RRC ID 45225
Author Maeda E, Tsutsumi T, Kitamura N, Kurokawa T, Ping Gong J, Yasuda K, Ohashi T.
Title Significant increase in Young's modulus of ATDC5 cells during chondrogenic differentiation induced by PAMPS/PDMAAm double-network gel: comparison with induction by insulin.
Journal J Biomech
Abstract A double-network (DN) gel, which was composed of poly(2-acrylamido-2-methylpropanesulfonic acid) and poly(N,N'-dimethyl acrylamide) (PAMPS/PDMAAm), has the potential to induce chondrogenesis both in vitro and in vivo. The present study investigated the biomechanical and biological responses of chondrogenic progenitor ATDC5 cells cultured on the DN gel. ATDC5 cells were cultured on a polystyrene surface without insulin (Culture 1) and with insulin (Culture 2), and on the DN gel without insulin (Culture 3). The cultured cells were evaluated using micropipette aspiration for cell Young's modulus and qPCR for gene expression of chondrogenic and actin organization markers on days 3, 7 and 14. On day 3, the cells in Culture 3 formed nodules, in which the cells exhibited an actin cortical layer inside them, and gene expression of type-II collagen, aggrecan, and SOX9 was significantly higher in Culture 3 than Cultures 1 and 2 (p<0.05). Young's modulus in Culture 3 was significantly higher than that in Culture 1 throughout the testing period (p<0.05) and that in Culture 2 on day 14 (p<0.01). There was continuous expression of actin organization markers in Culture 3. This study highlights that the cells on the DN gel increased the modulus and mRNA expression of chondrogenic markers at an earlier time point with a greater magnitude compared to those on the polystyrene surface with insulin. This study also demonstrates a possible strong interrelation among alteration of cell mechanical properties, changes in actin organization and the induction of chondrogenic differentiation.
Volume 47(13)
Pages 3408-14
Published 2014-10-17
DOI 10.1016/j.jbiomech.2014.07.021
PII S0021-9290(14)00402-3
PMID 25110167
MeSH Acrylamides / chemistry* Actin Cytoskeleton / drug effects Actin Cytoskeleton / metabolism Biomarkers / metabolism Cell Differentiation / drug effects* Cell Line, Tumor Chondrocytes / cytology Chondrocytes / drug effects Chondrogenesis / drug effects* Elastic Modulus / drug effects* Gels Gene Expression Regulation / drug effects Humans Insulin / pharmacology* Polymers / chemistry* Polymers / pharmacology* RNA, Messenger / genetics RNA, Messenger / metabolism Sulfonic Acids / chemistry* Sulfonic Acids / pharmacology*
IF 2.576
Times Cited 3
Human and Animal Cells