Document Detail


Cross-linking affects cellular condensation and chondrogenesis in type II collagen-GAG scaffolds seeded with bone marrow-derived mesenchymal stem cells.
MedLine Citation:
PMID:  20225321     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The formation of cartilaginous tissue by chondroprogenitor cells, whether in vivo or in vitro, appears to require a critical initial stage of "condensation" in which intercellular space is reduced through an aggregation of cells, leading to development of cell-to-cell junctions followed by chondrocytic differentiation. The objective of this study was to investigate the association of aggregation (condensation) of mesenchymal stem cell (MSCs) and chondrogenesis in vitro. Previous work with chondrocytes indicated that the cross-link density and related cell-mediated contraction of collagen scaffolds significantly affects cartilaginous tissue formation within the cell-seeded construct. Based on this finding, we hypothesized that the cell-aggregating effect of the contraction of MSC-seeded collagen scaffolds of lower cross-link density favors chondrogenesis; scaffolds of higher cross-link density, which resist cell-mediated contraction, would demonstrate a lower cell number density (i.e., subcritical packing density) and less cartilage formation. Type II collagen-GAG scaffolds, chemically cross-linked to achieve a range of cross-link densities, were seeded with caprine MSCs and cultured for 4 weeks. Constructs with low cross-link densities experienced cell-mediated contraction, increased cell number densities, and a greater degree of chondrogenesis (indicated by the chondrocytic morphology of cells, and synthesis of GAG and type II collagen) compared to more highly cross-linked scaffolds that resisted cellular contraction. These results provide a foundation for further investigation of the mechanisms by which condensation of mesenchymal cells induces chondrogenesis in this in vitro model, and may inform cross-linking protocols for collagen scaffolds for use in cartilage tissue engineering.
Authors:
Scott M Vickers; Tobias Gotterbarm; Myron Spector
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of orthopaedic research : official publication of the Orthopaedic Research Society     Volume:  28     ISSN:  1554-527X     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-07-26     Completed Date:  2010-08-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1184-92     Citation Subset:  IM    
Copyright Information:
(c) 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Bone Marrow Cells / cytology,  physiology
Cartilage / cytology,  physiology*
Cell Count
Chondrogenesis / physiology*
Collagen Type II / metabolism*
Cross-Linking Reagents / metabolism*
DNA / metabolism
Female
Glycosaminoglycans / metabolism
Goats
Ilium / cytology
Immunohistochemistry
Mesenchymal Stem Cells / cytology,  physiology*
Organ Culture Techniques / methods
Tissue Engineering / methods*
Chemical
Reg. No./Substance:
0/Collagen Type II; 0/Cross-Linking Reagents; 0/Glycosaminoglycans; 9007-49-2/DNA

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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