Document Detail

Three-dimensional-engineered matrix to study cancer stem cells and tumorsphere formation: effect of matrix modulus.
MedLine Citation:
PMID:  23013450     Owner:  NLM     Status:  MEDLINE    
Maintenance of cancer stem cells (CSCs) is regulated by the tumor microenvironment. Synthetic hydrogels provide the flexibility to design three-dimensional (3D) matrices to isolate and study individual factors in the tumor microenvironment. The objective of this work was to investigate the effect of matrix modulus on tumorsphere formation by breast cancer cells and maintenance of CSCs in an inert microenvironment without the interference of other factors. In that regard, 4T1 mouse breast cancer cells were encapsulated in inert polyethylene glycol diacrylate hydrogels and the effect of matrix modulus on tumorsphere formation and expression of CSC markers was investigated. The gel modulus had a strong effect on tumorsphere formation and the effect was bimodal. Tumorsphere formation and expression of CSC markers peaked after 8 days of culture. At day 8, as the matrix modulus was increased from 2.5 kPa to 5.3, 26.1, and 47.1 kPa, the average tumorsphere size changed from 37±6 μm to 57±6, 20±4, and 12±2 μm, respectively; cell number density in the gel changed from 0.8±0.1×10⁵ cells/mL to 1.7±0.2×10⁵, 0.4±0.1×10⁵, and 0.2±0.1×10⁵ cells/mL after initial encapsulation of 0.14×10⁵ cells/mL; and the expression of CD44 breast CSC marker changed from 17±4-fold to 38±9-, 3±1-, and 2±1-fold increase compared with the initial level. Similar results were obtained with MCF7 human breast carcinoma cells. Mouse 4T1 and human MCF7 cells encapsulated in the gel with 5.3 kPa modulus formed the largest tumorspheres and highest density of tumorspheres, and had highest expression of breast CSC markers CD44 and ABCG2. The inert polyethylene glycol hydrogel can be used as a model-engineered 3D matrix to study the role of individual factors in the tumor microenvironment on tumorigenesis and maintenance of CSCs without the interference of other factors.
Xiaoming Yang; Samaneh K Sarvestani; Seyedsina Moeinzadeh; Xuezhong He; Esmaiel Jabbari
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-11-07
Journal Detail:
Title:  Tissue engineering. Part A     Volume:  19     ISSN:  1937-335X     ISO Abbreviation:  Tissue Eng Part A     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-02-04     Completed Date:  2013-09-25     Revised Date:  2014-03-09    
Medline Journal Info:
Nlm Unique ID:  101466659     Medline TA:  Tissue Eng Part A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  669-84     Citation Subset:  IM    
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MeSH Terms
Antigens, CD44 / metabolism
Bromodeoxyuridine / metabolism
Cell Count
Cell Size
Elastic Modulus* / drug effects
Extracellular Matrix / drug effects,  metabolism*
Hydrogel / pharmacology
Neoplastic Stem Cells / drug effects,  metabolism,  pathology*
Polyethylene Glycols / pharmacology
Spheroids, Cellular / drug effects,  metabolism,  pathology*
Tissue Engineering / methods*
Tumor Cells, Cultured
Tumor Markers, Biological / metabolism
Grant Support
Reg. No./Substance:
0/Antigens, CD44; 0/Polyethylene Glycols; 0/Tumor Markers, Biological; 25852-47-5/Hydrogel; G34N38R2N1/Bromodeoxyuridine

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