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An epidermal stem cells niche microenvironment created by engineered human amniotic membrane

Paper ID Volume ID Publish Year Pages File Format Full-Text
7185 540 2011 11 PDF Available
Title
An epidermal stem cells niche microenvironment created by engineered human amniotic membrane
Abstract

How to amplify epidermal stem cells (ESCs) rapidly is a challenging crux in skin tissue engineering research. The present study describes the preparation of 3D micronized (300–600 μm) amniotic membrane (mAM) by means of repeated freeze-thawing cycles to deplete cell components and homogenized with a macrohomogenizer in liquid nitrogen. This newly prepared mAM not only possessed the characteristics of a microcarrier but completely retained the basement membrane structure and abundant active substances such as NGF, HGF, KGF, bFGF, TGF-β1 and EGF in the AM matrix. The result showed that mAM combined with rotary cell culture system (RCCS) was able to amplify ESCs quickly. The relative cell viability at day 7 and 14 was significantly higher than that of the conventional 2D plate culture (326 ± 28% and 535 ± 47% versus 232 ± 21% and 307 ± 32%, P < 0.05). In addition, the new method was able to prevent cell differentiation effectively and retain the characteristics of stem cells. When mAM loaded with ESCs (ESC-mAM) was further transplanted to full-thickness skin defects in nude mice, ESCs survived well and formed a new epidermis. Four weeks after transplantation, papilla-like structures were observed, and collagen fibers were well and regularly arranged in the newly formed dermal layer. In conclusion, the mAM as a novel natural microcarrier possesses an intact basement membrane structure and bioactivities. It not only provides the microenvironment similar to the stem cell niche within the human body favorable for ex vivo culture and amplification of ESCs but can be used as the dermal scaffold in constructing a skin substitute containing ESCs for the repair of full-thickness skin defects.

Keywords
Microcarriers; Amniotic membrane; Epidermal stem cells; Expansion; Skin substitutes
First Page Preview
An epidermal stem cells niche microenvironment created by engineered human amniotic membrane
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 32, Issue 31, November 2011, Pages 7801–7811
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering