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The fabrication of nano-hydroxyapatite on PLGA and PLGA/collagen nanofibrous composite scaffolds and their effects in osteoblastic behavior for bone tissue engineering.

Abstract：

:Bone is a nanocomposite consisting of two main components, nano-hydroxyapatite (n-HA) and Type I collagen (Col). The aim is to exploit the nano-scale functional and material characteristics of natural bone in order to modulate cellular functions for optimal bone repair in bone graft systems. Here, we present an effective and novel technique in obtaining n-HA in cognate with native apatite on electrospun nanofibers within minutes without any pre-treatment. Using an alternate calcium and phosphate (Ca-P) solution dipping method, n-HA was formed on poly(lactide-co-glycolide) acid (PLGA) and blended PLGA/Col nanofibers. The presence of the functional groups of collagen significantly hastened n-HA deposition closed to nine-fold. The quantity of n-HA impinged upon the specific surface area, whereby mineralized PLGA/Col had a greater surface area than non-mineralized PLGA/Col, whereas n-HA did not significantly improve the specific surface area of mineralized PLGA compared to pure PLGA. The novelty of the process was that n-HA on PLGA had a positive modulation on early osteoblast capture (within minutes) compared to pure PLGA. Contrary, cell capture on mineralized PLGA/Col was comparable to pure PLGA/Col. Interestingly, although n-HA impeded proliferation during the culture period (days 1, 4 and 7), the cell functionality such as alkaline phosphatase (ALP) and protein expressions were ameliorated on mineralized nanofibers. The amount of n-HA appeared to have a greater effect on the early stages of osteoblast behavior (cell attachment and proliferation) rather than the immediate/late stages (proliferation and differentiation).

journal_name

Bone

journal_title

Bone

authors

Ngiam M,Liao S,Patil AJ,Cheng Z,Chan CK,Ramakrishna S

doi

10.1016/j.bone.2009.03.674

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

4-16

issue

1

eissn

8756-3282

issn

1873-2763

pii

S8756-3282(09)01270-8

journal_volume

45

pub_type

杂志文章

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