whom correspondence should be addressed.
Academic Editor: Amir A. Zadpoor
Materials 2015, 8(2), 408-423; https://doi.org/10.3390/ma8020408
Received: 10 September 2014 / Revised: 23 December 2014 / Accepted: 19 January 2015 / Published: 26 January 2015
(This article belongs to the Special Issue Mechanics of Biomaterials)
Synthetic and natural polymer association is a promising tool in tissue engineering. The aim of this study was to compare five methodologies for producing hybrid scaffolds for cell culture using poly-l-lactide (PLLA) and collagen: functionalization of PLLA electrospun by (1) dialkylamine and collagen immobilization with glutaraldehyde and by (2) hydrolysis and collagen immobilization with carbodiimide chemistry; (3) co-electrospinning of PLLA/chloroform and collagen/hexafluoropropanol (HFP) solutions; (4) co-electrospinning of PLLA/chloroform and collagen/acetic acid solutions and (5) electrospinning of a co-solution of PLLA and collagen using HFP. These materials were evaluated based on their morphology, mechanical properties, ability to induce cell proliferation and alkaline phosphatase activity upon submission of mesenchymal stem cells to basal or osteoblastic differentiation medium (ODM). Methods (1) and (2) resulted in a decrease in mechanical properties, whereas methods (3), (4) and (5) resulted in materials of higher tensile strength and osteogenic differentiation. Materials yielded by methods (2), (3) and (5) promoted osteoinduction even in the absence of ODM. The results indicate that the scaffold based on the PLLA/collagen blend exhibited optimal mechanical properties and the highest capacity for osteodifferentiation and was the best choice for collagen incorporation into PLLA in bone repair applications. View Full-Text
Keywords: electrospinning; scaffolds; collagen; synthetic polymer electrospinning; scaffolds; collagen; synthetic polymer
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Gonçalves, F.; Bentini, R.; Burrows, M.C.; Carreira, A.C.O.; Kossugue, P.M.; Sogayar, M.C.; Catalani, L.H. Hybrid Membranes of PLLA/Collagen for Bone Tissue Engineering: A Comparative Study of Scaffold Production Techniques for Optimal Mechanical Properties and Osteoinduction Ability. Materials 2015, 8, 408-423.

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